Unix/Linux Go Back    


man page for pthread_once (all section 3)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


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

NAME
     pthread_once -- dynamic package initialization

SYNOPSIS
     #include <pthread.h>

     pthread_once_t once_control = PTHREAD_ONCE_INIT;

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

DESCRIPTION
     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.

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

ERRORS
     None.

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

BSD					  April 4, 1996 				      BSD
Unix & Linux Commands & Man Pages : ©2000 - 2017 Unix and Linux Forums


All times are GMT -4. The time now is 11:55 PM.