pthread_tryjoin_np

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

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

SYNOPSIS
       #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
       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  ter-
       minates,  the  call returns an error.  The abstime argument is a struc-
       ture 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
       On  success,  these  functions return 0; on error, they return an error
       number.

ERRORS
       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 errors:

       ETIMEDOUT
              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
       These functions first appeared in glibc in version 2.3.3.

ATTRIBUTES
       For an  explanation  of  the  terms  used  in  this  section,  see  at-
       tributes(7).

       +-----------------------+---------------+---------+
       |Interface              | Attribute     | Value   |
       +-----------------------+---------------+---------+
       |pthread_tryjoin_np(),  | Thread safety | MT-Safe |
       |pthread_timedjoin_np() |               |         |
       +-----------------------+---------------+---------+
CONFORMING TO
       These functions are nonstandard GNU extensions; hence the suffix  "_np"
       (nonportable) in the names.

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

COLOPHON
       This  page  is  part of release 5.05 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
       https://www.kernel.org/doc/man-pages/.

Linux                             2017-09-15             PTHREAD_TRYJOIN_NP(3)