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1 | #ifndef _WIN32THREAD_H |
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 |
11 | |
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) |
18 | #define MUTEX_LOCK(m) EnterCriticalSection(m) |
19 | #define MUTEX_UNLOCK(m) LeaveCriticalSection(m) |
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20 | #define MUTEX_LOCK_NOCONTEXT(m) EnterCriticalSection(m) |
21 | #define MUTEX_UNLOCK_NOCONTEXT(m) LeaveCriticalSection(m) |
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22 | #define MUTEX_DESTROY(m) DeleteCriticalSection(m) |
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23 | |
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24 | #else |
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25 | |
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26 | typedef HANDLE perl_mutex; |
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27 | #define MUTEX_INIT(m) \ |
28 | STMT_START { \ |
29 | if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL) \ |
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30 | Perl_croak(aTHX_ "panic: MUTEX_INIT"); \ |
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31 | } STMT_END |
32 | #define MUTEX_LOCK(m) \ |
33 | STMT_START { \ |
34 | if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED) \ |
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35 | Perl_croak(aTHX_ "panic: MUTEX_LOCK"); \ |
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36 | } STMT_END |
37 | #define MUTEX_UNLOCK(m) \ |
38 | STMT_START { \ |
39 | if (ReleaseMutex(*(m)) == 0) \ |
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40 | Perl_croak(aTHX_ "panic: MUTEX_UNLOCK"); \ |
41 | } STMT_END |
42 | #define MUTEX_LOCK_NOCONTEXT(m) \ |
43 | STMT_START { \ |
44 | if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED) \ |
45 | Perl_croak_nocontext("panic: MUTEX_LOCK"); \ |
46 | } STMT_END |
47 | #define MUTEX_UNLOCK_NOCONTEXT(m) \ |
48 | STMT_START { \ |
49 | if (ReleaseMutex(*(m)) == 0) \ |
50 | Perl_croak_nocontext("panic: MUTEX_UNLOCK"); \ |
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51 | } STMT_END |
52 | #define MUTEX_DESTROY(m) \ |
53 | STMT_START { \ |
54 | if (CloseHandle(*(m)) == 0) \ |
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55 | Perl_croak(aTHX_ "panic: MUTEX_DESTROY"); \ |
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56 | } STMT_END |
57 | |
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58 | #endif |
59 | |
60 | /* These macros assume that the mutex associated with the condition |
61 | * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY}, |
62 | * so there's no separate mutex protecting access to (c)->waiters |
63 | */ |
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64 | #define COND_INIT(c) \ |
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65 | STMT_START { \ |
66 | (c)->waiters = 0; \ |
67 | (c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL); \ |
68 | if ((c)->sem == NULL) \ |
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69 | Perl_croak(aTHX_ "panic: COND_INIT (%ld)",GetLastError()); \ |
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70 | } STMT_END |
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71 | |
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72 | #define COND_SIGNAL(c) \ |
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73 | STMT_START { \ |
74 | if ((c)->waiters > 0 && \ |
75 | ReleaseSemaphore((c)->sem,1,NULL) == 0) \ |
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76 | Perl_croak(aTHX_ "panic: COND_SIGNAL (%ld)",GetLastError()); \ |
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77 | } STMT_END |
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78 | |
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79 | #define COND_BROADCAST(c) \ |
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80 | STMT_START { \ |
81 | if ((c)->waiters > 0 && \ |
82 | ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0) \ |
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83 | Perl_croak(aTHX_ "panic: COND_BROADCAST (%ld)",GetLastError());\ |
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84 | } STMT_END |
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85 | |
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86 | #define COND_WAIT(c, m) \ |
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87 | STMT_START { \ |
88 | (c)->waiters++; \ |
89 | MUTEX_UNLOCK(m); \ |
90 | /* Note that there's no race here, since a \ |
91 | * COND_BROADCAST() on another thread will have seen the\ |
92 | * right number of waiters (i.e. including this one) */ \ |
93 | if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\ |
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94 | Perl_croak(aTHX_ "panic: COND_WAIT (%ld)",GetLastError()); \ |
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95 | /* XXX there may be an inconsequential race here */ \ |
96 | MUTEX_LOCK(m); \ |
97 | (c)->waiters--; \ |
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98 | } STMT_END |
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99 | |
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100 | #define COND_DESTROY(c) \ |
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101 | STMT_START { \ |
102 | (c)->waiters = 0; \ |
103 | if (CloseHandle((c)->sem) == 0) \ |
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104 | Perl_croak(aTHX_ "panic: COND_DESTROY (%ld)",GetLastError()); \ |
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105 | } STMT_END |
106 | |
107 | #define DETACH(t) \ |
108 | STMT_START { \ |
