This is threads/detached_attrib.c (Listing 29-2, page 628), an example from the book, The Linux Programming Interface.

The source code file is copyright 2022, Michael Kerrisk, and is licensed under the GNU General Public License, version 3.

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/* detached_attrib.c

   An example of the use of POSIX thread attributes (pthread_attr_t):
   creating a detached thread.
#include <pthread.h>
#include "tlpi_hdr.h"
static void *
threadFunc(void *x)
    return x;
main(int argc, char *argv[])
    pthread_t thr;
    pthread_attr_t attr;
    int s;

    s = pthread_attr_init(&attr);       /* Assigns default values */
    if (s != 0)
        errExitEN(s, "pthread_attr_init");

    s = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    if (s != 0)
        errExitEN(s, "pthread_attr_setdetachstate");

    s = pthread_create(&thr, &attr, threadFunc, (void *) 1);
    if (s != 0)
        errExitEN(s, "pthread_create");

    s = pthread_attr_destroy(&attr);    /* No longer needed */
    if (s != 0)
        errExitEN(s, "pthread_attr_destroy");

    s = pthread_join(thr, NULL);
    if (s != 0)
        errExitEN(s, "pthread_join failed as expected");



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