pthread_join(3)pthread_join(3)NAMEpthread_join - Causes the calling thread to wait for the termination of
the specified thread
void **value_ptr );
DECthreads POSIX 1003.1c Library (libpthread.so)
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
Thread whose termination is awaited by the calling routine. Return
value of the terminating thread (when that thread either calls
pthread_exit(3) or returns from its start routine).
This routine suspends execution of the calling thread until the speci‐
fied target thread thread terminates.
On return from a successful pthread_join(3) call with a non-NULL
value_ptr argument, the value passed to pthread_exit(3) is returned in
the location referenced by value_ptr, and the terminating thread is
If more than one thread attempts to join with the same thread, the
results are unpredictable.
A call to pthread_join(3) returns after the target thread terminates.
The pthread_join(3) routine is a deferred cancellation point: the tar‐
get thread will not be detached if the thread blocked in
pthread_join(3) is canceled.
If a thread calls this routine and specifies its own pthread_t, a dead‐
lock can result.
The pthread_join(3) (or pthread_detach(3)) routine should eventually be
called for every thread that is created with the detachstate attribute
of its thread attributes object set to PTHREAD_CREATE_JOINABLE, so that
storage associated with the thread can be reclaimed.
If an error condition occurs, this routine returns an integer value
indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by thread does not refer to
a joinable thread. The value specified by thread does not refer to an
existing thread ID. A deadlock was detected, or thread specifies the
Functions: pthread_cancel(3), pthread_create(3), pthread_detach(3),
Manuals: Guide to DECthreads and Programmer's Guide