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glibc/nptl/tst-rwlock9.c
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/* Test program for timedout read/write lock functions. | |
Copyright (C) 2000-2016 Free Software Foundation, Inc. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 2000. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public License as | |
published by the Free Software Foundation; either version 2.1 of the | |
License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If | |
not, see <http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <error.h> | |
#include <pthread.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <time.h> | |
#include <unistd.h> | |
#include <sys/time.h> | |
#define NWRITERS 15 | |
#define WRITETRIES 10 | |
#define NREADERS 15 | |
#define READTRIES 15 | |
#define TIMEOUT 1000000 | |
#define DELAY 1000000 | |
#ifndef INIT | |
# define INIT PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP | |
#endif | |
static pthread_rwlock_t lock = INIT; | |
static void * | |
writer_thread (void *nr) | |
{ | |
struct timespec ts; | |
struct timespec delay; | |
int n; | |
delay.tv_sec = 0; | |
delay.tv_nsec = DELAY; | |
for (n = 0; n < WRITETRIES; ++n) | |
{ | |
int e; | |
do | |
{ | |
struct timeval tv; | |
(void) gettimeofday (&tv, NULL); | |
TIMEVAL_TO_TIMESPEC (&tv, &ts); | |
ts.tv_nsec += 2 * TIMEOUT; | |
if (ts.tv_nsec >= 1000000000) | |
{ | |
ts.tv_nsec -= 1000000000; | |
++ts.tv_sec; | |
} | |
printf ("writer thread %ld tries again\n", (long int) nr); | |
e = pthread_rwlock_timedwrlock (&lock, &ts); | |
if (e != 0 && e != ETIMEDOUT) | |
{ | |
puts ("timedwrlock failed"); | |
exit (1); | |
} | |
} | |
while (e == ETIMEDOUT); | |
printf ("writer thread %ld succeeded\n", (long int) nr); | |
nanosleep (&delay, NULL); | |
if (pthread_rwlock_unlock (&lock) != 0) | |
{ | |
puts ("unlock for writer failed"); | |
exit (1); | |
} | |
printf ("writer thread %ld released\n", (long int) nr); | |
} | |
return NULL; | |
} | |
static void * | |
reader_thread (void *nr) | |
{ | |
struct timespec ts; | |
struct timespec delay; | |
int n; | |
delay.tv_sec = 0; | |
delay.tv_nsec = DELAY; | |
for (n = 0; n < READTRIES; ++n) | |
{ | |
int e; | |
do | |
{ | |
struct timeval tv; | |
(void) gettimeofday (&tv, NULL); | |
TIMEVAL_TO_TIMESPEC (&tv, &ts); | |
ts.tv_nsec += TIMEOUT; | |
if (ts.tv_nsec >= 1000000000) | |
{ | |
ts.tv_nsec -= 1000000000; | |
++ts.tv_sec; | |
} | |
printf ("reader thread %ld tries again\n", (long int) nr); | |
e = pthread_rwlock_timedrdlock (&lock, &ts); | |
if (e != 0 && e != ETIMEDOUT) | |
{ | |
puts ("timedrdlock failed"); | |
exit (1); | |
} | |
} | |
while (e == ETIMEDOUT); | |
printf ("reader thread %ld succeeded\n", (long int) nr); | |
nanosleep (&delay, NULL); | |
if (pthread_rwlock_unlock (&lock) != 0) | |
{ | |
puts ("unlock for reader failed"); | |
exit (1); | |
} | |
printf ("reader thread %ld released\n", (long int) nr); | |
} | |
return NULL; | |
} | |
static int | |
do_test (void) | |
{ | |
pthread_t thwr[NWRITERS]; | |
pthread_t thrd[NREADERS]; | |
int n; | |
void *res; | |
/* Make standard error the same as standard output. */ | |
dup2 (1, 2); | |
/* Make sure we see all message, even those on stdout. */ | |
setvbuf (stdout, NULL, _IONBF, 0); | |
for (n = 0; n < NWRITERS; ++n) | |
if (pthread_create (&thwr[n], NULL, writer_thread, | |
(void *) (long int) n) != 0) | |
{ | |
puts ("writer create failed"); | |
exit (1); | |
} | |
for (n = 0; n < NREADERS; ++n) | |
if (pthread_create (&thrd[n], NULL, reader_thread, | |
(void *) (long int) n) != 0) | |
{ | |
puts ("reader create failed"); | |
exit (1); | |
} | |
/* Wait for all the threads. */ | |
for (n = 0; n < NWRITERS; ++n) | |
if (pthread_join (thwr[n], &res) != 0) | |
{ | |
puts ("writer join failed"); | |
exit (1); | |
} | |
for (n = 0; n < NREADERS; ++n) | |
if (pthread_join (thrd[n], &res) != 0) | |
{ | |
puts ("reader join failed"); | |
exit (1); | |
} | |
return 0; | |
} | |
#undef TIMEOUT | |
#define TIMEOUT 30 | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |