Unix/Linux Go Back    

Linux 2.6 - man page for pthread_join (linux section 3)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

PTHREAD_JOIN(3) 		    Linux Programmer's Manual			  PTHREAD_JOIN(3)

       pthread_join - join with a terminated thread

       #include <pthread.h>

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

       Compile and link with -pthread.

       The  pthread_join()  function  waits  for the thread specified by thread to terminate.  If
       that thread has already terminated, then pthread_join() returns immediately.   The  thread
       specified by thread must be joinable.

       If  retval  is  not  NULL, then pthread_join() copies the exit status of the target thread
       (i.e., the value that the target thread supplied to  pthread_exit(3))  into  the  location
       pointed to by *retval.  If the target thread was canceled, then PTHREAD_CANCELED is placed
       in *retval.

       If multiple threads simultaneously try to join with the same thread, the results are unde-
       fined.	If  the  thread  calling  pthread_join() is canceled, then the target thread will
       remain joinable (i.e., it will not be detached).

       On success, pthread_join() returns 0; on error, it returns an error number.

	      A deadlock was detected (e.g., two threads tried	to  join  with	each  other);  or
	      thread specifies the calling thread.

       EINVAL thread is not a joinable thread.

       EINVAL Another thread is already waiting to join with this thread.

       ESRCH  No thread with the ID thread could be found.


       After a successful call to pthread_join(), the caller is guaranteed that the target thread
       has terminated.

       Joining with a thread that has previously been joined results in undefined behavior.

       Failure to join with a thread that is joinable (i.e., one that is not detached),  produces
       a  "zombie  thread".   Avoid  doing  this,  since  each zombie thread consumes some system
       resources, and when enough zombie threads have accumulated, it will no longer be  possible
       to create new threads (or processes).

       There is no pthreads analog of waitpid(-1, &status, 0), that is, "join with any terminated
       thread".  If you believe you need this functionality, you probably need	to  rethink  your
       application design.

       All  of	the  threads in a process are peers: any thread can join with any other thread in
       the process.

       See pthread_create(3).

       pthread_cancel(3),      pthread_create(3),	pthread_detach(3),	 pthread_exit(3),
       pthread_tryjoin_np(3), pthreads(7)

       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

Linux					    2008-11-27				  PTHREAD_JOIN(3)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 04:57 AM.