[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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[d3605f8] | 29 | #include <sys/uio.h> |
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[dddb3dd0] | 30 | } |
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[8118303] | 31 | |
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| 32 | //CFA Includes |
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[73abe95] | 33 | #include "kernel_private.hfa" |
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| 34 | #include "preemption.hfa" |
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[445f984] | 35 | #include "strstream.hfa" |
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| 36 | #include "device/cpu.hfa" |
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[7ef162b2] | 37 | #include "io/types.hfa" |
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[8118303] | 38 | |
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| 39 | //Private includes |
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| 40 | #define __CFA_INVOKE_PRIVATE__ |
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| 41 | #include "invoke.h" |
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| 42 | |
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[89eff25] | 43 | #if !defined(__CFA_NO_STATISTICS__) |
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[c9c1c1c] | 44 | #define __STATS_DEF( ...) __VA_ARGS__ |
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[89eff25] | 45 | #else |
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[c9c1c1c] | 46 | #define __STATS_DEF( ...) |
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[89eff25] | 47 | #endif |
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[4069faad] | 48 | |
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[deca0f5] | 49 | //----------------------------------------------------------------------------- |
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| 50 | // Some assembly required |
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[1805b1b] | 51 | #if defined( __i386 ) |
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[deca0f5] | 52 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 53 | // fcw : X87 FPU control word (preserved across function calls) |
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| 54 | #define __x87_store \ |
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| 55 | uint32_t __mxcr; \ |
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| 56 | uint16_t __fcw; \ |
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| 57 | __asm__ volatile ( \ |
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| 58 | "stmxcsr %0\n" \ |
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| 59 | "fnstcw %1\n" \ |
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| 60 | : "=m" (__mxcr),\ |
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| 61 | "=m" (__fcw) \ |
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| 62 | ) |
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| 63 | |
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| 64 | #define __x87_load \ |
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| 65 | __asm__ volatile ( \ |
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| 66 | "fldcw %1\n" \ |
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| 67 | "ldmxcsr %0\n" \ |
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| 68 | ::"m" (__mxcr),\ |
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| 69 | "m" (__fcw) \ |
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| 70 | ) |
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| 71 | |
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| 72 | #elif defined( __x86_64 ) |
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| 73 | #define __x87_store \ |
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| 74 | uint32_t __mxcr; \ |
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| 75 | uint16_t __fcw; \ |
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| 76 | __asm__ volatile ( \ |
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| 77 | "stmxcsr %0\n" \ |
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| 78 | "fnstcw %1\n" \ |
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| 79 | : "=m" (__mxcr),\ |
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| 80 | "=m" (__fcw) \ |
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| 81 | ) |
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| 82 | |
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| 83 | #define __x87_load \ |
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| 84 | __asm__ volatile ( \ |
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| 85 | "fldcw %1\n" \ |
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| 86 | "ldmxcsr %0\n" \ |
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| 87 | :: "m" (__mxcr),\ |
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| 88 | "m" (__fcw) \ |
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| 89 | ) |
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| 90 | |
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[0190480] | 91 | #elif defined( __arm__ ) |
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| 92 | #define __x87_store |
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| 93 | #define __x87_load |
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| 94 | |
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| 95 | #elif defined( __aarch64__ ) |
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[74f5c83] | 96 | #define __x87_store \ |
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| 97 | uint32_t __fpcntl[2]; \ |
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| 98 | __asm__ volatile ( \ |
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| 99 | "mrs x9, FPCR\n" \ |
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| 100 | "mrs x10, FPSR\n" \ |
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| 101 | "stp x9, x10, %0\n" \ |
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| 102 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 103 | ) |
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| 104 | |
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| 105 | #define __x87_load \ |
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| 106 | __asm__ volatile ( \ |
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| 107 | "ldp x9, x10, %0\n" \ |
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| 108 | "msr FPSR, x10\n" \ |
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| 109 | "msr FPCR, x9\n" \ |
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| 110 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 111 | ) |
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| 112 | |
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[deca0f5] | 113 | #else |
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[0190480] | 114 | #error unsupported hardware architecture |
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[deca0f5] | 115 | #endif |
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| 116 | |
