[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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[4069faad] | 17 | // #define __CFA_DEBUG_PRINT_RUNTIME_CORE__ |
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[2026bb6] | 18 | |
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[8118303] | 19 | //C Includes |
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[214e8da] | 20 | #include <errno.h> |
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[9d944b2] | 21 | #include <stdio.h> |
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[58b6d1b] | 22 | #include <signal.h> |
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[9d944b2] | 23 | #include <unistd.h> |
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[8118303] | 24 | |
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| 25 | //CFA Includes |
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[73abe95] | 26 | #include "kernel_private.hfa" |
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| 27 | #include "preemption.hfa" |
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[8118303] | 28 | |
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| 29 | //Private includes |
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| 30 | #define __CFA_INVOKE_PRIVATE__ |
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| 31 | #include "invoke.h" |
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| 32 | |
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[4069faad] | 33 | |
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[deca0f5] | 34 | //----------------------------------------------------------------------------- |
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| 35 | // Some assembly required |
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[1805b1b] | 36 | #if defined( __i386 ) |
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[deca0f5] | 37 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 38 | // fcw : X87 FPU control word (preserved across function calls) |
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| 39 | #define __x87_store \ |
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| 40 | uint32_t __mxcr; \ |
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| 41 | uint16_t __fcw; \ |
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| 42 | __asm__ volatile ( \ |
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| 43 | "stmxcsr %0\n" \ |
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| 44 | "fnstcw %1\n" \ |
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| 45 | : "=m" (__mxcr),\ |
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| 46 | "=m" (__fcw) \ |
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| 47 | ) |
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| 48 | |
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| 49 | #define __x87_load \ |
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| 50 | __asm__ volatile ( \ |
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| 51 | "fldcw %1\n" \ |
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| 52 | "ldmxcsr %0\n" \ |
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| 53 | ::"m" (__mxcr),\ |
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| 54 | "m" (__fcw) \ |
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| 55 | ) |
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| 56 | |
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| 57 | #elif defined( __x86_64 ) |
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| 58 | #define __x87_store \ |
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| 59 | uint32_t __mxcr; \ |
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| 60 | uint16_t __fcw; \ |
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| 61 | __asm__ volatile ( \ |
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| 62 | "stmxcsr %0\n" \ |
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| 63 | "fnstcw %1\n" \ |
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| 64 | : "=m" (__mxcr),\ |
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| 65 | "=m" (__fcw) \ |
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| 66 | ) |
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| 67 | |
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| 68 | #define __x87_load \ |
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| 69 | __asm__ volatile ( \ |
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| 70 | "fldcw %1\n" \ |
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| 71 | "ldmxcsr %0\n" \ |
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| 72 | :: "m" (__mxcr),\ |
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| 73 | "m" (__fcw) \ |
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| 74 | ) |
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| 75 | |
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[0190480] | 76 | #elif defined( __arm__ ) |
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| 77 | #define __x87_store |
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| 78 | #define __x87_load |
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| 79 | |
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| 80 | #elif defined( __aarch64__ ) |
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[74f5c83] | 81 | #define __x87_store \ |
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| 82 | uint32_t __fpcntl[2]; \ |
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| 83 | __asm__ volatile ( \ |
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| 84 | "mrs x9, FPCR\n" \ |
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| 85 | "mrs x10, FPSR\n" \ |
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| 86 | "stp x9, x10, %0\n" \ |
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| 87 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 88 | ) |
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| 89 | |
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| 90 | #define __x87_load \ |
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| 91 | __asm__ volatile ( \ |
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| 92 | "ldp x9, x10, %0\n" \ |
