[8118303] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // kernel.c -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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[75f3522] | 10 | // Created On : Tue Jan 17 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[0190480] | 12 | // Last Modified On : Mon Aug 31 07:08:20 2020 |
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| 13 | // Update Count : 71 |
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[8118303] | 14 | // |
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| 15 | |
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[2026bb6] | 16 | #define __cforall_thread__ |
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[43784ac] | 17 | #define _GNU_SOURCE |
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| 18 | |
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[4069faad] | 19 | // #define __CFA_DEBUG_PRINT_RUNTIME_CORE__ |
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[2026bb6] | 20 | |
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[8118303] | 21 | //C Includes |
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[214e8da] | 22 | #include <errno.h> |
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[9d944b2] | 23 | #include <stdio.h> |
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[445f984] | 24 | #include <string.h> |
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[58b6d1b] | 25 | #include <signal.h> |
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[9d944b2] | 26 | #include <unistd.h> |
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[dddb3dd0] | 27 | extern "C" { |
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| 28 | #include <sys/eventfd.h> |
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| 29 | } |
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[8118303] | 30 | |
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| 31 | //CFA Includes |
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[73abe95] | 32 | #include "kernel_private.hfa" |
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| 33 | #include "preemption.hfa" |
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[445f984] | 34 | #include "strstream.hfa" |
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| 35 | #include "device/cpu.hfa" |
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[8118303] | 36 | |
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| 37 | //Private includes |
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| 38 | #define __CFA_INVOKE_PRIVATE__ |
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| 39 | #include "invoke.h" |
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| 40 | |
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[89eff25] | 41 | #if !defined(__CFA_NO_STATISTICS__) |
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| 42 | #define __STATS( ...) __VA_ARGS__ |
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| 43 | #else |
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| 44 | #define __STATS( ...) |
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| 45 | #endif |
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[4069faad] | 46 | |
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[deca0f5] | 47 | //----------------------------------------------------------------------------- |
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| 48 | // Some assembly required |
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[1805b1b] | 49 | #if defined( __i386 ) |
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[deca0f5] | 50 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 51 | // fcw : X87 FPU control word (preserved across function calls) |
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| 52 | #define __x87_store \ |
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| 53 | uint32_t __mxcr; \ |
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| 54 | uint16_t __fcw; \ |
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| 55 | __asm__ volatile ( \ |
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| 56 | "stmxcsr %0\n" \ |
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| 57 | "fnstcw %1\n" \ |
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| 58 | : "=m" (__mxcr),\ |
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| 59 | "=m" (__fcw) \ |
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| 60 | ) |
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| 61 | |
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| 62 | #define __x87_load \ |
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| 63 | __asm__ volatile ( \ |
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| 64 | "fldcw %1\n" \ |
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| 65 | "ldmxcsr %0\n" \ |
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| 66 | ::"m" (__mxcr),\ |
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| 67 | "m" (__fcw) \ |
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| 68 | ) |
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| 69 | |
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| 70 | #elif defined( __x86_64 ) |
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| 71 | #define __x87_store \ |
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| 72 | uint32_t __mxcr; \ |
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| 73 | uint16_t __fcw; \ |
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| 74 | __asm__ volatile ( \ |
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| 75 | "stmxcsr %0\n" \ |
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| 76 | "fnstcw %1\n" \ |
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| 77 | : "=m" (__mxcr),\ |
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| 78 | "=m" (__fcw) \ |
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| 79 | ) |
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| 80 | |
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| 81 | #define __x87_load \ |
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| 82 | __asm__ volatile ( \ |
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| 83 | "fldcw %1\n" \ |
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| 84 | "ldmxcsr %0\n" \ |
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| 85 | :: "m" (__mxcr),\ |
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| 86 | "m" (__fcw) \ |
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| 87 | ) |
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| 88 | |
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[0190480] | 89 | #elif defined( __arm__ ) |
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| 90 | #define __x87_store |
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| 91 | #define __x87_load |
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| 92 | |
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| 93 | #elif defined( __aarch64__ ) |
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[74f5c83] | 94 | #define __x87_store \ |
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| 95 | uint32_t __fpcntl[2]; \ |
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| 96 | __asm__ volatile ( \ |
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| 97 | "mrs x9, FPCR\n" \ |
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| 98 | "mrs x10, FPSR\n" \ |
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| 99 | "stp x9, x10, %0\n" \ |
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| 100 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 101 | ) |
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| 102 | |
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| 103 | #define __x87_load \ |
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| 104 | __asm__ volatile ( \ |
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| 105 | "ldp x9, x10, %0\n" \ |
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| 106 | "msr FPSR, x10\n" \ |