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109 | if (CloseHandle((t)->self) == 0) { \ |
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110 | MUTEX_UNLOCK(&(t)->mutex); \ |
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111 | Perl_croak(aTHX_ "panic: DETACH"); \ |
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112 | } \ |
113 | } STMT_END |
114 | |
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115 | |
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116 | #define THREAD_CREATE(t, f) Perl_thread_create(t, f) |
117 | #define THREAD_POST_CREATE(t) NOOP |
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118 | |
119 | /* XXX Docs mention that the RTL versions of thread creation routines |
120 | * should be used, but that advice only seems applicable when the RTL |
121 | * is not in a DLL. RTL DLLs in both Borland and VC seem to do all of |
122 | * the init/deinit required upon DLL_THREAD_ATTACH/DETACH. So we seem |
123 | * to be completely safe using straight Win32 API calls, rather than |
124 | * the much braindamaged RTL calls. |
125 | * |
126 | * _beginthread() in the RTLs call CloseHandle() just after the thread |
127 | * function returns, which means: 1) we have a race on our hands |
128 | * 2) it is impossible to implement join() semantics. |
129 | * |
130 | * IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here |
131 | * for experimental purposes only. GSAR 98-01-02 |
132 | */ |
133 | #ifdef USE_RTL_THREAD_API |
134 | # include <process.h> |
135 | # if defined(__BORLANDC__) |
136 | /* Borland RTL doesn't allow a return value from thread function! */ |
137 | # define THREAD_RET_TYPE void _USERENTRY |
138 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
139 | # elif defined (_MSC_VER) |
140 | # define THREAD_RET_TYPE unsigned __stdcall |
141 | # define THREAD_RET_CAST(p) ((unsigned)(p)) |
142 | # else |
143 | /* CRTDLL.DLL doesn't allow a return value from thread function! */ |
144 | # define THREAD_RET_TYPE void __cdecl |
145 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
146 | # endif |
147 | #else /* !USE_RTL_THREAD_API */ |
148 | # define THREAD_RET_TYPE DWORD WINAPI |
149 | # define THREAD_RET_CAST(p) ((DWORD)(p)) |
150 | #endif /* !USE_RTL_THREAD_API */ |
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151 | |
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152 | typedef THREAD_RET_TYPE thread_func_t(void *); |
153 | |
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154 | |
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155 | START_EXTERN_C |
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156 | |
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157 | #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL)) |
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158 | extern __declspec(thread) struct perl_thread *Perl_current_thread; |
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159 | #define SET_THR(t) (Perl_current_thread = t) |
160 | #define THR Perl_current_thread |
161 | #else |
162 | #define THR Perl_getTHR() |
163 | #define SET_THR(t) Perl_setTHR(t) |
164 | #endif |
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165 | struct perl_thread; |
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166 | |
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167 | void Perl_alloc_thread_key (void); |
168 | int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn); |
169 | void Perl_set_thread_self (struct perl_thread *thr); |
170 | struct perl_thread *Perl_getTHR (void); |
171 | void Perl_setTHR (struct perl_thread *t); |
172 | void Perl_init_thread_intern (struct perl_thread *t); |
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173 | |
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174 | END_EXTERN_C |
175 | |
176 | #define INIT_THREADS NOOP |
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177 | #define ALLOC_THREAD_KEY Perl_alloc_thread_key() |
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178 | #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr) |
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179 | |
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180 | #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER) |
181 | #define JOIN(t, avp) \ |
182 | STMT_START { \ |
183 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ |
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184 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ |
185 | || (CloseHandle((t)->self) == 0)) \ |
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186 | Perl_croak(aTHX_ "panic: JOIN"); \ |
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187 | *avp = (AV *)((t)->i.retv); \ |
188 | } STMT_END |
189 | #else /* !USE_RTL_THREAD_API || _MSC_VER */ |
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190 | #define JOIN(t, avp) \ |
191 | STMT_START { \ |
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192 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ |
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193 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ |
194 | || (CloseHandle((t)->self) == 0)) \ |
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195 | Perl_croak(aTHX_ "panic: JOIN"); \ |
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196 | } STMT_END |
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197 | #endif /* !USE_RTL_THREAD_API || _MSC_VER */ |
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198 | |
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199 | #define YIELD Sleep(0) |
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200 | |
201 | #endif /* _WIN32THREAD_H */ |
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202 | |