1 | /* thread.h
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2 | *
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3 | * Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005
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4 | * by Larry Wall and others
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5 | *
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6 | * You may distribute under the terms of either the GNU General Public
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7 | * License or the Artistic License, as specified in the README file.
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8 | *
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9 | */
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10 |
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11 | #if defined(USE_5005THREADS) || defined(USE_ITHREADS)
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12 |
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13 | #if defined(VMS)
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14 | #include <builtins.h>
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15 | #endif
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16 |
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17 | #ifdef WIN32
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18 | # include <win32thread.h>
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19 | #else
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20 | #ifdef NETWARE
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21 | # include <nw5thread.h>
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22 | #else
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23 | # ifdef OLD_PTHREADS_API /* Here be dragons. */
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24 | # define DETACH(t) \
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25 | STMT_START { \
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26 | int _eC_; \
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27 | if ((_eC_ = pthread_detach(&(t)->self))) { \
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28 | MUTEX_UNLOCK(&(t)->mutex); \
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29 | Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]", \
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30 | _eC_, __FILE__, __LINE__); \
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31 | } \
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32 | } STMT_END
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33 |
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34 | # define PERL_GET_CONTEXT Perl_get_context()
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35 | # define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)
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36 |
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37 | # define PTHREAD_GETSPECIFIC_INT
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38 | # ifdef DJGPP
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39 | # define pthread_addr_t any_t
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40 | # define NEED_PTHREAD_INIT
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41 | # define PTHREAD_CREATE_JOINABLE (1)
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42 | # endif
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43 | # ifdef __OPEN_VM
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44 | # define pthread_addr_t void *
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45 | # endif
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46 | # ifdef OEMVS
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47 | # define pthread_addr_t void *
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48 | # define pthread_create(t,a,s,d) pthread_create(t,&(a),s,d)
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49 | # define pthread_keycreate pthread_key_create
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50 | # endif
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51 | # ifdef VMS
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52 | # define pthread_attr_init(a) pthread_attr_create(a)
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53 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
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54 | # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
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55 | # define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
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56 | # define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
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57 | # define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
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58 | # endif
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59 | # if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
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60 | # define pthread_attr_init(a) pthread_attr_create(a)
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61 | /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */
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62 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) (0)
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63 | # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
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64 | # define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
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65 | # define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
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66 | # define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
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67 | # endif
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68 | # if defined(DJGPP) || defined(__OPEN_VM) || defined(OEMVS)
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69 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
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70 | # define YIELD pthread_yield(NULL)
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71 | # endif
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72 | # endif
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73 | # if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020
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74 | # define pthread_mutexattr_default NULL
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75 | # define pthread_condattr_default NULL
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76 | # endif
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77 | #endif /* NETWARE */
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78 | #endif
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79 |
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80 | #ifndef PTHREAD_CREATE
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81 | /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
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82 | # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
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83 | #endif
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84 |
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85 | #ifndef PTHREAD_ATTR_SETDETACHSTATE
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86 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
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87 | #endif
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88 |
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89 | #ifndef PTHREAD_CREATE_JOINABLE
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90 | # ifdef OLD_PTHREAD_CREATE_JOINABLE
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91 | # define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
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92 | # else
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93 | # define PTHREAD_CREATE_JOINABLE 0 /* Panic? No, guess. */
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94 | # endif