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| 107 | "msr FPCR, x9\n" \ |
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| 108 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 109 | ) |
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| 110 | |
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[deca0f5] | 111 | #else |
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[0190480] | 112 | #error unsupported hardware architecture |
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[deca0f5] | 113 | #endif |
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| 114 | |
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[e84ab3d] | 115 | extern thread$ * mainThread; |
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[e660761] | 116 | extern processor * mainProcessor; |
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[2ac095d] | 117 | |
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[92e7631] | 118 | //----------------------------------------------------------------------------- |
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| 119 | // Kernel Scheduling logic |
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[e84ab3d] | 120 | static thread$ * __next_thread(cluster * this); |
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| 121 | static thread$ * __next_thread_slow(cluster * this); |
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| 122 | static inline bool __must_unpark( thread$ * thrd ) __attribute((nonnull(1))); |
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| 123 | static void __run_thread(processor * this, thread$ * dst); |
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[e873838] | 124 | static void __wake_one(cluster * cltr); |
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[1eb239e4] | 125 | |
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[6a9b12b] | 126 | static void mark_idle (__cluster_proc_list & idles, processor & proc); |
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| 127 | static void mark_awake(__cluster_proc_list & idles, processor & proc); |
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| 128 | static [unsigned idle, unsigned total, * processor] query_idles( & __cluster_proc_list idles ); |
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[1eb239e4] | 129 | |
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[dddb3dd0] | 130 | extern void __cfa_io_start( processor * ); |
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[c1c95b1] | 131 | extern bool __cfa_io_drain( processor * ); |
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[dddb3dd0] | 132 | extern void __cfa_io_flush( processor * ); |
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| 133 | extern void __cfa_io_stop ( processor * ); |
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[c1c95b1] | 134 | static inline bool __maybe_io_drain( processor * ); |
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[dddb3dd0] | 135 | |
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| 136 | extern void __disable_interrupts_hard(); |
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| 137 | extern void __enable_interrupts_hard(); |
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[c84e80a] | 138 | |
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[a3821fa] | 139 | static inline void __disable_interrupts_checked() { |
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| 140 | /* paranoid */ verify( __preemption_enabled() ); |
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| 141 | disable_interrupts(); |
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| 142 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 143 | } |
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| 144 | |
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| 145 | static inline void __enable_interrupts_checked( bool poll = true ) { |
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| 146 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 147 | enable_interrupts( poll ); |
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| 148 | /* paranoid */ verify( __preemption_enabled() ); |
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| 149 | } |
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| 150 | |
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[75f3522] | 151 | //============================================================================================= |
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| 152 | // Kernel Scheduling logic |
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| 153 | //============================================================================================= |
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[8fcbb4c] | 154 | //Main of the processor contexts |
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[83a071f9] | 155 | void main(processorCtx_t & runner) { |
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[21184e3] | 156 | // Because of a bug, we couldn't initialized the seed on construction |
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| 157 | // Do it here |
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[8fc652e0] | 158 | __cfaabi_tls.rand_seed ^= rdtscl(); |
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| 159 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner); |
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[f2384c9a] | 160 | __tls_rand_advance_bck(); |
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[21184e3] | 161 | |
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[83a071f9] | 162 | processor * this = runner.proc; |
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[094476d] | 163 | verify(this); |
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[c81ebf9] | 164 | |
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[dddb3dd0] | 165 | __cfa_io_start( this ); |
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| 166 | |
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[4069faad] | 167 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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[28d73c1] | 168 | #if !defined(__CFA_NO_STATISTICS__) |
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| 169 | if( this->print_halts ) { |
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[c993b15] | 170 | __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->unique_id, this->name, (void*)this); |
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[28d73c1] | 171 | } |
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| 172 | #endif |
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[b798713] | 173 | |
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[75f3522] | 174 | { |
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[c81ebf9] | 175 | // Setup preemption data |
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| 176 | preemption_scope scope = { this }; |
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| 177 | |
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[a5e7233] | 178 | // if we need to run some special setup, now is the time to do it. |
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| 179 | if(this->init.thrd) { |
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| 180 | this->init.thrd->curr_cluster = this->cltr; |
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| 181 | __run_thread(this, this->init.thrd); |
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| 182 | } |
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[325e6ea] | 183 | |
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[4069faad] | 184 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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[8118303] | 185 | |
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[e84ab3d] | 186 | thread$ * readyThread = 0p; |
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[1eb239e4] | 187 | MAIN_LOOP: |