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[e84ab3d] | 117 | extern thread$ * mainThread; |
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[e660761] | 118 | extern processor * mainProcessor; |
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[2ac095d] | 119 | |
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[92e7631] | 120 | //----------------------------------------------------------------------------- |
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| 121 | // Kernel Scheduling logic |
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[e84ab3d] | 122 | static thread$ * __next_thread(cluster * this); |
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| 123 | static thread$ * __next_thread_slow(cluster * this); |
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[c9c1c1c] | 124 | static thread$ * __next_thread_search(cluster * this); |
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[e84ab3d] | 125 | static inline bool __must_unpark( thread$ * thrd ) __attribute((nonnull(1))); |
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| 126 | static void __run_thread(processor * this, thread$ * dst); |
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[e873838] | 127 | static void __wake_one(cluster * cltr); |
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[1eb239e4] | 128 | |
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[d3605f8] | 129 | static void idle_sleep(processor * proc, io_future_t & future, iovec & iov); |
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[5f5a729] | 130 | static bool mark_idle (__cluster_proc_list & idles, processor & proc); |
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[6a9b12b] | 131 | static void mark_awake(__cluster_proc_list & idles, processor & proc); |
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[1eb239e4] | 132 | |
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[dddb3dd0] | 133 | extern void __cfa_io_start( processor * ); |
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[c1c95b1] | 134 | extern bool __cfa_io_drain( processor * ); |
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[c7b2215] | 135 | extern bool __cfa_io_flush( processor *, int min_comp ); |
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[dddb3dd0] | 136 | extern void __cfa_io_stop ( processor * ); |
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[c1c95b1] | 137 | static inline bool __maybe_io_drain( processor * ); |
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[dddb3dd0] | 138 | |
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[d3605f8] | 139 | #if defined(CFA_WITH_IO_URING_IDLE) |
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| 140 | extern bool __kernel_read(processor * proc, io_future_t & future, iovec &, int fd); |
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[6ddef36] | 141 | #endif |
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[7ef162b2] | 142 | |
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[dddb3dd0] | 143 | extern void __disable_interrupts_hard(); |
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| 144 | extern void __enable_interrupts_hard(); |
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[c84e80a] | 145 | |
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[7ef162b2] | 146 | |
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[75f3522] | 147 | //============================================================================================= |
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| 148 | // Kernel Scheduling logic |
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| 149 | //============================================================================================= |
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[8fcbb4c] | 150 | //Main of the processor contexts |
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[83a071f9] | 151 | void main(processorCtx_t & runner) { |
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[21184e3] | 152 | // Because of a bug, we couldn't initialized the seed on construction |
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| 153 | // Do it here |
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[8fc652e0] | 154 | __cfaabi_tls.rand_seed ^= rdtscl(); |
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| 155 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner); |
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[f2384c9a] | 156 | __tls_rand_advance_bck(); |
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[21184e3] | 157 | |
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[83a071f9] | 158 | processor * this = runner.proc; |
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[094476d] | 159 | verify(this); |
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[c81ebf9] | 160 | |
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[7ef162b2] | 161 | io_future_t future; // used for idle sleep when io_uring is present |
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| 162 | future.self.ptr = 1p; // mark it as already fulfilled so we know if there is a pending request or not |
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[c7b2215] | 163 | eventfd_t idle_val; |
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[d3605f8] | 164 | iovec idle_iovec = { &idle_val, sizeof(idle_val) }; |
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[7ef162b2] | 165 | |
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[dddb3dd0] | 166 | __cfa_io_start( this ); |
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| 167 | |
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[4069faad] | 168 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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[28d73c1] | 169 | #if !defined(__CFA_NO_STATISTICS__) |
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| 170 | if( this->print_halts ) { |
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[c993b15] | 171 | __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->unique_id, this->name, (void*)this); |
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[28d73c1] | 172 | } |
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| 173 | #endif |
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[b798713] | 174 | |
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[75f3522] | 175 | { |
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[c81ebf9] | 176 | // Setup preemption data |
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| 177 | preemption_scope scope = { this }; |
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| 178 | |
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[a5e7233] | 179 | // if we need to run some special setup, now is the time to do it. |
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| 180 | if(this->init.thrd) { |
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| 181 | this->init.thrd->curr_cluster = this->cltr; |
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| 182 | __run_thread(this, this->init.thrd); |
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| 183 | } |