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95 | #endif
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96 |
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97 | #ifdef DGUX
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98 | # define THREAD_CREATE_NEEDS_STACK (32*1024)
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99 | #endif
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100 |
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101 | #ifdef I_MACH_CTHREADS
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102 |
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103 | /* cthreads interface */
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104 |
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105 | /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
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106 |
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107 | #define MUTEX_INIT(m) \
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108 | STMT_START { \
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109 | *m = mutex_alloc(); \
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110 | if (*m) { \
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111 | mutex_init(*m); \
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112 | } else { \
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113 | Perl_croak_nocontext("panic: MUTEX_INIT [%s:%d]", \
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114 | __FILE__, __LINE__); \
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115 | } \
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116 | } STMT_END
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117 |
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118 | #define MUTEX_LOCK(m) mutex_lock(*m)
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119 | #define MUTEX_UNLOCK(m) mutex_unlock(*m)
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120 | #define MUTEX_DESTROY(m) \
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121 | STMT_START { \
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122 | mutex_free(*m); \
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123 | *m = 0; \
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124 | } STMT_END
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125 |
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126 | #define COND_INIT(c) \
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127 | STMT_START { \
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128 | *c = condition_alloc(); \
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129 | if (*c) { \
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130 | condition_init(*c); \
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131 | } \
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132 | else { \
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133 | Perl_croak_nocontext("panic: COND_INIT [%s:%d]", \
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134 | __FILE__, __LINE__); \
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135 | } \
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136 | } STMT_END
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137 |
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138 | #define COND_SIGNAL(c) condition_signal(*c)
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139 | #define COND_BROADCAST(c) condition_broadcast(*c)
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140 | #define COND_WAIT(c, m) condition_wait(*c, *m)
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141 | #define COND_DESTROY(c) \
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142 | STMT_START { \
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143 | condition_free(*c); \
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144 | *c = 0; \
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145 | } STMT_END
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146 |
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147 | #define THREAD_CREATE(thr, f) (thr->self = cthread_fork(f, thr), 0)
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148 | #define THREAD_POST_CREATE(thr)
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149 |
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150 | #define THREAD_RET_TYPE any_t
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151 | #define THREAD_RET_CAST(x) ((any_t) x)
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152 |
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153 | #define DETACH(t) cthread_detach(t->self)
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154 | #define JOIN(t, avp) (*(avp) = (AV *)cthread_join(t->self))
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155 |
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156 | #define PERL_SET_CONTEXT(t) cthread_set_data(cthread_self(), t)
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157 | #define PERL_GET_CONTEXT cthread_data(cthread_self())
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158 |
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159 | #define INIT_THREADS cthread_init()
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160 | #define YIELD cthread_yield()
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161 | #define ALLOC_THREAD_KEY NOOP
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162 | #define FREE_THREAD_KEY NOOP
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163 | #define SET_THREAD_SELF(thr) (thr->self = cthread_self())
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164 |
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165 | #endif /* I_MACH_CTHREADS */
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166 |
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167 | #ifndef YIELD
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168 | # ifdef SCHED_YIELD
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169 | # define YIELD SCHED_YIELD
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170 | # else
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171 | # ifdef HAS_SCHED_YIELD
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172 | # define YIELD sched_yield()
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173 | # else
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174 | # ifdef HAS_PTHREAD_YIELD
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175 | /* pthread_yield(NULL) platforms are expected
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176 | * to have #defined YIELD for themselves. */
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177 | # define YIELD pthread_yield()
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178 | # endif
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179 | # endif
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180 | # endif
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181 | #endif
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182 |
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183 | #ifdef __hpux
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184 | # define MUTEX_INIT_NEEDS_MUTEX_ZEROED
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185 | #endif
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186 |
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187 | #ifndef MUTEX_INIT
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188 |
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189 | # ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
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190 | /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
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191 | # define MUTEX_INIT(m) \
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192 | STMT_START { \
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193 | int _eC_; \
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194 | Zero((m), 1, perl_mutex); \
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195 | if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
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196 | Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