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| 188 | for() { |
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[57f70ab] | 189 | #define OLD_MAIN 1 |
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| 190 | #if OLD_MAIN |
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[dddb3dd0] | 191 | // Check if there is pending io |
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| 192 | __maybe_io_drain( this ); |
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| 193 | |
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[92e7631] | 194 | // Try to get the next thread |
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[8c50aed] | 195 | readyThread = __next_thread( this->cltr ); |
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[75f3522] | 196 | |
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[1eb239e4] | 197 | if( !readyThread ) { |
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[dddb3dd0] | 198 | __cfa_io_flush( this ); |
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[1eb239e4] | 199 | readyThread = __next_thread_slow( this->cltr ); |
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| 200 | } |
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[4e6fb8e] | 201 | |
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[1eb239e4] | 202 | HALT: |
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| 203 | if( !readyThread ) { |
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| 204 | // Don't block if we are done |
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| 205 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[c81ebf9] | 206 | |
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[1eb239e4] | 207 | #if !defined(__CFA_NO_STATISTICS__) |
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| 208 | __tls_stats()->ready.sleep.halts++; |
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| 209 | #endif |
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[398e8e9] | 210 | |
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[1eb239e4] | 211 | // Push self to idle stack |
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[6a9b12b] | 212 | mark_idle(this->cltr->procs, * this); |
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[398e8e9] | 213 | |
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[1eb239e4] | 214 | // Confirm the ready-queue is empty |
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| 215 | readyThread = __next_thread_slow( this->cltr ); |
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| 216 | if( readyThread ) { |
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| 217 | // A thread was found, cancel the halt |
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[6a9b12b] | 218 | mark_awake(this->cltr->procs, * this); |
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[1eb239e4] | 219 | |
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| 220 | #if !defined(__CFA_NO_STATISTICS__) |
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| 221 | __tls_stats()->ready.sleep.cancels++; |
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| 222 | #endif |
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| 223 | |
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| 224 | // continue the mai loop |
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| 225 | break HALT; |
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| 226 | } |
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| 227 | |
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| 228 | #if !defined(__CFA_NO_STATISTICS__) |
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| 229 | if(this->print_halts) { |
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[c993b15] | 230 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->unique_id, rdtscl()); |
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[1eb239e4] | 231 | } |
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| 232 | #endif |
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| 233 | |
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[dddb3dd0] | 234 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle); |
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| 235 | |
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[56e5b24] | 236 | { |
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| 237 | eventfd_t val; |
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| 238 | ssize_t ret = read( this->idle, &val, sizeof(val) ); |
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| 239 | if(ret < 0) { |
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| 240 | switch((int)errno) { |
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| 241 | case EAGAIN: |
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| 242 | #if EAGAIN != EWOULDBLOCK |
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| 243 | case EWOULDBLOCK: |
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| 244 | #endif |
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| 245 | case EINTR: |
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| 246 | // No need to do anything special here, just assume it's a legitimate wake-up |
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| 247 | break; |
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| 248 | default: |
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| 249 | abort( "KERNEL : internal error, read failure on idle eventfd, error(%d) %s.", (int)errno, strerror( (int)errno ) ); |
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| 250 | } |
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| 251 | } |
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| 252 | } |
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[1eb239e4] | 253 | |
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| 254 | #if !defined(__CFA_NO_STATISTICS__) |
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| 255 | if(this->print_halts) { |
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[c993b15] | 256 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->unique_id, rdtscl()); |
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[1eb239e4] | 257 | } |
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| 258 | #endif |
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| 259 | |
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| 260 | // We were woken up, remove self from idle |
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[6a9b12b] | 261 | mark_awake(this->cltr->procs, * this); |
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[1eb239e4] | 262 | |
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| 263 | // DON'T just proceed, start looking again |
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| 264 | continue MAIN_LOOP; |
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[64a7146] | 265 | } |
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[1eb239e4] | 266 | |
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| 267 | /* paranoid */ verify( readyThread ); |
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| 268 | |
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[dddb3dd0] | 269 | // Reset io dirty bit |
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| 270 | this->io.dirty = false; |
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| 271 | |
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[1eb239e4] | 272 | // We found a thread run it |
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| 273 | __run_thread(this, readyThread); |
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| 274 | |
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| 275 | // Are we done? |
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| 276 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[325e6ea] | 277 | |
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[dddb3dd0] | 278 | if(this->io.pending && !this->io.dirty) { |
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| 279 | __cfa_io_flush( this ); |