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| 93 | "msr FPSR, x10\n" \ |
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| 94 | "msr FPCR, x9\n" \ |
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| 95 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 96 | ) |
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| 97 | |
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[deca0f5] | 98 | #else |
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[0190480] | 99 | #error unsupported hardware architecture |
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[deca0f5] | 100 | #endif |
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| 101 | |
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[e660761] | 102 | extern $thread * mainThread; |
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| 103 | extern processor * mainProcessor; |
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[2ac095d] | 104 | |
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[92e7631] | 105 | //----------------------------------------------------------------------------- |
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| 106 | // Kernel Scheduling logic |
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| 107 | static $thread * __next_thread(cluster * this); |
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[1eb239e4] | 108 | static $thread * __next_thread_slow(cluster * this); |
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[92e7631] | 109 | static void __run_thread(processor * this, $thread * dst); |
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[e873838] | 110 | static void __wake_one(cluster * cltr); |
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[da3963a] | 111 | static void wait(__bin_sem_t & this); |
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[1eb239e4] | 112 | |
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| 113 | static void push (__cluster_idles & idles, processor & proc); |
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| 114 | static void remove(__cluster_idles & idles, processor & proc); |
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| 115 | static [unsigned idle, unsigned total, * processor] query( & __cluster_idles idles ); |
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| 116 | |
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[c84e80a] | 117 | |
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[75f3522] | 118 | //============================================================================================= |
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| 119 | // Kernel Scheduling logic |
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| 120 | //============================================================================================= |
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[8fcbb4c] | 121 | //Main of the processor contexts |
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[83a071f9] | 122 | void main(processorCtx_t & runner) { |
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[21184e3] | 123 | // Because of a bug, we couldn't initialized the seed on construction |
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| 124 | // Do it here |
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[8fc652e0] | 125 | __cfaabi_tls.rand_seed ^= rdtscl(); |
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| 126 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner); |
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[f2384c9a] | 127 | __tls_rand_advance_bck(); |
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[21184e3] | 128 | |
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[83a071f9] | 129 | processor * this = runner.proc; |
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[094476d] | 130 | verify(this); |
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[c81ebf9] | 131 | |
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[4069faad] | 132 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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[28d73c1] | 133 | #if !defined(__CFA_NO_STATISTICS__) |
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| 134 | if( this->print_halts ) { |
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| 135 | __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->id, this->name, (void*)this); |
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| 136 | } |
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| 137 | #endif |
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[b798713] | 138 | |
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[75f3522] | 139 | { |
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[c81ebf9] | 140 | // Setup preemption data |
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| 141 | preemption_scope scope = { this }; |
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| 142 | |
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[325e6ea] | 143 | #if !defined(__CFA_NO_STATISTICS__) |
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| 144 | unsigned long long last_tally = rdtscl(); |
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| 145 | #endif |
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| 146 | |
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| 147 | |
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[4069faad] | 148 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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[8118303] | 149 | |
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[ac2b598] | 150 | $thread * readyThread = 0p; |
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[1eb239e4] | 151 | MAIN_LOOP: |
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| 152 | for() { |
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[92e7631] | 153 | // Try to get the next thread |
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[8c50aed] | 154 | readyThread = __next_thread( this->cltr ); |
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[75f3522] | 155 | |
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[1eb239e4] | 156 | if( !readyThread ) { |
