pthread_tryjoin_np(3)
NAME
pthread_tryjoin_np, pthread_timedjoin_np - try to join with a terminated thread
SYNOPSIS
#define _GNU_SOURCE #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 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
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 error:
- ETIMEDOUT
- The call timed out before thread terminated.
- pthread_timedjoin_np() never returns the error EINTR.
VERSIONS
These functions first appeared in glibc in version 2.3.3.
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_join(3), pthread_exit(3), pthreads(7)
COLOPHON
- This page is part of release 3.25 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.