pthread_test.cpp revision 877ec6d90418ff1d6597147d355a2229fdffae7e
1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <gtest/gtest.h> 18 19#include <errno.h> 20#include <inttypes.h> 21#include <limits.h> 22#include <pthread.h> 23#include <sys/mman.h> 24#include <unistd.h> 25 26TEST(pthread, pthread_key_create) { 27 pthread_key_t key; 28 ASSERT_EQ(0, pthread_key_create(&key, NULL)); 29 ASSERT_EQ(0, pthread_key_delete(key)); 30 // Can't delete a key that's already been deleted. 31 ASSERT_EQ(EINVAL, pthread_key_delete(key)); 32} 33 34#if !defined(__GLIBC__) // glibc uses keys internally that its sysconf value doesn't account for. 35TEST(pthread, pthread_key_create_lots) { 36 // We can allocate _SC_THREAD_KEYS_MAX keys. 37 std::vector<pthread_key_t> keys; 38 for (int i = 0; i < sysconf(_SC_THREAD_KEYS_MAX); ++i) { 39 pthread_key_t key; 40 // If this fails, it's likely that GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT is wrong. 41 ASSERT_EQ(0, pthread_key_create(&key, NULL)) << i << " of " << sysconf(_SC_THREAD_KEYS_MAX); 42 keys.push_back(key); 43 } 44 45 // ...and that really is the maximum. 46 pthread_key_t key; 47 ASSERT_EQ(EAGAIN, pthread_key_create(&key, NULL)); 48 49 // (Don't leak all those keys!) 50 for (size_t i = 0; i < keys.size(); ++i) { 51 ASSERT_EQ(0, pthread_key_delete(keys[i])); 52 } 53} 54#endif 55 56static void* IdFn(void* arg) { 57 return arg; 58} 59 60static void* SleepFn(void* arg) { 61 sleep(reinterpret_cast<uintptr_t>(arg)); 62 return NULL; 63} 64 65static void* SpinFn(void* arg) { 66 volatile bool* b = reinterpret_cast<volatile bool*>(arg); 67 while (!*b) { 68 } 69 return NULL; 70} 71 72static void* JoinFn(void* arg) { 73 return reinterpret_cast<void*>(pthread_join(reinterpret_cast<pthread_t>(arg), NULL)); 74} 75 76static void AssertDetached(pthread_t t, bool is_detached) { 77 pthread_attr_t attr; 78 ASSERT_EQ(0, pthread_getattr_np(t, &attr)); 79 int detach_state; 80 ASSERT_EQ(0, pthread_attr_getdetachstate(&attr, &detach_state)); 81 pthread_attr_destroy(&attr); 82 ASSERT_EQ(is_detached, (detach_state == PTHREAD_CREATE_DETACHED)); 83} 84 85static void MakeDeadThread(pthread_t& t) { 86 ASSERT_EQ(0, pthread_create(&t, NULL, IdFn, NULL)); 87 void* result; 88 ASSERT_EQ(0, pthread_join(t, &result)); 89} 90 91TEST(pthread, pthread_create) { 92 void* expected_result = reinterpret_cast<void*>(123); 93 // Can we create a thread? 94 pthread_t t; 95 ASSERT_EQ(0, pthread_create(&t, NULL, IdFn, expected_result)); 96 // If we join, do we get the expected value back? 97 void* result; 98 ASSERT_EQ(0, pthread_join(t, &result)); 99 ASSERT_EQ(expected_result, result); 100} 101 102TEST(pthread, pthread_create_EAGAIN) { 103 pthread_attr_t attributes; 104 ASSERT_EQ(0, pthread_attr_init(&attributes)); 105 ASSERT_EQ(0, pthread_attr_setstacksize(&attributes, static_cast<size_t>(-1) & ~(getpagesize() - 1))); 106 107 pthread_t t; 108 ASSERT_EQ(EAGAIN, pthread_create(&t, &attributes, IdFn, NULL)); 109} 110 111TEST(pthread, pthread_no_join_after_detach) { 112 pthread_t t1; 113 ASSERT_EQ(0, pthread_create(&t1, NULL, SleepFn, reinterpret_cast<void*>(5))); 114 115 // After a pthread_detach... 