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 = 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 in both Borland and VC seem to do all of |
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113 | * the init/deinit required upon DLL_THREAD_ATTACH/DETACH. So we seem |
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114 | * to be completely safe using straight Win32 API calls, rather than |
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115 | * the much braindamaged RTL calls. |
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116 | * |
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117 | * _beginthread() in the RTLs call CloseHandle() just after the thread |
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118 | * function returns, which means: 1) we have a race on our hands |
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119 | * 2) it is impossible to implement join() semantics. |
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120 | * |
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121 | * IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here |
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122 | * for experimental purposes only. GSAR 98-01-02 |
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123 | */ |
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124 | #ifdef USE_RTL_THREAD_API |
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125 | # include <process.h> |
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126 | # if defined(__BORLANDC__) |
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127 | /* Borland RTL doesn't allow a return value from thread function! */ |
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128 | # define THREAD_RET_TYPE void _USERENTRY |
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129 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
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130 | # elif defined (_MSC_VER) |
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131 | # define THREAD_RET_TYPE unsigned __stdcall |
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132 | # define THREAD_RET_CAST(p) ((unsigned)(p)) |
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133 | # else |
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134 | /* CRTDLL.DLL doesn't allow a return value from thread function! */ |
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135 | # define THREAD_RET_TYPE void __cdecl |
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136 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
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137 | # endif |
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138 | #else /* !USE_RTL_THREAD_API */ |
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139 | # define THREAD_RET_TYPE DWORD WINAPI |
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140 | # define THREAD_RET_CAST(p) ((DWORD)(p)) |
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141 | #endif /* !USE_RTL_THREAD_API */ |
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142 | |
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143 | typedef THREAD_RET_TYPE thread_func_t(void *); |
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144 | |
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145 | |
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146 | START_EXTERN_C |
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147 | |
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148 | #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL)) |
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149 | extern __declspec(thread) void *PL_current_context; |
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150 | #define PERL_SET_CONTEXT(t) (PL_current_context = t) |
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151 | #define PERL_GET_CONTEXT PL_current_context |
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152 | #else |
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153 | #define PERL_GET_CONTEXT Perl_get_context() |
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154 | #define PERL_SET_CONTEXT(t) Perl_set_context(t) |
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155 | #endif |
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156 | |
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157 | #if defined(USE_THREADS) |
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158 | struct perl_thread; |
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159 | int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn); |
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160 | void Perl_set_thread_self (struct perl_thread *thr); |
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161 | void Perl_init_thread_intern (struct perl_thread *t); |
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162 | |
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163 | #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr) |
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164 | |
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165 | #endif /* USE_THREADS */ |
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166 | |
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167 | END_EXTERN_C |
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168 | |
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169 | #define INIT_THREADS NOOP |
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170 | #define ALLOC_THREAD_KEY \ |
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171 | STMT_START { \ |
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172 | if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) { \ |
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173 | fprintf(stderr,"panic: TlsAlloc"); \ |
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174 | exit(1); \ |
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175 | } \ |
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176 | } STMT_END |
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177 | |
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178 | #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER) |
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179 | #define JOIN(t, avp) \ |
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180 | STMT_START { \ |
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181 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ |
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182 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ |
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183 | || (CloseHandle((t)->self) == 0)) \ |
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184 | Perl_croak_nocontext("panic: JOIN"); \ |
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185 | *avp = (AV *)((t)->i.retv); \ |
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186 | } STMT_END |
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187 | #else /* !USE_RTL_THREAD_API || _MSC_VER */ |
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188 | #define JOIN(t, avp) \ |
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189 | STMT_START { \ |
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190 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ |
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191 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ |
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192 | || (CloseHandle((t)->self) == 0)) \ |
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193 | Perl_croak_nocontext("panic: JOIN"); \ |
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194 | } STMT_END |
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195 | #endif /* !USE_RTL_THREAD_API || _MSC_VER */ |
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196 | |
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197 | #define YIELD Sleep(0) |
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198 | |
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199 | #endif /* _WIN32THREAD_H */ |
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200 | |
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