Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/threads/combined/prucpu.c @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #include "primpl.h"
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7
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8 _PRCPU *_pr_primordialCPU = NULL;
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9
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10 PRInt32 _pr_md_idle_cpus; /* number of idle cpus */
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11 /*
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12 * The idle threads in MxN models increment/decrement _pr_md_idle_cpus.
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13 * If _PR_HAVE_ATOMIC_OPS is not defined, they can't use the atomic
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14 * increment/decrement routines (which are based on PR_Lock/PR_Unlock),
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15 * because PR_Lock asserts that the calling thread is not an idle thread.
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16 * So we use a _MDLock to protect _pr_md_idle_cpus.
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17 */
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18 #if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
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19 #ifndef _PR_HAVE_ATOMIC_OPS
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20 static _MDLock _pr_md_idle_cpus_lock;
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21 #endif
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22 #endif
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23 PRUintn _pr_numCPU;
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24 PRInt32 _pr_cpus_exit;
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25 PRUint32 _pr_cpu_affinity_mask = 0;
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26
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27 #if !defined (_PR_GLOBAL_THREADS_ONLY)
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28
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29 static PRUintn _pr_cpuID;
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30
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31 static void PR_CALLBACK _PR_CPU_Idle(void *);
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32
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33 static _PRCPU *_PR_CreateCPU(void);
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34 static PRStatus _PR_StartCPU(_PRCPU *cpu, PRThread *thread);
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35
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36 #if !defined(_PR_LOCAL_THREADS_ONLY)
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37 static void _PR_RunCPU(void *arg);
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38 #endif
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39
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40 void _PR_InitCPUs()
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41 {
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42 PRThread *me = _PR_MD_CURRENT_THREAD();
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43
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44 if (_native_threads_only)
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45 return;
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46
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47 _pr_cpuID = 0;
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48 _MD_NEW_LOCK( &_pr_cpuLock);
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49 #if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
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50 #ifndef _PR_HAVE_ATOMIC_OPS
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51 _MD_NEW_LOCK(&_pr_md_idle_cpus_lock);
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52 #endif
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53 #endif
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54
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55 #ifdef _PR_LOCAL_THREADS_ONLY
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56
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57 #ifdef HAVE_CUSTOM_USER_THREADS
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58 _PR_MD_CREATE_PRIMORDIAL_USER_THREAD(me);
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59 #endif
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60
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61 /* Now start the first CPU. */
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62 _pr_primordialCPU = _PR_CreateCPU();
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63 _pr_numCPU = 1;
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64 _PR_StartCPU(_pr_primordialCPU, me);
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65
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66 _PR_MD_SET_CURRENT_CPU(_pr_primordialCPU);
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67
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68 /* Initialize cpu for current thread (could be different from me) */
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69 _PR_MD_CURRENT_THREAD()->cpu = _pr_primordialCPU;
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70
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71 _PR_MD_SET_LAST_THREAD(me);
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72
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73 #else /* Combined MxN model */
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74
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75 _pr_primordialCPU = _PR_CreateCPU();
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76 _pr_numCPU = 1;
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77 _PR_CreateThread(PR_SYSTEM_THREAD,
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78 _PR_RunCPU,
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79 _pr_primordialCPU,
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80 PR_PRIORITY_NORMAL,
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81 PR_GLOBAL_THREAD,
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82 PR_UNJOINABLE_THREAD,
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83 0,
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84 _PR_IDLE_THREAD);
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85
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86 #endif /* _PR_LOCAL_THREADS_ONLY */
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87
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88 _PR_MD_INIT_CPUS();
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89 }
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90
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91 #ifdef WINNT
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92 /*
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93 * Right now this function merely stops the CPUs and does
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94 * not do any other cleanup.
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95 *
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96 * It is only implemented for WINNT because bug 161998 only
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97 * affects the WINNT version of NSPR, but it would be nice
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98 * to implement this function for other platforms too.