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[325e6ea] | 184 | |
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[4069faad] | 185 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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[8118303] | 186 | |
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[e84ab3d] | 187 | thread$ * readyThread = 0p; |
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[1eb239e4] | 188 | MAIN_LOOP: |
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| 189 | for() { |
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[dddb3dd0] | 190 | // Check if there is pending io |
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| 191 | __maybe_io_drain( this ); |
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| 192 | |
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[92e7631] | 193 | // Try to get the next thread |
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[8c50aed] | 194 | readyThread = __next_thread( this->cltr ); |
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[75f3522] | 195 | |
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[1eb239e4] | 196 | if( !readyThread ) { |
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[c9c1c1c] | 197 | __IO_STATS__(true, io.flush.idle++; ) |
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[c7b2215] | 198 | __cfa_io_flush( this, 0 ); |
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[c33c2af] | 199 | |
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[c9c1c1c] | 200 | readyThread = __next_thread( this->cltr ); |
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| 201 | } |
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| 202 | |
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| 203 | if( !readyThread ) for(5) { |
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| 204 | __IO_STATS__(true, io.flush.idle++; ) |
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| 205 | |
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[1eb239e4] | 206 | readyThread = __next_thread_slow( this->cltr ); |
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[c9c1c1c] | 207 | |
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| 208 | if( readyThread ) break; |
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| 209 | |
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| 210 | __cfa_io_flush( this, 0 ); |
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[1eb239e4] | 211 | } |
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[4e6fb8e] | 212 | |
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[1eb239e4] | 213 | HALT: |
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| 214 | if( !readyThread ) { |
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| 215 | // Don't block if we are done |
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| 216 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[c81ebf9] | 217 | |
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[1eb239e4] | 218 | // Push self to idle stack |
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[5f5a729] | 219 | if(!mark_idle(this->cltr->procs, * this)) continue MAIN_LOOP; |
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[398e8e9] | 220 | |
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[1eb239e4] | 221 | // Confirm the ready-queue is empty |
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[c9c1c1c] | 222 | readyThread = __next_thread_search( this->cltr ); |
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[1eb239e4] | 223 | if( readyThread ) { |
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| 224 | // A thread was found, cancel the halt |
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[6a9b12b] | 225 | mark_awake(this->cltr->procs, * this); |
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[1eb239e4] | 226 | |
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[c9c1c1c] | 227 | __STATS__(true, ready.sleep.cancels++; ) |
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[1eb239e4] | 228 | |
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| 229 | // continue the mai loop |
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| 230 | break HALT; |
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| 231 | } |
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| 232 | |
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[d3605f8] | 233 | idle_sleep( this, future, idle_iovec ); |
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[1eb239e4] | 234 | |
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| 235 | // We were woken up, remove self from idle |
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[6a9b12b] | 236 | mark_awake(this->cltr->procs, * this); |
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[1eb239e4] | 237 | |
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| 238 | // DON'T just proceed, start looking again |
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| 239 | continue MAIN_LOOP; |
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[64a7146] | 240 | } |
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[1eb239e4] | 241 | |
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| 242 | /* paranoid */ verify( readyThread ); |
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| 243 | |
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[dddb3dd0] | 244 | // Reset io dirty bit |
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| 245 | this->io.dirty = false; |
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| 246 | |
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[1eb239e4] | 247 | // We found a thread run it |
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| 248 | __run_thread(this, readyThread); |
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| 249 | |
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| 250 | // Are we done? |
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| 251 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[325e6ea] | 252 | |
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[dddb3dd0] | 253 | if(this->io.pending && !this->io.dirty) { |
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[c9c1c1c] | 254 | __IO_STATS__(true, io.flush.dirty++; ) |
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[c7b2215] | 255 | __cfa_io_flush( this, 0 ); |
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[dddb3dd0] | 256 | } |
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[c81ebf9] | 257 | } |
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| 258 | |
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[4069faad] | 259 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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[c84e80a] | 260 | } |
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[8118303] | 261 | |
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[3bb4f85] | 262 | for(int i = 0; !available(future); i++) { |
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| 263 | if(i > 1000) __cfaabi_dbg_write( "ERROR: kernel has bin spinning on a flush after exit loop.\n", 60); |
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| 264 | __cfa_io_flush( this, 1 ); |