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| 157 | readyThread = __next_thread_slow( this->cltr ); |
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| 158 | } |
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[4e6fb8e] | 159 | |
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[1eb239e4] | 160 | HALT: |
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| 161 | if( !readyThread ) { |
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| 162 | // Don't block if we are done |
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| 163 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[c81ebf9] | 164 | |
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[1eb239e4] | 165 | #if !defined(__CFA_NO_STATISTICS__) |
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| 166 | __tls_stats()->ready.sleep.halts++; |
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| 167 | #endif |
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[398e8e9] | 168 | |
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[1eb239e4] | 169 | // Push self to idle stack |
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| 170 | push(this->cltr->idles, * this); |
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[398e8e9] | 171 | |
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[1eb239e4] | 172 | // Confirm the ready-queue is empty |
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| 173 | readyThread = __next_thread_slow( this->cltr ); |
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| 174 | if( readyThread ) { |
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| 175 | // A thread was found, cancel the halt |
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| 176 | remove(this->cltr->idles, * this); |
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| 177 | |
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| 178 | #if !defined(__CFA_NO_STATISTICS__) |
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| 179 | __tls_stats()->ready.sleep.cancels++; |
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| 180 | #endif |
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| 181 | |
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| 182 | // continue the mai loop |
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| 183 | break HALT; |
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| 184 | } |
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| 185 | |
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| 186 | #if !defined(__CFA_NO_STATISTICS__) |
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| 187 | if(this->print_halts) { |
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| 188 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->id, rdtscl()); |
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| 189 | } |
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| 190 | #endif |
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| 191 | |
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| 192 | wait( this->idle ); |
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| 193 | |
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| 194 | #if !defined(__CFA_NO_STATISTICS__) |
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| 195 | if(this->print_halts) { |
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| 196 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->id, rdtscl()); |
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| 197 | } |
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| 198 | #endif |
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| 199 | |
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| 200 | // We were woken up, remove self from idle |
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| 201 | remove(this->cltr->idles, * this); |
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| 202 | |
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| 203 | // DON'T just proceed, start looking again |
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| 204 | continue MAIN_LOOP; |
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[64a7146] | 205 | } |
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[1eb239e4] | 206 | |
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| 207 | /* paranoid */ verify( readyThread ); |
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| 208 | |
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| 209 | // We found a thread run it |
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| 210 | __run_thread(this, readyThread); |
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| 211 | |
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| 212 | // Are we done? |
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| 213 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[325e6ea] | 214 | |
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| 215 | #if !defined(__CFA_NO_STATISTICS__) |
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| 216 | unsigned long long curr = rdtscl(); |
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| 217 | if(curr > (last_tally + 500000000)) { |
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| 218 | __tally_stats(this->cltr->stats, __cfaabi_tls.this_stats); |
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| 219 | last_tally = curr; |
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| 220 | } |
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| 221 | #endif |
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[c81ebf9] | 222 | } |
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| 223 | |
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[4069faad] | 224 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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[c84e80a] | 225 | } |
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[8118303] | 226 | |
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[454f478] | 227 | post( this->terminated ); |
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[bdeba0b] | 228 | |
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[28d73c1] | 229 | if(this == mainProcessor) { |
