PTHREAD_TRYJOIN_NP(3)     Linux Programmer's Manual    PTHREAD_TRYJOIN_NP(3)

NAME         top

       pthread_tryjoin_np,  pthread_timedjoin_np - try to join with a termi‐
       nated thread

SYNOPSIS         top

       #define _GNU_SOURCE             /* See feature_test_macros(7) */
       #include <pthread.h>

       int pthread_tryjoin_np(pthread_t thread, void **retval);

       int pthread_timedjoin_np(pthread_t thread, void **retval,
                                const struct timespec *abstime);

       Compile and link with -pthread.

DESCRIPTION         top

       These functions operate in the same way as pthread_join(3), except
       for the differences described on this page.

       The pthread_tryjoin_np() function performs a nonblocking join with
       the thread thread, returning the exit status of the thread in
       *retval.  If thread has not yet terminated, then instead of blocking,
       as is done by pthread_join(3), the call returns an error.

       The pthread_timedjoin_np() function performs a join-with-timeout.  If
       thread has not yet terminated, then the call blocks until a maximum
       time, specified in abstime.  If the timeout expires before thread
       terminates, the call returns an error.  The abstime argument is a
       structure of the following form, specifying an absolute time measured
       since the Epoch (see time(2)):

           struct timespec {
               time_t tv_sec;     /* seconds */
               long   tv_nsec;    /* nanoseconds */

RETURN VALUE         top

       On success, these functions return 0; on error, they return an error

ERRORS         top

       These functions can fail with the same errors as pthread_join(3).
       pthread_tryjoin_np() can in addition fail with the following error:

       EBUSY  thread had not yet terminated at the time of the call.

       pthread_timedjoin_np() can in addition fail with the following

              The call timed out before thread terminated.

       EINVAL abstime value is invalid (tv_sec is less than 0 or tv_nsec is
              greater than 1e9).

       pthread_timedjoin_np() never returns the error EINTR.

VERSIONS         top

       These functions first appeared in glibc in version 2.3.3.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface              Attribute     Value   │
       │pthread_tryjoin_np(),  │ Thread safety │ MT-Safe │
       │pthread_timedjoin_np() │               │         │

CONFORMING TO         top

       These functions are nonstandard GNU extensions; hence the suffix
       "_np" (nonportable) in the names.

EXAMPLE         top

       The following code waits to join for up to 5 seconds:

           struct timespec ts;
           int s;


           if (clock_gettime(CLOCK_REALTIME, &ts) == -1) {
               /* Handle error */

           ts.tv_sec += 5;

           s = pthread_timedjoin_np(thread, NULL, &ts);
           if (s != 0) {
               /* Handle error */

SEE ALSO         top

       clock_gettime(2), pthread_exit(3), pthread_join(3), pthreads(7)

COLOPHON         top

       This page is part of release 4.13 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                            2017-09-15            PTHREAD_TRYJOIN_NP(3)

Pages that refer to this page: pthread_join(3)