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99 */
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100 void _PR_CleanupCPUs(void)
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101 {
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102 PRUintn i;
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103 PRCList *qp;
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104 _PRCPU *cpu;
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105
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106 _pr_cpus_exit = 1;
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107 for (i = 0; i < _pr_numCPU; i++) {
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108 _PR_MD_WAKEUP_WAITER(NULL);
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109 }
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110 for (qp = _PR_CPUQ().next; qp != &_PR_CPUQ(); qp = qp->next) {
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111 cpu = _PR_CPU_PTR(qp);
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112 _PR_MD_JOIN_THREAD(&cpu->thread->md);
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113 }
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114 }
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115 #endif
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116
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117 static _PRCPUQueue *_PR_CreateCPUQueue(void)
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118 {
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119 PRInt32 index;
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120 _PRCPUQueue *cpuQueue;
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121 cpuQueue = PR_NEWZAP(_PRCPUQueue);
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122
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123 _MD_NEW_LOCK( &cpuQueue->runQLock );
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124 _MD_NEW_LOCK( &cpuQueue->sleepQLock );
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125 _MD_NEW_LOCK( &cpuQueue->miscQLock );
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126
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127 for (index = 0; index < PR_PRIORITY_LAST + 1; index++)
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128 PR_INIT_CLIST( &(cpuQueue->runQ[index]) );
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129 PR_INIT_CLIST( &(cpuQueue->sleepQ) );
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130 PR_INIT_CLIST( &(cpuQueue->pauseQ) );
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131 PR_INIT_CLIST( &(cpuQueue->suspendQ) );
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132 PR_INIT_CLIST( &(cpuQueue->waitingToJoinQ) );
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133
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134 cpuQueue->numCPUs = 1;
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135
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136 return cpuQueue;
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137 }
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138
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139 /*
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140 * Create a new CPU.
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141 *
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142 * This function initializes enough of the _PRCPU structure so
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143 * that it can be accessed safely by a global thread or another
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144 * CPU. This function does not create the native thread that
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145 * will run the CPU nor does it initialize the parts of _PRCPU
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146 * that must be initialized by that native thread.
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147 *
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148 * The reason we cannot simply have the native thread create
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149 * and fully initialize a new CPU is that we need to be able to
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150 * create a usable _pr_primordialCPU in _PR_InitCPUs without
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151 * assuming that the primordial CPU thread we created can run
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152 * during NSPR initialization. For example, on Windows while
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153 * new threads can be created by DllMain, they won't be able
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154 * to run during DLL initialization. If NSPR is initialized
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155 * by DllMain, the primordial CPU thread won't run until DLL
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156 * initialization is finished.
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157 */
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158 static _PRCPU *_PR_CreateCPU(void)
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159 {
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160 _PRCPU *cpu;
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161
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162 cpu = PR_NEWZAP(_PRCPU);
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163 if (cpu) {
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164 cpu->queue = _PR_CreateCPUQueue();
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165 if (!cpu->queue) {
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166 PR_DELETE(cpu);
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167 return NULL;
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168 }
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169 }
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170 return cpu;
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171 }
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172
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173 /*
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174 * Start a new CPU.
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175 *
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176 * 'cpu' is a _PRCPU structure created by _PR_CreateCPU().
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177 * 'thread' is the native thread that will run the CPU.
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178 *
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179 * If this function fails, 'cpu' is destroyed.
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180 */
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181 static PRStatus _PR_StartCPU(_PRCPU *cpu, PRThread *thread)
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182 {
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183 /*
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184 ** Start a new cpu. The assumption this code makes is that the
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185 ** underlying operating system creates a stack to go with the new
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186 ** native thread. That stack will be used by the cpu when pausing.
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187 */
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188
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189 PR_ASSERT(!_native_threads_only);
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190
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191 cpu->last_clock = PR_IntervalNow();
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192
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193 /* Before we create any threads on this CPU we have to
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194 * set the current CPU
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195 */
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196 _PR_MD_SET_CURRENT_CPU(cpu);
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197 _PR_MD_INIT_RUNNING_CPU(cpu);
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198 thread->cpu = cpu;
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199
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200 cpu->idle_thread = _PR_CreateThread(PR_SYSTEM_THREAD,
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201 _PR_CPU_Idle,
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202 (void *)cpu,
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203 PR_PRIORITY_NORMAL,
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204 PR_LOCAL_THREAD,
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205 PR_UNJOINABLE_THREAD,
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206 0,
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207 _PR_IDLE_THREAD);
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208
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209 if (!cpu->idle_thread) {
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210 /* didn't clean up CPU queue XXXMB */
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211 PR_DELETE(cpu);
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212 return PR_FAILURE;
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213 }
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214 PR_ASSERT(cpu->idle_thread->cpu == cpu);
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215
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216 cpu->idle_thread->no_sched = 0;
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217
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218 cpu->thread = thread;
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219
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220 if (_pr_cpu_affinity_mask)
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221 PR_SetThreadAffinityMask(thread, _pr_cpu_affinity_mask);
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222
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223 /* Created and started a new CPU */
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224 _PR_CPU_LIST_LOCK();
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225 cpu->id = _pr_cpuID++;
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226 PR_APPEND_LINK(&cpu->links, &_PR_CPUQ());
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227 _PR_CPU_LIST_UNLOCK();
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228
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229 return PR_SUCCESS;
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230 }
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231
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232 #if !defined(_PR_GLOBAL_THREADS_ONLY) && !defined(_PR_LOCAL_THREADS_ONLY)
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233 /*
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234 ** This code is used during a cpu's initial creation.
