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pthread_setcancelstate(3) Library Functions Manual pthread_setcancelstate(3) NAME pthread_setcancelstate - Sets the calling thread's cancelability state. LIBRARY DECthreads POSIX 1003.1c Library (libpthread.so) SYNOPSIS #include <pthread.h> int pthread_setcancelstate( int state, int *oldstate); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: IEEE Std 1003.1c-1995, POSIX System Application Program Interface PARAMETERS State of general cancelability to set for the calling thread. The fol- lowing are valid cancel state values: PTHREAD_CANCEL_ENABLE PTHREAD_CANCEL_DISABLE Previous cancelability state for the calling thread. DESCRIPTION This routine sets the current thread's cancelability state and returns the calling thread's previous cancelability state in oldstate. When cancelability state is set to PTHREAD_CANCEL_DISABLE, a cancela- tion request cannot be delivered to the thread, even if a cancelable routine is called or asynchronous cancelability type is enabled. When a thread is created, the default cancelability state is PTHREAD_CANCEL_ENABLE. Possible Problems When Disabling Cancelability The most important use of thread cancelation is to ensure that indefi- nite wait operations are terminated. For example, a thread that waits on some network connection, which can possibly take days to respond (or might never respond), should be made cancelable. When a thread's cancelability is disabled, no routine in that thread is cancelable. As a result, the user is unable to cancel the operation performed by that thread. When disabling cancelability, be sure that no long waits can occur or that it is necessary for other reasons to defer cancelation requests around that particular region of code. RETURN VALUES On successful completion, this routine returns the calling thread's previous cancelability state in the location specified by the oldstate argument. If an error condition occurs, this routine returns an integer value in- dicating the type of error. Possible return values are as follows: Successful completion. The specified state is not PTHREAD_CANCEL_EN- ABLE or PTHREAD_CANCEL_DISABLE. ERRORS None RELATED INFORMATION Functions: pthread_cancel(3), pthread_setcanceltype(3), pthread_test- cancel(3) Manuals: Guide to DECthreads and Programmer's Guide delim off pthread_setcancelstate(3)