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OpenSolaris 2009.06 - man page for pthread_once (opensolaris section 3c)

pthread_once(3C)					   Standard C Library Functions 					  pthread_once(3C)

pthread_once - initialize dynamic package
cc -mt [ flag... ] file... -lpthread [ library... ] #include <pthread.h> pthread_once_t once_control = PTHREAD_ONCE_INIT; int pthread_once(pthread_once_t *once_control, void (*init_routine)(void));
If any thread in a process with a once_control parameter makes a call to pthread_once(), the first call will summon the init_routine(), but subsequent calls will not. The once_control parameter determines whether the associated initialization routine has been called. The init_routine() is complete upon return of pthread_once(). pthread_once() is not a cancellation point; however, if the function init_routine() is a cancellation point and is canceled, the effect on once_control is the same as if pthread_once() had never been called. The constant PTHREAD_ONCE_INIT is defined in the <pthread.h> header. If once_control has automatic storage duration or is not initialized by PTHREAD_ONCE_INIT, the behavior of pthread_once() is undefined.
Upon successful completion, pthread_once() returns 0. Otherwise, an error number is returned to indicate the error.
EINVAL once_control or init_routine is NULL.
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
attributes(5), standards(5)
Solaris threads do not offer this functionality. SunOS 5.11 23 Mar 2005 pthread_once(3C)