pthread_join function

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LEARN ABOUT FREEBSD

pthread_join

PTHREAD_JOIN(3) 					   BSD Library Functions Manual 					   PTHREAD_JOIN(3)

NAME

     pthread_join, pthread_timedjoin_np -- wait for thread termination

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_join(pthread_t thread, void **value_ptr);

     int
     pthread_timedjoin_np(pthread_t thread, void **value_ptr, const struct timespec *abstime);

DESCRIPTION

     The pthread_join() function suspends execution of the calling thread until 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() 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.

     The pthread_timedjoin_np() function is equivalent to the pthread_join() function except it will return ETIMEDOUT if target thread does not
     exit before specified absolute time passes.

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

RETURN VALUES

     If successful, the pthread_join() and pthread_timedjoin_np() functions will return zero.  Otherwise an error number will be returned to indi-
     cate the error.

ERRORS

     The pthread_join() and pthread_timedjoin_np() functions 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.

     [EOPNOTSUPP]	The implementation detected that another caller is already waiting on thread.

     Additionally, the pthread_timedjoin_np() function will fail if:

     [ETIMEDOUT]	The specified absolute time passed while pthread_timedjoin_np() waited for thread exit.

SEE ALSO

     wait(2), pthread_create(3)

STANDARDS

     The pthread_join() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').  The pthread_timedjoin_np() is a FreeBSD extension which first
     appeared in FreeBSD 6.1.

BSD
								 January 23, 2010							       BSD

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