2003-02-24 09:48:33 +01:00
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/* Test program for timedout read/write lock functions.
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Copyright (C) 2000, 2003 Free Software Foundation, Inc.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-02-10 00:18:22 +01:00
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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2003-02-24 09:48:33 +01:00
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#include <errno.h>
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#include <error.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/time.h>
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#define NWRITERS 15
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#define WRITETRIES 10
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#define NREADERS 15
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#define READTRIES 15
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#define TIMEOUT 1000000
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#define DELAY 1000000
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2003-02-27 09:01:47 +01:00
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#ifndef INIT
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# define INIT PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
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#endif
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static pthread_rwlock_t lock = INIT;
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2003-02-24 09:48:33 +01:00
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static void *
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writer_thread (void *nr)
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{
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struct timespec ts;
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struct timespec delay;
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int n;
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delay.tv_sec = 0;
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delay.tv_nsec = DELAY;
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for (n = 0; n < WRITETRIES; ++n)
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{
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int e;
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do
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{
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struct timeval tv;
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(void) gettimeofday (&tv, NULL);
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TIMEVAL_TO_TIMESPEC (&tv, &ts);
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ts.tv_nsec += 2 * TIMEOUT;
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2003-02-27 20:49:35 +01:00
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if (ts.tv_nsec >= 1000000000)
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{
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ts.tv_nsec -= 1000000000;
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++ts.tv_sec;
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}
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2003-02-24 09:48:33 +01:00
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printf ("writer thread %ld tries again\n", (long int) nr);
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e = pthread_rwlock_timedwrlock (&lock, &ts);
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if (e != 0 && e != ETIMEDOUT)
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{
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puts ("timedwrlock failed");
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exit (1);
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}
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}
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while (e == ETIMEDOUT);
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printf ("writer thread %ld succeeded\n", (long int) nr);
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nanosleep (&delay, NULL);
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if (pthread_rwlock_unlock (&lock) != 0)
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{
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puts ("unlock for writer failed");
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exit (1);
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}
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printf ("writer thread %ld released\n", (long int) nr);
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}
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return NULL;
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}
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static void *
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reader_thread (void *nr)
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{
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struct timespec ts;
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struct timespec delay;
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int n;
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delay.tv_sec = 0;
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delay.tv_nsec = DELAY;
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for (n = 0; n < READTRIES; ++n)
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{
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int e;
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do
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{
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struct timeval tv;
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(void) gettimeofday (&tv, NULL);
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TIMEVAL_TO_TIMESPEC (&tv, &ts);
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ts.tv_nsec += TIMEOUT;
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2003-02-27 20:49:35 +01:00
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if (ts.tv_nsec >= 1000000000)
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{
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ts.tv_nsec -= 1000000000;
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++ts.tv_sec;
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}
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2003-02-24 09:48:33 +01:00
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printf ("reader thread %ld tries again\n", (long int) nr);
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e = pthread_rwlock_timedrdlock (&lock, &ts);
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if (e != 0 && e != ETIMEDOUT)
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{
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puts ("timedrdlock failed");
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exit (1);
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}
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}
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while (e == ETIMEDOUT);
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printf ("reader thread %ld succeeded\n", (long int) nr);
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nanosleep (&delay, NULL);
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if (pthread_rwlock_unlock (&lock) != 0)
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{
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puts ("unlock for reader failed");
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exit (1);
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}
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printf ("reader thread %ld released\n", (long int) nr);
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}
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return NULL;
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}
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static int
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do_test (void)
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{
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pthread_t thwr[NWRITERS];
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pthread_t thrd[NREADERS];
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int n;
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void *res;
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/* Make standard error the same as standard output. */
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dup2 (1, 2);
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/* Make sure we see all message, even those on stdout. */
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setvbuf (stdout, NULL, _IONBF, 0);
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for (n = 0; n < NWRITERS; ++n)
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if (pthread_create (&thwr[n], NULL, writer_thread,
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(void *) (long int) n) != 0)
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{
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puts ("writer create failed");
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exit (1);
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}
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for (n = 0; n < NREADERS; ++n)
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if (pthread_create (&thrd[n], NULL, reader_thread,
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(void *) (long int) n) != 0)
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{
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puts ("reader create failed");
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exit (1);
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}
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/* Wait for all the threads. */
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for (n = 0; n < NWRITERS; ++n)
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if (pthread_join (thwr[n], &res) != 0)
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{
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puts ("writer join failed");
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exit (1);
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}
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for (n = 0; n < NREADERS; ++n)
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if (pthread_join (thrd[n], &res) != 0)
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{
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puts ("reader join failed");
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exit (1);
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}
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return 0;
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}
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#undef TIMEOUT
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#define TIMEOUT 30
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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