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[6a490b2] | 230 | // HACK : the coroutine context switch expects this_thread to be set |
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| 231 | // and it make sense for it to be set in all other cases except here |
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| 232 | // fake it |
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[8fc652e0] | 233 | __cfaabi_tls.this_thread = mainThread; |
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[6a490b2] | 234 | } |
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[7768b8d] | 235 | |
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[4069faad] | 236 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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[c84e80a] | 237 | } |
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| 238 | |
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[5c1a531] | 239 | static int * __volatile_errno() __attribute__((noinline)); |
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| 240 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 241 | |
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[14a61b5] | 242 | // KERNEL ONLY |
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[1c273d0] | 243 | // runThread runs a thread by context switching |
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| 244 | // from the processor coroutine to the target thread |
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[ac2b598] | 245 | static void __run_thread(processor * this, $thread * thrd_dst) { |
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[8fc652e0] | 246 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[1eb239e4] | 247 | /* 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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| 248 | /* paranoid */ verifyf( thrd_dst->link.next == 0p, "Expected null got %p", thrd_dst->link.next ); |
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| 249 | __builtin_prefetch( thrd_dst->context.SP ); |
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| 250 | |
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[ac2b598] | 251 | $coroutine * proc_cor = get_coroutine(this->runner); |
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[8fcbb4c] | 252 | |
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[9f575ea] | 253 | // set state of processor coroutine to inactive |
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| 254 | verify(proc_cor->state == Active); |
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[ae7be7a] | 255 | proc_cor->state = Blocked; |
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[e8e457e] | 256 | |
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[9f575ea] | 257 | // Actually run the thread |
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[3381ed7] | 258 | RUNNING: while(true) { |
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[ff79d5e] | 259 | thrd_dst->preempted = __NO_PREEMPTION; |
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| 260 | thrd_dst->state = Active; |
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[e8e457e] | 261 | |
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[58d64a4] | 262 | // Update global state |
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[8fc652e0] | 263 | kernelTLS().this_thread = thrd_dst; |
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[75f3522] | 264 | |
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[8fc652e0] | 265 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 266 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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[9d6e1b8a] | 267 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[b4b63e8] | 268 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[5afb49a] | 269 | /* paranoid */ verify( thrd_dst->state != Halted ); |
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[210b8b3] | 270 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor, "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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| 271 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor, "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] | 272 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[b4b63e8] | 273 | |
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[3381ed7] | 274 | |
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[58d64a4] | 275 | |
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[9f575ea] | 276 | // set context switch to the thread that the processor is executing |
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[c7a900a] | 277 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
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| 278 | // when __cfactx_switch returns we are back in the processor coroutine |
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[9f575ea] | 279 | |
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[ac12f1f] | 280 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[210b8b3] | 281 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); |
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| 282 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); |
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[b4b63e8] | 283 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[9d6e1b8a] | 284 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[8fc652e0] | 285 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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| 286 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[75f3522] | 287 | |
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[58d64a4] | 288 | // Reset global state |
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[8fc652e0] | 289 | kernelTLS().this_thread = 0p; |
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[3381ed7] | 290 | |
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| 291 | // We just finished running a thread, there are a few things that could have happened. |
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| 292 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
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| 293 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
