Mercurial > sdl-ios-xcode
annotate src/thread/bsdi/SDL_syssem.c @ 1338:604d73db6802
Removed uses of stdlib.h and string.h
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 09:29:18 +0000 |
| parents | 3692456e7b0f |
| children | c71e05b4dc2e |
| rev | line source |
|---|---|
| 256 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 256 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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|
6 modify it under the terms of the GNU Lesser General Public |
| 256 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 256 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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Sam Lantinga <slouken@libsdl.org>
parents:
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diff
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|
13 Lesser General Public License for more details. |
| 256 | 14 |
|
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 256 | 18 |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 256 | 21 */ |
| 22 | |
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23 #include "SDL_stdlib.h" |
| 256 | 24 #include "SDL_error.h" |
| 25 #include "SDL_thread.h" | |
| 26 #include "SDL_timer.h" | |
| 27 | |
| 28 #ifdef SDL_USE_PTHREADS | |
| 29 | |
| 30 #include <unistd.h> /* For getpid() */ | |
| 31 #include <pthread.h> | |
| 32 | |
| 33 | |
| 34 /* | |
| 35 * This is semaphore.h inlined here so that BSD/OS POSIX semaphore are | |
| 36 * completely selfcontained without requiring any additional include files | |
| 37 * or libraries not present in the stock system | |
| 38 */ | |
| 39 | |
| 40 /* semaphore.h: POSIX 1003.1b semaphores */ | |
| 41 | |
| 42 /*- | |
| 43 * Copyright (c) 1996, 1997 | |
| 44 * HD Associates, Inc. All rights reserved. | |
| 45 * | |
| 46 * Redistribution and use in source and binary forms, with or without | |
| 47 * modification, are permitted provided that the following conditions | |
| 48 * are met: | |
| 49 * 1. Redistributions of source code must retain the above copyright | |
| 50 * notice, this list of conditions and the following disclaimer. | |
| 51 * 2. Redistributions in binary form must reproduce the above copyright | |
| 52 * notice, this list of conditions and the following disclaimer in the | |
| 53 * documentation and/or other materials provided with the distribution. | |
| 54 * 3. All advertising materials mentioning features or use of this software | |
| 55 * must display the following acknowledgement: | |
| 56 * This product includes software developed by HD Associates, Inc | |
| 57 * 4. Neither the name of the author nor the names of any co-contributors | |
| 58 * may be used to endorse or promote products derived from this software | |
| 59 * without specific prior written permission. | |
| 60 * | |
| 61 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND | |
| 62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 64 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE | |
| 65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 71 * SUCH DAMAGE. | |
| 72 * | |
| 73 * $FreeBSD: src/sys/posix4/semaphore.h,v 1.6 2000/01/20 07:55:42 jasone Exp $ | |
| 74 */ | |
| 75 | |
| 76 #include <machine/limits.h> | |
| 77 | |
| 78 #include <sys/types.h> | |
| 79 #include <fcntl.h> | |
| 80 | |
| 81 /* Opaque type definition. */ | |
| 82 struct sem; | |
| 83 typedef struct sem *sem_t; | |
| 84 | |
| 85 #define SEM_FAILED ((sem_t *)0) | |
| 86 #define SEM_VALUE_MAX UINT_MAX | |
| 87 | |
| 88 #include <sys/cdefs.h> | |
| 89 | |
| 90 __BEGIN_DECLS | |
| 91 int sem_init __P((sem_t *, int, unsigned int)); | |
| 92 int sem_destroy __P((sem_t *)); | |
| 93 sem_t *sem_open __P((const char *, int, ...)); | |
| 94 int sem_close __P((sem_t *)); | |
| 95 int sem_unlink __P((const char *)); | |
| 96 int sem_wait __P((sem_t *)); | |
| 97 int sem_trywait __P((sem_t *)); | |
| 98 int sem_post __P((sem_t *)); | |
| 99 int sem_getvalue __P((sem_t *, int *)); | |
| 100 __END_DECLS | |
| 101 | |
| 102 /* END of inlined semaphore.h */ | |