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235 */
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236 static void _PR_RunCPU(void *arg)
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237 {
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238 _PRCPU *cpu = (_PRCPU *)arg;
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239 PRThread *me = _PR_MD_CURRENT_THREAD();
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240
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241 PR_ASSERT(NULL != me);
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242
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243 /*
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244 * _PR_StartCPU calls _PR_CreateThread to create the
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245 * idle thread. Because _PR_CreateThread calls PR_Lock,
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246 * the current thread has to remain a global thread
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247 * during the _PR_StartCPU call so that it can wait for
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248 * the lock if the lock is held by another thread. If
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249 * we clear the _PR_GLOBAL_SCOPE flag in
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250 * _PR_MD_CREATE_PRIMORDIAL_THREAD, the current thread
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251 * will be treated as a local thread and have trouble
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252 * waiting for the lock because the CPU is not fully
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253 * constructed yet.
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254 *
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255 * After the CPU is started, it is safe to mark the
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256 * current thread as a local thread.
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257 */
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258
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259 #ifdef HAVE_CUSTOM_USER_THREADS
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260 _PR_MD_CREATE_PRIMORDIAL_USER_THREAD(me);
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261 #endif
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262
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263 me->no_sched = 1;
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264 _PR_StartCPU(cpu, me);
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265
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266 #ifdef HAVE_CUSTOM_USER_THREADS
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267 me->flags &= (~_PR_GLOBAL_SCOPE);
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268 #endif
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269
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270 _PR_MD_SET_CURRENT_CPU(cpu);
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271 _PR_MD_SET_CURRENT_THREAD(cpu->thread);
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272 me->cpu = cpu;
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273
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274 while(1) {
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275 PRInt32 is;
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276 if (!_PR_IS_NATIVE_THREAD(me)) _PR_INTSOFF(is);
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277 _PR_MD_START_INTERRUPTS();
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278 _PR_MD_SWITCH_CONTEXT(me);
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279 }
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280 }
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281 #endif
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282
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283 static void PR_CALLBACK _PR_CPU_Idle(void *_cpu)
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284 {
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285 _PRCPU *cpu = (_PRCPU *)_cpu;
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286 PRThread *me = _PR_MD_CURRENT_THREAD();
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287
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288 PR_ASSERT(NULL != me);
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289
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290 me->cpu = cpu;
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291 cpu->idle_thread = me;
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292 if (_MD_LAST_THREAD())
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293 _MD_LAST_THREAD()->no_sched = 0;
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294 if (!_PR_IS_NATIVE_THREAD(me)) _PR_MD_SET_INTSOFF(0);
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295 while(1) {
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296 PRInt32 is;
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297 PRIntervalTime timeout;
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298 if (!_PR_IS_NATIVE_THREAD(me)) _PR_INTSOFF(is);
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299
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300 _PR_RUNQ_LOCK(cpu);
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301 #if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
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302 #ifdef _PR_HAVE_ATOMIC_OPS
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303 _PR_MD_ATOMIC_INCREMENT(&_pr_md_idle_cpus);
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304 #else
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305 _PR_MD_LOCK(&_pr_md_idle_cpus_lock);
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306 _pr_md_idle_cpus++;
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307 _PR_MD_UNLOCK(&_pr_md_idle_cpus_lock);
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308 #endif /* _PR_HAVE_ATOMIC_OPS */
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309 #endif
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310 /* If someone on runq; do a nonblocking PAUSECPU */
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311 if (_PR_RUNQREADYMASK(me->cpu) != 0) {
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312 _PR_RUNQ_UNLOCK(cpu);
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313 timeout = PR_INTERVAL_NO_WAIT;
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314 } else {
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315 _PR_RUNQ_UNLOCK(cpu);
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316
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317 _PR_SLEEPQ_LOCK(cpu);
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318 if (PR_CLIST_IS_EMPTY(&_PR_SLEEPQ(me->cpu))) {
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319 timeout = PR_INTERVAL_NO_TIMEOUT;
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320 } else {
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321 PRThread *wakeThread;
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322 wakeThread = _PR_THREAD_PTR(_PR_SLEEPQ(me->cpu).next);