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| 280 | } |
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[89eff25] | 281 | |
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[34b2796] | 282 | #else |
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[57f70ab] | 283 | #warning new kernel loop |
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[34b2796] | 284 | SEARCH: { |
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| 285 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 286 | |
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| 287 | // First, lock the scheduler since we are searching for a thread |
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| 288 | ready_schedule_lock(); |
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| 289 | |
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| 290 | // Try to get the next thread |
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| 291 | readyThread = pop_fast( this->cltr ); |
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| 292 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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| 293 | |
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| 294 | // If we can't find a thread, might as well flush any outstanding I/O |
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| 295 | if(this->io.pending) { __cfa_io_flush( this ); } |
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| 296 | |
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| 297 | // Spin a little on I/O, just in case |
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[12daa43] | 298 | for(5) { |
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[34b2796] | 299 | __maybe_io_drain( this ); |
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| 300 | readyThread = pop_fast( this->cltr ); |
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| 301 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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| 302 | } |
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| 303 | |
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| 304 | // no luck, try stealing a few times |
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[12daa43] | 305 | for(5) { |
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[34b2796] | 306 | if( __maybe_io_drain( this ) ) { |
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| 307 | readyThread = pop_fast( this->cltr ); |
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| 308 | } else { |
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| 309 | readyThread = pop_slow( this->cltr ); |
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| 310 | } |
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| 311 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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| 312 | } |
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| 313 | |
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| 314 | // still no luck, search for a thread |
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| 315 | readyThread = pop_search( this->cltr ); |
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| 316 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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| 317 | |
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| 318 | // Don't block if we are done |
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| 319 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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| 320 | |
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| 321 | __STATS( __tls_stats()->ready.sleep.halts++; ) |
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| 322 | |
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| 323 | // Push self to idle stack |
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| 324 | ready_schedule_unlock(); |
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| 325 | mark_idle(this->cltr->procs, * this); |
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| 326 | ready_schedule_lock(); |
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| 327 | |
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| 328 | // Confirm the ready-queue is empty |
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| 329 | __maybe_io_drain( this ); |
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| 330 | readyThread = pop_search( this->cltr ); |
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| 331 | ready_schedule_unlock(); |
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| 332 | |
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| 333 | if( readyThread ) { |
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| 334 | // A thread was found, cancel the halt |
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| 335 | mark_awake(this->cltr->procs, * this); |
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| 336 | |
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| 337 | __STATS( __tls_stats()->ready.sleep.cancels++; ) |
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| 338 | |
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| 339 | // continue the main loop |
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| 340 | break SEARCH; |
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| 341 | } |
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| 342 | |
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[abcae55] | 343 | __STATS( if(this->print_halts) __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->unique_id, rdtscl()); ) |
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[34b2796] | 344 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle); |
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| 345 | |
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[ec421636] | 346 | { |
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| 347 | eventfd_t val; |
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| 348 | ssize_t ret = read( this->idle, &val, sizeof(val) ); |
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| 349 | if(ret < 0) { |
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| 350 | switch((int)errno) { |
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| 351 | case EAGAIN: |
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| 352 | #if EAGAIN != EWOULDBLOCK |
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| 353 | case EWOULDBLOCK: |
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| 354 | #endif |
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| 355 | case EINTR: |
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| 356 | // No need to do anything special here, just assume it's a legitimate wake-up |
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| 357 | break; |
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| 358 | default: |
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| 359 | abort( "KERNEL : internal error, read failure on idle eventfd, error(%d) %s.", (int)errno, strerror( (int)errno ) ); |
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| 360 | } |
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| 361 | } |
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| 362 | } |
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[34b2796] | 363 | |
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[fb4ccdf] | 364 | __STATS( if(this->print_halts) __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->unique_id, rdtscl()); ) |
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[34b2796] | 365 | |
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| 366 | // We were woken up, remove self from idle |
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| 367 | mark_awake(this->cltr->procs, * this); |
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| 368 | |
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| 369 | // DON'T just proceed, start looking again |