116 ASSERT_EQ(0, pthread_detach(t1)); 117 AssertDetached(t1, true); 118 119 // ...pthread_join should fail. 120 void* result; 121 ASSERT_EQ(EINVAL, pthread_join(t1, &result)); 122} 123 124TEST(pthread, pthread_no_op_detach_after_join) { 125 bool done = false; 126 127 pthread_t t1; 128 ASSERT_EQ(0, pthread_create(&t1, NULL, SpinFn, &done)); 129 130 // If thread 2 is already waiting to join thread 1... 131 pthread_t t2; 132 ASSERT_EQ(0, pthread_create(&t2, NULL, JoinFn, reinterpret_cast<void*>(t1))); 133 134 sleep(1); // (Give t2 a chance to call pthread_join.) 135 136 // ...a call to pthread_detach on thread 1 will "succeed" (silently fail)... 137 ASSERT_EQ(0, pthread_detach(t1)); 138 AssertDetached(t1, false); 139 140 done = true; 141 142 // ...but t2's join on t1 still goes ahead (which we can tell because our join on t2 finishes). 143 void* join_result; 144 ASSERT_EQ(0, pthread_join(t2, &join_result)); 145 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(join_result)); 146} 147 148TEST(pthread, pthread_join_self) { 149 void* result; 150 ASSERT_EQ(EDEADLK, pthread_join(pthread_self(), &result)); 151} 152 153struct TestBug37410 { 154 pthread_t main_thread; 155 pthread_mutex_t mutex; 156 157 static void main() { 158 TestBug37410 data; 159 data.main_thread = pthread_self(); 160 ASSERT_EQ(0, pthread_mutex_init(&data.mutex, NULL)); 161 ASSERT_EQ(0, pthread_mutex_lock(&data.mutex)); 162 163 pthread_t t; 164 ASSERT_EQ(0, pthread_create(&t, NULL, TestBug37410::thread_fn, reinterpret_cast<void*>(&data))); 165 166 // Wait for the thread to be running... 167 ASSERT_EQ(0, pthread_mutex_lock(&data.mutex)); 168 ASSERT_EQ(0, pthread_mutex_unlock(&data.mutex)); 169 170 // ...and exit. 171 pthread_exit(NULL); 172 } 173 174 private: 175 static void* thread_fn(void* arg) { 176 TestBug37410* data = reinterpret_cast<TestBug37410*>(arg); 177 178 // Let the main thread know we're running. 179 pthread_mutex_unlock(&data->mutex); 180 181 // And wait for the main thread to exit. 182 pthread_join(data->main_thread, NULL); 183 184 return NULL; 185 } 186}; 187 188// Even though this isn't really a death test, we have to say "DeathTest" here so gtest knows to 189// run this test (which exits normally) in its own process. 190TEST(pthread_DeathTest, pthread_bug_37410) { 191 // http://code.google.com/p/android/issues/detail?id=37410 192 ::testing::FLAGS_gtest_death_test_style = "threadsafe"; 193 ASSERT_EXIT(TestBug37410::main(), ::testing::ExitedWithCode(0), ""); 194} 195 196static void* SignalHandlerFn(void* arg) { 197 sigset_t wait_set; 198 sigfillset(&wait_set); 199 return reinterpret_cast<void*>(sigwait(&wait_set, reinterpret_cast<int*>(arg))); 200} 201 202TEST(pthread, pthread_sigmask) { 203 // Check that SIGUSR1 isn't blocked. 204 sigset_t original_set; 205 sigemptyset(&original_set); 206 ASSERT_EQ(0, pthread_sigmask(SIG_BLOCK, NULL, &original_set)); 207 ASSERT_FALSE(sigismember(&original_set, SIGUSR1)); 208 209 // Block SIGUSR1. 210 sigset_t set; 211 sigemptyset(&set); 212 sigaddset(&set, SIGUSR1); 213 ASSERT_EQ(0, pthread_sigmask(SIG_BLOCK, &set, NULL)); 214 215 // Check that SIGUSR1 is blocked. 