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| 265 | } |
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| 266 | |
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[dddb3dd0] | 267 | __cfa_io_stop( this ); |
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| 268 | |
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[454f478] | 269 | post( this->terminated ); |
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[bdeba0b] | 270 | |
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[28d73c1] | 271 | if(this == mainProcessor) { |
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[6a490b2] | 272 | // HACK : the coroutine context switch expects this_thread to be set |
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| 273 | // and it make sense for it to be set in all other cases except here |
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| 274 | // fake it |
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[8fc652e0] | 275 | __cfaabi_tls.this_thread = mainThread; |
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[6a490b2] | 276 | } |
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[7768b8d] | 277 | |
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[4069faad] | 278 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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[c84e80a] | 279 | } |
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| 280 | |
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[5c1a531] | 281 | static int * __volatile_errno() __attribute__((noinline)); |
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| 282 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 283 | |
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[14a61b5] | 284 | // KERNEL ONLY |
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[1c273d0] | 285 | // runThread runs a thread by context switching |
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| 286 | // from the processor coroutine to the target thread |
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[e84ab3d] | 287 | static void __run_thread(processor * this, thread$ * thrd_dst) { |
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[8fc652e0] | 288 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[1eb239e4] | 289 | /* 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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| 290 | /* paranoid */ verifyf( thrd_dst->link.next == 0p, "Expected null got %p", thrd_dst->link.next ); |
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| 291 | __builtin_prefetch( thrd_dst->context.SP ); |
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| 292 | |
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[dddb3dd0] | 293 | __cfadbg_print_safe(runtime_core, "Kernel : core %p running thread %p (%s)\n", this, thrd_dst, thrd_dst->self_cor.name); |
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| 294 | |
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[e84ab3d] | 295 | coroutine$ * proc_cor = get_coroutine(this->runner); |
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[8fcbb4c] | 296 | |
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[9f575ea] | 297 | // set state of processor coroutine to inactive |
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| 298 | verify(proc_cor->state == Active); |
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[ae7be7a] | 299 | proc_cor->state = Blocked; |
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[e8e457e] | 300 | |
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[9f575ea] | 301 | // Actually run the thread |
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[3381ed7] | 302 | RUNNING: while(true) { |
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[ff79d5e] | 303 | thrd_dst->preempted = __NO_PREEMPTION; |
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| 304 | thrd_dst->state = Active; |
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[e8e457e] | 305 | |
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[58d64a4] | 306 | // Update global state |
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[8fc652e0] | 307 | kernelTLS().this_thread = thrd_dst; |
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[75f3522] | 308 | |
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[8fc652e0] | 309 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 310 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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[9d6e1b8a] | 311 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[b4b63e8] | 312 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[5afb49a] | 313 | /* paranoid */ verify( thrd_dst->state != Halted ); |
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[e84ab3d] | 314 | /* 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 |
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| 315 | /* 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 |
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[ac12f1f] | 316 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[b4b63e8] | 317 | |
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[3381ed7] | 318 | |
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[58d64a4] | 319 | |
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[9f575ea] | 320 | // set context switch to the thread that the processor is executing |
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[c7a900a] | 321 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
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| 322 | // when __cfactx_switch returns we are back in the processor coroutine |
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[9f575ea] | 323 | |
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[50871b4] | 324 | |
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| 325 | |
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[ac12f1f] | 326 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[e84ab3d] | 327 | /* 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 ); |
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| 328 | /* 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 ); |
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[b4b63e8] | 329 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[9d6e1b8a] | 330 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[8fc652e0] | 331 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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| 332 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[75f3522] | 333 | |
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[58d64a4] | 334 | // Reset global state |
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[8fc652e0] | 335 | kernelTLS().this_thread = 0p; |
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[3381ed7] | 336 | |
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| 337 | // We just finished running a thread, there are a few things that could have happened. |
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| 338 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