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| 370 | continue MAIN_LOOP; |
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| 371 | } |
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| 372 | |
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| 373 | RUN_THREAD: |
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| 374 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 375 | /* paranoid */ verify( readyThread ); |
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| 376 | |
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| 377 | // Reset io dirty bit |
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| 378 | this->io.dirty = false; |
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| 379 | |
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| 380 | // We found a thread run it |
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| 381 | __run_thread(this, readyThread); |
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| 382 | |
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| 383 | // Are we done? |
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| 384 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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| 385 | |
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| 386 | if(this->io.pending && !this->io.dirty) { |
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| 387 | __cfa_io_flush( this ); |
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| 388 | } |
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| 389 | |
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| 390 | ready_schedule_lock(); |
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| 391 | __maybe_io_drain( this ); |
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| 392 | ready_schedule_unlock(); |
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| 393 | #endif |
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[c81ebf9] | 394 | } |
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| 395 | |
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[4069faad] | 396 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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[c84e80a] | 397 | } |
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[8118303] | 398 | |
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[dddb3dd0] | 399 | __cfa_io_stop( this ); |
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| 400 | |
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[454f478] | 401 | post( this->terminated ); |
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[bdeba0b] | 402 | |
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[28d73c1] | 403 | if(this == mainProcessor) { |
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[6a490b2] | 404 | // HACK : the coroutine context switch expects this_thread to be set |
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| 405 | // and it make sense for it to be set in all other cases except here |
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| 406 | // fake it |
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[8fc652e0] | 407 | __cfaabi_tls.this_thread = mainThread; |
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[6a490b2] | 408 | } |
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[7768b8d] | 409 | |
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[4069faad] | 410 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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[c84e80a] | 411 | } |
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| 412 | |
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[5c1a531] | 413 | static int * __volatile_errno() __attribute__((noinline)); |
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| 414 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 415 | |
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[14a61b5] | 416 | // KERNEL ONLY |
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[1c273d0] | 417 | // runThread runs a thread by context switching |
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| 418 | // from the processor coroutine to the target thread |
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[e84ab3d] | 419 | static void __run_thread(processor * this, thread$ * thrd_dst) { |
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[8fc652e0] | 420 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[1eb239e4] | 421 | /* paranoid */ verifyf( thrd_dst->state == Ready || thrd_dst->preempted != __NO_PREEMPTION, "state : %d, preempted %d\n", thrd_dst->state, thrd_dst->preempted); |
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| 422 | /* paranoid */ verifyf( thrd_dst->link.next == 0p, "Expected null got %p", thrd_dst->link.next ); |
---|
| 423 | __builtin_prefetch( thrd_dst->context.SP ); |
---|
| 424 | |
---|
[dddb3dd0] | 425 | __cfadbg_print_safe(runtime_core, "Kernel : core %p running thread %p (%s)\n", this, thrd_dst, thrd_dst->self_cor.name); |
---|
| 426 | |
---|
[e84ab3d] | 427 | coroutine$ * proc_cor = get_coroutine(this->runner); |
---|
[8fcbb4c] | 428 | |
---|
[9f575ea] | 429 | // set state of processor coroutine to inactive |
---|
| 430 | verify(proc_cor->state == Active); |
---|
[ae7be7a] | 431 | proc_cor->state = Blocked; |
---|
[e8e457e] | 432 | |
---|
[9f575ea] | 433 | // Actually run the thread |
---|
[3381ed7] | 434 | RUNNING: while(true) { |
---|
[ff79d5e] | 435 | thrd_dst->preempted = __NO_PREEMPTION; |
---|
| 436 | thrd_dst->state = Active; |
---|
[e8e457e] | 437 | |
---|
[58d64a4] | 438 | // Update global state |
---|
[8fc652e0] | 439 | kernelTLS().this_thread = thrd_dst; |
---|
[75f3522] | 440 | |
---|
[8fc652e0] | 441 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 442 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
---|
[9d6e1b8a] | 443 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
---|
[b4b63e8] | 444 | /* paranoid */ verify( thrd_dst->context.SP ); |
---|
[5afb49a] | 445 | /* paranoid */ verify( thrd_dst->state != Halted ); |
---|
[e84ab3d] | 446 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); // add escape condition if we are setting up the processor |
---|
| 447 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); // add escape condition if we are setting up the processor |
---|
[ac12f1f] | 448 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
---|
[b4b63e8] | 449 | |
---|
[3381ed7] | 450 | |
---|
[58d64a4] | 451 | |
---|
[9f575ea] | 452 | // set context switch to the thread that the processor is executing |
---|
[c7a900a] | 453 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
---|
| 454 | // when __cfactx_switch returns we are back in the processor coroutine |
---|
[9f575ea] | 455 | |
---|
[50871b4] | 456 | |
---|
| 457 | |
---|
[ac12f1f] | 458 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
---|
[e84ab3d] | 459 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); |
---|
| 460 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); |
---|
[b4b63e8] | 461 | /* paranoid */ verify( thrd_dst->context.SP ); |
---|
[9d6e1b8a] | 462 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
---|
[8fc652e0] | 463 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
---|
| 464 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[75f3522] | 465 | |
---|
[58d64a4] | 466 | // Reset global state |
---|
[8fc652e0] | 467 | kernelTLS().this_thread = 0p; |
---|
[3381ed7] | 468 | |
---|
| 469 | // We just finished running a thread, there are a few things that could have happened. |
---|
| 470 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
---|
| 471 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
---|
| 472 | // 4 - Preempted |
---|
| 473 | // In case 1, we may have won a race so we can't write to the state again. |
---|
| 474 | // In case 2, we lost the race so we now own the thread. |
---|
| 475 | |
---|
| 476 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
---|