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| 294 | // 4 - Preempted |
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| 295 | // In case 1, we may have won a race so we can't write to the state again. |
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| 296 | // In case 2, we lost the race so we now own the thread. |
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| 297 | |
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| 298 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
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| 299 | // The thread was preempted, reschedule it and reset the flag |
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[e873838] | 300 | __schedule_thread( thrd_dst ); |
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[3381ed7] | 301 | break RUNNING; |
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| 302 | } |
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[75f3522] | 303 | |
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[3ea8ad1] | 304 | if(unlikely(thrd_dst->state == Halting)) { |
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[ff79d5e] | 305 | // The thread has halted, it should never be scheduled/run again |
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[5afb49a] | 306 | // finish the thread |
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| 307 | __thread_finish( thrd_dst ); |
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[ff79d5e] | 308 | break RUNNING; |
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| 309 | } |
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| 310 | |
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| 311 | /* paranoid */ verify( thrd_dst->state == Active ); |
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| 312 | thrd_dst->state = Blocked; |
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| 313 | |
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[3381ed7] | 314 | // set state of processor coroutine to active and the thread to inactive |
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[ff79d5e] | 315 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
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| 316 | switch(old_ticket) { |
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[6a77224] | 317 | case TICKET_RUNNING: |
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[3381ed7] | 318 | // This is case 1, the regular case, nothing more is needed |
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| 319 | break RUNNING; |
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[6a77224] | 320 | case TICKET_UNBLOCK: |
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[3381ed7] | 321 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
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| 322 | // In this case, just run it again. |
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| 323 | continue RUNNING; |
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| 324 | default: |
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| 325 | // This makes no sense, something is wrong abort |
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[ff79d5e] | 326 | abort(); |
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[3381ed7] | 327 | } |
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[9f575ea] | 328 | } |
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[e8e457e] | 329 | |
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[9f575ea] | 330 | // Just before returning to the processor, set the processor coroutine to active |
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[e8e457e] | 331 | proc_cor->state = Active; |
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[1eb239e4] | 332 | |
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[8fc652e0] | 333 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[82c948c] | 334 | } |
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| 335 | |
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[14a61b5] | 336 | // KERNEL_ONLY |
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[b0c7419] | 337 | void returnToKernel() { |
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[8fc652e0] | 338 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 339 | $coroutine * proc_cor = get_coroutine(kernelTLS().this_processor->runner); |
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| 340 | $thread * thrd_src = kernelTLS().this_thread; |
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[e8e457e] | 341 | |
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[29cb302] | 342 | #if !defined(__CFA_NO_STATISTICS__) |
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[8fc652e0] | 343 | struct processor * last_proc = kernelTLS().this_processor; |
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[29cb302] | 344 | #endif |
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| 345 | |
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[9f575ea] | 346 | // Run the thread on this processor |
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| 347 | { |
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| 348 | int local_errno = *__volatile_errno(); |
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| 349 | #if defined( __i386 ) || defined( __x86_64 ) |
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| 350 | __x87_store; |
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| 351 | #endif |
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[b4b63e8] | 352 | /* paranoid */ verify( proc_cor->context.SP ); |
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[ac12f1f] | 353 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
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[c7a900a] | 354 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
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[ac12f1f] | 355 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
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[9f575ea] | 356 | #if defined( __i386 ) || defined( __x86_64 ) |
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| 357 | __x87_load; |
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| 358 | #endif |