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197 | _eC_, __FILE__, __LINE__); \
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198 | } STMT_END
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199 | # else
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200 | # define MUTEX_INIT(m) \
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201 | STMT_START { \
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202 | int _eC_; \
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203 | if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
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204 | Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
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205 | _eC_, __FILE__, __LINE__); \
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206 | } STMT_END
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207 | # endif
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208 |
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209 | # define MUTEX_LOCK(m) \
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210 | STMT_START { \
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211 | int _eC_; \
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212 | if ((_eC_ = pthread_mutex_lock((m)))) \
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213 | Perl_croak_nocontext("panic: MUTEX_LOCK (%d) [%s:%d]", \
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214 | _eC_, __FILE__, __LINE__); \
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215 | } STMT_END
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216 |
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217 | # define MUTEX_UNLOCK(m) \
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218 | STMT_START { \
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219 | int _eC_; \
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220 | if ((_eC_ = pthread_mutex_unlock((m)))) \
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221 | Perl_croak_nocontext("panic: MUTEX_UNLOCK (%d) [%s:%d]", \
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222 | _eC_, __FILE__, __LINE__); \
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223 | } STMT_END
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224 |
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225 | # define MUTEX_DESTROY(m) \
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226 | STMT_START { \
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227 | int _eC_; \
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228 | if ((_eC_ = pthread_mutex_destroy((m)))) \
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229 | Perl_croak_nocontext("panic: MUTEX_DESTROY (%d) [%s:%d]", \
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230 | _eC_, __FILE__, __LINE__); \
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231 | } STMT_END
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232 | #endif /* MUTEX_INIT */
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233 |
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234 | #ifndef COND_INIT
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235 | # define COND_INIT(c) \
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236 | STMT_START { \
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237 | int _eC_; \
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238 | if ((_eC_ = pthread_cond_init((c), pthread_condattr_default))) \
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239 | Perl_croak_nocontext("panic: COND_INIT (%d) [%s:%d]", \
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240 | _eC_, __FILE__, __LINE__); \
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241 | } STMT_END
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242 |
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243 | # define COND_SIGNAL(c) \
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244 | STMT_START { \
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245 | int _eC_; \
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246 | if ((_eC_ = pthread_cond_signal((c)))) \
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247 | Perl_croak_nocontext("panic: COND_SIGNAL (%d) [%s:%d]", \
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248 | _eC_, __FILE__, __LINE__); \
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249 | } STMT_END
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250 |
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251 | # define COND_BROADCAST(c) \
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252 | STMT_START { \
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253 | int _eC_; \
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254 | if ((_eC_ = pthread_cond_broadcast((c)))) \
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255 | Perl_croak_nocontext("panic: COND_BROADCAST (%d) [%s:%d]", \
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256 | _eC_, __FILE__, __LINE__); \
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257 | } STMT_END
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258 |
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259 | # define COND_WAIT(c, m) \
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260 | STMT_START { \
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261 | int _eC_; \
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262 | if ((_eC_ = pthread_cond_wait((c), (m)))) \
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263 | Perl_croak_nocontext("panic: COND_WAIT (%d) [%s:%d]", \
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264 | _eC_, __FILE__, __LINE__); \
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265 | } STMT_END
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266 |
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267 | # define COND_DESTROY(c) \
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268 | STMT_START { \
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269 | int _eC_; \
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270 | if ((_eC_ = pthread_cond_destroy((c)))) \
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271 | Perl_croak_nocontext("panic: COND_DESTROY (%d) [%s:%d]", \
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272 | _eC_, __FILE__, __LINE__); \
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273 | } STMT_END
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274 | #endif /* COND_INIT */
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275 |
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276 | /* DETACH(t) must only be called while holding t->mutex */
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277 | #ifndef DETACH
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278 | # define DETACH(t) \
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279 | STMT_START { \
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280 | int _eC_; \
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281 | if ((_eC_ = pthread_detach((t)->self))) { \
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282 | MUTEX_UNLOCK(&(t)->mutex); \
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283 | Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]", \
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284 | _eC_, __FILE__, __LINE__); \
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285 | } \
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286 | } STMT_END
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287 | #endif /* DETACH */
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288 |
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289 | #ifndef JOIN
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290 | # define JOIN(t, avp) \
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291 | STMT_START { \
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292 | int _eC_; \
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293 | if ((_eC_ = pthread_join((t)->self, (void**)(avp)))) \
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294 | Perl_croak_nocontext("panic: pthread_join (%d) [%s:%d]", \
