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71 lines
2.2 KiB
Groff
71 lines
2.2 KiB
Groff
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.TH PTHREAD_JOIN 3 LinuxThreads
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.SH NAME
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pthread_join \- wait for termination of another thread
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.SH SYNOPSIS
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#include <pthread.h>
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int pthread_join(pthread_t th, void **thread_return);
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.SH DESCRIPTION
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!pthread_join! suspends the execution of the calling thread until the
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thread identified by |th| terminates, either by calling !pthread_exit!(3)
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or by being cancelled.
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If |thread_return| is not !NULL!, the return value of |th| is stored
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in the location pointed to by |thread_return|. The return value of
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|th| is either the argument it gave to !pthread_exit!(3), or
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!PTHREAD_CANCELED! if |th| was cancelled.
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The joined thread !th! must be in the joinable state: it must not have
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been detached using !pthread_detach!(3) or the
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!PTHREAD_CREATE_DETACHED! attribute to !pthread_create!(3).
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When a joinable thread terminates, its memory resources (thread
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descriptor and stack) are not deallocated until another thread
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performs !pthread_join! on it. Therefore, !pthread_join! must be
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called once for each joinable thread created to avoid memory leaks.
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At most one thread can wait for the termination of a given
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thread. Calling !pthread_join! on a thread |th| on which another
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thread is already waiting for termination returns an error.
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.SH CANCELLATION
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!pthread_join! is a cancellation point. If a thread is canceled while
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suspended in !pthread_join!, the thread execution resumes immediately
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and the cancellation is executed without waiting for the |th| thread
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to terminate. If cancellation occurs during !pthread_join!, the |th|
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thread remains not joined.
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.SH "RETURN VALUE"
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On success, the return value of |th| is stored in the location pointed
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to by |thread_return|, and 0 is returned. On error, a non-zero error
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code is returned.
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.SH ERRORS
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.TP
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!ESRCH!
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No thread could be found corresponding to that specified by |th|.
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.TP
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!EINVAL!
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The |th| thread has been detached.
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.TP
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!EINVAL!
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Another thread is already waiting on termination of |th|.
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.TP
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!EDEADLK!
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The |th| argument refers to the calling thread.
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.SH AUTHOR
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Xavier Leroy <Xavier.Leroy@inria.fr>
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.SH "SEE ALSO"
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!pthread_exit!(3),
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!pthread_detach!(3),
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!pthread_create!(3),
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!pthread_attr_setdetachstate!(3),
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!pthread_cleanup_push!(3),
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!pthread_key_create!(3).
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