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15794a95 | 1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
62dafdeb | 2 | /* Compile this one with gcc. */ |
fe9565ed KH |
3 | |
4 | /* Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005 | |
5 | Free Software Foundation, Inc. | |
62dafdeb MK |
6 | Contributed by Mumit Khan <khan@xraylith.wisc.edu>. |
7 | ||
1322177d | 8 | This file is part of GCC. |
62dafdeb | 9 | |
1322177d LB |
10 | GCC is free software; you can redistribute it and/or modify it under |
11 | the terms of the GNU General Public License as published by the Free | |
12 | Software Foundation; either version 2, or (at your option) any later | |
13 | version. | |
62dafdeb | 14 | |
1322177d LB |
15 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
16 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | for more details. | |
62dafdeb MK |
19 | |
20 | You should have received a copy of the GNU General Public License | |
1322177d | 21 | along with GCC; see the file COPYING. If not, write to the Free |
366ccddb KC |
22 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
23 | 02110-1301, USA. */ | |
62dafdeb MK |
24 | |
25 | /* As a special exception, if you link this library with other files, | |
26 | some of which are compiled with GCC, to produce an executable, | |
27 | this library does not by itself cause the resulting executable | |
28 | to be covered by the GNU General Public License. | |
29 | This exception does not however invalidate any other reasons why | |
30 | the executable file might be covered by the GNU General Public License. */ | |
31 | ||
88657302 RH |
32 | #ifndef GCC_GTHR_WIN32_H |
33 | #define GCC_GTHR_WIN32_H | |
62dafdeb | 34 | |
fea16f81 DS |
35 | /* Make sure CONST_CAST2 (origin in system.h) is declared. */ |
36 | #ifndef CONST_CAST2 | |
37 | #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq) | |
38 | #endif | |
39 | ||
62dafdeb | 40 | /* Windows32 threads specific definitions. The windows32 threading model |
589005ff | 41 | does not map well into pthread-inspired gcc's threading model, and so |
62dafdeb MK |
42 | there are caveats one needs to be aware of. |
43 | ||
f22a97d2 | 44 | 1. The destructor supplied to __gthread_key_create is ignored for |
589005ff KH |
45 | generic x86-win32 ports. This will certainly cause memory leaks |
46 | due to unreclaimed eh contexts (sizeof (eh_context) is at least | |
f22a97d2 | 47 | 24 bytes for x86 currently). |
62dafdeb MK |
48 | |
49 | This memory leak may be significant for long-running applications | |
50 | that make heavy use of C++ EH. | |
51 | ||
f22a97d2 MK |
52 | However, Mingw runtime (version 0.3 or newer) provides a mechanism |
53 | to emulate pthreads key dtors; the runtime provides a special DLL, | |
54 | linked in if -mthreads option is specified, that runs the dtors in | |
55 | the reverse order of registration when each thread exits. If | |
56 | -mthreads option is not given, a stub is linked in instead of the | |
589005ff | 57 | DLL, which results in memory leak. Other x86-win32 ports can use |
f22a97d2 MK |
58 | the same technique of course to avoid the leak. |
59 | ||
62dafdeb | 60 | 2. The error codes returned are non-POSIX like, and cast into ints. |
589005ff | 61 | This may cause incorrect error return due to truncation values on |
62dafdeb | 62 | hw where sizeof (DWORD) > sizeof (int). |
589005ff | 63 | |
80408cac WY |
64 | 3. We are currently using a special mutex instead of the Critical |
