t_mutex.c revision 1.10
1 /* $NetBSD: t_mutex.c,v 1.10 2016/07/31 13:01:29 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __COPYRIGHT("@(#) Copyright (c) 2008\ 31 The NetBSD Foundation, inc. All rights reserved."); 32 __RCSID("$NetBSD: t_mutex.c,v 1.10 2016/07/31 13:01:29 christos Exp $"); 33 34 #include <pthread.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <errno.h> 38 #include <unistd.h> 39 #include <sys/sched.h> 40 #include <sys/param.h> 41 42 #include <atf-c.h> 43 44 #include "h_common.h" 45 46 static pthread_mutex_t mutex; 47 static pthread_mutex_t static_mutex = PTHREAD_MUTEX_INITIALIZER; 48 static int global_x; 49 50 static void * 51 mutex1_threadfunc(void *arg) 52 { 53 int *param; 54 55 printf("2: Second thread.\n"); 56 57 param = arg; 58 printf("2: Locking mutex\n"); 59 pthread_mutex_lock(&mutex); 60 printf("2: Got mutex. *param = %d\n", *param); 61 ATF_REQUIRE_EQ(*param, 20); 62 (*param)++; 63 64 pthread_mutex_unlock(&mutex); 65 66 return param; 67 } 68 69 ATF_TC(mutex1); 70 ATF_TC_HEAD(mutex1, tc) 71 { 72 atf_tc_set_md_var(tc, "descr", "Checks mutexes"); 73 } 74 ATF_TC_BODY(mutex1, tc) 75 { 76 int x; 77 pthread_t new; 78 void *joinval; 79 80 printf("1: Mutex-test 1\n"); 81 82 PTHREAD_REQUIRE(pthread_mutex_init(&mutex, NULL)); 83 x = 1; 84 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 85 PTHREAD_REQUIRE(pthread_create(&new, NULL, mutex1_threadfunc, &x)); 86 printf("1: Before changing the value.\n"); 87 sleep(2); 88 x = 20; 89 printf("1: Before releasing the mutex.\n"); 90 sleep(2); 91 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 92 printf("1: After releasing the mutex.\n"); 93 PTHREAD_REQUIRE(pthread_join(new, &joinval)); 94 95 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 96 printf("1: Thread joined. X was %d. Return value (int) was %d\n", 97 x, *(int *)joinval); 98 ATF_REQUIRE_EQ(x, 21); 99 ATF_REQUIRE_EQ(*(int *)joinval, 21); 100 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 101 } 102 103 static void * 104 mutex2_threadfunc(void *arg) 105 { 106 long count = *(int *)arg; 107 108 printf("2: Second thread (%p). Count is %ld\n", pthread_self(), count); 109 110 while (count--) { 111 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 112 global_x++; 113 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 114 } 115 116 return (void *)count; 117 } 118 119 ATF_TC(mutex2); 120 ATF_TC_HEAD(mutex2, tc) 121 { 122 atf_tc_set_md_var(tc, "descr", "Checks mutexes"); 123 #if defined(__powerpc__) 124 atf_tc_set_md_var(tc, "timeout", "40"); 125 #endif 126 } 127 ATF_TC_BODY(mutex2, tc) 128 { 129 int count, count2; 130 pthread_t new; 131 void *joinval; 132 133 printf("1: Mutex-test 2\n"); 134 135 #if defined(__powerpc__) 136 atf_tc_expect_timeout("PR port-powerpc/44387"); 137 #endif 138 139 PTHREAD_REQUIRE(pthread_mutex_init(&mutex, NULL)); 140 141 global_x = 0; 142 count = count2 = 10000000; 143 144 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 145 PTHREAD_REQUIRE(pthread_create(&new, NULL, mutex2_threadfunc, &count2)); 146 147 printf("1: Thread %p\n", pthread_self()); 148 149 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 150 151 while (count--) { 