PTHREAD_JOIN(3) | Library Functions Manual | PTHREAD_JOIN(3)

# NAME

pthread_join — wait for thread termination

# LIBRARY

POSIX Threads Library (libpthread, -lpthread)

# SYNOPSIS

#include <pthread.h>

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

# 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.

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

# RETURN VALUES

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

# ERRORS

pthread_join() shall fail if:

[EINVAL]
  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.

pthread_join() may fail if:

[EDEADLK]
  A deadlock was detected or the value of thread specifies the calling thread.

# SEE ALSO

wait(2), pthread_create(3)

# STANDARDS

The function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).

July 9, 2010 | NetBSD 7.2