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annotate lib/Support/Threading.cpp @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children 54457678186b
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0
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1 //===-- llvm/Support/Threading.cpp- Control multithreading mode --*- C++ -*-==//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements llvm_start_multithreaded() and friends.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Support/Threading.h"
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15 #include "llvm/Config/config.h"
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16 #include "llvm/Support/Atomic.h"
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17 #include "llvm/Support/Mutex.h"
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18 #include <cassert>
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19
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20 using namespace llvm;
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21
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22 static bool multithreaded_mode = false;
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23
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24 static sys::Mutex* global_lock = 0;
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25
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26 bool llvm::llvm_start_multithreaded() {
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27 #if LLVM_ENABLE_THREADS != 0
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28 assert(!multithreaded_mode && "Already multithreaded!");
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29 multithreaded_mode = true;
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30 global_lock = new sys::Mutex(true);
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31
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32 // We fence here to ensure that all initialization is complete BEFORE we
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33 // return from llvm_start_multithreaded().
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34 sys::MemoryFence();
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35 return true;
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36 #else
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37 return false;
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38 #endif
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39 }
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40
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41 void llvm::llvm_stop_multithreaded() {
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42 #if LLVM_ENABLE_THREADS != 0
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43 assert(multithreaded_mode && "Not currently multithreaded!");
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44
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45 // We fence here to insure that all threaded operations are complete BEFORE we
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46 // return from llvm_stop_multithreaded().
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47 sys::MemoryFence();
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48
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49 multithreaded_mode = false;
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50 delete global_lock;
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51 #endif
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52 }
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53
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54 bool llvm::llvm_is_multithreaded() {
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55 return multithreaded_mode;
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56 }
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57
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58 void llvm::llvm_acquire_global_lock() {
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59 if (multithreaded_mode) global_lock->acquire();
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60 }
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61
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62 void llvm::llvm_release_global_lock() {
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63 if (multithreaded_mode) global_lock->release();
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64 }
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65
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66 #if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H)
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67 #include <pthread.h>
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68
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69 struct ThreadInfo {
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70 void (*UserFn)(void *);
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71 void *UserData;
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72 };
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73 static void *ExecuteOnThread_Dispatch(void *Arg) {
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74 ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
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75 TI->UserFn(TI->UserData);
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76 return 0;
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77 }
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78
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79 void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
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80 unsigned RequestedStackSize) {
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81 ThreadInfo Info = { Fn, UserData };
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82 pthread_attr_t Attr;
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83 pthread_t Thread;
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84
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85 // Construct the attributes object.
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86 if (::pthread_attr_init(&Attr) != 0)
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87 return;
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88
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89 // Set the requested stack size, if given.
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90 if (RequestedStackSize != 0) {
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91 if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
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92 goto error;
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93 }
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94
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95 // Construct and execute the thread.
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96 if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
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97 goto error;
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98
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99 // Wait for the thread and clean up.
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100 ::pthread_join(Thread, 0);
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101
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102 error:
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103 ::pthread_attr_destroy(&Attr);
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104 }
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105 #elif LLVM_ENABLE_THREADS!=0 && defined(LLVM_ON_WIN32)
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106 #include "Windows/Windows.h"
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107 #include <process.h>
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108
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109 struct ThreadInfo {
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110 void (*func)(void*);
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111 void *param;
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112 };
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113
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114 static unsigned __stdcall ThreadCallback(void *param) {
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115 struct ThreadInfo *info = reinterpret_cast<struct ThreadInfo *>(param);
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116 info->func(info->param);
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117
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118 return 0;
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119 }
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120
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121 void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
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122 unsigned RequestedStackSize) {
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123 struct ThreadInfo param = { Fn, UserData };
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124
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125 HANDLE hThread = (HANDLE)::_beginthreadex(NULL,
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126 RequestedStackSize, ThreadCallback,
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127 &param, 0, NULL);
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128
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129 if (hThread) {
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130 // We actually don't care whether the wait succeeds or fails, in
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131 // the same way we don't care whether the pthread_join call succeeds
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132 // or fails. There's not much we could do if this were to fail. But
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133 // on success, this call will wait until the thread finishes executing
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134 // before returning.
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135 (void)::WaitForSingleObject(hThread, INFINITE);
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136 ::CloseHandle(hThread);
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137 }
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138 }
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139 #else
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140 // Support for non-Win32, non-pthread implementation.
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141 void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
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142 unsigned RequestedStackSize) {
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143 (void) RequestedStackSize;
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144 Fn(UserData);
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145 }
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146
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147 #endif