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295 | _eC_, __FILE__, __LINE__); \
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296 | } STMT_END
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297 | #endif /* JOIN */
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298 |
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299 | /* Use an unchecked fetch of thread-specific data instead of a checked one.
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300 | * It would fail if the key were bogus, but if the key were bogus then
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301 | * Really Bad Things would be happening anyway. --dan */
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302 | #if (defined(__ALPHA) && (__VMS_VER >= 70000000)) || \
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303 | (defined(__alpha) && defined(__osf__) && !defined(__GNUC__)) /* Available only on >= 4.0 */
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304 | # define HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP /* Configure test needed */
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305 | #endif
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306 |
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307 | #ifdef HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP
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308 | # define PTHREAD_GETSPECIFIC(key) pthread_unchecked_getspecific_np(key)
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309 | #else
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310 | # define PTHREAD_GETSPECIFIC(key) pthread_getspecific(key)
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311 | #endif
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312 |
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313 | #ifndef PERL_GET_CONTEXT
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314 | # define PERL_GET_CONTEXT PTHREAD_GETSPECIFIC(PL_thr_key)
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315 | #endif
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316 |
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317 | #ifndef PERL_SET_CONTEXT
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318 | # define PERL_SET_CONTEXT(t) \
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319 | STMT_START { \
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320 | int _eC_; \
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321 | if ((_eC_ = pthread_setspecific(PL_thr_key, (void *)(t)))) \
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322 | Perl_croak_nocontext("panic: pthread_setspecific (%d) [%s:%d]", \
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323 | _eC_, __FILE__, __LINE__); \
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324 | } STMT_END
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325 | #endif /* PERL_SET_CONTEXT */
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326 |
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327 | #ifndef INIT_THREADS
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328 | # ifdef NEED_PTHREAD_INIT
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329 | # define INIT_THREADS pthread_init()
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330 | # endif
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331 | #endif
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332 |
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333 | #ifndef ALLOC_THREAD_KEY
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334 | # define ALLOC_THREAD_KEY \
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335 | STMT_START { \
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336 | int _eC_; \
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337 | if ((_eC_ = pthread_key_create(&PL_thr_key, 0))) { \
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338 | write(2, "panic: pthread_key_create failed\n", 33); \
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339 | exit(1); \
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340 | } \
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341 | } STMT_END
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342 | #endif
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343 |
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344 | #ifndef FREE_THREAD_KEY
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345 | # define FREE_THREAD_KEY \
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346 | STMT_START { \
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347 | pthread_key_delete(PL_thr_key); \
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348 | } STMT_END
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349 | #endif
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350 |
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351 | #ifndef PTHREAD_ATFORK
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352 | # ifdef HAS_PTHREAD_ATFORK
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353 | # define PTHREAD_ATFORK(prepare,parent,child) \
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354 | pthread_atfork(prepare,parent,child)
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355 | # else
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356 | # define PTHREAD_ATFORK(prepare,parent,child) \
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357 | NOOP
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358 | # endif
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359 | #endif
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360 |
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361 | #ifndef THREAD_RET_TYPE
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362 | # define THREAD_RET_TYPE void *
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363 | # define THREAD_RET_CAST(p) ((void *)(p))
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364 | #endif /* THREAD_RET */
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365 |
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366 | #if defined(USE_5005THREADS)
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367 |
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368 | /* Accessor for per-thread SVs */
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369 | # define THREADSV(i) (thr->threadsvp[i])
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370 |
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371 | /*
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372 | * LOCK_SV_MUTEX and UNLOCK_SV_MUTEX are performance-critical. Here, we
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373 | * try only locking them if there may be more than one thread in existence.
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374 | * Systems with very fast mutexes (and/or slow conditionals) may wish to
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375 | * remove the "if (threadnum) ..." test.
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376 | * XXX do NOT use C<if (PL_threadnum) ...> -- it sets up race conditions!
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377 | */
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378 | # define LOCK_SV_MUTEX MUTEX_LOCK(&PL_sv_mutex)
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379 | # define UNLOCK_SV_MUTEX MUTEX_UNLOCK(&PL_sv_mutex)
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380 | # define LOCK_STRTAB_MUTEX MUTEX_LOCK(&PL_strtab_mutex)
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381 | # define UNLOCK_STRTAB_MUTEX MUTEX_UNLOCK(&PL_strtab_mutex)
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382 | # define LOCK_CRED_MUTEX MUTEX_LOCK(&PL_cred_mutex)
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383 | # define UNLOCK_CRED_MUTEX MUTEX_UNLOCK(&PL_cred_mutex)
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384 | # define LOCK_FDPID_MUTEX MUTEX_LOCK(&PL_fdpid_mutex)
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385 | # define UNLOCK_FDPID_MUTEX MUTEX_UNLOCK(&PL_fdpid_mutex)
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386 | # define LOCK_SV_LOCK_MUTEX MUTEX_LOCK(&PL_sv_lock_mutex)
