Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/threads/combined/prustack.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +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 /* List of free stack virtual memory chunks */
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9 PRLock *_pr_stackLock;
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10 PRCList _pr_freeStacks = PR_INIT_STATIC_CLIST(&_pr_freeStacks);
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11 PRIntn _pr_numFreeStacks;
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12 PRIntn _pr_maxFreeStacks = 4;
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13
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14 #ifdef DEBUG
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15 /*
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16 ** A variable that can be set via the debugger...
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17 */
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18 PRBool _pr_debugStacks = PR_FALSE;
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19 #endif
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20
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21 /* How much space to leave between the stacks, at each end */
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22 #define REDZONE (2 << _pr_pageShift)
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23
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24 #define _PR_THREAD_STACK_PTR(_qp) \
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25 ((PRThreadStack*) ((char*) (_qp) - offsetof(PRThreadStack,links)))
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26
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27 void _PR_InitStacks(void)
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28 {
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29 _pr_stackLock = PR_NewLock();
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30 }
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31
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32 void _PR_CleanupStacks(void)
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33 {
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34 if (_pr_stackLock) {
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35 PR_DestroyLock(_pr_stackLock);
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36 _pr_stackLock = NULL;
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37 }
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38 }
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39
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40 /*
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41 ** Allocate a stack for a thread.
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42 */
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43 PRThreadStack *_PR_NewStack(PRUint32 stackSize)
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44 {
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45 PRCList *qp;
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46 PRThreadStack *ts;
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47 PRThread *thr;
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48
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49 /*
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50 ** Trim the list of free stacks. Trim it backwards, tossing out the
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51 ** oldest stack found first (this way more recent stacks have a
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52 ** chance of being present in the data cache).
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53 */
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54 PR_Lock(_pr_stackLock);
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55 qp = _pr_freeStacks.prev;
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56 while ((_pr_numFreeStacks > _pr_maxFreeStacks) && (qp != &_pr_freeStacks)) {
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57 ts = _PR_THREAD_STACK_PTR(qp);
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58 thr = _PR_THREAD_STACK_TO_PTR(ts);
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59 qp = qp->prev;
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60 /*
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61 * skip stacks which are still being used
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62 */
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63 if (thr->no_sched)
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64 continue;
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65 PR_REMOVE_LINK(&ts->links);
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66
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67 /* Give platform OS to clear out the stack for debugging */
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68 _PR_MD_CLEAR_STACK(ts);
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69
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70 _pr_numFreeStacks--;
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71 _PR_DestroySegment(ts->seg);
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72 PR_DELETE(ts);
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73 }
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74
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75 /*
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76 ** Find a free thread stack. This searches the list of free'd up
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77 ** virtually mapped thread stacks.
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78 */
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79 qp = _pr_freeStacks.next;
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80 ts = 0;
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81 while (qp != &_pr_freeStacks) {
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82 ts = _PR_THREAD_STACK_PTR(qp);
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83 thr = _PR_THREAD_STACK_TO_PTR(ts);
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84 qp = qp->next;
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85 /*
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86 * skip stacks which are still being used
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87 */
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88 if ((!(thr->no_sched)) && ((ts->allocSize - 2*REDZONE) >= stackSize)) {
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89 /*
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90 ** Found a stack that is not in use and is big enough. Change
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91 ** stackSize to fit it.
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92 */
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93 stackSize = ts->allocSize - 2*REDZONE;
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94 PR_REMOVE_LINK(&ts->links);
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95 _pr_numFreeStacks--;
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96 ts->links.next = 0;
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97 ts->links.prev = 0;
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98 PR_Unlock(_pr_stackLock);
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99 goto done;
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100 }
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101 ts = 0;
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102 }
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103 PR_Unlock(_pr_stackLock);
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104
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105 if (!ts) {
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106 /* Make a new thread stack object. */
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107 ts = PR_NEWZAP(PRThreadStack);
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108 if (!ts) {
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109 return NULL;
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110 }
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111
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112 /*
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113 ** Assign some of the virtual space to the new stack object. We
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114 ** may not get that piece of VM, but if nothing else we will
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115 ** advance the pointer so we don't collide (unless the OS screws
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116 ** up).
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117 */
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118 ts->allocSize = stackSize + 2*REDZONE;
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119 ts->seg = _PR_NewSegment(ts->allocSize, 0);
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120 if (!ts->seg) {
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121 PR_DELETE(ts);
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122 return NULL;
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123 }
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124 }
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125
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126 done:
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127 ts->allocBase = (char*)ts->seg->vaddr;
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128 ts->flags = _PR_STACK_MAPPED;
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129 ts->stackSize = stackSize;
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130
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131 #ifdef HAVE_STACK_GROWING_UP
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132 ts->stackTop = ts->allocBase + REDZONE;
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133 ts->stackBottom = ts->stackTop + stackSize;
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134 #else
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135 ts->stackBottom = ts->allocBase + REDZONE;
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136 ts->stackTop = ts->stackBottom + stackSize;
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137 #endif
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138
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139 PR_LOG(_pr_thread_lm, PR_LOG_NOTICE,
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140 ("thread stack: base=0x%x limit=0x%x bottom=0x%x top=0x%x\n",
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141 ts->allocBase, ts->allocBase + ts->allocSize - 1,
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142 ts->allocBase + REDZONE,
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143 ts->allocBase + REDZONE + stackSize - 1));
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144
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145 _PR_MD_INIT_STACK(ts,REDZONE);
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146
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147 return ts;
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148 }
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149
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150 /*
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151 ** Free the stack for the current thread
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152 */
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153 void _PR_FreeStack(PRThreadStack *ts)
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154 {
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155 if (!ts) {
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156 return;
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157 }
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158 if (ts->flags & _PR_STACK_PRIMORDIAL) {
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159 PR_DELETE(ts);
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160 return;
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161 }
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162
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163 /*
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164 ** Put the stack on the free list. This is done because we are still
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165 ** using the stack. Next time a thread is created we will trim the
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166 ** list down; it's safe to do it then because we will have had to
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167 ** context switch to a live stack before another thread can be
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168 ** created.
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169 */
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170 PR_Lock(_pr_stackLock);
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171 PR_APPEND_LINK(&ts->links, _pr_freeStacks.prev);
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172 _pr_numFreeStacks++;
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173 PR_Unlock(_pr_stackLock);
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174 }
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