pthread_tryjoin_np3

Usage

#define _GNU_SOURCE             /* See feature_test_macros(7) */
#include <pthread.h>

Library

POSIX threads library (libpthread, -lpthread)

Overview

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)).

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:

pthread_timedjoin_np() never returns the error EINTR.

Attributes

For an explanation of the terms used in this section, see attributes(7).

Examples

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 */
}