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

NAME
       pthread_exit - thread termination

SYNOPSIS
       #include <pthread.h>

       void pthread_exit(void *value_ptr);

DESCRIPTION
       The  pthread_exit()  function  shall  terminate	the  calling  thread  and  make the value
       value_ptr available to any successful join with the terminating thread.	Any  cancellation
       cleanup	handlers  that have been pushed and not yet popped shall be popped in the reverse
       order that they were pushed and then executed.  After all  cancellation	cleanup  handlers
       have  been  executed,  if  the thread has any thread-specific data, appropriate destructor
       functions shall be called in an unspecified order. Thread termination does not release any
       application  visible  process  resources,  including, but not limited to, mutexes and file
       descriptors, nor does it perform any process-level cleanup  actions,  including,  but  not
       limited to, calling any atexit() routines that may exist.

       An  implicit  call  to pthread_exit() is made when a thread other than the thread in which
       main() was first invoked returns from the start routine that was used to  create  it.  The
       function's return value shall serve as the thread's exit status.

       The  behavior of pthread_exit() is undefined if called from a cancellation cleanup handler
       or destructor function that was invoked as a result of either an implicit or explicit call
       to pthread_exit().

       After  a  thread  has  terminated,  the	result of access to local (auto) variables of the
       thread is undefined. Thus, references to local variables of the exiting thread should  not
       be used for the pthread_exit() value_ptr parameter value.

       The process shall exit with an exit status of 0 after the last thread has been terminated.
       The behavior shall be as if the implementation called  exit()  with  a  zero  argument  at
       thread termination time.

RETURN VALUE
       The pthread_exit() function cannot return to its caller.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       The  normal  mechanism by which a thread terminates is to return from the routine that was
       specified in the pthread_create() call that started it. The pthread_exit()  function  pro-
       vides  the  capability for a thread to terminate without requiring a return from the start
       routine of that thread, thereby providing a function analogous to exit().

       Regardless of the method of thread termination, any  cancellation  cleanup  handlers  that
       have  been  pushed  and	not yet popped are executed, and the destructors for any existing
       thread-specific data are executed. This volume of IEEE Std 1003.1-2001 requires that  can-
       cellation  cleanup  handlers be popped and called in order. After all cancellation cleanup
       handlers have been executed, thread-specific data destructors are called, in  an  unspeci-
       fied order, for each item of thread-specific data that exists in the thread. This ordering
       is necessary because cancellation cleanup handlers may rely on thread-specific data.

       As the meaning of the status is determined by the application (except when the thread  has
       been  canceled, in which case it is PTHREAD_CANCELED), the implementation has no idea what
       an illegal status value is, which is why no address error checking is done.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exit()  ,  pthread_create()  ,  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_EXIT(P)
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