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