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PTHREAD_CANCEL(3) Library Functions Manual PTHREAD_CANCEL(3) NAME pthread_cancel -- cancel execution of a thread LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_cancel(pthread_t thread); DESCRIPTION The pthread_cancel() function requests that thread be canceled. The target thread's cancelability state and type determines whether and when the target thread reacts to the cancellation request. 1. The cancelability state of a thread is determined by the pthread_setcancelstate(3) function. The state can be either: o PTHREAD_CANCEL_ENABLE: the cancelability type determines when the actual cancellation occurs. This is the default. o PTHREAD_CANCEL_DISABLE: the request from pthread_cancel() remains queued until the cancellation is enabled by the thread. 2. The cancellation type of a thread is determined by the pthread_setcanceltype(3) function. The type can be either: o PTHREAD_CANCEL_DEFERRED: the cancellation will be delayed until the thread calls a function that is a cancellation point. This is the default. The available cancellation points are listed in pthread_setcanceltype(3). o PTHREAD_CANCEL_ASYNCHRONOUS: the thread can be canceled at any time. When the thread reacts to the cancellation request, the following occur: 1. The cancellation cleanup handlers for the thread are called; see pthread_cleanup_push(3). 2. When the last cancellation cleanup handler returns, the thread- specific data destructor functions will be called for the thread. 3. When the last destructor function returns, the thread will be terminated; see pthread_exit(3). The cancellation processing in the target thread runs asynchronously with respect to the calling thread returning from pthread_cancel(). A status of PTHREAD_CANCELED is made available to any threads joining with the target. The symbolic constant PTHREAD_CANCELED expands to a constant expression of type (void *), whose value matches no pointer to an object in memory nor the value NULL. RETURN VALUES If successful, the pthread_cancel() functions will return zero. Otherwise an error number will be returned to indicate the error. ERRORS The pthread_cancel() function may fail if: [ESRCH] No thread could be found corresponding to that specified by the given thread ID. SEE ALSO pthread_cleanup_pop(3), pthread_join(3), pthread_testcancel(3) STANDARDS The function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). NetBSD 7.1.2 July 9, 2010 NetBSD 7.1.2