| 477 | // The thread was preempted, reschedule it and reset the flag |
---|
[254ad1b] | 478 | schedule_thread$( thrd_dst ); |
---|
[3381ed7] | 479 | break RUNNING; |
---|
| 480 | } |
---|
[75f3522] | 481 | |
---|
[3ea8ad1] | 482 | if(unlikely(thrd_dst->state == Halting)) { |
---|
[ff79d5e] | 483 | // The thread has halted, it should never be scheduled/run again |
---|
[5afb49a] | 484 | // finish the thread |
---|
| 485 | __thread_finish( thrd_dst ); |
---|
[ff79d5e] | 486 | break RUNNING; |
---|
| 487 | } |
---|
| 488 | |
---|
| 489 | /* paranoid */ verify( thrd_dst->state == Active ); |
---|
| 490 | thrd_dst->state = Blocked; |
---|
| 491 | |
---|
[3381ed7] | 492 | // set state of processor coroutine to active and the thread to inactive |
---|
[ff79d5e] | 493 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 494 | switch(old_ticket) { |
---|
[6a77224] | 495 | case TICKET_RUNNING: |
---|
[3381ed7] | 496 | // This is case 1, the regular case, nothing more is needed |
---|
| 497 | break RUNNING; |
---|
[6a77224] | 498 | case TICKET_UNBLOCK: |
---|
[ec43cf9] | 499 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 500 | __tls_stats()->ready.threads.threads++; |
---|
| 501 | #endif |
---|
[3381ed7] | 502 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
---|
| 503 | // In this case, just run it again. |
---|
| 504 | continue RUNNING; |
---|
| 505 | default: |
---|
| 506 | // This makes no sense, something is wrong abort |
---|
[ff79d5e] | 507 | abort(); |
---|
[3381ed7] | 508 | } |
---|
[9f575ea] | 509 | } |
---|
[e8e457e] | 510 | |
---|
[9f575ea] | 511 | // Just before returning to the processor, set the processor coroutine to active |
---|
[e8e457e] | 512 | proc_cor->state = Active; |
---|
[1eb239e4] | 513 | |
---|
[dddb3dd0] | 514 | __cfadbg_print_safe(runtime_core, "Kernel : core %p finished running thread %p\n", this, thrd_dst); |
---|
| 515 | |
---|
[ec43cf9] | 516 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 517 | __tls_stats()->ready.threads.threads--; |
---|
| 518 | #endif |
---|
| 519 | |
---|
[8fc652e0] | 520 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[82c948c] | 521 | } |
---|
| 522 | |
---|
[14a61b5] | 523 | // KERNEL_ONLY |
---|
[b0c7419] | 524 | void returnToKernel() { |
---|
[8fc652e0] | 525 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e84ab3d] | 526 | coroutine$ * proc_cor = get_coroutine(kernelTLS().this_processor->runner); |
---|
| 527 | thread$ * thrd_src = kernelTLS().this_thread; |
---|
[e8e457e] | 528 | |
---|
[89eff25] | 529 | __STATS( thrd_src->last_proc = kernelTLS().this_processor; ) |
---|
[29cb302] | 530 | |
---|
[9f575ea] | 531 | // Run the thread on this processor |
---|
| 532 | { |
---|
| 533 | int local_errno = *__volatile_errno(); |
---|
| 534 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 535 | __x87_store; |
---|
| 536 | #endif |
---|
[b4b63e8] | 537 | /* paranoid */ verify( proc_cor->context.SP ); |
---|
[ac12f1f] | 538 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[c7a900a] | 539 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
---|
[ac12f1f] | 540 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[9f575ea] | 541 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 542 | __x87_load; |
---|
| 543 | #endif |
---|
| 544 | *__volatile_errno() = local_errno; |
---|
[8fcbb4c] | 545 | } |
---|
[deca0f5] | 546 | |
---|
[29cb302] | 547 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[89eff25] | 548 | /* paranoid */ verify( thrd_src->last_proc != 0p ); |
---|
| 549 | if(thrd_src->last_proc != kernelTLS().this_processor) { |
---|
[29cb302] | 550 | __tls_stats()->ready.threads.migration++; |
---|
| 551 | } |
---|
| 552 | #endif |
---|
| 553 | |
---|
[8fc652e0] | 554 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e84ab3d] | 555 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ) || thrd_src->corctx_flag, "ERROR : Returning thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_src ); |
---|
| 556 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit) || thrd_src->corctx_flag, "ERROR : Returning thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_src ); |
---|
[c84e80a] | 557 | } |
---|
| 558 | |
---|
[8def349] | 559 | //----------------------------------------------------------------------------- |
---|
| 560 | // Scheduler routines |
---|
[14a61b5] | 561 | // KERNEL ONLY |
---|
[e84ab3d] | 562 | static void __schedule_thread( thread$ * thrd ) { |
---|
[8fc652e0] | 563 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[254ad1b] | 564 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
[6a490b2] | 565 | /* paranoid */ verify( thrd ); |
---|
| 566 | /* paranoid */ verify( thrd->state != Halted ); |
---|
[9d6e1b8a] | 567 | /* paranoid */ verify( thrd->curr_cluster ); |
---|
[3381ed7] | 568 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
[504a7dc] | 569 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
| 570 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[ff79d5e] | 571 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
[504a7dc] | 572 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[3381ed7] | 573 | /* paranoid */ #endif |
---|
[6a490b2] | 574 | /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next ); |
---|
[ac12f1f] | 575 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
[b4b63e8] | 576 | |
---|
[b808625] | 577 | const bool local = thrd->state != Start; |
---|
[ae7be7a] | 578 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
[6b4cdd3] | 579 | |
---|
[ec43cf9] | 580 | // Dereference the thread now because once we push it, there is not guaranteed it's still valid. |
---|
| 581 | struct cluster * cl = thrd->curr_cluster; |
---|
[89eff25] | 582 | __STATS(bool outside = thrd->last_proc && thrd->last_proc != kernelTLS().this_processor; ) |
---|
[32a8b61] | 583 | |
---|
[254ad1b] | 584 | // push the thread to the cluster ready-queue |
---|
[b808625] | 585 | push( cl, thrd, local ); |
---|
[32a8b61] | 586 | |
---|
[254ad1b] | 587 | // variable thrd is no longer safe to use |
---|
[734908c] | 588 | thrd = 0xdeaddeaddeaddeadp; |
---|
[32a8b61] | 589 | |
---|
[254ad1b] | 590 | // wake the cluster using the save variable. |
---|
| 591 | __wake_one( cl ); |
---|
[1c273d0] | 592 | |
---|
[ec43cf9] | 593 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 594 | if( kernelTLS().this_stats ) { |
---|
| 595 | __tls_stats()->ready.threads.threads++; |
---|
[89eff25] | 596 | if(outside) { |
---|
| 597 | __tls_stats()->ready.threads.extunpark++; |
---|
| 598 | } |
---|
[ec43cf9] | 599 | } |
---|
| 600 | else { |
---|
| 601 | __atomic_fetch_add(&cl->stats->ready.threads.threads, 1, __ATOMIC_RELAXED); |
---|
[89eff25] | 602 | __atomic_fetch_add(&cl->stats->ready.threads.extunpark, 1, __ATOMIC_RELAXED); |
---|
[ec43cf9] | 603 | } |
---|
| 604 | #endif |
---|
| 605 | |
---|
[254ad1b] | 606 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
[8fc652e0] | 607 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[db6f06a] | 608 | } |
---|
| 609 | |
---|
[e84ab3d] | 610 | void schedule_thread$( thread$ * thrd ) { |
---|
[254ad1b] | 611 | ready_schedule_lock(); |
---|
| 612 | __schedule_thread( thrd ); |
---|
| 613 | ready_schedule_unlock(); |
---|
| 614 | } |
---|
| 615 | |
---|
[14a61b5] | 616 | // KERNEL ONLY |
---|
[e84ab3d] | 617 | static inline thread$ * __next_thread(cluster * this) with( *this ) { |
---|
[8fc652e0] | 618 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[7768b8d] | 619 | |
---|
[e873838] | 620 | ready_schedule_lock(); |
---|
[e84ab3d] | 621 | thread$ * thrd = pop_fast( this ); |
---|
[e873838] | 622 | ready_schedule_unlock(); |
---|
[7768b8d] | 623 | |
---|
[8fc652e0] | 624 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 625 | return thrd; |
---|
[eb2e723] | 626 | } |
---|
| 627 | |
---|
[64a7146] | 628 | // KERNEL ONLY |
---|
[e84ab3d] | 629 | static inline thread$ * __next_thread_slow(cluster * this) with( *this ) { |
---|
[8fc652e0] | 630 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[64a7146] | 631 | |
