pthread_tryjoin_np(3) — Linux manual page


pthread_tryjoin_np(3)   Library Functions Manual   pthread_tryjoin_np(3)

NAME         top

       pthread_tryjoin_np, pthread_timedjoin_np - try to join with a
       terminated thread

LIBRARY         top

       POSIX threads library (libpthread, -lpthread)

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);

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

       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, measured against the
       CLOCK_REALTIME clock.  If the timeout expires before thread
       terminates, the call returns an error.  The abstime argument is a
       timespec(3) structure, specifying an absolute time measured since
       the Epoch (see time(2)).

RETURN VALUE         top

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

ERRORS         top

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

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

       pthread_timedjoin_np() can in addition fail with the following

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

              The call timed out before thread terminated.

       pthread_timedjoin_np() never returns the error EINTR.

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()              │               │         │

STANDARDS         top

       GNU; hence the suffix "_np" (nonportable) in the names.

HISTORY         top

       glibc 2.3.3.

BUGS         top

       The pthread_timedjoin_np() function measures time by internally
       calculating a relative sleep interval that is then measured
       against the CLOCK_MONOTONIC clock instead of the CLOCK_REALTIME
       clock.  Consequently, the timeout is unaffected by discontinuous
       changes to the CLOCK_REALTIME clock.

EXAMPLES         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), timespec(3),

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