pthread_cancel man page on DigitalUNIX

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pthread_cancel(3)					     pthread_cancel(3)

       pthread_cancel  - Allows a thread to request a thread to terminate exe‐

       #include <pthread.h>

       int pthread_cancel(
	       pthread_t thread );

       DECthreads POSIX 1003.1c Library (

       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

       Thread that receives a cancellation request.

       This  routine  sends  a	cancellation  request  to the specified target
       thread. A cancellation request is a mechanism by which a calling thread
       requests the target thread to terminate as quickly as possible. Issuing
       a cancellation request does not guarantee that the target  thread  will
       receive or handle the request.

       When  the  cancellation request is acted on, all active cleanup handler
       routines for the target thread are called. When the last	 cleanup  han‐
       dler  returns,  the thread-specific data destructor routines are called
       for each thread-specific data key with a destructor and for  which  the
       target  thread has a non-NULL value. Finally, the target thread is ter‐

       Note that cancellation of the target thread  runs  asynchronously  with
       respect	to the calling thread's returning from pthread_cancel(3).  The
       target thread's cancelability state and type determine when or  if  the
       cancellation  takes place, as follows: The target thread can delay can‐
       cellation during critical operations by setting its cancelability state
       to  PTHREAD_CANCEL_DISABLE.  Because of communication delays, the call‐
       ing thread can only rely on the fact that a cancellation	 request  will
       eventually  become pending in the target thread (provided that the tar‐
       get thread does not terminate beforehand).  The calling thread  has  no
       guarantee that a pending cancellation request will be delivered because
       delivery is controlled by the target thread.

       When a cancellation request is delivered to a thread, termination  pro‐
       cessing	is  similar  to that for pthread_exit(3). For more information
       about thread termination, see the discussion of thread  termination  in

       This  routine  is  preferred in implementing an Ada abort statement and
       any other language- or software-defined construct for requesting thread

       The  results  of this routine are unpredictable, if the value specified
       in thread refers to a thread that does not currently exist.

       If an error condition occurs, this routine  returns  an	integer	 value
       indicating  the	type  of error. Possible return values are as follows:
       Successful completion.  The specified thread is	invalid.   The	thread
       argument does not specify an existing thread.


       Functions:	pthread_cleanup_pop(3),	      pthread_cleanup_push(3),
       pthread_create(3), pthread_exit(3), pthread_join(3), pthread_setcancel‐
       state(3), pthread_setcanceltype(3), pthread_testcancel(3)

       Manuals: Guide to DECthreads and Programmer's Guide


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