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| 359 | *__volatile_errno() = local_errno; |
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[8fcbb4c] | 360 | } |
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[deca0f5] | 361 | |
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[29cb302] | 362 | #if !defined(__CFA_NO_STATISTICS__) |
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[8fc652e0] | 363 | if(last_proc != kernelTLS().this_processor) { |
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[29cb302] | 364 | __tls_stats()->ready.threads.migration++; |
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| 365 | } |
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| 366 | #endif |
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| 367 | |
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[8fc652e0] | 368 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[210b8b3] | 369 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too small.\n", thrd_src ); |
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| 370 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too large.\n", thrd_src ); |
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[c84e80a] | 371 | } |
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| 372 | |
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[8def349] | 373 | //----------------------------------------------------------------------------- |
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| 374 | // Scheduler routines |
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[14a61b5] | 375 | // KERNEL ONLY |
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[e873838] | 376 | void __schedule_thread( $thread * thrd ) { |
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[8fc652e0] | 377 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[9d6e1b8a] | 378 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
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[6a490b2] | 379 | /* paranoid */ verify( thrd ); |
---|
| 380 | /* paranoid */ verify( thrd->state != Halted ); |
---|
[9d6e1b8a] | 381 | /* paranoid */ verify( thrd->curr_cluster ); |
---|
[3381ed7] | 382 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
[504a7dc] | 383 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
| 384 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[ff79d5e] | 385 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
[504a7dc] | 386 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[3381ed7] | 387 | /* paranoid */ #endif |
---|
[6a490b2] | 388 | /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next ); |
---|
[ac12f1f] | 389 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
[b4b63e8] | 390 | |
---|
[9f575ea] | 391 | |
---|
[ae7be7a] | 392 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
[6b4cdd3] | 393 | |
---|
[e873838] | 394 | ready_schedule_lock(); |
---|
[32a8b61] | 395 | // Dereference the thread now because once we push it, there is not guaranteed it's still valid. |
---|
| 396 | struct cluster * cl = thrd->curr_cluster; |
---|
| 397 | |
---|
| 398 | // push the thread to the cluster ready-queue |
---|
| 399 | push( cl, thrd ); |
---|
| 400 | |
---|
| 401 | // variable thrd is no longer safe to use |
---|
| 402 | |
---|
| 403 | // wake the cluster using the save variable. |
---|
| 404 | __wake_one( cl ); |
---|
[e873838] | 405 | ready_schedule_unlock(); |
---|
[1c273d0] | 406 | |
---|
[8fc652e0] | 407 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[db6f06a] | 408 | } |
---|
| 409 | |
---|
[14a61b5] | 410 | // KERNEL ONLY |
---|
[1eb239e4] | 411 | static inline $thread * __next_thread(cluster * this) with( *this ) { |
---|
[8fc652e0] | 412 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 413 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
[7768b8d] | 414 | |
---|
[e873838] | 415 | ready_schedule_lock(); |
---|
[1eb239e4] | 416 | $thread * thrd = pop( this ); |
---|
[e873838] | 417 | ready_schedule_unlock(); |
---|
[7768b8d] | 418 | |
---|
[8fc652e0] | 419 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
| 420 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 421 | return thrd; |
---|
[eb2e723] | 422 | } |
---|
| 423 | |
---|
[64a7146] | 424 | // KERNEL ONLY |
---|
[1eb239e4] | 425 | static inline $thread * __next_thread_slow(cluster * this) with( *this ) { |
---|
[8fc652e0] | 426 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 427 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
[64a7146] | 428 | |
---|
[e873838] | 429 | ready_schedule_lock(); |
---|
[1eb239e4] | 430 | $thread * thrd = pop_slow( this ); |
---|
[e873838] | 431 | ready_schedule_unlock(); |
---|
[64a7146] | 432 | |
---|
[8fc652e0] | 433 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
| 434 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 435 | return thrd; |
---|
[64a7146] | 436 | } |
---|
| 437 | |
---|
[e873838] | 438 | void unpark( $thread * thrd ) { |
---|
| 439 | if( !thrd ) return; |
---|
| 440 | |
---|
[ff79d5e] | 441 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 442 | switch(old_ticket) { |
---|
[6a77224] | 443 | case TICKET_RUNNING: |
---|
[3381ed7] | 444 | // Wake won the race, the thread will reschedule/rerun itself |
---|
| 445 | break; |
---|
[6a77224] | 446 | case TICKET_BLOCKED: |
---|
[3381ed7] | 447 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
[ff79d5e] | 448 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
[0b33412] | 449 | |
---|
[8fc652e0] | 450 | { |
---|
| 451 | /* paranoid */ verify( publicTLS_get(this_proc_id) ); |
---|
| 452 | bool full = publicTLS_get(this_proc_id)->full_proc; |
---|
| 453 | if(full) disable_interrupts(); |
---|
| 454 | |
---|
| 455 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 456 | |
---|
| 457 | // Wake lost the race, |
---|
| 458 | __schedule_thread( thrd ); |
---|
| 459 | |
---|
| 460 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 461 | |
---|
| 462 | if(full) enable_interrupts( __cfaabi_dbg_ctx ); |
---|
| 463 | /* paranoid */ verify( publicTLS_get(this_proc_id) ); |
---|
| 464 | } |
---|
| 465 | |
---|
[3381ed7] | 466 | break; |
---|
| 467 | default: |
---|
