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PTHREAD_JOIN(3) Library Functions Manual PTHREAD_JOIN(3)

pthread_joinwait for thread termination

#include <pthread.h>

pthread_join(pthread_t thread, void **value_ptr);

The () function suspends execution of the calling thread until the target thread terminates unless the target thread has already terminated.

On return from a successful () call with a non-NULL value_ptr argument, the value passed to () by the terminating thread is stored in the location referenced by value_ptr. When a pthread_join() returns successfully, the target thread has been terminated. The results of multiple simultaneous calls to pthread_join() specifying the same target thread are undefined. If the thread calling pthread_join() is cancelled, then the target thread is not detached.

A thread that has exited but remains unjoined counts against [_POSIX_THREAD_THREADS_MAX].

If successful, the pthread_join() function will return zero. Otherwise an error number will be returned to indicate the error.

pthread_join() will fail if:

The implementation has detected that the value specified by thread does not refer to a joinable thread.
No thread could be found corresponding to that specified by the given thread ID, thread.
A deadlock was detected or the value of thread specifies the calling thread.

wait(2), pthread_create(3)

pthread_join() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).

June 5, 2013 OpenBSD-current