Mercurial > sdl-ios-xcode
annotate src/thread/bsdi/SDL_syssem.c @ 1336:3692456e7b0f
Use SDL_ prefixed versions of C library functions.
FIXME:
Change #include <stdlib.h> to #include "SDL_stdlib.h"
Change #include <string.h> to #include "SDL_string.h"
Make sure nothing else broke because of this...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 06:59:48 +0000 |
| parents | c9b51268668f |
| children | 604d73db6802 |
| 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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13 Lesser General Public License for more details. |
| 256 | 14 |
|
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parents:
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15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
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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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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 | |
| 23 #include <stdlib.h> | |
| 24 #include "SDL_error.h" | |
| 25 #include "SDL_thread.h" | |
| 26 #include "SDL_timer.h" | |
| 27 | |
| 28 #ifdef SDL_USE_PTHREADS | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <unistd.h> /* For getpid() */ | |
| 33 #include <pthread.h> | |
| 34 | |
| 35 | |
| 36 /* | |
| 37 * This is semaphore.h inlined here so that BSD/OS POSIX semaphore are | |
| 38 * completely selfcontained without requiring any additional include files | |
| 39 * or libraries not present in the stock system | |
| 40 */ | |
| 41 | |
| 42 /* semaphore.h: POSIX 1003.1b semaphores */ | |
| 43 | |
| 44 /*- | |
| 45 * Copyright (c) 1996, 1997 | |
| 46 * HD Associates, Inc. All rights reserved. | |
| 47 * | |
| 48 * Redistribution and use in source and binary forms, with or without | |
| 49 * modification, are permitted provided that the following conditions | |
| 50 * are met: | |
| 51 * 1. Redistributions of source code must retain the above copyright | |
| 52 * notice, this list of conditions and the following disclaimer. | |
| 53 * 2. Redistributions in binary form must reproduce the above copyright | |
| 54 * notice, this list of conditions and the following disclaimer in the | |
| 55 * documentation and/or other materials provided with the distribution. | |
| 56 * 3. All advertising materials mentioning features or use of this software | |
| 57 * must display the following acknowledgement: | |
| 58 * This product includes software developed by HD Associates, Inc | |
| 59 * 4. Neither the name of the author nor the names of any co-contributors | |
| 60 * may be used to endorse or promote products derived from this software | |
| 61 * without specific prior written permission. | |
| 62 * | |
| 63 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND | |
| 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 66 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE | |
| 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 73 * SUCH DAMAGE. | |
| 74 * | |
| 75 * $FreeBSD: src/sys/posix4/semaphore.h,v 1.6 2000/01/20 07:55:42 jasone Exp $ | |
| 76 */ | |
| 77 | |
| 78 #include <machine/limits.h> | |
| 79 | |
| 80 #include <sys/types.h> | |
| 81 #include <fcntl.h> | |
| 82 | |
| 83 /* Opaque type definition. */ | |
| 84 struct sem; | |
| 85 typedef struct sem *sem_t; | |
| 86 | |
| 87 #define SEM_FAILED ((sem_t *)0) | |
| 88 #define SEM_VALUE_MAX UINT_MAX | |
| 89 | |
| 90 #include <sys/cdefs.h> | |
| 91 | |
| 92 __BEGIN_DECLS | |
| 93 int sem_init __P((sem_t *, int, unsigned int)); | |
| 94 int sem_destroy __P((sem_t *)); | |
| 95 sem_t *sem_open __P((const char *, int, ...)); | |
| 96 int sem_close __P((sem_t *)); | |
| 97 int sem_unlink __P((const char *)); | |
| 98 int sem_wait __P((sem_t *)); | |
| 99 int sem_trywait __P((sem_t *)); | |
| 100 int sem_post __P((sem_t *)); | |
| 101 int sem_getvalue __P((sem_t *, int *)); | |
| 102 __END_DECLS | |
| 103 | |
| 104 /* END of inlined semaphore.h */ | |
| 105 | |