| 468 | // This makes no sense, something is wrong abort |
---|
[7ee8153] | 469 | abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name); |
---|
[de6319f] | 470 | } |
---|
[eb2e723] | 471 | } |
---|
| 472 | |
---|
[e235429] | 473 | void park( void ) { |
---|
[8fc652e0] | 474 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[82ff5845] | 475 | disable_interrupts(); |
---|
[8fc652e0] | 476 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 477 | /* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION ); |
---|
[0b33412] | 478 | |
---|
[82c948c] | 479 | returnToKernel(); |
---|
[0b33412] | 480 | |
---|
[8fc652e0] | 481 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[36982fc] | 482 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[8fc652e0] | 483 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[0c78741] | 484 | |
---|
| 485 | } |
---|
[09800e9] | 486 | |
---|
[5afb49a] | 487 | extern "C" { |
---|
| 488 | // Leave the thread monitor |
---|
| 489 | // last routine called by a thread. |
---|
| 490 | // Should never return |
---|
| 491 | void __cfactx_thrd_leave() { |
---|
[8fc652e0] | 492 | $thread * thrd = active_thread(); |
---|
[5afb49a] | 493 | $monitor * this = &thrd->self_mon; |
---|
| 494 | |
---|
| 495 | // Lock the monitor now |
---|
| 496 | lock( this->lock __cfaabi_dbg_ctx2 ); |
---|
| 497 | |
---|
| 498 | disable_interrupts(); |
---|
| 499 | |
---|
[9d6e1b8a] | 500 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 501 | /* paranoid */ verify( thrd->state == Active ); |
---|
| 502 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
| 503 | /* paranoid */ verify( kernelTLS().this_thread == thrd ); |
---|
| 504 | /* paranoid */ verify( thrd->context.SP ); |
---|
| 505 | /* 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 ); |
---|
| 506 | /* 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 ); |
---|
| 507 | |
---|
[3ea8ad1] | 508 | thrd->state = Halting; |
---|
[58688bf] | 509 | if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); } |
---|
[9d6e1b8a] | 510 | if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); } |
---|
| 511 | if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); } |
---|
[5afb49a] | 512 | |
---|
| 513 | // Leave the thread |
---|
| 514 | returnToKernel(); |
---|
| 515 | |
---|
| 516 | // Control flow should never reach here! |
---|
[9d6e1b8a] | 517 | abort(); |
---|
[5afb49a] | 518 | } |
---|
[09800e9] | 519 | } |
---|
| 520 | |
---|
[14a61b5] | 521 | // KERNEL ONLY |
---|
[3381ed7] | 522 | bool force_yield( __Preemption_Reason reason ) { |
---|
[8fc652e0] | 523 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[09800e9] | 524 | disable_interrupts(); |
---|
[8fc652e0] | 525 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[09800e9] | 526 | |
---|
[8fc652e0] | 527 | $thread * thrd = kernelTLS().this_thread; |
---|
[ff79d5e] | 528 | /* paranoid */ verify(thrd->state == Active); |
---|
[3381ed7] | 529 | |
---|
| 530 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
| 531 | // it was going to park itself. If that is the case and it is already using the |
---|
| 532 | // intrusive fields then we can't use them to preempt the thread |
---|
| 533 | // If that is the case, abandon the preemption. |
---|
| 534 | bool preempted = false; |
---|
[504a7dc] | 535 | if(thrd->link.next == 0p) { |
---|
[3381ed7] | 536 | preempted = true; |
---|
| 537 | thrd->preempted = reason; |
---|
| 538 | returnToKernel(); |
---|
[de6319f] | 539 | } |
---|
[f2b12406] | 540 | |
---|
[8fc652e0] | 541 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[3381ed7] | 542 | enable_interrupts_noPoll(); |
---|
[8fc652e0] | 543 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[f2b12406] | 544 | |
---|
[3381ed7] | 545 | return preempted; |
---|
[f2b12406] | 546 | } |
---|
| 547 | |
---|
[14a61b5] | 548 | //============================================================================================= |
---|
[92e7631] | 549 | // Kernel Idle Sleep |
---|
[14a61b5] | 550 | //============================================================================================= |
---|
[da3963a] | 551 | extern "C" { |
---|
| 552 | char * strerror(int); |
---|
| 553 | } |
---|
| 554 | #define CHECKED(x) { int err = x; if( err != 0 ) abort("KERNEL ERROR: Operation \"" #x "\" return error %d - %s\n", err, strerror(err)); } |
---|
| 555 | |
---|
| 556 | static void wait(__bin_sem_t & this) with( this ) { |
---|
| 557 | verify(__cfaabi_dbg_in_kernel()); |
---|
| 558 | CHECKED( pthread_mutex_lock(&lock) ); |
---|
| 559 | while(val < 1) { |
---|
| 560 | pthread_cond_wait(&cond, &lock); |
---|
| 561 | } |
---|
| 562 | val -= 1; |
---|
| 563 | CHECKED( pthread_mutex_unlock(&lock) ); |
---|
| 564 | } |
---|
| 565 | |
---|
| 566 | static bool post(__bin_sem_t & this) with( this ) { |
---|
| 567 | bool needs_signal = false; |
---|
| 568 | |
---|
| 569 | CHECKED( pthread_mutex_lock(&lock) ); |
---|
| 570 | if(val < 1) { |
---|
| 571 | val += 1; |
---|
| 572 | pthread_cond_signal(&cond); |
---|
| 573 | needs_signal = true; |
---|
| 574 | } |
---|
| 575 | CHECKED( pthread_mutex_unlock(&lock) ); |
---|
| 576 | |
---|
| 577 | return needs_signal; |
---|
| 578 | } |
---|
| 579 | |
---|
| 580 | #undef CHECKED |
---|
| 581 | |
---|
[64a7146] | 582 | // Wake a thread from the front if there are any |
---|
[e873838] | 583 | static void __wake_one(cluster * this) { |
---|
[8fc652e0] | 584 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e873838] | 585 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[14a61b5] | 586 | |
---|
[64a7146] | 587 | // Check if there is a sleeping processor |
---|
[1eb239e4] | 588 | processor * p; |
---|
| 589 | unsigned idle; |
---|
| 590 | unsigned total; |
---|
| 591 | [idle, total, p] = query(this->idles); |
---|
[14a61b5] | 592 | |
---|
[64a7146] | 593 | // If no one is sleeping, we are done |
---|
[1eb239e4] | 594 | if( idle == 0 ) return; |
---|
[14a61b5] | 595 | |
---|
[64a7146] | 596 | // We found a processor, wake it up |
---|
| 597 | post( p->idle ); |
---|
[14a61b5] | 598 | |
---|
[1eb239e4] | 599 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 600 | __tls_stats()->ready.sleep.wakes++; |
---|
| 601 | #endif |
---|
| 602 | |
---|