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| 339 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
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| 340 | // 4 - Preempted |
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| 341 | // In case 1, we may have won a race so we can't write to the state again. |
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| 342 | // In case 2, we lost the race so we now own the thread. |
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| 343 | |
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| 344 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
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| 345 | // The thread was preempted, reschedule it and reset the flag |
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[24e321c] | 346 | schedule_thread$( thrd_dst, UNPARK_LOCAL ); |
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[3381ed7] | 347 | break RUNNING; |
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| 348 | } |
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[75f3522] | 349 | |
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[3ea8ad1] | 350 | if(unlikely(thrd_dst->state == Halting)) { |
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[ff79d5e] | 351 | // The thread has halted, it should never be scheduled/run again |
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[5afb49a] | 352 | // finish the thread |
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| 353 | __thread_finish( thrd_dst ); |
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[ff79d5e] | 354 | break RUNNING; |
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| 355 | } |
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| 356 | |
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| 357 | /* paranoid */ verify( thrd_dst->state == Active ); |
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| 358 | thrd_dst->state = Blocked; |
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| 359 | |
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[3381ed7] | 360 | // set state of processor coroutine to active and the thread to inactive |
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[ff79d5e] | 361 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
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| 362 | switch(old_ticket) { |
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[6a77224] | 363 | case TICKET_RUNNING: |
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[3381ed7] | 364 | // This is case 1, the regular case, nothing more is needed |
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| 365 | break RUNNING; |
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[6a77224] | 366 | case TICKET_UNBLOCK: |
---|
[c9c1c1c] | 367 | __STATS__(true, ready.threads.threads++; ) |
---|
[3381ed7] | 368 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
---|
| 369 | // In this case, just run it again. |
---|
| 370 | continue RUNNING; |
---|
| 371 | default: |
---|
| 372 | // This makes no sense, something is wrong abort |
---|
[ff79d5e] | 373 | abort(); |
---|
[3381ed7] | 374 | } |
---|
[9f575ea] | 375 | } |
---|
[e8e457e] | 376 | |
---|
[9f575ea] | 377 | // Just before returning to the processor, set the processor coroutine to active |
---|
[e8e457e] | 378 | proc_cor->state = Active; |
---|
[1eb239e4] | 379 | |
---|
[dddb3dd0] | 380 | __cfadbg_print_safe(runtime_core, "Kernel : core %p finished running thread %p\n", this, thrd_dst); |
---|
| 381 | |
---|
[c9c1c1c] | 382 | __STATS__(true, ready.threads.threads--; ) |
---|
[ec43cf9] | 383 | |
---|
[8fc652e0] | 384 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[82c948c] | 385 | } |
---|
| 386 | |
---|
[14a61b5] | 387 | // KERNEL_ONLY |
---|
[b0c7419] | 388 | void returnToKernel() { |
---|
[8fc652e0] | 389 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e84ab3d] | 390 | coroutine$ * proc_cor = get_coroutine(kernelTLS().this_processor->runner); |
---|
| 391 | thread$ * thrd_src = kernelTLS().this_thread; |
---|
[e8e457e] | 392 | |
---|
[c9c1c1c] | 393 | __STATS_DEF( thrd_src->last_proc = kernelTLS().this_processor; ) |
---|
[29cb302] | 394 | |
---|
[9f575ea] | 395 | // Run the thread on this processor |
---|
| 396 | { |
---|
| 397 | int local_errno = *__volatile_errno(); |
---|
| 398 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 399 | __x87_store; |
---|
| 400 | #endif |
---|
[b4b63e8] | 401 | /* paranoid */ verify( proc_cor->context.SP ); |
---|
[ac12f1f] | 402 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[c7a900a] | 403 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
---|
[ac12f1f] | 404 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[9f575ea] | 405 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 406 | __x87_load; |
---|
| 407 | #endif |
---|
| 408 | *__volatile_errno() = local_errno; |
---|
[8fcbb4c] | 409 | } |
---|
[deca0f5] | 410 | |
---|
[29cb302] | 411 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[89eff25] | 412 | /* paranoid */ verify( thrd_src->last_proc != 0p ); |
---|
| 413 | if(thrd_src->last_proc != kernelTLS().this_processor) { |
---|
[29cb302] | 414 | __tls_stats()->ready.threads.migration++; |
---|
| 415 | } |
---|
| 416 | #endif |
---|
| 417 | |
---|
[8fc652e0] | 418 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e84ab3d] | 419 | /* 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 ); |
---|
| 420 | /* 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] | 421 | } |
---|
| 422 | |
---|
[8def349] | 423 | //----------------------------------------------------------------------------- |
---|
| 424 | // Scheduler routines |
---|
[14a61b5] | 425 | // KERNEL ONLY |
---|
[24e321c] | 426 | static void __schedule_thread( thread$ * thrd, unpark_hint hint ) { |
---|
[8fc652e0] | 427 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[254ad1b] | 428 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
[6a490b2] | 429 | /* paranoid */ verify( thrd ); |
---|
| 430 | /* paranoid */ verify( thrd->state != Halted ); |
---|
[9d6e1b8a] | 431 | /* paranoid */ verify( thrd->curr_cluster ); |
---|
[3381ed7] | 432 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
[504a7dc] | 433 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
| 434 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[ff79d5e] | 435 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
[504a7dc] | 436 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[3381ed7] | 437 | /* paranoid */ #endif |
---|
[6a490b2] | 438 | /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next ); |
---|
[ac12f1f] | 439 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
[b4b63e8] | 440 | |
---|
[ae7be7a] | 441 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
[6b4cdd3] | 442 | |
---|
[ec43cf9] | 443 | // Dereference the thread now because once we push it, there is not guaranteed it's still valid. |
---|
| 444 | struct cluster * cl = thrd->curr_cluster; |
---|
[c9c1c1c] | 445 | __STATS_DEF(bool outside = hint == UNPARK_LOCAL && thrd->last_proc && thrd->last_proc != kernelTLS().this_processor; ) |
---|
[32a8b61] | 446 | |
---|
[254ad1b] | 447 | // push the thread to the cluster ready-queue |