65 | Sections, since Win9x does not support TryEnterCriticalSection | |
66 | (while NT does). | |
589005ff | 67 | |
f22a97d2 MK |
68 | The basic framework should work well enough. In the long term, GCC |
69 | needs to use Structured Exception Handling on Windows32. */ | |
62dafdeb MK |
70 | |
71 | #define __GTHREADS 1 | |
72 | ||
5dab7f92 TP |
73 | #include <errno.h> |
74 | #ifdef __MINGW32__ | |
75 | #include <_mingw.h> | |
76 | #endif | |
15794a95 L |
77 | |
78 | #ifdef _LIBOBJC | |
79 | ||
3b56934f | 80 | /* This is necessary to prevent windef.h (included from windows.h) from |
f3b569ca | 81 | defining its own BOOL as a typedef. */ |
3b56934f CF |
82 | #ifndef __OBJC__ |
83 | #define __OBJC__ | |
84 | #endif | |
85 | #include <windows.h> | |
589005ff | 86 | /* Now undef the windows BOOL. */ |
3b56934f CF |
87 | #undef BOOL |
88 | ||
15794a95 | 89 | /* Key structure for maintaining thread specific storage */ |
fc98f5cb | 90 | static DWORD __gthread_objc_data_tls = (DWORD) -1; |
15794a95 L |
91 | |
92 | /* Backend initialization functions */ | |
93 | ||
71287280 | 94 | /* Initialize the threads subsystem. */ |
15794a95 | 95 | int |
fc98f5cb | 96 | __gthread_objc_init_thread_system (void) |
15794a95 | 97 | { |
ea4b7848 | 98 | /* Initialize the thread storage key. */ |
fc98f5cb | 99 | if ((__gthread_objc_data_tls = TlsAlloc ()) != (DWORD) -1) |
15794a95 L |
100 | return 0; |
101 | else | |
102 | return -1; | |
103 | } | |
104 | ||
71287280 | 105 | /* Close the threads subsystem. */ |
15794a95 | 106 | int |
fc98f5cb | 107 | __gthread_objc_close_thread_system (void) |
15794a95 | 108 | { |
fc98f5cb KH |
109 | if (__gthread_objc_data_tls != (DWORD) -1) |
110 | TlsFree (__gthread_objc_data_tls); | |
15794a95 L |
111 | return 0; |
112 | } | |
113 | ||
114 | /* Backend thread functions */ | |
115 | ||
71287280 | 116 | /* Create a new thread of execution. */ |
15794a95 | 117 | objc_thread_t |
fc98f5cb | 118 | __gthread_objc_thread_detach (void (*func)(void *arg), void *arg) |
15794a95 L |
119 | { |
120 | DWORD thread_id = 0; | |
121 | HANDLE win32_handle; | |
122 | ||
fc98f5cb KH |
123 | if (!(win32_handle = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) func, |
124 | arg, 0, &thread_id))) | |
15794a95 | 125 | thread_id = 0; |
589005ff | 126 | |
fc98f5cb | 127 | return (objc_thread_t) thread_id; |
15794a95 L |
128 | } |
129 | ||
71287280 | 130 | /* Set the current thread's priority. */ |
15794a95 | 131 | int |
fc98f5cb | 132 | __gthread_objc_thread_set_priority (int priority) |
15794a95 L |
133 | { |
134 | int sys_priority = 0; | |
135 | ||
136 | switch (priority) | |
137 | { | |
138 | case OBJC_THREAD_INTERACTIVE_PRIORITY: | |
139 | sys_priority = THREAD_PRIORITY_NORMAL; | |
140 | break; | |
141 | default: | |
142 | case OBJC_THREAD_BACKGROUND_PRIORITY: | |
143 | sys_priority = THREAD_PRIORITY_BELOW_NORMAL; | |
144 | break; | |
145 | case OBJC_THREAD_LOW_PRIORITY: | |
146 | sys_priority = THREAD_PRIORITY_LOWEST; | |
147 | break; | |
148 | } | |
149 | ||
150 | /* Change priority */ | |
fc98f5cb | 151 | if (SetThreadPriority (GetCurrentThread (), sys_priority)) |
15794a95 L |
152 | return 0; |
153 | else | |
154 | return -1; | |
155 | } | |
156 | ||
71287280 | 157 | /* Return the current thread's priority. */ |
15794a95 | 158 | int |
fc98f5cb | 159 | __gthread_objc_thread_get_priority (void) |
15794a95 L |
160 | { |
161 | int sys_priority; | |
162 | ||
fc98f5cb | 163 | sys_priority = GetThreadPriority (GetCurrentThread ()); |
