54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* Compiler options:
|
|
#progos: linux
|
|
#cc: additional_flags=-pthread
|
|
#output: Starting process a\naaaaaaaaStarting process b\nababbbbbbbbb
|
|
|
|
The output will change depending on the exact syscall sequence per
|
|
thread, so will change with glibc versions. Prepare to modify; use
|
|
the latest glibc.
|
|
|
|
This file is from glibc/linuxthreads, with the difference that the
|
|
number is 10, not 10000. */
|
|
|
|
/* Creates two threads, one printing 10000 "a"s, the other printing
|
|
10000 "b"s.
|
|
Illustrates: thread creation, thread joining. */
|
|
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include "pthread.h"
|
|
|
|
static void *
|
|
process (void *arg)
|
|
{
|
|
int i;
|
|
fprintf (stderr, "Starting process %s\n", (char *) arg);
|
|
for (i = 0; i < 10; i++)
|
|
{
|
|
write (1, (char *) arg, 1);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
int retcode;
|
|
pthread_t th_a, th_b;
|
|
void *retval;
|
|
|
|
retcode = pthread_create (&th_a, NULL, process, (void *) "a");
|
|
if (retcode != 0)
|
|
fprintf (stderr, "create a failed %d\n", retcode);
|
|
retcode = pthread_create (&th_b, NULL, process, (void *) "b");
|
|
if (retcode != 0)
|
|
fprintf (stderr, "create b failed %d\n", retcode);
|
|
retcode = pthread_join (th_a, &retval);
|
|
if (retcode != 0)
|
|
fprintf (stderr, "join a failed %d\n", retcode);
|
|
retcode = pthread_join (th_b, &retval);
|
|
if (retcode != 0)
|
|
fprintf (stderr, "join b failed %d\n", retcode);
|
|
return 0;
|
|
}
|