---|
[24e321c] | 448 | push( cl, thrd, hint ); |
---|
[32a8b61] | 449 | |
---|
[254ad1b] | 450 | // variable thrd is no longer safe to use |
---|
[734908c] | 451 | thrd = 0xdeaddeaddeaddeadp; |
---|
[32a8b61] | 452 | |
---|
[254ad1b] | 453 | // wake the cluster using the save variable. |
---|
| 454 | __wake_one( cl ); |
---|
[1c273d0] | 455 | |
---|
[ec43cf9] | 456 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 457 | if( kernelTLS().this_stats ) { |
---|
| 458 | __tls_stats()->ready.threads.threads++; |
---|
[89eff25] | 459 | if(outside) { |
---|
| 460 | __tls_stats()->ready.threads.extunpark++; |
---|
| 461 | } |
---|
[ec43cf9] | 462 | } |
---|
| 463 | else { |
---|
| 464 | __atomic_fetch_add(&cl->stats->ready.threads.threads, 1, __ATOMIC_RELAXED); |
---|
[89eff25] | 465 | __atomic_fetch_add(&cl->stats->ready.threads.extunpark, 1, __ATOMIC_RELAXED); |
---|
[ec43cf9] | 466 | } |
---|
| 467 | #endif |
---|
| 468 | |
---|
[254ad1b] | 469 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
[8fc652e0] | 470 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[db6f06a] | 471 | } |
---|
| 472 | |
---|
[24e321c] | 473 | void schedule_thread$( thread$ * thrd, unpark_hint hint ) { |
---|
[254ad1b] | 474 | ready_schedule_lock(); |
---|
[24e321c] | 475 | __schedule_thread( thrd, hint ); |
---|
[254ad1b] | 476 | ready_schedule_unlock(); |
---|
| 477 | } |
---|
| 478 | |
---|
[14a61b5] | 479 | // KERNEL ONLY |
---|
[e84ab3d] | 480 | static inline thread$ * __next_thread(cluster * this) with( *this ) { |
---|
[8fc652e0] | 481 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[7768b8d] | 482 | |
---|
[e873838] | 483 | ready_schedule_lock(); |
---|
[e84ab3d] | 484 | thread$ * thrd = pop_fast( this ); |
---|
[e873838] | 485 | ready_schedule_unlock(); |
---|
[7768b8d] | 486 | |
---|
[8fc652e0] | 487 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 488 | return thrd; |
---|
[eb2e723] | 489 | } |
---|
| 490 | |
---|
[64a7146] | 491 | // KERNEL ONLY |
---|
[e84ab3d] | 492 | static inline thread$ * __next_thread_slow(cluster * this) with( *this ) { |
---|
[8fc652e0] | 493 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[64a7146] | 494 | |
---|
[e873838] | 495 | ready_schedule_lock(); |
---|
[c9c1c1c] | 496 | thread$ * thrd = pop_slow( this ); |
---|
| 497 | ready_schedule_unlock(); |
---|
| 498 | |
---|
| 499 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 500 | return thrd; |
---|
| 501 | } |
---|
[fc59df78] | 502 | |
---|
[c9c1c1c] | 503 | // KERNEL ONLY |
---|
| 504 | static inline thread$ * __next_thread_search(cluster * this) with( *this ) { |
---|
| 505 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 506 | |
---|
| 507 | ready_schedule_lock(); |
---|
| 508 | thread$ * thrd = pop_search( this ); |
---|
[e873838] | 509 | ready_schedule_unlock(); |
---|
[64a7146] | 510 | |
---|
[8fc652e0] | 511 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 512 | return thrd; |
---|
[64a7146] | 513 | } |
---|
| 514 | |
---|
[e84ab3d] | 515 | static inline bool __must_unpark( thread$ * thrd ) { |
---|
[ff79d5e] | 516 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 517 | switch(old_ticket) { |
---|
[6a77224] | 518 | case TICKET_RUNNING: |
---|
[3381ed7] | 519 | // Wake won the race, the thread will reschedule/rerun itself |
---|
[c6c7e6c] | 520 | return false; |
---|
[6a77224] | 521 | case TICKET_BLOCKED: |
---|
[3381ed7] | 522 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
[ff79d5e] | 523 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
[c6c7e6c] | 524 | return true; |
---|
[3381ed7] | 525 | default: |
---|
| 526 | // This makes no sense, something is wrong abort |
---|
[7ee8153] | 527 | abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name); |
---|
[de6319f] | 528 | } |
---|
[eb2e723] | 529 | } |
---|
| 530 | |
---|
[24e321c] | 531 | void __kernel_unpark( thread$ * thrd, unpark_hint hint ) { |
---|
[e9c0b4c] | 532 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 533 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
| 534 | |
---|
| 535 | if( !thrd ) return; |
---|
| 536 | |
---|
| 537 | if(__must_unpark(thrd)) { |
---|
| 538 | // Wake lost the race, |
---|
[24e321c] | 539 | __schedule_thread( thrd, hint ); |
---|
[e9c0b4c] | 540 | } |
---|
| 541 | |
---|
| 542 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
| 543 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 544 | } |
---|
| 545 | |
---|
[24e321c] | 546 | void unpark( thread$ * thrd, unpark_hint hint ) { |
---|
[c6c7e6c] | 547 | if( !thrd ) return; |
---|
[0b33412] | 548 | |
---|
[c6c7e6c] | 549 | if(__must_unpark(thrd)) { |
---|
| 550 | disable_interrupts(); |
---|
[a3821fa] | 551 | // Wake lost the race, |
---|
[24e321c] | 552 | schedule_thread$( thrd, hint ); |
---|
[a3821fa] | 553 | enable_interrupts(false); |
---|
[de6319f] | 554 | } |
---|
[eb2e723] | 555 | } |
---|
[0b33412] | 556 | |
---|
[e235429] | 557 | void park( void ) { |
---|
[a3821fa] | 558 | __disable_interrupts_checked(); |
---|
| 559 | /* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION ); |
---|
| 560 | returnToKernel(); |
---|
| 561 | __enable_interrupts_checked(); |
---|
[0c78741] | 562 | |
---|
| 563 | } |
---|
[09800e9] | 564 | |
---|
[5afb49a] | 565 | extern "C" { |
---|
| 566 | // Leave the thread monitor |
---|
| 567 | // last routine called by a thread. |
---|
| 568 | // Should never return |
---|
| 569 | void __cfactx_thrd_leave() { |
---|
[e84ab3d] | 570 | thread$ * thrd = active_thread(); |
---|
| 571 | monitor$ * this = &thrd->self_mon; |
---|
[5afb49a] | 572 | |
---|
| 573 | // Lock the monitor now |
---|
| 574 | lock( this->lock __cfaabi_dbg_ctx2 ); |
---|
| 575 | |
---|
| 576 | disable_interrupts(); |
---|
| 577 | |
---|
[9d6e1b8a] | 578 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 579 | /* paranoid */ verify( thrd->state == Active ); |
---|
| 580 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
| 581 | /* paranoid */ verify( kernelTLS().this_thread == thrd ); |
---|
| 582 | /* paranoid */ verify( thrd->context.SP ); |
---|
[e84ab3d] | 583 | /* 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 ); |
---|
| 584 | /* 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] | 585 | |
---|
[3ea8ad1] | 586 | thrd->state = Halting; |
---|
[58688bf] | 587 | if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); } |
---|
[9d6e1b8a] | 588 | if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); } |
---|
| 589 | if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); } |
---|
[5afb49a] | 590 | |
---|
| 591 | // Leave the thread |
---|
| 592 | returnToKernel(); |
---|
| 593 | |
---|
| 594 | // Control flow should never reach here! |
---|
[9d6e1b8a] | 595 | abort(); |
---|
[5afb49a] | 596 | } |
---|
[09800e9] | 597 | } |
---|
| 598 | |
---|
[14a61b5] | 599 | // KERNEL ONLY |
---|
[3381ed7] | 600 | bool force_yield( __Preemption_Reason reason ) { |
---|
[a3821fa] | 601 | __disable_interrupts_checked(); |
---|
[e84ab3d] | 602 | thread$ * thrd = kernelTLS().this_thread; |
---|
[a3821fa] | 603 | /* paranoid */ verify(thrd->state == Active); |
---|
| 604 | |
---|
| 605 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