---|
[e873838] | 632 | ready_schedule_lock(); |
---|
[e84ab3d] | 633 | thread$ * thrd; |
---|
[fc59df78] | 634 | for(25) { |
---|
| 635 | thrd = pop_slow( this ); |
---|
| 636 | if(thrd) goto RET; |
---|
| 637 | } |
---|
| 638 | thrd = pop_search( this ); |
---|
| 639 | |
---|
| 640 | RET: |
---|
[e873838] | 641 | ready_schedule_unlock(); |
---|
[64a7146] | 642 | |
---|
[8fc652e0] | 643 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 644 | return thrd; |
---|
[64a7146] | 645 | } |
---|
| 646 | |
---|
[e84ab3d] | 647 | static inline bool __must_unpark( thread$ * thrd ) { |
---|
[ff79d5e] | 648 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 649 | switch(old_ticket) { |
---|
[6a77224] | 650 | case TICKET_RUNNING: |
---|
[3381ed7] | 651 | // Wake won the race, the thread will reschedule/rerun itself |
---|
[c6c7e6c] | 652 | return false; |
---|
[6a77224] | 653 | case TICKET_BLOCKED: |
---|
[3381ed7] | 654 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
[ff79d5e] | 655 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
[c6c7e6c] | 656 | return true; |
---|
[3381ed7] | 657 | default: |
---|
| 658 | // This makes no sense, something is wrong abort |
---|
[7ee8153] | 659 | abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name); |
---|
[de6319f] | 660 | } |
---|
[eb2e723] | 661 | } |
---|
| 662 | |
---|
[e84ab3d] | 663 | void __kernel_unpark( thread$ * thrd ) { |
---|
[e9c0b4c] | 664 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 665 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
| 666 | |
---|
| 667 | if( !thrd ) return; |
---|
| 668 | |
---|
| 669 | if(__must_unpark(thrd)) { |
---|
| 670 | // Wake lost the race, |
---|
| 671 | __schedule_thread( thrd ); |
---|
| 672 | } |
---|
| 673 | |
---|
| 674 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
| 675 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 676 | } |
---|
| 677 | |
---|
[e84ab3d] | 678 | void unpark( thread$ * thrd ) { |
---|
[c6c7e6c] | 679 | if( !thrd ) return; |
---|
[0b33412] | 680 | |
---|
[c6c7e6c] | 681 | if(__must_unpark(thrd)) { |
---|
| 682 | disable_interrupts(); |
---|
[a3821fa] | 683 | // Wake lost the race, |
---|
[254ad1b] | 684 | schedule_thread$( thrd ); |
---|
[a3821fa] | 685 | enable_interrupts(false); |
---|
[de6319f] | 686 | } |
---|
[eb2e723] | 687 | } |
---|
[0b33412] | 688 | |
---|
[e235429] | 689 | void park( void ) { |
---|
[a3821fa] | 690 | __disable_interrupts_checked(); |
---|
| 691 | /* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION ); |
---|
| 692 | returnToKernel(); |
---|
| 693 | __enable_interrupts_checked(); |
---|
[0c78741] | 694 | |
---|
| 695 | } |
---|
[09800e9] | 696 | |
---|
[5afb49a] | 697 | extern "C" { |
---|
| 698 | // Leave the thread monitor |
---|
| 699 | // last routine called by a thread. |
---|
| 700 | // Should never return |
---|
| 701 | void __cfactx_thrd_leave() { |
---|
[e84ab3d] | 702 | thread$ * thrd = active_thread(); |
---|
| 703 | monitor$ * this = &thrd->self_mon; |
---|
[5afb49a] | 704 | |
---|
| 705 | // Lock the monitor now |
---|
| 706 | lock( this->lock __cfaabi_dbg_ctx2 ); |
---|
| 707 | |
---|
| 708 | disable_interrupts(); |
---|
| 709 | |
---|
[9d6e1b8a] | 710 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 711 | /* paranoid */ verify( thrd->state == Active ); |
---|
| 712 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
| 713 | /* paranoid */ verify( kernelTLS().this_thread == thrd ); |
---|
| 714 | /* paranoid */ verify( thrd->context.SP ); |
---|
[e84ab3d] | 715 | /* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) > ((uintptr_t)__get_stack(thrd->curr_cor)->limit), "ERROR : thread$ %p has been corrupted.\n StackPointer too large.\n", thrd ); |
---|
| 716 | /* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) < ((uintptr_t)__get_stack(thrd->curr_cor)->base ), "ERROR : thread$ %p has been corrupted.\n StackPointer too small.\n", thrd ); |
---|
[9d6e1b8a] | 717 | |
---|
[3ea8ad1] | 718 | thrd->state = Halting; |
---|
[58688bf] | 719 | if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); } |
---|
[9d6e1b8a] | 720 | if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); } |
---|
| 721 | if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); } |
---|
[5afb49a] | 722 | |
---|
| 723 | // Leave the thread |
---|
| 724 | returnToKernel(); |
---|
| 725 | |
---|
| 726 | // Control flow should never reach here! |
---|
[9d6e1b8a] | 727 | abort(); |
---|
[5afb49a] | 728 | } |
---|
[09800e9] | 729 | } |
---|
| 730 | |
---|
[14a61b5] | 731 | // KERNEL ONLY |
---|
[3381ed7] | 732 | bool force_yield( __Preemption_Reason reason ) { |
---|
[a3821fa] | 733 | __disable_interrupts_checked(); |
---|
[e84ab3d] | 734 | thread$ * thrd = kernelTLS().this_thread; |
---|
[a3821fa] | 735 | /* paranoid */ verify(thrd->state == Active); |
---|
| 736 | |
---|
| 737 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
| 738 | // it was going to park itself. If that is the case and it is already using the |
---|
| 739 | // intrusive fields then we can't use them to preempt the thread |
---|
| 740 | // If that is the case, abandon the preemption. |
---|
| 741 | bool preempted = false; |
---|
| 742 | if(thrd->link.next == 0p) { |
---|
| 743 | preempted = true; |
---|
| 744 | thrd->preempted = reason; |
---|
| 745 | returnToKernel(); |
---|
| 746 | } |
---|
| 747 | __enable_interrupts_checked( false ); |
---|
[3381ed7] | 748 | return preempted; |
---|
[f2b12406] | 749 | } |
---|
| 750 | |
---|
[14a61b5] | 751 | //============================================================================================= |
---|
[92e7631] | 752 | // Kernel Idle Sleep |
---|
[14a61b5] | 753 | //============================================================================================= |
---|
[64a7146] | 754 | // Wake a thread from the front if there are any |
---|
[e873838] | 755 | static void __wake_one(cluster * this) { |
---|
[8fc652e0] | 756 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e873838] | 757 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[14a61b5] | 758 | |
---|
[64a7146] | 759 | // Check if there is a sleeping processor |
---|
[1eb239e4] | 760 | processor * p; |
---|
| 761 | unsigned idle; |
---|
| 762 | unsigned total; |
---|
[6a9b12b] | 763 | [idle, total, p] = query_idles(this->procs); |
---|
[14a61b5] | 764 | |
---|
[64a7146] | 765 | // If no one is sleeping, we are done |
---|
[1eb239e4] | 766 | if( idle == 0 ) return; |
---|
[14a61b5] | 767 | |
---|
[64a7146] | 768 | // We found a processor, wake it up |
---|
[dddb3dd0] | 769 | eventfd_t val; |
---|
| 770 | val = 1; |
---|
| 771 | eventfd_write( p->idle, val ); |
---|
[14a61b5] | 772 | |
---|
[1eb239e4] | 773 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[5cb51502] | 774 | if( kernelTLS().this_stats ) { |
---|
| 775 | __tls_stats()->ready.sleep.wakes++; |
---|
| 776 | } |
---|
| 777 | else { |
---|
| 778 | __atomic_fetch_add(&this->stats->ready.sleep.wakes, 1, __ATOMIC_RELAXED); |
---|
| 779 | } |
---|
[1eb239e4] | 780 | #endif |
---|
| 781 | |
---|
[e873838] | 782 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[8fc652e0] | 783 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 784 | |
---|
| 785 | return; |
---|
[64a7146] | 786 | } |
---|
[14a61b5] | 787 | |
---|
[64a7146] | 788 | // Unconditionnaly wake a thread |
---|
[1eb239e4] | 789 | void __wake_proc(processor * this) { |
---|
[64a7146] | 790 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
[14a61b5] | 791 | |
---|
[a3821fa] | 792 | __disable_interrupts_checked(); |
---|
[8fc652e0] | 793 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[dddb3dd0] | 794 | eventfd_t val; |
---|
| 795 | val = 1; |
---|
[55d6affb] | 796 | eventfd_write( this->idle, val ); |
---|
[a3821fa] | 797 | __enable_interrupts_checked(); |
---|
[92e7631] | 798 | } |
---|
| 799 | |
---|
[6a9b12b] | 800 | static void mark_idle(__cluster_proc_list & this, processor & proc) { |
---|
[8fc652e0] | 801 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 802 | lock( this ); |