216 sigset_t final_set; 217 sigemptyset(&final_set); 218 ASSERT_EQ(0, pthread_sigmask(SIG_BLOCK, NULL, &final_set)); 219 ASSERT_TRUE(sigismember(&final_set, SIGUSR1)); 220 // ...and that sigprocmask agrees with pthread_sigmask. 221 sigemptyset(&final_set); 222 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, NULL, &final_set)); 223 ASSERT_TRUE(sigismember(&final_set, SIGUSR1)); 224 225 // Spawn a thread that calls sigwait and tells us what it received. 226 pthread_t signal_thread; 227 int received_signal = -1; 228 ASSERT_EQ(0, pthread_create(&signal_thread, NULL, SignalHandlerFn, &received_signal)); 229 230 // Send that thread SIGUSR1. 231 pthread_kill(signal_thread, SIGUSR1); 232 233 // See what it got. 234 void* join_result; 235 ASSERT_EQ(0, pthread_join(signal_thread, &join_result)); 236 ASSERT_EQ(SIGUSR1, received_signal); 237 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(join_result)); 238 239 // Restore the original signal mask. 240 ASSERT_EQ(0, pthread_sigmask(SIG_SETMASK, &original_set, NULL)); 241} 242 243#if __BIONIC__ 244extern "C" pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg); 245TEST(pthread, __bionic_clone) { 246 // Check that our hand-written clone assembler sets errno correctly on failure. 247 uintptr_t fake_child_stack[16]; 248 errno = 0; 249 ASSERT_EQ(-1, __bionic_clone(CLONE_THREAD, &fake_child_stack[0], NULL, NULL, NULL, NULL, NULL)); 250 ASSERT_EQ(EINVAL, errno); 251} 252#endif 253 254#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise. 255TEST(pthread, pthread_setname_np__too_long) { 256 ASSERT_EQ(ERANGE, pthread_setname_np(pthread_self(), "this name is far too long for linux")); 257} 258#endif 259 260#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise. 261TEST(pthread, pthread_setname_np__self) { 262 ASSERT_EQ(0, pthread_setname_np(pthread_self(), "short 1")); 263} 264#endif 265 266#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise. 267TEST(pthread, pthread_setname_np__other) { 268 // Emulator kernels don't currently support setting the name of other threads. 269 char* filename = NULL; 270 asprintf(&filename, "/proc/self/task/%d/comm", gettid()); 271 struct stat sb; 272 bool has_comm = (stat(filename, &sb) != -1); 273 free(filename); 274 275 if (has_comm) { 276 pthread_t t1; 277 ASSERT_EQ(0, pthread_create(&t1, NULL, SleepFn, reinterpret_cast<void*>(5))); 278 ASSERT_EQ(0, pthread_setname_np(t1, "short 2")); 279 } else { 280 fprintf(stderr, "skipping test: this kernel doesn't have /proc/self/task/tid/comm files!\n"); 281 } 282} 283#endif 284 285#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise. 286TEST(pthread, pthread_setname_np__no_such_thread) { 287 pthread_t dead_thread; 288 MakeDeadThread(dead_thread); 289 290 // Call pthread_setname_np after thread has already exited. 291 ASSERT_EQ(ESRCH, pthread_setname_np(dead_thread, "short 3")); 292} 293#endif 294 295TEST(pthread, pthread_kill__0) { 296 // Signal 0 just tests that the thread exists, so it's safe to call on ourselves. 