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thr_join(3c)
thr_join(3C) Standard C Library Functions thr_join(3C)
NAME
thr_join - wait for thread termination
SYNOPSIS
#include <thread.h>
int thr_join(thread_t thread, thread_t *departed, void **status);
DESCRIPTION
The thr_join() function suspends processing of the calling thread until
the target thread completes. The thread argument must be a member of
the current process and cannot be a detached thread. See thr_cre‐
ate(3C).
If two or more threads wait for the same thread to complete, all will
suspend processing until the thread has terminated, and then one thread
will return successfully and the others will return with an error of
ESRCH. The thr_join() function will not block processing of the calling
thread if the target thread has already terminated.
If a thr_join() call returns successfully with a non-null status argu‐
ment, the value passed to thr_exit(3C) by the terminating thread will
be placed in the location referenced by status.
If the target thread ID is 0, thr_join() finds and returns the status
of a terminated undetached thread in the process. If no such thread ex‐
ists, it suspends processing of the calling thread until a thread for
which no other thread is waiting enters that state, at which time it
returns successfully, or until all other threads in the process are ei‐
ther daemon threads or threads waiting in thr_join(), in which case it
returns EDEADLK. See NOTES.
If departed is not NULL, it points to a location that is set to the ID
of the terminated thread if thr_join() returns successfully.
RETURN VALUES
If successful, thr_join() returns 0. Otherwise, an error number is re‐
turned to indicate the error.
ERRORS
EDEADLK A joining deadlock would occur, such as when a thread at‐
tempts to wait for itself, or the calling thread is waiting
for any thread to exit and only daemon threads or waiting
threads exist in the process.
ESRCH No undetached thread could be found corresponding to the
given thread ID.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ MT-LevelMT-Safe
SEE ALSO
thr_create(3C), thr_exit(3C), wait(3C), attributes(7), standards(7)
NOTES
Using thr_join in the following syntax,
while (thr_join(0, NULL, NULL) == 0);
will wait for the termination of all non-daemon threads, excluding
threads that are themselves waiting in thr_join().
Oracle Solaris 11.4 15 May 2014 thr_join(3C)