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

       pthread_tryjoin_np, pthread_timedjoin_np - try to join with a terminated thread

       #define _GNU_SOURCE	       /* See feature_test_macros(7) */
       #include <pthread.h>

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

       int pthread_timedjoin_np(pthread_t thread, void **retval,
				const struct timespec *abstime);

       Compile and link with -pthread.

       These  functions  operate  in  the same way as pthread_join(3), except for the differences
       described on this page.

       The pthread_tryjoin_np() function performs a nonblocking  join  with  the  thread  thread,
       returning  the  exit  status  of the thread in *retval.	If thread has not yet terminated,
       then instead of blocking, as is done by pthread_join(3), the call returns an error.

       The pthread_timedjoin_np() function performs a join-with-timeout.  If thread has  not  yet
       terminated, then the call blocks until a maximum time, specified in abstime.  If the time-
       out expires before thread terminates, the call returns an error.  The abstime argument  is
       a  structure  of  the following form, specifying an absolute time measured since the Epoch
       (see time(2)):

	   struct timespec {
	       time_t tv_sec;	  /* seconds */
	       long   tv_nsec;	  /* nanoseconds */

       On success, these functions return 0; on error, they return an error number.

       These functions can fail with the same errors  as  pthread_join(3).   pthread_tryjoin_np()
       can in addition fail with the following error:

       EBUSY  thread had not yet terminated at the time of the call.

       pthread_timedjoin_np() can in addition fail with the following error:

	      The call timed out before thread terminated.

       pthread_timedjoin_np() never returns the error EINTR.

       These functions first appeared in glibc in version 2.3.3.

       These  functions  are  nonstandard GNU extensions; hence the suffix "_np" (nonportable) in
       the names.

       The following code waits to join for up to 5 seconds:

	   struct timespec ts;
	   int s;


	   if (clock_gettime(CLOCK_REALTIME, &ts) == -1) {
	    /* Handle error */

	   ts.tv_sec += 5;

	   s = pthread_timedjoin_np(thread, NULL, &ts);
	   if (s != 0) {
	       /* Handle error */

       clock_gettime(2), pthread_exit(3), pthread_join(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					    2010-09-10			    PTHREAD_TRYJOIN_NP(3)
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