589005ff | 164 | |
15794a95 L |
165 | switch (sys_priority) |
166 | { | |
167 | case THREAD_PRIORITY_HIGHEST: | |
168 | case THREAD_PRIORITY_TIME_CRITICAL: | |
169 | case THREAD_PRIORITY_ABOVE_NORMAL: | |
170 | case THREAD_PRIORITY_NORMAL: | |
171 | return OBJC_THREAD_INTERACTIVE_PRIORITY; | |
172 | ||
173 | default: | |
174 | case THREAD_PRIORITY_BELOW_NORMAL: | |
175 | return OBJC_THREAD_BACKGROUND_PRIORITY; | |
589005ff | 176 | |
15794a95 L |
177 | case THREAD_PRIORITY_IDLE: |
178 | case THREAD_PRIORITY_LOWEST: | |
179 | return OBJC_THREAD_LOW_PRIORITY; | |
180 | } | |
181 | ||
71287280 | 182 | /* Couldn't get priority. */ |
15794a95 L |
183 | return -1; |
184 | } | |
185 | ||
71287280 | 186 | /* Yield our process time to another thread. */ |
15794a95 | 187 | void |
fc98f5cb | 188 | __gthread_objc_thread_yield (void) |
15794a95 | 189 | { |
fc98f5cb | 190 | Sleep (0); |
15794a95 L |
191 | } |
192 | ||
71287280 | 193 | /* Terminate the current thread. */ |
15794a95 | 194 | int |
fc98f5cb | 195 | __gthread_objc_thread_exit (void) |
15794a95 L |
196 | { |
197 | /* exit the thread */ | |
fc98f5cb | 198 | ExitThread (__objc_thread_exit_status); |
15794a95 L |
199 | |
200 | /* Failed if we reached here */ | |
201 | return -1; | |
202 | } | |
203 | ||
71287280 | 204 | /* Returns an integer value which uniquely describes a thread. */ |
15794a95 | 205 | objc_thread_t |
fc98f5cb | 206 | __gthread_objc_thread_id (void) |
15794a95 | 207 | { |
fc98f5cb | 208 | return (objc_thread_t) GetCurrentThreadId (); |
15794a95 L |
209 | } |
210 | ||
71287280 | 211 | /* Sets the thread's local storage pointer. */ |
15794a95 | 212 | int |
fc98f5cb | 213 | __gthread_objc_thread_set_data (void *value) |
15794a95 | 214 | { |
fc98f5cb | 215 | if (TlsSetValue (__gthread_objc_data_tls, value)) |
15794a95 L |
216 | return 0; |
217 | else | |
218 | return -1; | |
219 | } | |
220 | ||
71287280 | 221 | /* Returns the thread's local storage pointer. */ |
15794a95 | 222 | void * |
fc98f5cb | 223 | __gthread_objc_thread_get_data (void) |
15794a95 | 224 | { |
69e905c8 TP |
225 | DWORD lasterror; |
226 | void *ptr; | |
227 | ||
fc98f5cb | 228 | lasterror = GetLastError (); |
69e905c8 | 229 | |
fc98f5cb | 230 | ptr = TlsGetValue (__gthread_objc_data_tls); /* Return thread data. */ |
69e905c8 | 231 | |
fc98f5cb | 232 | SetLastError (lasterror); |
69e905c8 TP |
233 | |
234 | return ptr; | |
15794a95 L |
235 | } |
236 | ||
237 | /* Backend mutex functions */ | |
238 | ||
71287280 | 239 | /* Allocate a mutex. */ |
15794a95 | 240 | int |
fc98f5cb | 241 | __gthread_objc_mutex_allocate (objc_mutex_t mutex) |
15794a95 | 242 | { |
fc98f5cb | 243 | if ((mutex->backend = (void *) CreateMutex (NULL, 0, NULL)) == NULL) |
15794a95 L |
244 | return -1; |
245 | else | |
246 | return 0; | |
247 | } | |
248 | ||
71287280 | 249 | /* Deallocate a mutex. */ |
15794a95 | 250 | int |
fc98f5cb | 251 | __gthread_objc_mutex_deallocate (objc_mutex_t mutex) |
15794a95 | 252 | { |
fc98f5cb | 253 | CloseHandle ((HANDLE) (mutex->backend)); |
15794a95 L |
254 | return 0; |
255 | } | |
256 | ||
71287280 | 257 | /* Grab a lock on a mutex. */ |
15794a95 | 258 | int |
fc98f5cb | 259 | __gthread_objc_mutex_lock (objc_mutex_t mutex) |
15794a95 L |
260 | { |
261 | int status; | |
262 | ||
fc98f5cb | 263 | status = WaitForSingleObject ((HANDLE) (mutex->backend), INFINITE); |
15794a95 L |
264 | if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) |
265 | return -1; | |
