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glibc/linuxthreads/Examples/ex9.c
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/* Tests for pthread_barrier_* functions. | |
Copyright (C) 2000, 2001 Free Software Foundation, Inc. | |
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>, 2000. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If not, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <errno.h> | |
#include <error.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <pthread.h> | |
#define NUM_THREADS 10 | |
#define NUM_ITERS 500 | |
static void *thread (void *) __attribute__ ((__noreturn__)); | |
static pthread_barrier_t barrier; | |
int | |
main (void) | |
{ | |
pthread_t th; | |
pthread_t thread_list[NUM_THREADS]; | |
int i; | |
if (pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1) != 0) | |
error (EXIT_FAILURE, 0, "cannot initialize barrier"); | |
for (i = 0; i < NUM_THREADS; i++) | |
{ | |
if (pthread_create (&thread_list[i], NULL, thread, NULL) != 0) | |
error (EXIT_FAILURE, 0, "cannot create thread"); | |
} | |
(void) thread (NULL); | |
for (i = 0; i < NUM_THREADS; i++) | |
{ | |
pthread_join(thread_list[i], NULL); | |
} | |
return 0; | |
} | |
static void * | |
thread (void *arg) | |
{ | |
int i; | |
pthread_t self = pthread_self (); | |
static pthread_t last_serial_thread; | |
static int linecount; /* protected by flockfile(stdout) */ | |
for (i = 0; i < NUM_ITERS; i++) | |
{ | |
switch (pthread_barrier_wait (&barrier)) | |
{ | |
case 0: | |
flockfile (stdout); | |
printf ("%04d: non-serial thread %lu\n", ++linecount, | |
(unsigned long) self); | |
funlockfile (stdout); | |
break; | |
case PTHREAD_BARRIER_SERIAL_THREAD: | |
flockfile (stdout); | |
printf ("%04d: serial thread %lu\n", ++linecount, | |
(unsigned long) self); | |
funlockfile (stdout); | |
last_serial_thread = self; | |
break; | |
default: | |
/* Huh? */ | |
error (EXIT_FAILURE, 0, "unexpected return value from barrier wait"); | |
} | |
} | |
if (pthread_equal (self, last_serial_thread)) | |
{ | |
flockfile (stdout); | |
printf ("%04d: last serial thread %lu terminating process\n", | |
++linecount, (unsigned long) self); | |
funlockfile (stdout); | |
return; | |
} | |
pthread_exit(NULL); | |
} |