152 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 153 global_x++; 154 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 155 } 156 157 PTHREAD_REQUIRE(pthread_join(new, &joinval)); 158 159 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 160 printf("1: Thread joined. X was %d. Return value (long) was %ld\n", 161 global_x, (long)joinval); 162 ATF_REQUIRE_EQ(global_x, 20000000); 163 164 #if defined(__powerpc__) 165 /* XXX force a timeout in ppc case since an un-triggered race 166 otherwise looks like a "failure" */ 167 /* We sleep for longer than the timeout to make ATF not 168 complain about unexpected success */ 169 sleep(41); 170 #endif 171 } 172 173 static void * 174 mutex3_threadfunc(void *arg) 175 { 176 long count = *(int *)arg; 177 178 printf("2: Second thread (%p). Count is %ld\n", pthread_self(), count); 179 180 while (count--) { 181 PTHREAD_REQUIRE(pthread_mutex_lock(&static_mutex)); 182 global_x++; 183 PTHREAD_REQUIRE(pthread_mutex_unlock(&static_mutex)); 184 } 185 186 return (void *)count; 187 } 188 189 ATF_TC(mutex3); 190 ATF_TC_HEAD(mutex3, tc) 191 { 192 atf_tc_set_md_var(tc, "descr", "Checks mutexes using a static " 193 "initializer"); 194 #if defined(__powerpc__) 195 atf_tc_set_md_var(tc, "timeout", "40"); 196 #endif 197 } 198 ATF_TC_BODY(mutex3, tc) 199 { 200 int count, count2; 201 pthread_t new; 202 void *joinval; 203 204 printf("1: Mutex-test 3\n"); 205 206 #if defined(__powerpc__) 207 atf_tc_expect_timeout("PR port-powerpc/44387"); 208 #endif 209 210 global_x = 0; 211 count = count2 = 10000000; 212 213 PTHREAD_REQUIRE(pthread_mutex_lock(&static_mutex)); 214 PTHREAD_REQUIRE(pthread_create(&new, NULL, mutex3_threadfunc, &count2)); 215 216 printf("1: Thread %p\n", pthread_self()); 217 218 PTHREAD_REQUIRE(pthread_mutex_unlock(&static_mutex)); 219 220 while (count--) { 221 PTHREAD_REQUIRE(pthread_mutex_lock(&static_mutex)); 222 global_x++; 223 PTHREAD_REQUIRE(pthread_mutex_unlock(&static_mutex)); 224 } 225 226 PTHREAD_REQUIRE(pthread_join(new, &joinval)); 227 228 PTHREAD_REQUIRE(pthread_mutex_lock(&static_mutex)); 229 printf("1: Thread joined. X was %d. Return value (long) was %ld\n", 230 global_x, (long)joinval); 231 ATF_REQUIRE_EQ(global_x, 20000000); 232 233 #if defined(__powerpc__) 234 /* XXX force a timeout in ppc case since an un-triggered race 235 otherwise looks like a "failure" */ 236 /* We sleep for longer than the timeout to make ATF not 237 complain about unexpected success */ 238 sleep(41); 239 #endif 240 } 241 242 static void * 243 mutex4_threadfunc(void *arg) 244 { 245 int *param; 246 247 printf("2: Second thread.\n"); 248 249 param = arg; 250 printf("2: Locking mutex\n"); 251 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 252 printf("2: Got mutex. *param = %d\n", *param); 253 (*param)++; 254 255 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 256 257 return param; 258 } 259 260 ATF_TC(mutex4); 261 ATF_TC_HEAD(mutex4, tc) 262 { 263 atf_tc_set_md_var(tc, "descr", "Checks mutexes"); 264 } 265 ATF_TC_BODY(mutex4, tc) 266 { 267 int x; 268 pthread_t new; 269 pthread_mutexattr_t mattr; 270 void *joinval; 271 272 printf("1: Mutex-test 4\n"); 273 274 PTHREAD_REQUIRE(pthread_mutexattr_init(&mattr)); 275 PTHREAD_REQUIRE(pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_RECURSIVE)); 276 277 PTHREAD_REQUIRE(pthread_mutex_init(&mutex, &mattr)); 278 279 PTHREAD_REQUIRE(pthread_mutexattr_destroy(&mattr)); 280 281 x = 1; 282 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 283 PTHREAD_REQUIRE(pthread_create(&new, NULL, mutex4_threadfunc, &x)); 284 285 printf("1: Before recursively acquiring the mutex.