[e873838] | 603 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[8fc652e0] | 604 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 605 | |
---|
| 606 | return; |
---|
[64a7146] | 607 | } |
---|
[14a61b5] | 608 | |
---|
[64a7146] | 609 | // Unconditionnaly wake a thread |
---|
[1eb239e4] | 610 | void __wake_proc(processor * this) { |
---|
[64a7146] | 611 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
[14a61b5] | 612 | |
---|
[64a7146] | 613 | disable_interrupts(); |
---|
[8fc652e0] | 614 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[58d64a4] | 615 | post( this->idle ); |
---|
[64a7146] | 616 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[92e7631] | 617 | } |
---|
| 618 | |
---|
[1eb239e4] | 619 | static void push (__cluster_idles & this, processor & proc) { |
---|
[8fc652e0] | 620 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 621 | lock( this ); |
---|
| 622 | this.idle++; |
---|
| 623 | /* paranoid */ verify( this.idle <= this.total ); |
---|
[8e16177] | 624 | |
---|
[1eb239e4] | 625 | insert_first(this.list, proc); |
---|
| 626 | unlock( this ); |
---|
[8fc652e0] | 627 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 628 | } |
---|
[8e16177] | 629 | |
---|
[1eb239e4] | 630 | static void remove(__cluster_idles & this, processor & proc) { |
---|
[8fc652e0] | 631 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 632 | lock( this ); |
---|
| 633 | this.idle--; |
---|
| 634 | /* paranoid */ verify( this.idle >= 0 ); |
---|
[c34ebf2] | 635 | |
---|
[1eb239e4] | 636 | remove(proc); |
---|
| 637 | unlock( this ); |
---|
[8fc652e0] | 638 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 639 | } |
---|
[c34ebf2] | 640 | |
---|
[1eb239e4] | 641 | static [unsigned idle, unsigned total, * processor] query( & __cluster_idles this ) { |
---|
| 642 | for() { |
---|
| 643 | uint64_t l = __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST); |
---|
| 644 | if( 1 == (l % 2) ) { Pause(); continue; } |
---|
| 645 | unsigned idle = this.idle; |
---|
| 646 | unsigned total = this.total; |
---|
| 647 | processor * proc = &this.list`first; |
---|
[7fdae38] | 648 | // Compiler fence is unnecessary, but gcc-8 and older incorrectly reorder code without it |
---|
| 649 | asm volatile("": : :"memory"); |
---|
[1eb239e4] | 650 | if(l != __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST)) { Pause(); continue; } |
---|
| 651 | return [idle, total, proc]; |
---|
| 652 | } |
---|
[6b4cdd3] | 653 | } |
---|
| 654 | |
---|
[dbe9b08] | 655 | //============================================================================================= |
---|
| 656 | // Unexpected Terminating logic |
---|
| 657 | //============================================================================================= |
---|
[92bfda0] | 658 | void __kernel_abort_msg( char * abort_text, int abort_text_size ) { |
---|
| 659 | $thread * thrd = __cfaabi_tls.this_thread; |
---|
[9d944b2] | 660 | |
---|
[de94a60] | 661 | if(thrd) { |
---|
| 662 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[1c40091] | 663 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 664 | |
---|
[212c2187] | 665 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 666 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[1c40091] | 667 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 668 | } |
---|
| 669 | else { |
---|
[1c40091] | 670 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
[de94a60] | 671 | } |
---|
[1c273d0] | 672 | } |
---|
[9d944b2] | 673 | else { |
---|
[de94a60] | 674 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[1c40091] | 675 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[9d944b2] | 676 | } |
---|
| 677 | } |
---|
| 678 | |
---|
[92bfda0] | 679 | int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 680 | return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 681 | } |
---|
| 682 | |
---|
[de94a60] | 683 | static __spinlock_t kernel_debug_lock; |
---|
| 684 | |
---|
[9d944b2] | 685 | extern "C" { |
---|
[1c40091] | 686 | void __cfaabi_bits_acquire() { |
---|
[36982fc] | 687 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 688 | } |
---|
| 689 | |
---|
[1c40091] | 690 | void __cfaabi_bits_release() { |
---|
[ea7d2b0] | 691 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 692 | } |
---|
[8118303] | 693 | } |
---|
| 694 | |
---|
[fa21ac9] | 695 | //============================================================================================= |
---|
| 696 | // Kernel Utilities |
---|
| 697 | //============================================================================================= |
---|
[de94a60] | 698 | //----------------------------------------------------------------------------- |
---|
| 699 | // Debug |
---|
| 700 | __cfaabi_dbg_debug_do( |
---|
[1997b4e] | 701 | extern "C" { |
---|
[ae66348] | 702 | void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) { |
---|
[1997b4e] | 703 | this.prev_name = prev_name; |
---|
[8fc652e0] | 704 | this.prev_thrd = kernelTLS().this_thread; |
---|
[1997b4e] | 705 | } |
---|
[9181f1d] | 706 | } |
---|
[f7d6bb0] | 707 | ) |
---|
[2026bb6] | 708 | |
---|
| 709 | //----------------------------------------------------------------------------- |
---|
| 710 | // Debug |
---|
[8c50aed] | 711 | bool threading_enabled(void) __attribute__((const)) { |
---|
[2026bb6] | 712 | return true; |
---|
| 713 | } |
---|
[c34ebf2] | 714 | |
---|
| 715 | //----------------------------------------------------------------------------- |
---|
| 716 | // Statistics |
---|
| 717 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 718 | void print_halts( processor & this ) { |
---|
| 719 | this.print_halts = true; |
---|
| 720 | } |
---|
[58688bf] | 721 | |
---|
| 722 | void print_stats_now( cluster & this, int flags ) { |
---|
[1b033b8] | 723 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
---|
| 724 | } |
---|
| 725 | |
---|
| 726 | extern int __print_alarm_stats; |
---|
| 727 | void print_alarm_stats() { |
---|
| 728 | __print_alarm_stats = -1; |
---|
[58688bf] | 729 | } |
---|
[c34ebf2] | 730 | #endif |
---|
[8118303] | 731 | // Local Variables: // |
---|
| 732 | // mode: c // |
---|
| 733 | // tab-width: 4 // |
---|
| 734 | // End: // |
---|