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pthread_join()

Join thread

Synopsis:

#include <pthread.h>

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

Arguments:

thread

The target thread whose termination you're waiting for.

value_ptr

NULL, or a pointer to a location where the function can store the value passed to pthread_exit() by the target thread.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_join() function blocks the calling thread until the target thread thread terminates, unless thread has already terminated. If value_ptr is non-NULL and pthread_join() returns successfully, then the value passed to pthread_exit() by the target thread is placed in value_ptr. If the target thread has been canceled then value_ptr is set to PTHREAD_CANCELED.

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The non-POSIX pthread_timedjoin() function is similar to pthread_join(), except that an error is returned if the join doesn't occur before a given time.

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The target thread must be joinable. Multiple pthread_join(), pthread_timedjoin(), ThreadJoin(), and ThreadJoin_r() calls on the same target thread aren't allowed. When pthread_join() returns successfully, the target thread has been terminated.

Returns:

EOK

Success.

EBUSY

The thread thread is already being joined.

EDEADLK

The thread thread is the calling thread.

EFAULT

A fault occurred trying to access the buffers provided.

EINVAL

The thread thread isn't joinable.

ESRCH

The thread thread doesn't exist.

Classification:

POSIX 1003.1 THR

Safety:
Cancellation point	Yes
Interrupt handler	No
Signal handler	Yes
Thread	Yes

See also:

pthread_create(), pthread_detach(), pthread_exit(), pthread_timedjoin(), ThreadJoin(), ThreadJoin_r()

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