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323 timeout = wakeThread->sleep;
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324 }
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325 _PR_SLEEPQ_UNLOCK(cpu);
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326 }
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327
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328 /* Wait for an IO to complete */
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329 (void)_PR_MD_PAUSE_CPU(timeout);
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330
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331 #ifdef WINNT
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332 if (_pr_cpus_exit) {
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333 /* _PR_CleanupCPUs tells us to exit */
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334 _PR_MD_END_THREAD();
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335 }
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336 #endif
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337
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338 #if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
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339 #ifdef _PR_HAVE_ATOMIC_OPS
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340 _PR_MD_ATOMIC_DECREMENT(&_pr_md_idle_cpus);
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341 #else
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342 _PR_MD_LOCK(&_pr_md_idle_cpus_lock);
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343 _pr_md_idle_cpus--;
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344 _PR_MD_UNLOCK(&_pr_md_idle_cpus_lock);
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345 #endif /* _PR_HAVE_ATOMIC_OPS */
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346 #endif
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347
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348 _PR_ClockInterrupt();
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349
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350 /* Now schedule any thread that is on the runq
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351 * INTS must be OFF when calling PR_Schedule()
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352 */
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353 me->state = _PR_RUNNABLE;
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354 _PR_MD_SWITCH_CONTEXT(me);
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355 if (!_PR_IS_NATIVE_THREAD(me)) _PR_FAST_INTSON(is);
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356 }
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357 }
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358 #endif /* _PR_GLOBAL_THREADS_ONLY */
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359
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360 PR_IMPLEMENT(void) PR_SetConcurrency(PRUintn numCPUs)
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diff changeset
361 {
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362 #if defined(_PR_GLOBAL_THREADS_ONLY) || defined(_PR_LOCAL_THREADS_ONLY)
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diff changeset
363
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364 /* do nothing */
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diff changeset
365
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diff changeset
366 #else /* combined, MxN thread model */
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diff changeset
367
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368 PRUintn newCPU;
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diff changeset
369 _PRCPU *cpu;
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diff changeset
370 PRThread *thr;
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diff changeset
371
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diff changeset
372
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Andre Heinecke <andre.heinecke@intevation.de>
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373 if (!_pr_initialized) _PR_ImplicitInitialization();
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diff changeset
374
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Andre Heinecke <andre.heinecke@intevation.de>
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375 if (_native_threads_only)
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376 return;
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diff changeset
377
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diff changeset
378 _PR_CPU_LIST_LOCK();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
379 if (_pr_numCPU < numCPUs) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
380 newCPU = numCPUs - _pr_numCPU;
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parents:
diff changeset
381 _pr_numCPU = numCPUs;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
382 } else newCPU = 0;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
383 _PR_CPU_LIST_UNLOCK();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
diff changeset
384
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
385 for (; newCPU; newCPU--) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
386 cpu = _PR_CreateCPU();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
387 thr = _PR_CreateThread(PR_SYSTEM_THREAD,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
388 _PR_RunCPU,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
389 cpu,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
390 PR_PRIORITY_NORMAL,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
391 PR_GLOBAL_THREAD,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
392 PR_UNJOINABLE_THREAD,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
393 0,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
394 _PR_IDLE_THREAD);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
395 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
396 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
397 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
398
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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399 PR_IMPLEMENT(_PRCPU *) _PR_GetPrimordialCPU(void)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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400 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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401 if (_pr_primordialCPU)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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402 return _pr_primordialCPU;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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403 else
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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404 return _PR_MD_CURRENT_CPU();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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405 }
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