| 106 /* Wrapper around POSIX 1003.1b semaphores */ | |
| 107 | |
| 108 struct SDL_semaphore { | |
| 109 sem_t *sem; | |
| 110 sem_t sem_data; | |
| 111 }; | |
| 112 | |
| 113 /* Create a semaphore, initialized with value */ | |
| 114 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 115 { | |
|
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116 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); |
| 256 | 117 if ( sem ) { |
| 118 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) { | |
| 119 SDL_SetError("sem_init() failed"); | |
|
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parents:
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diff
changeset
|
120 SDL_free(sem); |
| 256 | 121 sem = NULL; |
| 122 } else { | |
| 123 sem->sem = &sem->sem_data; | |
| 124 } | |
| 125 } else { | |
| 126 SDL_OutOfMemory(); | |
| 127 } | |
| 128 return sem; | |
| 129 } | |
| 130 | |
| 131 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 132 { | |
| 133 if ( sem ) { | |
| 134 sem_destroy(sem->sem); | |
|
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Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
|
135 SDL_free(sem); |
| 256 | 136 } |
| 137 } | |
| 138 | |
| 139 int SDL_SemTryWait(SDL_sem *sem) | |
| 140 { | |
| 141 int retval; | |
| 142 | |
| 143 if ( ! sem ) { | |
| 144 SDL_SetError("Passed a NULL semaphore"); | |
| 145 return -1; | |
| 146 } | |
| 147 retval = SDL_MUTEX_TIMEDOUT; | |
| 148 if ( sem_trywait(sem->sem) == 0 ) | |
| 149 retval = 0; | |
| 150 return retval; | |
| 151 } | |
| 152 | |
| 153 int SDL_SemWait(SDL_sem *sem) | |
| 154 { | |
| 155 int retval; | |
| 156 | |
| 157 if ( ! sem ) { | |
| 158 SDL_SetError("Passed a NULL semaphore"); | |
| 159 return -1; | |
| 160 } | |
| 161 | |
| 162 retval = sem_wait(sem->sem); | |
| 163 if ( retval < 0 ) { | |
| 164 SDL_SetError("sem_wait() failed"); | |
| 165 } | |
| 166 return retval; | |
| 167 } | |
| 168 | |
| 169 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 170 { | |
| 171 int retval; | |
| 172 | |
| 173 if ( ! sem ) { | |
| 174 SDL_SetError("Passed a NULL semaphore"); | |
| 175 return -1; | |
| 176 } | |
| 177 | |
| 178 /* Try the easy cases first */ | |
| 179 if ( timeout == 0 ) { | |
| 180 return SDL_SemTryWait(sem); | |
| 181 } | |
| 182 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 183 return SDL_SemWait(sem); | |
| 184 } | |
| 185 | |
| 186 /* Ack! We have to busy wait... */ | |
| 187 timeout += SDL_GetTicks(); | |
| 188 do { | |
| 189 retval = SDL_SemTryWait(sem); | |
| 190 if ( retval == 0 ) { | |
| 191 break; | |
| 192 } | |
| 193 SDL_Delay(1); | |
| 194 } while ( SDL_GetTicks() < timeout ); | |
| 195 | |
| 196 return retval; | |
| 197 } | |
| 198 | |
| 199 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 200 { | |
| 201 int ret = 0; | |
| 202 if ( sem ) { | |
| 203 sem_getvalue(sem->sem, &ret); | |
| 204 if ( ret < 0 ) { | |
| 205 ret = 0; | |
| 206 } | |
| 207 } | |
| 208 return (Uint32)ret; | |
| 209 } | |
| 210 | |
| 211 int SDL_SemPost(SDL_sem *sem) | |
| 212 { | |
| 213 int retval; | |
| 214 | |
| 215 if ( ! sem ) { | |
| 216 SDL_SetError("Passed a NULL semaphore"); | |
| 217 return -1; | |
| 218 } | |
| 219 | |
| 220 retval = sem_post(sem->sem); | |
| 221 if ( retval < 0 ) { | |
| 222 SDL_SetError("sem_post() failed"); | |
| 223 } | |
| 224 return retval; | |
| 225 } | |
| 226 | |
| 227 /* | |
| 228 * BEGIN inlined uthread_sem.c. This is done here so that no extra libraries | |
| 229 * or include files not present in BSD/OS are required | |
| 230 */ | |
| 231 | |
| 232 /* | |
| 233 * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>. | |
| 234 * All rights reserved. | |
| 235 * | |
| 236 * Redistribution and use in source and binary forms, with or without | |
| 237 * modification, are permitted provided that the following conditions | |
| 238 * are met: | |
| 239 * 1. Redistributions of source code must retain the above copyright | |
