05-30-2012
Quote:
Originally Posted by
Brandon9000
Thanks, but what do you mean by "read cancellation point?"
As in reading, reading which you do, not the computer. Specifically, reading about cancellation points on the link he posted.
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LEARN ABOUT OSF1
pthread_cancel
pthread_cancel(3) Library Functions Manual pthread_cancel(3)
NAME
pthread_cancel - Allows a thread to request a thread to terminate execution.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_cancel(
pthread_t thread);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
Thread that receives a cancelation request.
DESCRIPTION
This routine sends a cancelation request to the specified target thread. A cancelation request is a mechanism by which a calling thread
requests the target thread to terminate as quickly as possible. Issuing a cancelation request does not guarantee that the target thread
will receive or handle the request.
When the cancelation 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 terminated.
Note that cancelation 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 cancelation takes place, as follows: The target thread can delay can-
celation during critical operations by setting its cancelability state to PTHREAD_CANCEL_DISABLE. Because of communication delays, the
calling thread can only rely on the fact that a cancelation request will eventually become pending in the target thread (provided that the
target thread does not terminate beforehand). The calling thread has no guarantee that a pending cancelation request will be delivered
because delivery is controlled by the target thread.
When a cancelation request is delivered to a thread, termination processing is similar to that for pthread_exit(3). For more information
about thread termination, see the discussion of thread termination in pthread_create(3).
This routine is preferred in implementing an Ada abort statement and any other language- or software-defined construct for requesting
thread cancelation.
The results of this routine are unpredictable, if the value specified in thread refers to a thread that does not currently exist.
RETURN VALUES
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.
ERRORS
None
RELATED INFORMATION
Functions: pthread_cleanup_pop(3), pthread_cleanup_push(3), pthread_create(3), pthread_exit(3), pthread_join(3), pthread_setcancelstate(3),
pthread_setcanceltype(3), pthread_testcancel(3)
Manuals: Guide to DECthreads and Programmer's Guide
delim off
pthread_cancel(3)