| 606 | // it was going to park itself. If that is the case and it is already using the |
---|
| 607 | // intrusive fields then we can't use them to preempt the thread |
---|
| 608 | // If that is the case, abandon the preemption. |
---|
| 609 | bool preempted = false; |
---|
| 610 | if(thrd->link.next == 0p) { |
---|
| 611 | preempted = true; |
---|
| 612 | thrd->preempted = reason; |
---|
| 613 | returnToKernel(); |
---|
| 614 | } |
---|
| 615 | __enable_interrupts_checked( false ); |
---|
[3381ed7] | 616 | return preempted; |
---|
[f2b12406] | 617 | } |
---|
| 618 | |
---|
[14a61b5] | 619 | //============================================================================================= |
---|
[92e7631] | 620 | // Kernel Idle Sleep |
---|
[14a61b5] | 621 | //============================================================================================= |
---|
[64a7146] | 622 | // Wake a thread from the front if there are any |
---|
[e873838] | 623 | static void __wake_one(cluster * this) { |
---|
[7cf3b1d] | 624 | eventfd_t val; |
---|
| 625 | |
---|
[8fc652e0] | 626 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e873838] | 627 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[14a61b5] | 628 | |
---|
[64a7146] | 629 | // Check if there is a sleeping processor |
---|
[7cf3b1d] | 630 | struct __fd_waitctx * fdp = __atomic_load_n(&this->procs.fdw, __ATOMIC_SEQ_CST); |
---|
[14a61b5] | 631 | |
---|
[7cf3b1d] | 632 | // If no one is sleeping: we are done |
---|
| 633 | if( fdp == 0p ) return; |
---|
[14a61b5] | 634 | |
---|
[7cf3b1d] | 635 | int fd = 1; |
---|
| 636 | if( __atomic_load_n(&fdp->fd, __ATOMIC_SEQ_CST) != 1 ) { |
---|
| 637 | fd = __atomic_exchange_n(&fdp->fd, 1, __ATOMIC_RELAXED); |
---|
| 638 | } |
---|
[14a61b5] | 639 | |
---|
[7cf3b1d] | 640 | switch(fd) { |
---|
| 641 | case 0: |
---|
| 642 | // If the processor isn't ready to sleep then the exchange will already wake it up |
---|
| 643 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 644 | if( kernelTLS().this_stats ) { __tls_stats()->ready.sleep.early++; |
---|
| 645 | } else { __atomic_fetch_add(&this->stats->ready.sleep.early, 1, __ATOMIC_RELAXED); } |
---|
| 646 | #endif |
---|
| 647 | break; |
---|
| 648 | case 1: |
---|
| 649 | // If someone else already said they will wake them: we are done |
---|
| 650 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 651 | if( kernelTLS().this_stats ) { __tls_stats()->ready.sleep.seen++; |
---|
| 652 | } else { __atomic_fetch_add(&this->stats->ready.sleep.seen, 1, __ATOMIC_RELAXED); } |
---|
| 653 | #endif |
---|
| 654 | break; |
---|
| 655 | default: |
---|
| 656 | // If the processor was ready to sleep, we need to wake it up with an actual write |
---|
| 657 | val = 1; |
---|
| 658 | eventfd_write( fd, val ); |
---|
| 659 | |
---|
| 660 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 661 | if( kernelTLS().this_stats ) { __tls_stats()->ready.sleep.wakes++; |
---|
| 662 | } else { __atomic_fetch_add(&this->stats->ready.sleep.wakes, 1, __ATOMIC_RELAXED); } |
---|
| 663 | #endif |
---|
| 664 | break; |
---|
| 665 | } |
---|
[1eb239e4] | 666 | |
---|
[e873838] | 667 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[8fc652e0] | 668 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 669 | |
---|
| 670 | return; |
---|
[64a7146] | 671 | } |
---|
[14a61b5] | 672 | |
---|
[64a7146] | 673 | // Unconditionnaly wake a thread |
---|
[1eb239e4] | 674 | void __wake_proc(processor * this) { |
---|
[7d0ebd0] | 675 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 676 | |
---|
[64a7146] | 677 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
[14a61b5] | 678 | |
---|
[7cf3b1d] | 679 | this->idle_wctx.fd = 1; |
---|
| 680 | |
---|
[7d0ebd0] | 681 | eventfd_t val; |
---|
| 682 | val = 1; |
---|
| 683 | eventfd_write( this->idle_fd, val ); |
---|
| 684 | |
---|
| 685 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[92e7631] | 686 | } |
---|
| 687 | |
---|
[d3605f8] | 688 | static void idle_sleep(processor * this, io_future_t & future, iovec & iov) { |
---|
[7cf3b1d] | 689 | // Tell everyone we are ready to go do sleep |
---|
| 690 | for() { |
---|
| 691 | int expected = this->idle_wctx.fd; |
---|
| 692 | |
---|
| 693 | // Someone already told us to wake-up! No time for a nap. |
---|
| 694 | if(expected == 1) { return; } |
---|
| 695 | |
---|
| 696 | // Try to mark that we are going to sleep |
---|
| 697 | if(__atomic_compare_exchange_n(&this->idle_wctx.fd, &expected, this->idle_fd, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ) { |
---|
| 698 | // Every one agreed, taking a nap |
---|
| 699 | break; |
---|
| 700 | } |
---|
| 701 | } |
---|
| 702 | |
---|
| 703 | |
---|
[d3605f8] | 704 | #if !defined(CFA_WITH_IO_URING_IDLE) |
---|
[7ef162b2] | 705 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 706 | if(this->print_halts) { |
---|
| 707 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->unique_id, rdtscl()); |
---|
| 708 | } |
---|
| 709 | #endif |
---|
[1757f98] | 710 | |
---|
[7ef162b2] | 711 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle_fd); |
---|
[1757f98] | 712 | |
---|
[7ef162b2] | 713 | { |
---|
| 714 | eventfd_t val; |
---|
| 715 | ssize_t ret = read( this->idle_fd, &val, sizeof(val) ); |
---|
| 716 | if(ret < 0) { |
---|
| 717 | switch((int)errno) { |
---|
| 718 | case EAGAIN: |
---|
| 719 | #if EAGAIN != EWOULDBLOCK |
---|
| 720 | case EWOULDBLOCK: |
---|
| 721 | #endif |
---|
| 722 | case EINTR: |
---|
| 723 | // No need to do anything special here, just assume it's a legitimate wake-up |
---|
| 724 | break; |
---|
| 725 | default: |
---|
| 726 | abort( "KERNEL : internal error, read failure on idle eventfd, error(%d) %s.", (int)errno, strerror( (int)errno ) ); |
---|
| 727 | } |
---|
[1757f98] | 728 | } |
---|
| 729 | } |
---|
| 730 | |
---|
[7ef162b2] | 731 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 732 | if(this->print_halts) { |
---|
| 733 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->unique_id, rdtscl()); |
---|
| 734 | } |
---|
| 735 | #endif |
---|
| 736 | #else |
---|
| 737 | // Do we already have a pending read |
---|
| 738 | if(available(future)) { |
---|
| 739 | // There is no pending read, we need to add one |
---|
| 740 | reset(future); |
---|
| 741 | |
---|
[d3605f8] | 742 | __kernel_read(this, future, iov, this->idle_fd ); |
---|
[1757f98] | 743 | } |
---|
[7ef162b2] | 744 | |
---|
[c7b2215] | 745 | __cfa_io_flush( this, 1 ); |
---|
[1757f98] | 746 | #endif |
---|
| 747 | } |
---|
| 748 | |
---|
[5f5a729] | 749 | static bool mark_idle(__cluster_proc_list & this, processor & proc) { |
---|
[c9c1c1c] | 750 | __STATS__(true, ready.sleep.halts++; ) |
---|
[7cf3b1d] | 751 | |
---|
| 752 | proc.idle_wctx.fd = 0; |
---|
| 753 | |
---|
[8fc652e0] | 754 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[5f5a729] | 755 | if(!try_lock( this )) return false; |
---|
[1eb239e4] | 756 | this.idle++; |
---|
| 757 | /* paranoid */ verify( this.idle <= this.total ); |
---|
[fc59b580] | 758 | remove(proc); |
---|
[6a9b12b] | 759 | insert_first(this.idles, proc); |
---|
[34b8cb7] | 760 | |
---|
[7cf3b1d] | 761 | __atomic_store_n(&this.fdw, &proc.idle_wctx, __ATOMIC_SEQ_CST); |