| 240 * notice(s), this list of conditions and the following disclaimer as | |
| 241 * the first lines of this file unmodified other than the possible | |
| 242 * addition of one or more copyright notices. | |
| 243 * 2. Redistributions in binary form must reproduce the above copyright | |
| 244 * notice(s), this list of conditions and the following disclaimer in | |
| 245 * the documentation and/or other materials provided with the | |
| 246 * distribution. | |
| 247 * | |
| 248 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY | |
| 249 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 250 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 251 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE | |
| 252 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 253 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 254 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
| 255 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 256 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE | |
| 257 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
| 258 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 259 * | |
| 260 * $FreeBSD: src/lib/libc_r/uthread/uthread_sem.c,v 1.3.2.1 2000/07/18 02:05:57 jasone Exp $ | |
| 261 */ | |
| 262 | |
| 263 #include <errno.h> | |
| 264 #include <pthread.h> | |
| 265 | |
| 266 /* Begin thread_private.h kluge */ | |
| 267 /* | |
| 268 * These come out of (or should go into) thread_private.h - rather than have | |
| 269 * to copy (or symlink) the files from the source tree these definitions are | |
| 270 * inlined here. Obviously these go away when this module is part of libc. | |
| 271 */ | |
| 272 struct sem { | |
| 273 #define SEM_MAGIC ((u_int32_t) 0x09fa4012) | |
| 274 u_int32_t magic; | |
| 275 pthread_mutex_t lock; | |
| 276 pthread_cond_t gtzero; | |
| 277 u_int32_t count; | |
| 278 u_int32_t nwaiters; | |
| 279 }; | |
| 280 | |
| 281 extern pthread_once_t _thread_init_once; | |
| 282 extern int _threads_initialized; | |
| 283 extern void _thread_init __P((void)); | |
| 284 #define THREAD_INIT() \ | |
| 285 (void) pthread_once(&_thread_init_once, _thread_init) | |
| 286 #define THREAD_SAFE() \ | |
| 287 (_threads_initialized != 0) | |
| 288 | |
| 289 #define _SEM_CHECK_VALIDITY(sem) \ | |
| 290 if ((*(sem))->magic != SEM_MAGIC) { \ | |
| 291 errno = EINVAL; \ | |
| 292 retval = -1; \ | |
| 293 goto RETURN; \ | |
| 294 } | |
| 295 /* End thread_private.h kluge */ | |
| 296 | |
| 297 int | |
| 298 sem_init(sem_t *sem, int pshared, unsigned int value) | |
| 299 { | |
| 300 int retval; | |
| 301 | |
| 302 if (!THREAD_SAFE()) | |
| 303 THREAD_INIT(); | |
| 304 | |
| 305 /* | |
| 306 * Range check the arguments. | |
| 307 */ | |
| 308 if (pshared != 0) { | |
| 309 /* | |
| 310 * The user wants a semaphore that can be shared among | |
| 311 * processes, which this implementation can't do. Sounds like a | |
| 312 * permissions problem to me (yeah right). | |
| 313 */ | |
| 314 errno = EPERM; | |
| 315 retval = -1; | |
| 316 goto RETURN; | |
| 317 } | |
| 318 | |
| 319 if (value > SEM_VALUE_MAX) { | |
| 320 errno = EINVAL; | |
| 321 retval = -1; | |
| 322 goto RETURN; | |
| 323 } | |
| 324 | |
|
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3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
325 *sem = (sem_t)SDL_malloc(sizeof(struct sem)); |
| 256 | 326 if (*sem == NULL) { |
| 327 errno = ENOSPC; | |
| 328 retval = -1; | |
| 329 goto RETURN; | |
| 330 } | |
| 331 | |
| 332 /* | |
| 333 * Initialize the semaphore. | |
| 334 */ | |
| 335 if (pthread_mutex_init(&(*sem)->lock, NULL) != 0) { | |
|
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parents:
1312
diff
changeset
|
336 SDL_free(*sem); |
| 256 | 337 errno = ENOSPC; |
| 338 retval = -1; | |
| 339 goto RETURN; | |
| 340 } | |
| 341 | |
| 342 if (pthread_cond_init(&(*sem)->gtzero, NULL) != 0) { | |
| 343 pthread_mutex_destroy(&(*sem)->lock); | |
|
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Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