266 | else | |
267 | return 0; | |
268 | } | |
269 | ||
71287280 | 270 | /* Try to grab a lock on a mutex. */ |
15794a95 | 271 | int |
fc98f5cb | 272 | __gthread_objc_mutex_trylock (objc_mutex_t mutex) |
15794a95 L |
273 | { |
274 | int status; | |
275 | ||
fc98f5cb | 276 | status = WaitForSingleObject ((HANDLE) (mutex->backend), 0); |
15794a95 L |
277 | if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) |
278 | return -1; | |
279 | else | |
280 | return 0; | |
281 | } | |
282 | ||
283 | /* Unlock the mutex */ | |
284 | int | |
fc98f5cb | 285 | __gthread_objc_mutex_unlock (objc_mutex_t mutex) |
15794a95 | 286 | { |
fc98f5cb | 287 | if (ReleaseMutex ((HANDLE) (mutex->backend)) == 0) |
15794a95 L |
288 | return -1; |
289 | else | |
290 | return 0; | |
291 | } | |
292 | ||
293 | /* Backend condition mutex functions */ | |
294 | ||
71287280 | 295 | /* Allocate a condition. */ |
15794a95 | 296 | int |
fc98f5cb | 297 | __gthread_objc_condition_allocate (objc_condition_t condition) |
15794a95 | 298 | { |
71287280 | 299 | /* Unimplemented. */ |
15794a95 L |
300 | return -1; |
301 | } | |
302 | ||
71287280 | 303 | /* Deallocate a condition. */ |
15794a95 | 304 | int |
fc98f5cb | 305 | __gthread_objc_condition_deallocate (objc_condition_t condition) |
15794a95 | 306 | { |
71287280 | 307 | /* Unimplemented. */ |
15794a95 L |
308 | return -1; |
309 | } | |
310 | ||
311 | /* Wait on the condition */ | |
312 | int | |
fc98f5cb | 313 | __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) |
15794a95 | 314 | { |
71287280 | 315 | /* Unimplemented. */ |
15794a95 L |
316 | return -1; |
317 | } | |
318 | ||
71287280 | 319 | /* Wake up all threads waiting on this condition. */ |
15794a95 | 320 | int |
fc98f5cb | 321 | __gthread_objc_condition_broadcast (objc_condition_t condition) |
15794a95 | 322 | { |
71287280 | 323 | /* Unimplemented. */ |
15794a95 L |
324 | return -1; |
325 | } | |
326 | ||
71287280 | 327 | /* Wake up one thread waiting on this condition. */ |
15794a95 | 328 | int |
fc98f5cb | 329 | __gthread_objc_condition_signal (objc_condition_t condition) |
15794a95 | 330 | { |
71287280 | 331 | /* Unimplemented. */ |
15794a95 L |
332 | return -1; |
333 | } | |
334 | ||
335 | #else /* _LIBOBJC */ | |
336 | ||
b25bb36a DS |
337 | #ifdef __cplusplus |
338 | extern "C" { | |
339 | #endif | |
62dafdeb | 340 | |
b25bb36a | 341 | typedef unsigned long __gthread_key_t; |
62dafdeb MK |
342 | |
343 | typedef struct { | |
344 | int done; | |
345 | long started; | |
346 | } __gthread_once_t; | |
347 | ||
80408cac WY |
348 | typedef struct { |
349 | long counter; | |
350 | void *sema; | |
351 | } __gthread_mutex_t; | |
62dafdeb | 352 | |
40aac948 JM |
353 | typedef struct { |
354 | long counter; | |
355 | long depth; | |
40219f96 | 356 | unsigned long owner; |
40aac948 JM |
357 | void *sema; |
358 | } __gthread_recursive_mutex_t; | |
359 | ||
b25bb36a | 360 | #define __GTHREAD_ONCE_INIT {0, -1} |
62dafdeb | 361 | #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function |
42dfcf84 | 362 | #define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0} |
40219f96 WY |
363 | #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION \ |
364 | __gthread_recursive_mutex_init_function | |
365 | #define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0, 0, 0} | |
62dafdeb | 366 | |
f22a97d2 MK |
367 | #if __MINGW32_MAJOR_VERSION >= 1 || \ |
368 | (__MINGW32_MAJOR_VERSION == 0 && __MINGW32_MINOR_VERSION > 2) | |