| 103 | |
| 104 /* Wrapper around POSIX 1003.1b semaphores */ | |
| 105 | |
| 106 struct SDL_semaphore { | |
| 107 sem_t *sem; | |
| 108 sem_t sem_data; | |
| 109 }; | |
| 110 | |
| 111 /* Create a semaphore, initialized with value */ | |
| 112 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 113 { | |
|
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114 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); |
| 256 | 115 if ( sem ) { |
| 116 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) { | |
| 117 SDL_SetError("sem_init() failed"); | |
|
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parents:
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diff
changeset
|
118 SDL_free(sem); |
| 256 | 119 sem = NULL; |
| 120 } else { | |
| 121 sem->sem = &sem->sem_data; | |
| 122 } | |
| 123 } else { | |
| 124 SDL_OutOfMemory(); | |
| 125 } | |
| 126 return sem; | |
| 127 } | |
| 128 | |
| 129 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 130 { | |
| 131 if ( sem ) { | |
| 132 sem_destroy(sem->sem); | |
|
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3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
133 SDL_free(sem); |
| 256 | 134 } |
| 135 } | |
| 136 | |
| 137 int SDL_SemTryWait(SDL_sem *sem) | |
| 138 { | |
| 139 int retval; | |
| 140 | |
| 141 if ( ! sem ) { | |
| 142 SDL_SetError("Passed a NULL semaphore"); | |
| 143 return -1; | |
| 144 } | |
| 145 retval = SDL_MUTEX_TIMEDOUT; | |
| 146 if ( sem_trywait(sem->sem) == 0 ) | |
| 147 retval = 0; | |
| 148 return retval; | |
| 149 } | |
| 150 | |
| 151 int SDL_SemWait(SDL_sem *sem) | |
| 152 { | |
| 153 int retval; | |
| 154 | |
| 155 if ( ! sem ) { | |
| 156 SDL_SetError("Passed a NULL semaphore"); | |
| 157 return -1; | |
| 158 } | |
| 159 | |
| 160 retval = sem_wait(sem->sem); | |
| 161 if ( retval < 0 ) { | |
| 162 SDL_SetError("sem_wait() failed"); | |
| 163 } | |
| 164 return retval; | |
| 165 } | |
| 166 | |
| 167 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 168 { | |
| 169 int retval; | |
| 170 | |
| 171 if ( ! sem ) { | |
| 172 SDL_SetError("Passed a NULL semaphore"); | |
| 173 return -1; | |
| 174 } | |
| 175 | |
| 176 /* Try the easy cases first */ | |
| 177 if ( timeout == 0 ) { | |
| 178 return SDL_SemTryWait(sem); | |
| 179 } | |
| 180 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 181 return SDL_SemWait(sem); | |
| 182 } | |
| 183 | |
| 184 /* Ack! We have to busy wait... */ | |
| 185 timeout += SDL_GetTicks(); | |
| 186 do { | |
| 187 retval = SDL_SemTryWait(sem); | |
| 188 if ( retval == 0 ) { | |
| 189 break; | |
| 190 } | |
| 191 SDL_Delay(1); | |
| 192 } while ( SDL_GetTicks() < timeout ); | |
| 193 | |
| 194 return retval; | |
| 195 } | |
| 196 | |
| 197 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 198 { | |
| 199 int ret = 0; | |
| 200 if ( sem ) { | |
| 201 sem_getvalue(sem->sem, &ret); | |
| 202 if ( ret < 0 ) { | |
| 203 ret = 0; | |
| 204 } | |
| 205 } | |
| 206 return (Uint32)ret; | |
| 207 } | |
| 208 | |
| 209 int SDL_SemPost(SDL_sem *sem) | |
| 210 { | |
| 211 int retval; | |
| 212 | |
| 213 if ( ! sem ) { | |
| 214 SDL_SetError("Passed a NULL semaphore"); | |
| 215 return -1; | |
| 216 } | |
| 217 | |
| 218 retval = sem_post(sem->sem); | |
| 219 if ( retval < 0 ) { | |
| 220 SDL_SetError("sem_post() failed"); | |
| 221 } | |
| 222 return retval; | |
| 223 } | |
| 224 | |
| 225 /* | |
| 226 * BEGIN inlined uthread_sem.c. This is done here so that no extra libraries | |
| 227 * or include files not present in BSD/OS are required | |
| 228 */ | |
| 229 | |
| 230 /* | |
| 231 * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>. | |
| 232 * All rights reserved. | |
| 233 * | |
| 234 * Redistribution and use in source and binary forms, with or without | |
| 235 * modification, are permitted provided that the following conditions | |
| 236 * are met: | |
| 237 * 1. Redistributions of source code must retain the above copyright | |
| 238 * notice(s), this list of conditions and the following disclaimer as | |
