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

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 terminates. 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.  How-
       ever, need arises in at least two cases:

	1. In  a  cancellation	handler  for  a  pthread_join()  it is nearly essential 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	cancella-
	   tion  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 orig-
       inal 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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