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387 | # define UNLOCK_SV_LOCK_MUTEX MUTEX_UNLOCK(&PL_sv_lock_mutex)
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388 |
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389 | /* Values and macros for thr->flags */
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390 | #define THRf_STATE_MASK 7
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391 | #define THRf_R_JOINABLE 0
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392 | #define THRf_R_JOINED 1
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393 | #define THRf_R_DETACHED 2
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394 | #define THRf_ZOMBIE 3
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395 | #define THRf_DEAD 4
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396 |
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397 | #define THRf_DID_DIE 8
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398 |
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399 | /* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */
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400 | #define ThrSTATE(t) ((t)->flags & THRf_STATE_MASK)
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401 | #define ThrSETSTATE(t, s) STMT_START { \
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402 | (t)->flags &= ~THRf_STATE_MASK; \
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403 | (t)->flags |= (s); \
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404 | DEBUG_S(PerlIO_printf(Perl_debug_log, \
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405 | "thread %p set to state %d\n", (t), (s))); \
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406 | } STMT_END
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407 |
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408 | typedef struct condpair {
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409 | perl_mutex mutex; /* Protects all other fields */
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410 | perl_cond owner_cond; /* For when owner changes at all */
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411 | perl_cond cond; /* For cond_signal and cond_broadcast */
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412 | Thread owner; /* Currently owning thread */
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413 | } condpair_t;
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414 |
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415 | #define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex)
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416 | #define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond)
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417 | #define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond)
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418 | #define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner
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419 |
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420 | #endif /* USE_5005THREADS */
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421 |
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422 | # define LOCK_DOLLARZERO_MUTEX MUTEX_LOCK(&PL_dollarzero_mutex)
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423 | # define UNLOCK_DOLLARZERO_MUTEX MUTEX_UNLOCK(&PL_dollarzero_mutex)
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424 |
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425 | #endif /* USE_5005THREADS || USE_ITHREADS */
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426 |
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427 | #ifndef MUTEX_LOCK
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428 | # define MUTEX_LOCK(m)
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429 | #endif
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430 |
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431 | #ifndef MUTEX_UNLOCK
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432 | # define MUTEX_UNLOCK(m)
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433 | #endif
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434 |
|
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435 | #ifndef MUTEX_INIT
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436 | # define MUTEX_INIT(m)
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437 | #endif
|
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438 |
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439 | #ifndef MUTEX_DESTROY
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440 | # define MUTEX_DESTROY(m)
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441 | #endif
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442 |
|
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443 | #ifndef COND_INIT
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444 | # define COND_INIT(c)
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445 | #endif
|
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446 |
|
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447 | #ifndef COND_SIGNAL
|
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448 | # define COND_SIGNAL(c)
|
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449 | #endif
|
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450 |
|
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451 | #ifndef COND_BROADCAST
|
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452 | # define COND_BROADCAST(c)
|
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453 | #endif
|
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454 |
|
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455 | #ifndef COND_WAIT
|
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456 | # define COND_WAIT(c, m)
|
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457 | #endif
|
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458 |
|
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459 | #ifndef COND_DESTROY
|
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460 | # define COND_DESTROY(c)
|
---|
461 | #endif
|
---|
462 |
|
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463 | #ifndef LOCK_SV_MUTEX
|
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464 | # define LOCK_SV_MUTEX
|
---|
465 | #endif
|
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466 |
|
---|
467 | #ifndef UNLOCK_SV_MUTEX
|
---|
468 | # define UNLOCK_SV_MUTEX
|
---|
469 | #endif
|
---|
470 |
|
---|
471 | #ifndef LOCK_STRTAB_MUTEX
|
---|
472 | # define LOCK_STRTAB_MUTEX
|
---|
473 | #endif
|
---|
474 |
|
---|
475 | #ifndef UNLOCK_STRTAB_MUTEX
|
---|
476 | # define UNLOCK_STRTAB_MUTEX
|
---|
477 | #endif
|
---|
478 |
|
---|
479 | #ifndef LOCK_CRED_MUTEX
|
---|
480 | # define LOCK_CRED_MUTEX
|
---|
481 | #endif
|
---|
482 |
|
---|
483 | #ifndef UNLOCK_CRED_MUTEX
|
---|
484 | # define UNLOCK_CRED_MUTEX
|
---|
485 | #endif
|
---|
486 |
|
---|
487 | #ifndef LOCK_FDPID_MUTEX
|
---|
488 | # define LOCK_FDPID_MUTEX
|
---|
489 | #endif
|
---|
490 |
|
---|
491 | #ifndef UNLOCK_FDPID_MUTEX
|
---|
492 | # define UNLOCK_FDPID_MUTEX
|
---|
493 | #endif
|
---|
494 |
|
---|
495 | #ifndef LOCK_SV_LOCK_MUTEX
|
---|
496 | # define LOCK_SV_LOCK_MUTEX
|
---|
497 | #endif
|
---|
498 |
|
---|
499 | #ifndef UNLOCK_SV_LOCK_MUTEX
|
---|
500 | # define UNLOCK_SV_LOCK_MUTEX
|
---|
501 | #endif
|
---|
502 |
|
---|
503 | #ifndef LOCK_DOLLARZERO_MUTEX
|
---|
504 | # define LOCK_DOLLARZERO_MUTEX
|
---|
505 | #endif
|
---|
506 |
|
---|
507 | #ifndef UNLOCK_DOLLARZERO_MUTEX
|
---|
508 | # define UNLOCK_DOLLARZERO_MUTEX
|
---|
509 | #endif
|
---|
510 |
|
---|
511 | /* THR, SET_THR, and dTHR are there for compatibility with old versions */
|
---|
512 | #ifndef THR
|
---|
513 | # define THR PERL_GET_THX
|
---|
514 | #endif
|
---|
515 |
|
---|
516 | #ifndef SET_THR
|
---|
517 | # define SET_THR(t) PERL_SET_THX(t)
|
---|
518 | #endif
|
---|
519 |
|
---|
520 | #ifndef dTHR
|
---|
521 | # define dTHR dNOOP
|
---|
522 | #endif
|
---|
523 |
|
---|
524 | #ifndef INIT_THREADS
|
---|
525 | # define INIT_THREADS NOOP
|
---|
526 | #endif
|
---|