\n"); 286 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 287 288 printf("1: Before releasing the mutex once.\n"); 289 sleep(2); 290 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 291 printf("1: After releasing the mutex once.\n"); 292 293 x = 20; 294 295 printf("1: Before releasing the mutex twice.\n"); 296 sleep(2); 297 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 298 printf("1: After releasing the mutex twice.\n"); 299 300 PTHREAD_REQUIRE(pthread_join(new, &joinval)); 301 302 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex)); 303 printf("1: Thread joined. X was %d. Return value (int) was %d\n", 304 x, *(int *)joinval); 305 ATF_REQUIRE_EQ(x, 21); 306 ATF_REQUIRE_EQ(*(int *)joinval, 21); 307 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex)); 308 } 309 310 static pthread_mutexattr_t attr5; 311 static pthread_mutex_t mutex5; 312 static int min_fifo_prio, max_fifo_prio; 313 314 static void * 315 child_func(void* arg) 316 { 317 int res; 318 319 printf("child is waiting\n"); 320 res = _sched_protect(-2); 321 ATF_REQUIRE_EQ_MSG(res, -1, "sched_protect returned %d", res); 322 ATF_REQUIRE_EQ(errno, ENOENT); 323 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex5)); 324 printf("child is owning resource\n"); 325 res = _sched_protect(-2); 326 ATF_REQUIRE_EQ(res, max_fifo_prio); 327 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex5)); 328 printf("child is done\n"); 329 330 return 0; 331 } 332 333 ATF_TC(mutex5); 334 ATF_TC_HEAD(mutex5, tc) 335 { 336 atf_tc_set_md_var(tc, "descr", "Checks mutexes for priority setting"); 337 atf_tc_set_md_var(tc, "require.user", "root"); 338 } 339 340 ATF_TC_BODY(mutex5, tc) 341 { 342 int res; 343 struct sched_param param; 344 pthread_t child; 345 346 min_fifo_prio = sched_get_priority_min(SCHED_FIFO); 347 max_fifo_prio = sched_get_priority_max(SCHED_FIFO); 348 printf("min prio for FIFO = %d\n", min_fifo_prio); 349 param.sched_priority = min_fifo_prio; 350 351 /* = 0 OTHER, 1 FIFO, 2 RR, -1 NONE */ 352 res = sched_setscheduler(getpid(), SCHED_FIFO, ¶m); 353 printf("previous policy used = %d\n", res); 354 355 res = sched_getscheduler(getpid()); 356 ATF_REQUIRE_EQ_MSG(res, SCHED_FIFO, "sched %d != FIFO %d", res, 357 SCHED_FIFO); 358 359 PTHREAD_REQUIRE(pthread_mutexattr_init(&attr5)); 360 PTHREAD_REQUIRE(pthread_mutexattr_setprotocol(&attr5, 361 PTHREAD_PRIO_PROTECT)); 362 PTHREAD_REQUIRE(pthread_mutexattr_setprioceiling(&attr5, 363 max_fifo_prio)); 364 365 PTHREAD_REQUIRE(pthread_mutex_init(&mutex5, &attr5)); 366 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex5)); 367 printf("enter critical section for main\n"); 368 PTHREAD_REQUIRE(pthread_create(&child, NULL, child_func, NULL)); 