Sistemi operativi - Syscall pthread_join

Pthread_join

The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group

Name

pthread_join - wait for thread termination

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 made available 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 canceled, then the target thread will not be detached. It is unspecified whether a thread that has exited but remains unjoined counts against _POSIX_THREAD_THREADS_MAX.

Return Value

If successful, the pthread_join() function returns zero. Otherwise, an error number is returned to indicate the error.

Errors

The pthread_join() function 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.

The pthread_join() function may fail if:

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

The pthread_join() function will not return an error code of [EINTR].

Examples

None.