297 ASSERT_EQ(0, pthread_kill(pthread_self(), 0)); 298} 299 300TEST(pthread, pthread_kill__invalid_signal) { 301 ASSERT_EQ(EINVAL, pthread_kill(pthread_self(), -1)); 302} 303 304static void pthread_kill__in_signal_handler_helper(int signal_number) { 305 static int count = 0; 306 ASSERT_EQ(SIGALRM, signal_number); 307 if (++count == 1) { 308 // Can we call pthread_kill from a signal handler? 309 ASSERT_EQ(0, pthread_kill(pthread_self(), SIGALRM)); 310 } 311} 312 313TEST(pthread, pthread_kill__in_signal_handler) { 314 struct sigaction action; 315 struct sigaction original_action; 316 sigemptyset(&action.sa_mask); 317 action.sa_flags = 0; 318 action.sa_handler = pthread_kill__in_signal_handler_helper; 319 ASSERT_EQ(0, sigaction(SIGALRM, &action, &original_action)); 320 ASSERT_EQ(0, pthread_kill(pthread_self(), SIGALRM)); 321 ASSERT_EQ(0, sigaction(SIGALRM, &original_action, NULL)); 322} 323 324TEST(pthread, pthread_detach__no_such_thread) { 325 pthread_t dead_thread; 326 MakeDeadThread(dead_thread); 327 328 ASSERT_EQ(ESRCH, pthread_detach(dead_thread)); 329} 330 331TEST(pthread, pthread_getcpuclockid__clock_gettime) { 332 pthread_t t; 333 ASSERT_EQ(0, pthread_create(&t, NULL, SleepFn, reinterpret_cast<void*>(5))); 334 335 clockid_t c; 336 ASSERT_EQ(0, pthread_getcpuclockid(t, &c)); 337 timespec ts; 338 ASSERT_EQ(0, clock_gettime(c, &ts)); 339} 340 341TEST(pthread, pthread_getcpuclockid__no_such_thread) { 342 pthread_t dead_thread; 343 MakeDeadThread(dead_thread); 344 345 clockid_t c; 346 ASSERT_EQ(ESRCH, pthread_getcpuclockid(dead_thread, &c)); 347} 348 349TEST(pthread, pthread_getschedparam__no_such_thread) { 350 pthread_t dead_thread; 351 MakeDeadThread(dead_thread); 352 353 int policy; 354 sched_param param; 355 ASSERT_EQ(ESRCH, pthread_getschedparam(dead_thread, &policy, ¶m)); 356} 357 358TEST(pthread, pthread_setschedparam__no_such_thread) { 359 pthread_t dead_thread; 360 MakeDeadThread(dead_thread); 361 362 int policy = 0; 363 sched_param param; 364 ASSERT_EQ(ESRCH, pthread_setschedparam(dead_thread, policy, ¶m)); 365} 366 367TEST(pthread, pthread_join__no_such_thread) { 368 pthread_t dead_thread; 369 MakeDeadThread(dead_thread); 370 371 void* result; 372 ASSERT_EQ(ESRCH, pthread_join(dead_thread, &result)); 373} 374 375TEST(pthread, pthread_kill__no_such_thread) { 376 pthread_t dead_thread; 377 MakeDeadThread(dead_thread); 378 379 ASSERT_EQ(ESRCH, pthread_kill(dead_thread, 0)); 380} 381 382TEST(pthread, pthread_join__multijoin) { 383 bool done = false; 384 385 pthread_t t1; 386 ASSERT_EQ(0, pthread_create(&t1, NULL, SpinFn, &done)); 387 388 pthread_t t2; 389 ASSERT_EQ(0, pthread_create(&t2, NULL, JoinFn, reinterpret_cast<void*>(t1))); 390 391 sleep(1); // (Give t2 a chance to call pthread_join.) 392 393 // Multiple joins to the same thread should fail. 394 ASSERT_EQ(EINVAL, pthread_join(t1, NULL)); 395 396 done = true; 397 398 // ...but t2's join on t1 still goes ahead (which we can tell because our join on t2 finishes). 399 void* join_result; 400 ASSERT_EQ(0, pthread_join(t2, &join_result)); 401 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(join_result)); 402} 403 404TEST(pthread, pthread_join__race) { 405 // http://b/11693195 --- pthread_join could return before the thread had actually exited. 