344 SDL_free(*sem); |
| 256 | 345 errno = ENOSPC; |
| 346 retval = -1; | |
| 347 goto RETURN; | |
| 348 } | |
| 349 | |
| 350 (*sem)->count = (u_int32_t)value; | |
| 351 (*sem)->nwaiters = 0; | |
| 352 (*sem)->magic = SEM_MAGIC; | |
| 353 | |
| 354 retval = 0; | |
| 355 RETURN: | |
| 356 return retval; | |
| 357 } | |
| 358 | |
| 359 int | |
| 360 sem_destroy(sem_t *sem) | |
| 361 { | |
| 362 int retval; | |
| 363 | |
| 364 _SEM_CHECK_VALIDITY(sem); | |
| 365 | |
| 366 /* Make sure there are no waiters. */ | |
| 367 pthread_mutex_lock(&(*sem)->lock); | |
| 368 if ((*sem)->nwaiters > 0) { | |
| 369 pthread_mutex_unlock(&(*sem)->lock); | |
| 370 errno = EBUSY; | |
| 371 retval = -1; | |
| 372 goto RETURN; | |
| 373 } | |
| 374 pthread_mutex_unlock(&(*sem)->lock); | |
| 375 | |
| 376 pthread_mutex_destroy(&(*sem)->lock); | |
| 377 pthread_cond_destroy(&(*sem)->gtzero); | |
| 378 (*sem)->magic = 0; | |
| 379 | |
|
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3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
380 SDL_free(*sem); |
| 256 | 381 |
| 382 retval = 0; | |
| 383 RETURN: | |
| 384 return retval; | |
| 385 } | |
| 386 | |
| 387 sem_t * | |
| 388 sem_open(const char *name, int oflag, ...) | |
| 389 { | |
| 390 errno = ENOSYS; | |
| 391 return SEM_FAILED; | |
| 392 } | |
| 393 | |
| 394 int | |
| 395 sem_close(sem_t *sem) | |
| 396 { | |
| 397 errno = ENOSYS; | |
| 398 return -1; | |
| 399 } | |
| 400 | |
| 401 int | |
| 402 sem_unlink(const char *name) | |
| 403 { | |
| 404 errno = ENOSYS; | |
| 405 return -1; | |
| 406 } | |
| 407 | |
| 408 int | |
| 409 sem_wait(sem_t *sem) | |
| 410 { | |
| 411 int retval; | |
| 412 | |
| 413 pthread_testcancel(); | |
| 414 | |
| 415 _SEM_CHECK_VALIDITY(sem); | |
| 416 | |
| 417 pthread_mutex_lock(&(*sem)->lock); | |
| 418 | |
| 419 while ((*sem)->count == 0) { | |
| 420 (*sem)->nwaiters++; | |
| 421 pthread_cond_wait(&(*sem)->gtzero, &(*sem)->lock); | |
| 422 (*sem)->nwaiters--; | |
| 423 } | |
| 424 (*sem)->count--; | |
| 425 | |
| 426 pthread_mutex_unlock(&(*sem)->lock); | |
| 427 | |
| 428 retval = 0; | |
| 429 RETURN: | |
| 430 | |
| 431 pthread_testcancel(); | |
| 432 return retval; | |
| 433 } | |
| 434 | |
| 435 int | |
| 436 sem_trywait(sem_t *sem) | |
| 437 { | |
| 438 int retval; | |
| 439 | |
| 440 _SEM_CHECK_VALIDITY(sem); | |
| 441 | |
| 442 pthread_mutex_lock(&(*sem)->lock); | |
| 443 | |
| 444 if ((*sem)->count > 0) { | |
| 445 (*sem)->count--; | |
| 446 retval = 0; | |
| 447 } else { | |
| 448 errno = EAGAIN; | |
| 449 retval = -1; | |
| 450 } | |
| 451 | |
| 452 pthread_mutex_unlock(&(*sem)->lock); | |
| 453 | |
| 454 RETURN: | |
| 455 return retval; | |
| 456 } | |
| 457 | |
| 458 int | |
| 459 sem_post(sem_t *sem) | |
| 460 { | |
| 461 int retval; | |
| 462 | |
| 463 _SEM_CHECK_VALIDITY(sem); | |
| 464 | |
| 465 pthread_mutex_lock(&(*sem)->lock); | |
| 466 | |
| 467 (*sem)->count++; | |
| 468 if ((*sem)->nwaiters > 0) { | |
| 469 /* | |
| 470 * We must use pthread_cond_broadcast() rather than | |
| 471 * pthread_cond_signal() in order to assure that the highest | |
| 472 * priority thread is run by the scheduler, since | |
| 473 * pthread_cond_signal() signals waiting threads in FIFO order. | |
| 474 */ | |
| 475 pthread_cond_broadcast(&(*sem)->gtzero); | |
| 476 } | |
| 477 | |
| 478 pthread_mutex_unlock(&(*sem)->lock); | |
| 479 | |
| 480 retval = 0; | |
| 481 RETURN: | |
| 482 return retval; | |
| 483 } | |
| 484 | |
| 485 int | |
| 486 sem_getvalue(sem_t *sem, int *sval) | |
| 487 { | |
| 488 int retval; | |
| 489 | |
| 490 _SEM_CHECK_VALIDITY(sem); | |
| 491 | |
| 492 pthread_mutex_lock(&(*sem)->lock); | |
| 493 *sval = (int)(*sem)->count; | |
| 494 pthread_mutex_unlock(&(*sem)->lock); | |
| 495 | |
| 496 retval = 0; | |
| 497 RETURN: | |
| 498 return retval; | |
| 499 } | |
| 500 | |
| 501 /* END of inlined uthread_sem.c */ | |
| 502 #endif /* SDL_USE_PTHREADS */ |