derek.holloway
7502bf64a4
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55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* Compiler options:
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#progos: linux
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#cc: additional_flags=-pthread
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#output: Starting process a\naaaaaaaaStarting process b\nababbbbbbbbb
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The output will change depending on the exact syscall sequence per
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thread, so will change with glibc versions. Prepare to modify; use
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the latest glibc.
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This file is from glibc/linuxthreads, with the difference that the
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number is 10, not 10000. */
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/* Creates two threads, one printing 10000 "a"s, the other printing
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10000 "b"s.
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Illustrates: thread creation, thread joining. */
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "pthread.h"
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static void *
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process (void *arg)
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{
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int i;
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fprintf (stderr, "Starting process %s\n", (char *) arg);
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for (i = 0; i < 10; i++)
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{
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write (1, (char *) arg, 1);
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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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int retcode;
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pthread_t th_a, th_b;
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void *retval;
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retcode = pthread_create (&th_a, NULL, process, (void *) "a");
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if (retcode != 0)
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fprintf (stderr, "create a failed %d\n", retcode);
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retcode = pthread_create (&th_b, NULL, process, (void *) "b");
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if (retcode != 0)
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fprintf (stderr, "create b failed %d\n", retcode);
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retcode = pthread_join (th_a, &retval);
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if (retcode != 0)
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fprintf (stderr, "join a failed %d\n", retcode);
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retcode = pthread_join (th_b, &retval);
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if (retcode != 0)
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fprintf (stderr, "join b failed %d\n", retcode);
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return 0;
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}
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