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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | BUGS | EXAMPLES | SEE ALSO | COLOPHON |
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pthread_tryjoin_np(3) Library Functions Manual pthread_tryjoin_np(3)
pthread_tryjoin_np, pthread_timedjoin_np - try to join with a
terminated thread
POSIX threads library (libpthread, -lpthread)
#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);
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, 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)).
On success, these functions return 0; on error, they return an
error number.
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:
EINVAL abstime value is invalid (tv_sec is less than 0 or tv_nsec
is greater than 1e9).
ETIMEDOUT
The call timed out before thread terminated.
pthread_timedjoin_np() never returns the error EINTR.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ pthread_tryjoin_np(), │ Thread safety │ MT-Safe │
│ pthread_timedjoin_np() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
GNU; hence the suffix "_np" (nonportable) in the names.
glibc 2.3.3.
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.
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 */
}
clock_gettime(2), pthread_exit(3), pthread_join(3), timespec(3),
pthreads(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 pthread_tryjoin_np(3)
Pages that refer to this page: pthread_join(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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