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Diffstat (limited to '')
| -rw-r--r-- | gnulib-tests/test-pthread-cond.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/gnulib-tests/test-pthread-cond.c b/gnulib-tests/test-pthread-cond.c new file mode 100644 index 0000000..dee37af --- /dev/null +++ b/gnulib-tests/test-pthread-cond.c @@ -0,0 +1,238 @@ +/* Test of condition variables in multithreaded situations. + Copyright (C) 2008-2020 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#include <config.h> + +#if USE_ISOC_THREADS || USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS || USE_WINDOWS_THREADS + +/* Which tests to perform. + Uncomment some of these, to verify that all tests crash if no locking + is enabled. */ +#define DO_TEST_COND 1 +#define DO_TEST_TIMEDCOND 1 + +/* Whether to help the scheduler through explicit sched_yield(). + Uncomment this to see if the operating system has a fair scheduler. */ +#define EXPLICIT_YIELD 1 + +/* Whether to print debugging messages. */ +#define ENABLE_DEBUGGING 0 + +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/time.h> + +#if EXPLICIT_YIELD +# include <sched.h> +#endif + +#if HAVE_DECL_ALARM +# include <signal.h> +# include <unistd.h> +#endif + +#include "macros.h" + +#if ENABLE_DEBUGGING +# define dbgprintf printf +#else +# define dbgprintf if (0) printf +#endif + +#if EXPLICIT_YIELD +# define yield() sched_yield () +#else +# define yield() +#endif + + +/* + * Condition check + */ +static int cond_value = 0; +static pthread_cond_t condtest; +static pthread_mutex_t lockcond; + +static void * +pthread_cond_wait_routine (void *arg) +{ + ASSERT (pthread_mutex_lock (&lockcond) == 0); + while (!cond_value) + { + ASSERT (pthread_cond_wait (&condtest, &lockcond) == 0); + } + ASSERT (pthread_mutex_unlock (&lockcond) == 0); + + cond_value = 2; + + return NULL; +} + +static void +test_pthread_cond_wait () +{ + struct timespec remain; + pthread_t thread; + int ret; + + remain.tv_sec = 2; + remain.tv_nsec = 0; + + cond_value = 0; + + ASSERT (pthread_create (&thread, NULL, pthread_cond_wait_routine, NULL) == 0); + do + { + yield (); + ret = nanosleep (&remain, &remain); + ASSERT (ret >= -1); + } + while (ret == -1 && (remain.tv_sec != 0 || remain.tv_nsec != 0)); + + /* signal condition */ + ASSERT (pthread_mutex_lock (&lockcond) == 0); + cond_value = 1; + ASSERT (pthread_cond_signal (&condtest) == 0); + ASSERT (pthread_mutex_unlock (&lockcond) == 0); + + ASSERT (pthread_join (thread, NULL) == 0); + + if (cond_value != 2) + abort (); +} + + +/* + * Timed Condition check + */ +static int cond_timeout; + +static void +get_ts (struct timespec *ts) +{ + struct timeval now; + + gettimeofday (&now, NULL); + + ts->tv_sec = now.tv_sec + 1; + ts->tv_nsec = now.tv_usec * 1000; +} + +static void * +pthread_cond_timedwait_routine (void *arg) +{ + int ret; + struct timespec ts; + + ASSERT (pthread_mutex_lock (&lockcond) == 0); + while (!cond_value) + { + get_ts (&ts); + ret = pthread_cond_timedwait (&condtest, &lockcond, &ts); + if (ret == ETIMEDOUT) + cond_timeout = 1; + } + ASSERT (pthread_mutex_unlock (&lockcond) == 0); + + return NULL; +} + +static void +test_pthread_cond_timedwait (void) +{ + struct timespec remain; + pthread_t thread; + int ret; + + remain.tv_sec = 2; + remain.tv_nsec = 0; + + cond_value = cond_timeout = 0; + + ASSERT (pthread_create (&thread, NULL, pthread_cond_timedwait_routine, NULL) + == 0); + do + { + yield (); + ret = nanosleep (&remain, &remain); + ASSERT (ret >= -1); + } + while (ret == -1 && (remain.tv_sec != 0 || remain.tv_nsec != 0)); + + /* signal condition */ + ASSERT (pthread_mutex_lock (&lockcond) == 0); + cond_value = 1; + ASSERT (pthread_cond_signal (&condtest) == 0); + ASSERT (pthread_mutex_unlock (&lockcond) == 0); + + ASSERT (pthread_join (thread, NULL) == 0); + + if (!cond_timeout) + abort (); +} + +int +main () +{ +#if HAVE_DECL_ALARM + /* Declare failure if test takes too long, by using default abort + caused by SIGALRM. */ + int alarm_value = 600; + signal (SIGALRM, SIG_DFL); + alarm (alarm_value); +#endif + + ASSERT (pthread_cond_init (&condtest, NULL) == 0); + + { + pthread_mutexattr_t attr; + + ASSERT (pthread_mutexattr_init (&attr) == 0); + ASSERT (pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_NORMAL) == 0); + ASSERT (pthread_mutex_init (&lockcond, &attr) == 0); + ASSERT (pthread_mutexattr_destroy (&attr) == 0); + } + +#if DO_TEST_COND + printf ("Starting test_pthread_cond_wait ..."); fflush (stdout); + test_pthread_cond_wait (); + printf (" OK\n"); fflush (stdout); +#endif +#if DO_TEST_TIMEDCOND + printf ("Starting test_pthread_cond_timedwait ..."); fflush (stdout); + test_pthread_cond_timedwait (); + printf (" OK\n"); fflush (stdout); +#endif + + return 0; +} + +#else + +/* No multithreading available. */ + +#include <stdio.h> + +int +main () +{ + fputs ("Skipping test: multithreading not enabled\n", stderr); + return 77; +} + +#endif |