406 // If the joiner unmapped the thread's stack, that could lead to SIGSEGV in the thread. 407 for (size_t i = 0; i < 1024; ++i) { 408 size_t stack_size = 64*1024; 409 void* stack = mmap(NULL, stack_size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); 410 411 pthread_attr_t a; 412 pthread_attr_init(&a); 413 pthread_attr_setstack(&a, stack, stack_size); 414 415 pthread_t t; 416 ASSERT_EQ(0, pthread_create(&t, &a, IdFn, NULL)); 417 ASSERT_EQ(0, pthread_join(t, NULL)); 418 ASSERT_EQ(0, munmap(stack, stack_size)); 419 } 420} 421 422static void* GetActualGuardSizeFn(void* arg) { 423 pthread_attr_t attributes; 424 pthread_getattr_np(pthread_self(), &attributes); 425 pthread_attr_getguardsize(&attributes, reinterpret_cast<size_t*>(arg)); 426 return NULL; 427} 428 429static size_t GetActualGuardSize(const pthread_attr_t& attributes) { 430 size_t result; 431 pthread_t t; 432 pthread_create(&t, &attributes, GetActualGuardSizeFn, &result); 433 void* join_result; 434 pthread_join(t, &join_result); 435 return result; 436} 437 438static void* GetActualStackSizeFn(void* arg) { 439 pthread_attr_t attributes; 440 pthread_getattr_np(pthread_self(), &attributes); 441 pthread_attr_getstacksize(&attributes, reinterpret_cast<size_t*>(arg)); 442 return NULL; 443} 444 445static size_t GetActualStackSize(const pthread_attr_t& attributes) { 446 size_t result; 447 pthread_t t; 448 pthread_create(&t, &attributes, GetActualStackSizeFn, &result); 449 void* join_result; 450 pthread_join(t, &join_result); 451 return result; 452} 453 454TEST(pthread, pthread_attr_setguardsize) { 455 pthread_attr_t attributes; 456 ASSERT_EQ(0, pthread_attr_init(&attributes)); 457 458 // Get the default guard size. 459 size_t default_guard_size; 460 ASSERT_EQ(0, pthread_attr_getguardsize(&attributes, &default_guard_size)); 461 462 // No such thing as too small: will be rounded up to one page by pthread_create. 463 ASSERT_EQ(0, pthread_attr_setguardsize(&attributes, 128)); 464 size_t guard_size; 465 ASSERT_EQ(0, pthread_attr_getguardsize(&attributes, &guard_size)); 466 ASSERT_EQ(128U, guard_size); 467 ASSERT_EQ(4096U, GetActualGuardSize(attributes)); 468 469 // Large enough and a multiple of the page size. 470 ASSERT_EQ(0, pthread_attr_setguardsize(&attributes, 32*1024)); 471 ASSERT_EQ(0, pthread_attr_getguardsize(&attributes, &guard_size)); 472 ASSERT_EQ(32*1024U, guard_size); 473 474 // Large enough but not a multiple of the page size; will be rounded up by pthread_create. 475 ASSERT_EQ(0, pthread_attr_setguardsize(&attributes, 32*1024 + 1)); 476 ASSERT_EQ(0, pthread_attr_getguardsize(&attributes, &guard_size)); 477 ASSERT_EQ(32*1024U + 1, guard_size); 478} 479 480TEST(pthread, pthread_attr_setstacksize) { 481 pthread_attr_t attributes; 482 ASSERT_EQ(0, pthread_attr_init(&attributes)); 483 484 // Get the default stack size. 485 size_t default_stack_size; 486 ASSERT_EQ(0, pthread_attr_getstacksize(&attributes, &default_stack_size)); 487 488 // Too small. 