155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
/* Test program for timedout read/write lock functions.
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Copyright (C) 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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#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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static pthread_rwlock_t lock = PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP;
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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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ts.tv_sec = 0;
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ts.tv_nsec = TIMEOUT;
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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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do
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{
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clock_gettime (CLOCK_REALTIME, &ts);
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ts.tv_nsec += 2 * TIMEOUT;
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printf ("writer thread %ld tries again\n", (long int) nr);
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}
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//while (pthread_rwlock_wrlock (&lock), 0);
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while (pthread_rwlock_timedwrlock (&lock, &ts) == 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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pthread_rwlock_unlock (&lock);
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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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do
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{
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clock_gettime (CLOCK_REALTIME, &ts);
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ts.tv_nsec += TIMEOUT;
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printf ("reader thread %ld tries again\n", (long int) nr);
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}
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//while (pthread_rwlock_rdlock (&lock), 0);
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while (pthread_rwlock_timedrdlock (&lock, &ts) == 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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pthread_rwlock_unlock (&lock);
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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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int
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main (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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{
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int err = pthread_create (&thwr[n], NULL, writer_thread,
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(void *) (long int) n);
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if (err != 0)
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error (EXIT_FAILURE, err, "cannot create writer thread");
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}
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for (n = 0; n < NREADERS; ++n)
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{
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int err = pthread_create (&thrd[n], NULL, reader_thread,
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(void *) (long int) n);
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if (err != 0)
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error (EXIT_FAILURE, err, "cannot create reader thread");
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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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pthread_join (thwr[n], &res);
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for (n = 0; n < NREADERS; ++n)
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pthread_join (thrd[n], &res);
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return 0;
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}
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