pthread_join - Causes the calling thread to wait for the termination of the specified thread.
DECthreads POSIX 1003.1c Library (libpthread.so)
Interfaces documented on this reference page conform to industry standards 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).
This routine suspends execution of the calling thread until the specified 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 detached.
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 cancelation point: the target 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 deadlock 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 calling thread.
Functions: pthread_cancel(3), pthread_create(3), pthread_detach(3), pthread_exit(3)
Manuals: Guide to DECthreads and Programmer's Guide