Mercurial > repo
annotate perl-5.22.2/win32/win32thread.h @ 8045:a16537d2fe07
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author | HackBot |
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date | Sat, 14 May 2016 14:54:38 +0000 |
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rev | line source |
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8045
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1 #ifndef _WIN32THREAD_H |
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2 #define _WIN32THREAD_H |
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3 |
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4 #include "win32.h" |
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5 |
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6 typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond; |
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7 typedef DWORD perl_key; |
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8 typedef HANDLE perl_os_thread; |
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9 |
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10 #ifndef DONT_USE_CRITICAL_SECTION |
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11 |
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12 /* Critical Sections used instead of mutexes: lightweight, |
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13 * but can't be communicated to child processes, and can't get |
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14 * HANDLE to it for use elsewhere. |
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15 */ |
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16 typedef CRITICAL_SECTION perl_mutex; |
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17 #define MUTEX_INIT(m) InitializeCriticalSection(m) |
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18 #define MUTEX_LOCK(m) EnterCriticalSection(m) |
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19 #define MUTEX_UNLOCK(m) LeaveCriticalSection(m) |
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20 #define MUTEX_DESTROY(m) DeleteCriticalSection(m) |
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21 |
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22 #else |
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23 |
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24 typedef HANDLE perl_mutex; |
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25 # define MUTEX_INIT(m) \ |
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26 STMT_START { \ |
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27 if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL) \ |
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28 Perl_croak_nocontext("panic: MUTEX_INIT"); \ |
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29 } STMT_END |
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30 |
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31 # define MUTEX_LOCK(m) \ |
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32 STMT_START { \ |
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33 if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED) \ |
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34 Perl_croak_nocontext("panic: MUTEX_LOCK"); \ |
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35 } STMT_END |
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36 |
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37 # define MUTEX_UNLOCK(m) \ |
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38 STMT_START { \ |
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39 if (ReleaseMutex(*(m)) == 0) \ |
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40 Perl_croak_nocontext("panic: MUTEX_UNLOCK"); \ |
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41 } STMT_END |
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42 |
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43 # define MUTEX_DESTROY(m) \ |
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44 STMT_START { \ |
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45 if (CloseHandle(*(m)) == 0) \ |
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46 Perl_croak_nocontext("panic: MUTEX_DESTROY"); \ |
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47 } STMT_END |
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48 |
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49 #endif |
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50 |
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51 /* These macros assume that the mutex associated with the condition |
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52 * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY}, |
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53 * so there's no separate mutex protecting access to (c)->waiters |
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54 */ |
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55 #define COND_INIT(c) \ |
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56 STMT_START { \ |
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57 (c)->waiters = 0; \ |
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58 (c)->sem = Win_CreateSemaphore(NULL,0,LONG_MAX,NULL); \ |
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59 if ((c)->sem == NULL) \ |
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60 Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError()); \ |
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61 } STMT_END |
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62 |
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63 #define COND_SIGNAL(c) \ |
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64 STMT_START { \ |
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65 if ((c)->waiters > 0 && \ |
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66 ReleaseSemaphore((c)->sem,1,NULL) == 0) \ |
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67 Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError()); \ |
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68 } STMT_END |
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69 |
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70 #define COND_BROADCAST(c) \ |
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71 STMT_START { \ |
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72 if ((c)->waiters > 0 && \ |
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73 ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0) \ |
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74 Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\ |
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75 } STMT_END |
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76 |
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77 #define COND_WAIT(c, m) \ |
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78 STMT_START { \ |
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79 (c)->waiters++; \ |
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80 MUTEX_UNLOCK(m); \ |
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81 /* Note that there's no race here, since a \ |
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82 * COND_BROADCAST() on another thread will have seen the\ |
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83 * right number of waiters (i.e. including this one) */ \ |
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84 if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\ |
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85 Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError()); \ |
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86 /* XXX there may be an inconsequential race here */ \ |
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87 MUTEX_LOCK(m); \ |
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88 (c)->waiters--; \ |
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89 } STMT_END |
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90 |
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91 #define COND_DESTROY(c) \ |
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92 STMT_START { \ |
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93 (c)->waiters = 0; \ |
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94 if (CloseHandle((c)->sem) == 0) \ |
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95 Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError()); \ |