---|
| 803 | this.idle++; |
---|
| 804 | /* paranoid */ verify( this.idle <= this.total ); |
---|
[fc59b580] | 805 | remove(proc); |
---|
[6a9b12b] | 806 | insert_first(this.idles, proc); |
---|
[1eb239e4] | 807 | unlock( this ); |
---|
[8fc652e0] | 808 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 809 | } |
---|
[8e16177] | 810 | |
---|
[6a9b12b] | 811 | static void mark_awake(__cluster_proc_list & this, processor & proc) { |
---|
[8fc652e0] | 812 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 813 | lock( this ); |
---|
| 814 | this.idle--; |
---|
| 815 | /* paranoid */ verify( this.idle >= 0 ); |
---|
| 816 | remove(proc); |
---|
[fc59b580] | 817 | insert_last(this.actives, proc); |
---|
[1eb239e4] | 818 | unlock( this ); |
---|
[8fc652e0] | 819 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 820 | } |
---|
[c34ebf2] | 821 | |
---|
[6a9b12b] | 822 | static [unsigned idle, unsigned total, * processor] query_idles( & __cluster_proc_list this ) { |
---|
| 823 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 824 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
| 825 | |
---|
[1eb239e4] | 826 | for() { |
---|
| 827 | uint64_t l = __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST); |
---|
| 828 | if( 1 == (l % 2) ) { Pause(); continue; } |
---|
| 829 | unsigned idle = this.idle; |
---|
| 830 | unsigned total = this.total; |
---|
[6a9b12b] | 831 | processor * proc = &this.idles`first; |
---|
[7fdae38] | 832 | // Compiler fence is unnecessary, but gcc-8 and older incorrectly reorder code without it |
---|
| 833 | asm volatile("": : :"memory"); |
---|
[1eb239e4] | 834 | if(l != __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST)) { Pause(); continue; } |
---|
| 835 | return [idle, total, proc]; |
---|
| 836 | } |
---|
[6a9b12b] | 837 | |
---|
| 838 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
| 839 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[6b4cdd3] | 840 | } |
---|
| 841 | |
---|
[dbe9b08] | 842 | //============================================================================================= |
---|
| 843 | // Unexpected Terminating logic |
---|
| 844 | //============================================================================================= |
---|
[92bfda0] | 845 | void __kernel_abort_msg( char * abort_text, int abort_text_size ) { |
---|
[e84ab3d] | 846 | thread$ * thrd = __cfaabi_tls.this_thread; |
---|
[9d944b2] | 847 | |
---|
[de94a60] | 848 | if(thrd) { |
---|
| 849 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[1c40091] | 850 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 851 | |
---|
[212c2187] | 852 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 853 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[1c40091] | 854 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 855 | } |
---|
| 856 | else { |
---|
[1c40091] | 857 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
[de94a60] | 858 | } |
---|
[1c273d0] | 859 | } |
---|
[9d944b2] | 860 | else { |
---|
[de94a60] | 861 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[1c40091] | 862 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[9d944b2] | 863 | } |
---|
| 864 | } |
---|
| 865 | |
---|
[92bfda0] | 866 | int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 867 | return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 868 | } |
---|
| 869 | |
---|
[de94a60] | 870 | static __spinlock_t kernel_debug_lock; |
---|
| 871 | |
---|
[9d944b2] | 872 | extern "C" { |
---|
[1c40091] | 873 | void __cfaabi_bits_acquire() { |
---|
[36982fc] | 874 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 875 | } |
---|
| 876 | |
---|
[1c40091] | 877 | void __cfaabi_bits_release() { |
---|
[ea7d2b0] | 878 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 879 | } |
---|
[8118303] | 880 | } |
---|
| 881 | |
---|
[fa21ac9] | 882 | //============================================================================================= |
---|
| 883 | // Kernel Utilities |
---|
| 884 | //============================================================================================= |
---|
[dddb3dd0] | 885 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 886 | #include "io/types.hfa" |
---|
| 887 | #endif |
---|
| 888 | |
---|
[c1c95b1] | 889 | static inline bool __maybe_io_drain( processor * proc ) { |
---|
[e9c0b4c] | 890 | bool ret = false; |
---|
[dddb3dd0] | 891 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 892 | __cfadbg_print_safe(runtime_core, "Kernel : core %p checking io for ring %d\n", proc, proc->io.ctx->fd); |
---|
| 893 | |
---|
| 894 | // Check if we should drain the queue |
---|
| 895 | $io_context * ctx = proc->io.ctx; |
---|
| 896 | unsigned head = *ctx->cq.head; |
---|
| 897 | unsigned tail = *ctx->cq.tail; |
---|
[c1c95b1] | 898 | if(head == tail) return false; |
---|
[57f70ab] | 899 | #if OLD_MAIN |
---|
[b7fd2db6] | 900 | ready_schedule_lock(); |
---|
[e9c0b4c] | 901 | ret = __cfa_io_drain( proc ); |
---|
[b7fd2db6] | 902 | ready_schedule_unlock(); |
---|
[57f70ab] | 903 | #else |
---|
| 904 | ret = __cfa_io_drain( proc ); |
---|
| 905 | #endif |
---|
[dddb3dd0] | 906 | #endif |
---|
[e9c0b4c] | 907 | return ret; |
---|
[dddb3dd0] | 908 | } |
---|
| 909 | |
---|
[de94a60] | 910 | //----------------------------------------------------------------------------- |
---|
| 911 | // Debug |
---|
| 912 | __cfaabi_dbg_debug_do( |
---|
[1997b4e] | 913 | extern "C" { |
---|
[ae66348] | 914 | void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) { |
---|
[1997b4e] | 915 | this.prev_name = prev_name; |
---|
[8fc652e0] | 916 | this.prev_thrd = kernelTLS().this_thread; |
---|
[1997b4e] | 917 | } |
---|
[9181f1d] | 918 | } |
---|
[f7d6bb0] | 919 | ) |
---|
[2026bb6] | 920 | |
---|
| 921 | //----------------------------------------------------------------------------- |
---|
| 922 | // Debug |
---|
[8c50aed] | 923 | bool threading_enabled(void) __attribute__((const)) { |
---|
[2026bb6] | 924 | return true; |
---|
| 925 | } |
---|
[c34ebf2] | 926 | |
---|
| 927 | //----------------------------------------------------------------------------- |
---|
| 928 | // Statistics |
---|
| 929 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 930 | void print_halts( processor & this ) { |
---|
| 931 | this.print_halts = true; |
---|
| 932 | } |
---|
[58688bf] | 933 | |
---|
[69914cbc] | 934 | static void crawl_list( cluster * cltr, dlist(processor) & list, unsigned count ) { |
---|
[8464edf] | 935 | /* paranoid */ verify( cltr->stats ); |
---|
| 936 | |
---|
| 937 | processor * it = &list`first; |
---|
| 938 | for(unsigned i = 0; i < count; i++) { |
---|
| 939 | /* paranoid */ verifyf( it, "Unexpected null iterator, at index %u of %u\n", i, count); |
---|
| 940 | /* paranoid */ verify( it->local_data->this_stats ); |
---|
| 941 | __tally_stats( cltr->stats, it->local_data->this_stats ); |
---|
| 942 | it = &(*it)`next; |
---|
| 943 | } |
---|
| 944 | } |
---|
| 945 | |
---|
| 946 | void crawl_cluster_stats( cluster & this ) { |
---|
| 947 | // Stop the world, otherwise stats could get really messed-up |
---|
| 948 | // this doesn't solve all problems but does solve many |
---|
| 949 | // so it's probably good enough |
---|
| 950 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
| 951 | |
---|
| 952 | crawl_list(&this, this.procs.actives, this.procs.total - this.procs.idle); |
---|
| 953 | crawl_list(&this, this.procs.idles , this.procs.idle ); |
---|
| 954 | |
---|
| 955 | // Unlock the RWlock |
---|
| 956 | ready_mutate_unlock( last_size ); |
---|
| 957 | } |
---|
| 958 | |
---|
| 959 | |
---|
[58688bf] | 960 | void print_stats_now( cluster & this, int flags ) { |
---|
[8464edf] | 961 | crawl_cluster_stats( this ); |
---|
[1b033b8] | 962 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
---|
| 963 | } |
---|
[c34ebf2] | 964 | #endif |
---|
[8118303] | 965 | // Local Variables: // |
---|
| 966 | // mode: c // |
---|
| 967 | // tab-width: 4 // |
---|
| 968 | // End: // |
---|