369 | #define MINGW32_SUPPORTS_MT_EH 1 | |
cc2902df | 370 | /* Mingw runtime >= v0.3 provides a magic variable that is set to nonzero |
589005ff | 371 | if -mthreads option was specified, or 0 otherwise. This is to get around |
f22a97d2 MK |
372 | the lack of weak symbols in PE-COFF. */ |
373 | extern int _CRT_MT; | |
b25bb36a DS |
374 | extern int __mingwthr_key_dtor (unsigned long, void (*) (void *)); |
375 | #endif /* __MINGW32__ version */ | |
f22a97d2 | 376 | |
42dfcf84 WY |
377 | /* The Windows95 kernel does not export InterlockedCompareExchange. |
378 | This provides a substitute. When building apps that reference | |
379 | gthread_mutex_try_lock, the __GTHREAD_I486_INLINE_LOCK_PRIMITIVES | |
380 | macro must be defined if Windows95 is a target. Currently | |
381 | gthread_mutex_try_lock is not referenced by libgcc or libstdc++. */ | |
382 | #ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES | |
383 | static inline long | |
384 | __gthr_i486_lock_cmp_xchg(long *dest, long xchg, long comperand) | |
385 | { | |
386 | long result; | |
387 | __asm__ __volatile__ ("\n\ | |
388 | lock\n\ | |
389 | cmpxchg{l} {%4, %1|%1, %4}\n" | |
390 | : "=a" (result), "=m" (*dest) | |
391 | : "0" (comperand), "m" (*dest), "r" (xchg) | |
392 | : "cc"); | |
393 | return result; | |
394 | } | |
395 | #define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg | |
396 | #else /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */ | |
397 | #define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange | |
398 | #endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */ | |
399 | ||
62dafdeb | 400 | static inline int |
d1e51320 | 401 | __gthread_active_p (void) |
62dafdeb | 402 | { |
f22a97d2 MK |
403 | #ifdef MINGW32_SUPPORTS_MT_EH |
404 | return _CRT_MT; | |
405 | #else | |
62dafdeb | 406 | return 1; |
f22a97d2 | 407 | #endif |
62dafdeb MK |
408 | } |
409 | ||
81888fcd | 410 | #if __GTHREAD_HIDE_WIN32API |
b25bb36a DS |
411 | |
412 | /* The implementations are in config/i386/gthr-win32.c in libgcc.a. | |
413 | Only stubs are exposed to avoid polluting the C++ namespace with | |
414 | windows api definitions. */ | |
415 | ||
416 | extern int __gthr_win32_once (__gthread_once_t *, void (*) (void)); | |
417 | extern int __gthr_win32_key_create (__gthread_key_t *, void (*) (void*)); | |
418 | extern int __gthr_win32_key_delete (__gthread_key_t); | |
419 | extern void * __gthr_win32_getspecific (__gthread_key_t); | |
420 | extern int __gthr_win32_setspecific (__gthread_key_t, const void *); | |
421 | extern void __gthr_win32_mutex_init_function (__gthread_mutex_t *); | |
422 | extern int __gthr_win32_mutex_lock (__gthread_mutex_t *); | |
423 | extern int __gthr_win32_mutex_trylock (__gthread_mutex_t *); | |
424 | extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *); | |
40219f96 WY |
425 | extern void |
426 | __gthr_win32_recursive_mutex_init_function (__gthread_recursive_mutex_t *); | |
427 | extern int __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *); | |
428 | extern int | |
429 | __gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *); | |
430 | extern int __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *); | |
c262f705 | 431 | extern void __gthr_win32_mutex_destroy (__gthread_mutex_t *); |
b25bb36a DS |
432 | |
433 | static inline int | |
434 | __gthread_once (__gthread_once_t *once, void (*func) (void)) | |
435 | { | |
fc98f5cb | 436 | if (__gthread_active_p ()) |
b25bb36a DS |