369 printf("main starts to sleep\n"); 370 sleep(10); 371 printf("main completes\n"); 372 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex5)); 373 PTHREAD_REQUIRE(pthread_join(child, NULL)); 374 } 375 376 static pthread_mutex_t mutex6; 377 static int start = 0; 378 static uintmax_t high_cnt = 0, low_cnt = 0, MAX_LOOP = 100000000; 379 380 static void * 381 high_prio(void* arg) 382 { 383 struct sched_param param; 384 int policy; 385 param.sched_priority = min_fifo_prio + 10; 386 pthread_t childid = pthread_self(); 387 388 PTHREAD_REQUIRE(pthread_setschedparam(childid, 1, ¶m)); 389 PTHREAD_REQUIRE(pthread_getschedparam(childid, &policy, ¶m)); 390 printf("high protect = %d, prio = %d\n", 391 _sched_protect(-2), param.sched_priority); 392 ATF_REQUIRE_EQ(policy, 1); 393 printf("high prio = %d\n", param.sched_priority); 394 sleep(1); 395 long tmp = 0; 396 for (int i = 0; i < 20; i++) { 397 while (high_cnt < MAX_LOOP) { 398 tmp += (123456789 % 1234) * (987654321 % 54321); 399 high_cnt += 1; 400 } 401 high_cnt = 0; 402 sleep(1); 403 } 404 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex6)); 405 if (start == 0) start = 2; 406 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex6)); 407 408 return 0; 409 } 410 411 static void * 412 low_prio(void* arg) 413 { 414 struct sched_param param; 415 int policy; 416 param.sched_priority = min_fifo_prio; 417 pthread_t childid = pthread_self(); 418 int res = _sched_protect(max_fifo_prio); 419 ATF_REQUIRE_EQ(res, 0); 420 PTHREAD_REQUIRE(pthread_setschedparam(childid, 1, ¶m)); 421 PTHREAD_REQUIRE(pthread_getschedparam(childid, &policy, ¶m)); 422 printf("low protect = %d, prio = %d\n", _sched_protect(-2), 423 param.sched_priority); 424 ATF_REQUIRE_EQ(policy, 1); 425 printf("low prio = %d\n", param.sched_priority); 426 sleep(1); 427 long tmp = 0; 428 for (int i = 0; i < 20; i++) { 429 while (low_cnt < MAX_LOOP) { 430 tmp += (123456789 % 1234) * (987654321 % 54321); 431 low_cnt += 1; 432 } 433 low_cnt = 0; 434 sleep(1); 435 } 436 PTHREAD_REQUIRE(pthread_mutex_lock(&mutex6)); 437 if (start == 0) 438 start = 1; 439 PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex6)); 440 441 return 0; 442 } 443 444 ATF_TC(mutex6); 445 ATF_TC_HEAD(mutex6, tc) 446 { 447 atf_tc_set_md_var(tc, "descr", 448 "Checks scheduling for priority ceiling"); 449 atf_tc_set_md_var(tc, "require.user", "root"); 450 } 451 452 /* 453 * 1. main thread sets itself to be a realtime task and launched two tasks, 454 * one has higher priority and the other has lower priority. 455 * 2. each child thread(low and high priority thread) sets its scheduler and 456 * priority. 457 * 3. each child thread did several rounds of computation, after each round it 458 * sleep 1 second. 459 * 4. the child thread with low priority will call _sched_protect to increase 460 * its protect priority. 461 * 5. We verify the thread with low priority runs first. 462 * 463 * Why does it work? From the main thread, we launched the high 464 * priority thread first. This gives this thread the benefit of 465 * starting first. The low priority thread did not call _sched_protect(2). 