PTHREAD_TRYJOIN_NP
PTHREAD_TRYJOIN_NP
NAMESYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
CONFORMING TO
EXAMPLE
SEE ALSO
COLOPHON
NAME
pthread_tryjoin_np, pthread_timedjoin_np − try to join with a terminated 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 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_exit(3), pthread_join(3), pthreads(7)
COLOPHON
This page is part of release 3.69 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 http://www.kernel.org/doc/man−pages/.
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