437 | return __gthr_win32_once (once, func); |
438 | else | |
fc98f5cb | 439 | return -1; |
b25bb36a DS |
440 | } |
441 | ||
442 | static inline int | |
443 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) | |
444 | { | |
445 | return __gthr_win32_key_create (key, dtor); | |
446 | } | |
447 | ||
fc98f5cb | 448 | static inline int |
b25bb36a DS |
449 | __gthread_key_delete (__gthread_key_t key) |
450 | { | |
fc98f5cb | 451 | return __gthr_win32_key_delete (key); |
b25bb36a DS |
452 | } |
453 | ||
454 | static inline void * | |
455 | __gthread_getspecific (__gthread_key_t key) | |
456 | { | |
457 | return __gthr_win32_getspecific (key); | |
458 | } | |
459 | ||
460 | static inline int | |
461 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
462 | { | |
fea16f81 | 463 | return __gthr_win32_setspecific (key, ptr); |
b25bb36a DS |
464 | } |
465 | ||
466 | static inline void | |
467 | __gthread_mutex_init_function (__gthread_mutex_t *mutex) | |
468 | { | |
469 | __gthr_win32_mutex_init_function (mutex); | |
470 | } | |
471 | ||
c262f705 DS |
472 | static inline void |
473 | __gthread_mutex_destroy (__gthread_mutex_t *mutex) | |
474 | { | |
475 | __gthr_win32_mutex_destroy (mutex); | |
476 | } | |
477 | ||
b25bb36a DS |
478 | static inline int |
479 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
480 | { | |
481 | if (__gthread_active_p ()) | |
482 | return __gthr_win32_mutex_lock (mutex); | |
483 | else | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static inline int | |
488 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
489 | { | |
490 | if (__gthread_active_p ()) | |
491 | return __gthr_win32_mutex_trylock (mutex); | |
492 | else | |
fc98f5cb | 493 | return 0; |
b25bb36a DS |
494 | } |
495 | ||
496 | static inline int | |
497 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
498 | { | |
499 | if (__gthread_active_p ()) | |
500 | return __gthr_win32_mutex_unlock (mutex); | |
501 | else | |
fc98f5cb | 502 | return 0; |
b25bb36a DS |
503 | } |
504 | ||
40219f96 WY |
505 | static inline void |
506 | __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) | |
507 | { | |
508 | __gthr_win32_recursive_mutex_init_function (mutex); | |
509 | } | |
510 | ||
40aac948 JM |
511 | static inline int |
512 | __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) | |
513 | { | |
514 | if (__gthread_active_p ()) | |
515 | return __gthr_win32_recursive_mutex_lock (mutex); | |
516 | else | |
517 | return 0; | |
518 | } | |
519 | ||
520 | static inline int | |
521 | __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) | |
522 | { | |
523 | if (__gthread_active_p ()) | |
524 | return __gthr_win32_recursive_mutex_trylock (mutex); | |
525 | else | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static inline int | |
530 | __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) | |
531 | { | |
532 | if (__gthread_active_p ()) | |
533 | return __gthr_win32_recursive_mutex_unlock (mutex); | |
534 | else | |
535 | return 0; | |
536 | } | |
537 | ||
b25bb36a DS |
538 | #else /* ! __GTHREAD_HIDE_WIN32API */ |
539 | ||
540 | #include <windows.h> | |
541 | #include <errno.h> | |
542 | ||
62dafdeb | 543 | static inline int |
d1e51320 | 544 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
62dafdeb MK |
545 | { |
546 | if (! __gthread_active_p ()) | |
547 | return -1; | |
548 | else if (once == NULL || func == NULL) | |
549 | return EINVAL; | |
550 | ||
551 | if (! once->done) | |
552 | { | |
