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PTHREAD_ONCE(3)  		   BSD Library Functions Manual 		    PTHREAD_ONCE(3) 

     pthread_once -- dynamic package initialization

     #include <pthread.h>

     pthread_once_t once_control = PTHREAD_ONCE_INIT;

     pthread_once(pthread_once_t *once_control, void (*init_routine)(void));

     The first call to pthread_once() by any thread in a process, with a given once_control, will
     call the init_routine() with no arguments.  Subsequent calls to pthread_once() with the same
     once_control will not call the init_routine().  On return from pthread_once(), it is guaran-
     teed that init_routine() has completed.  The once_control parameter is used to determine
     whether the associated initialization routine has been called.

     The function pthread_once() is not a cancellation point.  However, if init_routine() is a
     cancellation point and is cancelled, the effect on once_control is as if pthread_once() was
     never called.

     The constant PTHREAD_ONCE_INIT is defined by header <pthread.h>.

     The behavior of pthread_once() is undefined if once_control has automatic storage duration
     or is not initialized by PTHREAD_ONCE_INIT.

     If successful, the pthread_once() function will return zero.  Otherwise, an error number
     will be returned to indicate the error.


     pthread_once() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD					  April 4, 1996 				      BSD
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