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96 } STMT_END |
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97 |
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98 #define DETACH(t) \ |
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99 STMT_START { \ |
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100 if (CloseHandle((t)->self) == 0) { \ |
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101 MUTEX_UNLOCK(&(t)->mutex); \ |
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102 Perl_croak_nocontext("panic: DETACH"); \ |
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103 } \ |
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104 } STMT_END |
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105 |
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106 |
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107 #define THREAD_CREATE(t, f) Perl_thread_create(t, f) |
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108 #define THREAD_POST_CREATE(t) NOOP |
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109 |
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110 /* XXX Docs mention that the RTL versions of thread creation routines |
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111 * should be used, but that advice only seems applicable when the RTL |
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112 * is not in a DLL. RTL DLLs seem to do all of the init/deinit required |
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113 * upon DLL_THREAD_ATTACH/DETACH. So we seem to be completely safe using |
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114 * straight Win32 API calls, rather than the much braindamaged RTL calls. |
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115 * |
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116 * _beginthread() in the RTLs call CloseHandle() just after the thread |
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117 * function returns, which means: 1) we have a race on our hands |
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118 * 2) it is impossible to implement join() semantics. |
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119 * |
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120 * IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here |
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121 * for experimental purposes only. GSAR 98-01-02 |
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122 */ |
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123 #ifdef USE_RTL_THREAD_API |
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124 # include <process.h> |
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125 # if defined (_MSC_VER) |
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126 # define THREAD_RET_TYPE unsigned __stdcall |
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127 # define THREAD_RET_CAST(p) ((unsigned)(p)) |
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128 # else |
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129 /* CRTDLL.DLL doesn't allow a return value from thread function! */ |
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130 # define THREAD_RET_TYPE void __cdecl |
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131 # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
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132 # endif |
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133 #else /* !USE_RTL_THREAD_API */ |
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134 # define THREAD_RET_TYPE DWORD WINAPI |
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135 # define THREAD_RET_CAST(p) ((DWORD)(p)) |
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136 #endif /* !USE_RTL_THREAD_API */ |
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137 |
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138 typedef THREAD_RET_TYPE thread_func_t(void *); |
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139 |
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140 |
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141 START_EXTERN_C |
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142 |
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143 #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) |
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144 extern __declspec(thread) void *PL_current_context; |
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145 #define PERL_SET_CONTEXT(t) (PL_current_context = t) |
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146 #define PERL_GET_CONTEXT PL_current_context |
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147 #else |
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148 #define PERL_GET_CONTEXT Perl_get_context() |
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149 #define PERL_SET_CONTEXT(t) Perl_set_context(t) |
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150 #endif |
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151 |
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152 END_EXTERN_C |
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153 |
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154 #define INIT_THREADS NOOP |
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155 #define ALLOC_THREAD_KEY \ |
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156 STMT_START { \ |
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157 if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) { \ |
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158 PerlIO_printf(PerlIO_stderr(),"panic: TlsAlloc"); \ |
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159 exit(1); \ |
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160 } \ |
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161 } STMT_END |
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162 |
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163 #define FREE_THREAD_KEY \ |
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164 STMT_START { \ |
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165 TlsFree(PL_thr_key); \ |
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166 } STMT_END |
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167 |
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168 #define PTHREAD_ATFORK(prepare,parent,child) NOOP |
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169 |
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170 #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER) |
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171 #define JOIN(t, avp) \ |
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172 STMT_START { \ |
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173 if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ |
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174 || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ |
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175 || (CloseHandle((t)->self) == 0)) \ |
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176 Perl_croak_nocontext("panic: JOIN"); \ |
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177 *avp = (AV *)((t)->i.retv); \ |
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178 } STMT_END |
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179 #else /* !USE_RTL_THREAD_API || _MSC_VER */ |
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180 #define JOIN(t, avp) \ |
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181 STMT_START { \ |
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182 if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ |
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183 || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ |
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184 || (CloseHandle((t)->self) == 0)) \ |
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185 Perl_croak_nocontext("panic: JOIN"); \ |
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186 } STMT_END |
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187 #endif /* !USE_RTL_THREAD_API || _MSC_VER */ |
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188 |
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189 #define YIELD Sleep(0) |
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190 |
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191 #endif /* _WIN32THREAD_H */ |
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192 |