---|
[1eb239e4] | 762 | unlock( this ); |
---|
[8fc652e0] | 763 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[5f5a729] | 764 | |
---|
| 765 | return true; |
---|
[1eb239e4] | 766 | } |
---|
[8e16177] | 767 | |
---|
[6a9b12b] | 768 | static void mark_awake(__cluster_proc_list & this, processor & proc) { |
---|
[8fc652e0] | 769 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 770 | lock( this ); |
---|
| 771 | this.idle--; |
---|
| 772 | /* paranoid */ verify( this.idle >= 0 ); |
---|
| 773 | remove(proc); |
---|
[fc59b580] | 774 | insert_last(this.actives, proc); |
---|
[6a9b12b] | 775 | |
---|
[a633f6f] | 776 | { |
---|
[7cf3b1d] | 777 | struct __fd_waitctx * wctx = 0; |
---|
| 778 | if(!this.idles`isEmpty) wctx = &this.idles`first.idle_wctx; |
---|
| 779 | __atomic_store_n(&this.fdw, wctx, __ATOMIC_SEQ_CST); |
---|
[a633f6f] | 780 | } |
---|
| 781 | |
---|
[34b8cb7] | 782 | unlock( this ); |
---|
[6a9b12b] | 783 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[6b4cdd3] | 784 | } |
---|
| 785 | |
---|
[dbe9b08] | 786 | //============================================================================================= |
---|
| 787 | // Unexpected Terminating logic |
---|
| 788 | //============================================================================================= |
---|
[92bfda0] | 789 | void __kernel_abort_msg( char * abort_text, int abort_text_size ) { |
---|
[e84ab3d] | 790 | thread$ * thrd = __cfaabi_tls.this_thread; |
---|
[9d944b2] | 791 | |
---|
[de94a60] | 792 | if(thrd) { |
---|
| 793 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[1c40091] | 794 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 795 | |
---|
[212c2187] | 796 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 797 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[1c40091] | 798 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 799 | } |
---|
| 800 | else { |
---|
[1c40091] | 801 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
[de94a60] | 802 | } |
---|
[1c273d0] | 803 | } |
---|
[9d944b2] | 804 | else { |
---|
[de94a60] | 805 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[1c40091] | 806 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[9d944b2] | 807 | } |
---|
| 808 | } |
---|
| 809 | |
---|
[92bfda0] | 810 | int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 811 | return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 812 | } |
---|
| 813 | |
---|
[de94a60] | 814 | static __spinlock_t kernel_debug_lock; |
---|
| 815 | |
---|
[9d944b2] | 816 | extern "C" { |
---|
[1c40091] | 817 | void __cfaabi_bits_acquire() { |
---|
[36982fc] | 818 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 819 | } |
---|
| 820 | |
---|
[1c40091] | 821 | void __cfaabi_bits_release() { |
---|
[ea7d2b0] | 822 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 823 | } |
---|
[8118303] | 824 | } |
---|
| 825 | |
---|
[fa21ac9] | 826 | //============================================================================================= |
---|
| 827 | // Kernel Utilities |
---|
| 828 | //============================================================================================= |
---|
[dddb3dd0] | 829 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 830 | #include "io/types.hfa" |
---|
| 831 | #endif |
---|
| 832 | |
---|
[c1c95b1] | 833 | static inline bool __maybe_io_drain( processor * proc ) { |
---|
[e9c0b4c] | 834 | bool ret = false; |
---|
[dddb3dd0] | 835 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 836 | __cfadbg_print_safe(runtime_core, "Kernel : core %p checking io for ring %d\n", proc, proc->io.ctx->fd); |
---|
| 837 | |
---|
| 838 | // Check if we should drain the queue |
---|
| 839 | $io_context * ctx = proc->io.ctx; |
---|
| 840 | unsigned head = *ctx->cq.head; |
---|
| 841 | unsigned tail = *ctx->cq.tail; |
---|
[c1c95b1] | 842 | if(head == tail) return false; |
---|
[040334e] | 843 | ready_schedule_lock(); |
---|
| 844 | ret = __cfa_io_drain( proc ); |
---|
| 845 | ready_schedule_unlock(); |
---|
[dddb3dd0] | 846 | #endif |
---|
[e9c0b4c] | 847 | return ret; |
---|
[dddb3dd0] | 848 | } |
---|
| 849 | |
---|
[de94a60] | 850 | //----------------------------------------------------------------------------- |
---|
| 851 | // Debug |
---|
| 852 | __cfaabi_dbg_debug_do( |
---|
[1997b4e] | 853 | extern "C" { |
---|
[ae66348] | 854 | void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) { |
---|
[1997b4e] | 855 | this.prev_name = prev_name; |
---|
[8fc652e0] | 856 | this.prev_thrd = kernelTLS().this_thread; |
---|
[1997b4e] | 857 | } |
---|
[9181f1d] | 858 | } |
---|
[f7d6bb0] | 859 | ) |
---|
[2026bb6] | 860 | |
---|
| 861 | //----------------------------------------------------------------------------- |
---|
| 862 | // Debug |
---|
[8c50aed] | 863 | bool threading_enabled(void) __attribute__((const)) { |
---|
[2026bb6] | 864 | return true; |
---|
| 865 | } |
---|
[c34ebf2] | 866 | |
---|
| 867 | //----------------------------------------------------------------------------- |
---|
| 868 | // Statistics |
---|
| 869 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 870 | void print_halts( processor & this ) { |
---|
| 871 | this.print_halts = true; |
---|
| 872 | } |
---|
[58688bf] | 873 | |
---|
[69914cbc] | 874 | static void crawl_list( cluster * cltr, dlist(processor) & list, unsigned count ) { |
---|
[8464edf] | 875 | /* paranoid */ verify( cltr->stats ); |
---|
| 876 | |
---|
| 877 | processor * it = &list`first; |
---|
| 878 | for(unsigned i = 0; i < count; i++) { |
---|
| 879 | /* paranoid */ verifyf( it, "Unexpected null iterator, at index %u of %u\n", i, count); |
---|
| 880 | /* paranoid */ verify( it->local_data->this_stats ); |
---|
[c33c2af] | 881 | // __print_stats( it->local_data->this_stats, cltr->print_stats, "Processor", it->name, (void*)it ); |
---|
[8464edf] | 882 | __tally_stats( cltr->stats, it->local_data->this_stats ); |
---|
| 883 | it = &(*it)`next; |
---|
| 884 | } |
---|
| 885 | } |
---|
| 886 | |
---|
| 887 | void crawl_cluster_stats( cluster & this ) { |
---|
| 888 | // Stop the world, otherwise stats could get really messed-up |
---|
| 889 | // this doesn't solve all problems but does solve many |
---|
| 890 | // so it's probably good enough |
---|
[c33c2af] | 891 | disable_interrupts(); |
---|
[8464edf] | 892 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
| 893 | |
---|
| 894 | crawl_list(&this, this.procs.actives, this.procs.total - this.procs.idle); |
---|
| 895 | crawl_list(&this, this.procs.idles , this.procs.idle ); |
---|
| 896 | |
---|
| 897 | // Unlock the RWlock |
---|
| 898 | ready_mutate_unlock( last_size ); |
---|
[c33c2af] | 899 | enable_interrupts(); |
---|
[8464edf] | 900 | } |
---|
| 901 | |
---|
| 902 | |
---|
[58688bf] | 903 | void print_stats_now( cluster & this, int flags ) { |
---|
[8464edf] | 904 | crawl_cluster_stats( this ); |
---|
[1b033b8] | 905 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
---|
| 906 | } |
---|
[c34ebf2] | 907 | #endif |
---|
[8118303] | 908 | // Local Variables: // |
---|
| 909 | // mode: c // |
---|
| 910 | // tab-width: 4 // |
---|
| 911 | // End: // |
---|