553 | if (InterlockedIncrement (&(once->started)) == 0) | |
589005ff | 554 | { |
62dafdeb MK |
555 | (*func) (); |
556 | once->done = TRUE; | |
557 | } | |
f22a97d2 MK |
558 | else |
559 | { | |
589005ff KH |
560 | /* Another thread is currently executing the code, so wait for it |
561 | to finish; yield the CPU in the meantime. If performance | |
562 | does become an issue, the solution is to use an Event that | |
563 | we wait on here (and set above), but that implies a place to | |
564 | create the event before this routine is called. */ | |
f22a97d2 MK |
565 | while (! once->done) |
566 | Sleep (0); | |
567 | } | |
62dafdeb | 568 | } |
589005ff | 569 | |
62dafdeb MK |
570 | return 0; |
571 | } | |
572 | ||
f22a97d2 | 573 | /* Windows32 thread local keys don't support destructors; this leads to |
589005ff | 574 | leaks, especially in threaded applications making extensive use of |
f22a97d2 | 575 | C++ EH. Mingw uses a thread-support DLL to work-around this problem. */ |
62dafdeb | 576 | static inline int |
ccf8e764 RH |
577 | __gthread_key_create (__gthread_key_t *key, |
578 | void (*dtor) (void *) __attribute__((unused))) | |
62dafdeb MK |
579 | { |
580 | int status = 0; | |
581 | DWORD tls_index = TlsAlloc (); | |
582 | if (tls_index != 0xFFFFFFFF) | |
f22a97d2 MK |
583 | { |
584 | *key = tls_index; | |
585 | #ifdef MINGW32_SUPPORTS_MT_EH | |
586 | /* Mingw runtime will run the dtors in reverse order for each thread | |
587 | when the thread exits. */ | |
588 | status = __mingwthr_key_dtor (*key, dtor); | |
589 | #endif | |
590 | } | |
62dafdeb MK |
591 | else |
592 | status = (int) GetLastError (); | |
593 | return status; | |
594 | } | |
595 | ||
62dafdeb MK |
596 | static inline int |
597 | __gthread_key_delete (__gthread_key_t key) | |
598 | { | |
599 | return (TlsFree (key) != 0) ? 0 : (int) GetLastError (); | |
600 | } | |
601 | ||
602 | static inline void * | |
603 | __gthread_getspecific (__gthread_key_t key) | |
604 | { | |
69e905c8 TP |
605 | DWORD lasterror; |
606 | void *ptr; | |
607 | ||
fc98f5cb | 608 | lasterror = GetLastError (); |
69e905c8 | 609 | |
fc98f5cb | 610 | ptr = TlsGetValue (key); |
69e905c8 | 611 | |
fc98f5cb | 612 | SetLastError (lasterror); |
69e905c8 TP |
613 | |
614 | return ptr; | |
62dafdeb MK |
615 | } |
616 | ||
617 | static inline int | |
618 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
619 | { | |
fea16f81 DS |
620 | if (TlsSetValue (key, CONST_CAST2(void *, const void *, ptr)) != 0) |
621 | return 0; | |
622 | else | |
623 | return GetLastError (); | |
62dafdeb MK |
624 | } |
625 | ||
626 | static inline void | |
627 | __gthread_mutex_init_function (__gthread_mutex_t *mutex) | |
628 | { | |
42dfcf84 | 629 | mutex->counter = -1; |
80408cac | 630 | mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL); |
62dafdeb MK |
631 | } |
632 | ||
ef4195d6 | 633 | static inline void |
4dabf736 | 634 | __gthread_mutex_destroy (__gthread_mutex_t *mutex) |
ef4195d6 JD |
635 | { |
636 | CloseHandle ((HANDLE) mutex->sema); | |
637 | } | |
638 | ||
62dafdeb MK |
639 | static inline int |
640 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
641 | { | |
642 | int status = 0; | |
643 | ||
644 | if (__gthread_active_p ()) | |
645 | { | |
42dfcf84 | 646 | if (InterlockedIncrement (&mutex->counter) == 0 || |
80408cac | 647 | WaitForSingleObject (mutex->sema, INFINITE) == WAIT_OBJECT_0) |
62dafdeb MK |
648 | status = 0; |
649 | else | |
80408cac | 650 | { |
42dfcf84 WY |
