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PTHREAD_DETACH(P)	   POSIX Programmer's Manual	     PTHREAD_DETACH(P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       pthread_detach - detach a thread

SYNOPSIS
       #include <pthread.h>

       int pthread_detach(pthread_t thread);


DESCRIPTION
       The pthread_detach() function shall indicate to the implementation that
       storage	for the thread thread can be reclaimed when that thread termi-
       nates. If thread has not terminated, pthread_detach() shall  not	 cause
       it  to  terminate. The effect of multiple pthread_detach() calls on the
       same target thread is unspecified.

RETURN VALUE
       If the call succeeds, pthread_detach() shall return  0;	otherwise,  an
       error number shall be returned to indicate the error.

ERRORS
       The pthread_detach() function shall 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_detach()  function	shall  not  return  an	error  code of
       [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       The pthread_join() or pthread_detach() functions should	eventually  be
       called for every thread that is created so that storage associated with
       the thread may be reclaimed.

       It has been suggested that a "detach" function is  not  necessary;  the
       detachstate  thread  creation  attribute	 is sufficient, since a thread
       need never be dynamically detached. However, need arises	 in  at	 least
       two cases:

	1. In  a cancellation handler for a pthread_join() it is nearly essen-
	   tial to have a pthread_detach() function in	order  to  detach  the
	   thread on which pthread_join() was waiting. Without it, it would be
	   necessary to have the handler do another pthread_join() to  attempt
	   to  detach  the  thread,  which  would  both delay the cancellation
	   processing for an unbounded period and  introduce  a	 new  call  to
	   pthread_join(),  which  might itself need a cancellation handler. A
	   dynamic detach is nearly essential in this case.


	2. In order to detach the "initial thread" (as	may  be	 desirable  in
	   processes that set up server threads).


FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_join()  ,  the Base Definitions volume of IEEE Std 1003.1-2001,
       <pthread.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group		     2003		     PTHREAD_DETACH(P)
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