PTHREAD_JOIN(3) BSD Programmer's Manual PTHREAD_JOIN(3)
pthread_join - wait for thread termination
#include <pthread.h> int pthread_join(pthread_t thread, void **value_ptr);
The pthread_join() function suspends execution of the calling thread un- til the target thread terminates unless the target thread has already terminated. On return from a successful pthread_join() call with a non-NULL value_ptr argument, the value passed to pthread_exit() by the terminating thread is stored in the location referenced by value_ptr. When a pthread_join() re- turns 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: [EINVAL] The implementation has detected that the value specified by thread does not refer to a joinable thread. [ESRCH] No thread could be found corresponding to that specified by the given thread ID, thread. [EDEADLK] 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"). MirBSD #10-current April 4, 1996 1