| 239 * the first lines of this file unmodified other than the possible | |
| 240 * addition of one or more copyright notices. | |
| 241 * 2. Redistributions in binary form must reproduce the above copyright | |
| 242 * notice(s), this list of conditions and the following disclaimer in | |
| 243 * the documentation and/or other materials provided with the | |
| 244 * distribution. | |
| 245 * | |
| 246 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY | |
| 247 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 248 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 249 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE | |
| 250 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 251 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 252 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
| 253 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 254 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE | |
| 255 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
| 256 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 257 * | |
| 258 * $FreeBSD: src/lib/libc_r/uthread/uthread_sem.c,v 1.3.2.1 2000/07/18 02:05:57 jasone Exp $ | |
| 259 */ | |
| 260 | |
| 261 #include <errno.h> | |
| 262 #include <pthread.h> | |
| 263 | |
| 264 /* Begin thread_private.h kluge */ | |
| 265 /* | |
| 266 * These come out of (or should go into) thread_private.h - rather than have | |
| 267 * to copy (or symlink) the files from the source tree these definitions are | |
| 268 * inlined here. Obviously these go away when this module is part of libc. | |
| 269 */ | |
| 270 struct sem { | |
| 271 #define SEM_MAGIC ((u_int32_t) 0x09fa4012) | |
| 272 u_int32_t magic; | |
| 273 pthread_mutex_t lock; | |
| 274 pthread_cond_t gtzero; | |
| 275 u_int32_t count; | |
| 276 u_int32_t nwaiters; | |
| 277 }; | |
| 278 | |
| 279 extern pthread_once_t _thread_init_once; | |
| 280 extern int _threads_initialized; | |
| 281 extern void _thread_init __P((void)); | |
| 282 #define THREAD_INIT() \ | |
| 283 (void) pthread_once(&_thread_init_once, _thread_init) | |
| 284 #define THREAD_SAFE() \ | |
| 285 (_threads_initialized != 0) | |
| 286 | |
| 287 #define _SEM_CHECK_VALIDITY(sem) \ | |
| 288 if ((*(sem))->magic != SEM_MAGIC) { \ | |
| 289 errno = EINVAL; \ | |
| 290 retval = -1; \ | |
| 291 goto RETURN; \ | |
| 292 } | |
| 293 /* End thread_private.h kluge */ | |
| 294 | |
| 295 int | |
| 296 sem_init(sem_t *sem, int pshared, unsigned int value) | |
| 297 { | |
| 298 int retval; | |
| 299 | |
| 300 if (!THREAD_SAFE()) | |
| 301 THREAD_INIT(); | |
| 302 | |
| 303 /* | |
| 304 * Range check the arguments. | |
| 305 */ | |
| 306 if (pshared != 0) { | |
| 307 /* | |
| 308 * The user wants a semaphore that can be shared among | |
| 309 * processes, which this implementation can't do. Sounds like a | |
| 310 * permissions problem to me (yeah right). | |
| 311 */ | |
| 312 errno = EPERM; | |
| 313 retval = -1; | |
| 314 goto RETURN; | |
| 315 } | |
| 316 | |
| 317 if (value > SEM_VALUE_MAX) { | |
| 318 errno = EINVAL; | |
| 319 retval = -1; | |
| 320 goto RETURN; | |
| 321 } | |
| 322 | |
|
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3692456e7b0f
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Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
323 *sem = (sem_t)SDL_malloc(sizeof(struct sem)); |
| 256 | 324 if (*sem == NULL) { |
| 325 errno = ENOSPC; | |
| 326 retval = -1; | |
| 327 goto RETURN; | |
| 328 } | |
| 329 | |
| 330 /* | |
| 331 * Initialize the semaphore. | |
| 332 */ | |
| 333 if (pthread_mutex_init(&(*sem)->lock, NULL) != 0) { | |
|
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parents:
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diff
changeset
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334 SDL_free(*sem); |
| 256 | 335 errno = ENOSPC; |
| 336 retval = -1; | |
| 337 goto RETURN; | |
| 338 } | |
| 339 | |
| 340 if (pthread_cond_init(&(*sem)->gtzero, NULL) != 0) { | |
| 341 pthread_mutex_destroy(&(*sem)->lock); | |