466 * The high priority thread should finish the task first. After each 467 * round of computation, we call sleep, to put the task into the 468 * sleep queue, and wake up again after the timer expires. This 469 * gives the scheduler the chance to decide which task to run. So, 470 * the thread with real high priority will always block the thread 471 * with real low priority. 472 * 473 */ 474 ATF_TC_BODY(mutex6, tc) 475 { 476 struct sched_param param; 477 int res; 478 pthread_t high, low; 479 480 min_fifo_prio = sched_get_priority_min(SCHED_FIFO); 481 max_fifo_prio = sched_get_priority_max(SCHED_FIFO); 482 PTHREAD_REQUIRE(pthread_mutex_init(&mutex, NULL)); 483 printf("min_fifo_prio = %d, max_fifo_info = %d\n", min_fifo_prio, 484 max_fifo_prio); 485 486 param.sched_priority = min_fifo_prio; 487 res = sched_setscheduler(getpid(), SCHED_FIFO, ¶m); 488 printf("previous policy used = %d\n", res); 489 490 res = sched_getscheduler(getpid()); 491 ATF_REQUIRE_EQ(res, 1); 492 PTHREAD_REQUIRE(pthread_create(&high, NULL, high_prio, NULL)); 493 PTHREAD_REQUIRE(pthread_create(&low, NULL, low_prio, NULL)); 494 sleep(5); 495 PTHREAD_REQUIRE(pthread_join(low, NULL)); 496 PTHREAD_REQUIRE(pthread_join(high, NULL)); 497 498 ATF_REQUIRE_EQ(start, 1); 499 } 500 501 ATF_TC(mutexattr1); 502 ATF_TC_HEAD(mutexattr1, tc) 503 { 504 atf_tc_set_md_var(tc, "descr", "Checks mutexattr"); 505 } 506 507 ATF_TC_BODY(mutexattr1, tc) 508 { 509 pthread_mutexattr_t mattr; 510 int protocol, target; 511 512 PTHREAD_REQUIRE(pthread_mutexattr_init(&mattr)); 513 514 target = PTHREAD_PRIO_NONE; 515 PTHREAD_REQUIRE(pthread_mutexattr_setprotocol(&mattr, target)); 516 PTHREAD_REQUIRE(pthread_mutexattr_getprotocol(&mattr, &protocol)); 517 ATF_REQUIRE_EQ(protocol, target); 518 519 /* 520 target = PTHREAD_PRIO_INHERIT; 521 PTHREAD_REQUIRE(pthread_mutexattr_setprotocol(&mattr, target)); 522 PTHREAD_REQUIRE(pthread_mutexattr_getprotocol(&mattr, &protocol)); 523 ATF_REQUIRE_EQ(protocol, target); 524 */ 525 526 target = PTHREAD_PRIO_PROTECT; 527 PTHREAD_REQUIRE(pthread_mutexattr_setprotocol(&mattr, target)); 528 PTHREAD_REQUIRE(pthread_mutexattr_getprotocol(&mattr, &protocol)); 529 ATF_REQUIRE_EQ(protocol, target); 530 } 531 532 ATF_TC(mutexattr2); 533 ATF_TC_HEAD(mutexattr2, tc) 534 { 535 atf_tc_set_md_var(tc, "descr", "Checks mutexattr"); 536 } 537 538 ATF_TC_BODY(mutexattr2, tc) 539 { 540 pthread_mutexattr_t mattr; 541 542 PTHREAD_REQUIRE(pthread_mutexattr_init(&mattr)); 543 int max_prio = sched_get_priority_max(SCHED_FIFO); 544 int min_prio = sched_get_priority_min(SCHED_FIFO); 545 for (int i = min_prio; i <= max_prio; i++) { 546 int prioceiling; 547 PTHREAD_REQUIRE(pthread_mutexattr_setprioceiling(&mattr, i)); 548 PTHREAD_REQUIRE(pthread_mutexattr_getprioceiling(&mattr, 549 &prioceiling)); 550 ATF_REQUIRE_EQ(i, prioceiling); 551 } 552 } 553 554 ATF_TP_ADD_TCS(tp) 555 { 556 ATF_TP_ADD_TC(tp, mutex1); 557 ATF_TP_ADD_TC(tp, mutex2); 558 ATF_TP_ADD_TC(tp, mutex3); 559 ATF_TP_ADD_TC(tp, mutex4); 560 ATF_TP_ADD_TC(tp, mutex5); 561 ATF_TP_ADD_TC(tp, mutex6); 562 ATF_TP_ADD_TC(tp, mutexattr1); 563 ATF_TP_ADD_TC(tp, mutexattr2); 564 565 return atf_no_error(); 566 } 567
Indexes created Tue Sep 23 01:09:51 GMT 2025