489 ASSERT_EQ(EINVAL, pthread_attr_setstacksize(&attributes, 128)); 490 size_t stack_size; 491 ASSERT_EQ(0, pthread_attr_getstacksize(&attributes, &stack_size)); 492 ASSERT_EQ(default_stack_size, stack_size); 493 ASSERT_GE(GetActualStackSize(attributes), default_stack_size); 494 495 // Large enough and a multiple of the page size. 496 ASSERT_EQ(0, pthread_attr_setstacksize(&attributes, 32*1024)); 497 ASSERT_EQ(0, pthread_attr_getstacksize(&attributes, &stack_size)); 498 ASSERT_EQ(32*1024U, stack_size); 499 ASSERT_EQ(GetActualStackSize(attributes), 32*1024U); 500 501 // Large enough but not a multiple of the page size; will be rounded up by pthread_create. 502 ASSERT_EQ(0, pthread_attr_setstacksize(&attributes, 32*1024 + 1)); 503 ASSERT_EQ(0, pthread_attr_getstacksize(&attributes, &stack_size)); 504 ASSERT_EQ(32*1024U + 1, stack_size); 505#if __BIONIC__ 506 // Bionic rounds up, which is what POSIX allows. 507 ASSERT_EQ(GetActualStackSize(attributes), (32 + 4)*1024U); 508#else 509 // glibc rounds down, in violation of POSIX. They document this in their BUGS section. 510 ASSERT_EQ(GetActualStackSize(attributes), 32*1024U); 511#endif 512} 513 514TEST(pthread, pthread_rwlock_smoke) { 515 pthread_rwlock_t l; 516 ASSERT_EQ(0, pthread_rwlock_init(&l, NULL)); 517 518 ASSERT_EQ(0, pthread_rwlock_rdlock(&l)); 519 ASSERT_EQ(0, pthread_rwlock_unlock(&l)); 520 521 ASSERT_EQ(0, pthread_rwlock_wrlock(&l)); 522 ASSERT_EQ(0, pthread_rwlock_unlock(&l)); 523 524 ASSERT_EQ(0, pthread_rwlock_destroy(&l)); 525} 526 527static int gOnceFnCallCount = 0; 528static void OnceFn() { 529 ++gOnceFnCallCount; 530} 531 532TEST(pthread, pthread_once_smoke) { 533 pthread_once_t once_control = PTHREAD_ONCE_INIT; 534 ASSERT_EQ(0, pthread_once(&once_control, OnceFn)); 535 ASSERT_EQ(0, pthread_once(&once_control, OnceFn)); 536 ASSERT_EQ(1, gOnceFnCallCount); 537} 538 539static int gAtForkPrepareCalls = 0; 540static void AtForkPrepare1() { gAtForkPrepareCalls = (gAtForkPrepareCalls << 4) | 1; } 541static void AtForkPrepare2() { gAtForkPrepareCalls = (gAtForkPrepareCalls << 4) | 2; } 542static int gAtForkParentCalls = 0; 543static void AtForkParent1() { gAtForkParentCalls = (gAtForkParentCalls << 4) | 1; } 544static void AtForkParent2() { gAtForkParentCalls = (gAtForkParentCalls << 4) | 2; } 545static int gAtForkChildCalls = 0; 546static void AtForkChild1() { gAtForkChildCalls = (gAtForkChildCalls << 4) | 1; } 547static void AtForkChild2() { gAtForkChildCalls = (gAtForkChildCalls << 4) | 2; } 548 549TEST(pthread, pthread_atfork) { 550 ASSERT_EQ(0, pthread_atfork(AtForkPrepare1, AtForkParent1, AtForkChild1)); 551 ASSERT_EQ(0, pthread_atfork(AtForkPrepare2, AtForkParent2, AtForkChild2)); 552 553 int pid = fork(); 554 ASSERT_NE(-1, pid) << strerror(errno); 555 556 // Child and parent calls are made in the order they were registered. 557 if (pid == 0) { 558 ASSERT_EQ(0x12, gAtForkChildCalls); 559 _exit(0); 560 } 561 ASSERT_EQ(0x12, gAtForkParentCalls); 562 563 // Prepare calls are made in the reverse order. 564 ASSERT_EQ(0x21, gAtForkPrepareCalls); 565} 566 567TEST(pthread, pthread_attr_getscope) { 568 pthread_attr_t attr; 569 ASSERT_EQ(0, pthread_attr_init(&attr)); 570 571 int scope; 572 ASSERT_EQ(0, pthread_attr_getscope(&attr, &scope)); 573 ASSERT_EQ(PTHREAD_SCOPE_SYSTEM, scope); 574} 575