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thr_join(3c)

Standard C Library Functions                                      thr_join(3C)



NAME
       thr_join - wait for thread termination

SYNOPSIS
       #include <thread.h>

       int thr_join(thread_t thread, thread_t *departed, void **status);

DESCRIPTION
       The thr_join() function suspends processing of the calling thread until
       the target thread completes. The thread argument must be  a  member  of
       the  current  process  and  cannot  be  a detached thread. See thr_cre‐
       ate(3C).


       If two or more threads wait for the same thread to complete,  all  will
       suspend processing until the thread has terminated, and then one thread
       will return successfully and the others will return with  an  error  of
       ESRCH. The thr_join() function will not block processing of the calling
       thread if the target thread has already terminated.


       If a thr_join() call returns successfully with a non-null status  argu‐
       ment,  the  value passed to thr_exit(3C) by the terminating thread will
       be placed in the location referenced by status.


       If the target thread  ID is 0, thr_join() finds and returns the  status
       of  a  terminated  undetached  thread in the process. If no such thread
       exists, it suspends processing of the calling thread until a thread for
       which  no  other  thread is waiting enters that state, at which time it
       returns successfully, or until all other threads  in  the  process  are
       either  daemon  threads or threads waiting in thr_join(), in which case
       it returns EDEADLK. See NOTES.


       If departed is not NULL, it points to a location that is set to the  ID
       of the terminated thread if thr_join() returns successfully.

RETURN VALUES
       If  successful,  thr_join()  returns  0.  Otherwise, an error number is
       returned to indicate the error.

ERRORS
       EDEADLK    A joining deadlock  would  occur,  such  as  when  a  thread
                  attempts  to wait for itself, or the calling thread is wait‐
                  ing for any thread to exit and only daemon threads or  wait‐
                  ing threads exist in the process.


       ESRCH      No  undetached  thread  could  be found corresponding to the
                  given thread ID.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ MT-LevelMT-Safe


SEE ALSO
       thr_create(3C), thr_exit(3C), wait(3C), attributes(7), standards(7)

NOTES
       Using thr_join in the following syntax,

         while (thr_join(0, NULL, NULL) == 0);



       will  wait  for  the  termination  of all non-daemon threads, excluding
       threads that are themselves waiting in thr_join().



Oracle Solaris 11.4               15 May 2014                     thr_join(3C)
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