|
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Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
342 SDL_free(*sem); |
| 256 | 343 errno = ENOSPC; |
| 344 retval = -1; | |
| 345 goto RETURN; | |
| 346 } | |
| 347 | |
| 348 (*sem)->count = (u_int32_t)value; | |
| 349 (*sem)->nwaiters = 0; | |
| 350 (*sem)->magic = SEM_MAGIC; | |
| 351 | |
| 352 retval = 0; | |
| 353 RETURN: | |
| 354 return retval; | |
| 355 } | |
| 356 | |
| 357 int | |
| 358 sem_destroy(sem_t *sem) | |
| 359 { | |
| 360 int retval; | |
| 361 | |
| 362 _SEM_CHECK_VALIDITY(sem); | |
| 363 | |
| 364 /* Make sure there are no waiters. */ | |
| 365 pthread_mutex_lock(&(*sem)->lock); | |
| 366 if ((*sem)->nwaiters > 0) { | |
| 367 pthread_mutex_unlock(&(*sem)->lock); | |
| 368 errno = EBUSY; | |
| 369 retval = -1; | |
| 370 goto RETURN; | |
| 371 } | |
| 372 pthread_mutex_unlock(&(*sem)->lock); | |
| 373 | |
| 374 pthread_mutex_destroy(&(*sem)->lock); | |
| 375 pthread_cond_destroy(&(*sem)->gtzero); | |
| 376 (*sem)->magic = 0; | |
| 377 | |
|
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Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
378 SDL_free(*sem); |
| 256 | 379 |
| 380 retval = 0; | |
| 381 RETURN: | |
| 382 return retval; | |
| 383 } | |
| 384 | |
| 385 sem_t * | |
| 386 sem_open(const char *name, int oflag, ...) | |
| 387 { | |
| 388 errno = ENOSYS; | |
| 389 return SEM_FAILED; | |
| 390 } | |
| 391 | |
| 392 int | |
| 393 sem_close(sem_t *sem) | |
| 394 { | |
| 395 errno = ENOSYS; | |
| 396 return -1; | |
| 397 } | |
| 398 | |
| 399 int | |
| 400 sem_unlink(const char *name) | |
| 401 { | |
| 402 errno = ENOSYS; | |
| 403 return -1; | |
| 404 } | |
| 405 | |
| 406 int | |
| 407 sem_wait(sem_t *sem) | |
| 408 { | |
| 409 int retval; | |
| 410 | |
| 411 pthread_testcancel(); | |
| 412 | |
| 413 _SEM_CHECK_VALIDITY(sem); | |
| 414 | |
| 415 pthread_mutex_lock(&(*sem)->lock); | |
| 416 | |
| 417 while ((*sem)->count == 0) { | |
| 418 (*sem)->nwaiters++; | |
| 419 pthread_cond_wait(&(*sem)->gtzero, &(*sem)->lock); | |
| 420 (*sem)->nwaiters--; | |
| 421 } | |
| 422 (*sem)->count--; | |
| 423 | |
| 424 pthread_mutex_unlock(&(*sem)->lock); | |
| 425 | |
| 426 retval = 0; | |
| 427 RETURN: | |
| 428 | |
| 429 pthread_testcancel(); | |
| 430 return retval; | |
| 431 } | |
| 432 | |
| 433 int | |
| 434 sem_trywait(sem_t *sem) | |
| 435 { | |
| 436 int retval; | |
| 437 | |
| 438 _SEM_CHECK_VALIDITY(sem); | |
| 439 | |
| 440 pthread_mutex_lock(&(*sem)->lock); | |
| 441 | |
| 442 if ((*sem)->count > 0) { | |
| 443 (*sem)->count--; | |
| 444 retval = 0; | |
| 445 } else { | |
| 446 errno = EAGAIN; | |
| 447 retval = -1; | |
| 448 } | |
| 449 | |
| 450 pthread_mutex_unlock(&(*sem)->lock); | |
| 451 | |
| 452 RETURN: | |
| 453 return retval; | |
| 454 } | |
| 455 | |
| 456 int | |
| 457 sem_post(sem_t *sem) | |
| 458 { | |
| 459 int retval; | |
| 460 | |
| 461 _SEM_CHECK_VALIDITY(sem); | |
| 462 | |
| 463 pthread_mutex_lock(&(*sem)->lock); | |
| 464 | |
| 465 (*sem)->count++; | |
| 466 if ((*sem)->nwaiters > 0) { | |
| 467 /* | |
| 468 * We must use pthread_cond_broadcast() rather than | |
| 469 * pthread_cond_signal() in order to assure that the highest | |
| 470 * priority thread is run by the scheduler, since | |
| 471 * pthread_cond_signal() signals waiting threads in FIFO order. | |
| 472 */ | |
| 473 pthread_cond_broadcast(&(*sem)->gtzero); | |
| 474 } | |
| 475 | |
| 476 pthread_mutex_unlock(&(*sem)->lock); | |
| 477 | |
| 478 retval = 0; | |
| 479 RETURN: | |
| 480 return retval; | |
| 481 } | |
| 482 | |
| 483 int | |
| 484 sem_getvalue(sem_t *sem, int *sval) | |
| 485 { | |
| 486 int retval; | |
| 487 | |
| 488 _SEM_CHECK_VALIDITY(sem); | |
| 489 | |
| 490 pthread_mutex_lock(&(*sem)->lock); | |
| 491 *sval = (int)(*sem)->count; | |
| 492 pthread_mutex_unlock(&(*sem)->lock); | |
| 493 | |
| 494 retval = 0; | |
| 495 RETURN: | |
| 496 return retval; | |
| 497 } | |
| 498 | |
| 499 /* END of inlined uthread_sem.c */ | |
| 500 #endif /* SDL_USE_PTHREADS */ |