651 | /* WaitForSingleObject returns WAIT_FAILED, and we can only do |
652 | some best-effort cleanup here. */ | |
80408cac WY |
653 | InterlockedDecrement (&mutex->counter); |
654 | status = 1; | |
655 | } | |
62dafdeb MK |
656 | } |
657 | return status; | |
658 | } | |
659 | ||
660 | static inline int | |
661 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
662 | { | |
663 | int status = 0; | |
664 | ||
665 | if (__gthread_active_p ()) | |
666 | { | |
42dfcf84 | 667 | if (__GTHR_W32_InterlockedCompareExchange (&mutex->counter, 0, -1) < 0) |
62dafdeb MK |
668 | status = 0; |
669 | else | |
670 | status = 1; | |
671 | } | |
672 | return status; | |
673 | } | |
674 | ||
675 | static inline int | |
676 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
677 | { | |
678 | if (__gthread_active_p ()) | |
80408cac | 679 | { |
42dfcf84 | 680 | if (InterlockedDecrement (&mutex->counter) >= 0) |
80408cac WY |
681 | return ReleaseSemaphore (mutex->sema, 1, NULL) ? 0 : 1; |
682 | } | |
683 | return 0; | |
62dafdeb MK |
684 | } |
685 | ||
40aac948 JM |
686 | static inline void |
687 | __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) | |
688 | { | |
689 | mutex->counter = -1; | |
690 | mutex->depth = 0; | |
691 | mutex->owner = 0; | |
692 | mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL); | |
693 | } | |
694 | ||
695 | static inline int | |
696 | __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) | |
697 | { | |
698 | if (__gthread_active_p ()) | |
699 | { | |
700 | DWORD me = GetCurrentThreadId(); | |
701 | if (InterlockedIncrement (&mutex->counter) == 0) | |
702 | { | |
703 | mutex->depth = 1; | |
704 | mutex->owner = me; | |
705 | } | |
706 | else if (mutex->owner == me) | |
707 | { | |
40219f96 | 708 | InterlockedDecrement (&mutex->counter); |
40aac948 JM |
709 | ++(mutex->depth); |
710 | } | |
711 | else if (WaitForSingleObject (mutex->sema, INFINITE) == WAIT_OBJECT_0) | |
712 | { | |
713 | mutex->depth = 1; | |
714 | mutex->owner = me; | |
715 | } | |
716 | else | |
717 | { | |
718 | /* WaitForSingleObject returns WAIT_FAILED, and we can only do | |
719 | some best-effort cleanup here. */ | |
720 | InterlockedDecrement (&mutex->counter); | |
721 | return 1; | |
722 | } | |
723 | } | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static inline int | |
728 | __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) | |
729 | { | |
730 | if (__gthread_active_p ()) | |
731 | { | |
732 | DWORD me = GetCurrentThreadId(); | |
733 | if (__GTHR_W32_InterlockedCompareExchange (&mutex->counter, 0, -1) < 0) | |
734 | { | |
735 | mutex->depth = 1; | |
736 | mutex->owner = me; | |
737 | } | |
738 | else if (mutex->owner == me) | |
739 | ++(mutex->depth); | |
740 | else | |
741 | return 1; | |
742 | } | |
743 | return 0; | |
744 | } | |
745 | ||
746 | static inline int | |
747 | __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) | |
748 | { | |
749 | if (__gthread_active_p ()) | |
750 | { | |
751 | --(mutex->depth); | |
752 | if (mutex->depth == 0) | |
753 | { | |
754 | mutex->owner = 0; | |
755 | ||
756 | if (InterlockedDecrement (&mutex->counter) >= 0) | |
757 | return ReleaseSemaphore (mutex->sema, 1, NULL) ? 0 : 1; | |
758 | } | |
759 | } | |
760 | return 0; | |
761 | } | |
762 | ||
b25bb36a DS |
763 | #endif /* __GTHREAD_HIDE_WIN32API */ |
764 | ||
765 | #ifdef __cplusplus | |
766 | } | |
767 | #endif | |
768 | ||
15794a95 L |
769 | #endif /* _LIBOBJC */ |
770 | ||
88657302 | 771 | #endif /* ! GCC_GTHR_WIN32_H */ |