One-time execution

One-time execution. More...

Data Structures
union	globus_thread_once_t
	Thread once structure. More...

Macros
#define	GLOBUS_THREAD_ONCE_INIT   { .none = 0 }
	Thread once initializer value.

Functions
int	globus_thread_once (globus_thread_once_t *once, void(*init_routine)(void))
	Execute a function one time. More...

Detailed Description

One-time execution.

The globus_thread_once_t provides a way for applications and libraries to execute some code exactly one time, independent of the number of threads which attempt to execute it. To use this, statically initialize a globus_thread_once_t control with the value GLOBUS_THREAD_ONCE_INIT, and pass a pointer to a function to execute once, along with the control, to globus_thread_once().

Function Documentation

globus_thread_once()

int globus_thread_once	(	globus_thread_once_t *	once,
		void(*)(void)	init_routine
	)

Execute a function one time.

The globus_thread_once() function will execute the function pointed to by its init_routine parameter one time for each unique globus_thread_once_t object passed to it, independent of the number of threads calling it. The once value must be a static value initialized to GLOBUS_THREAD_ONCE_INIT.

Parameters

once	A pointer to the value used to govern whether the function passed via the init_routine parameter has executed.
init_routine	Function to execute one time. It is called with no parameters.

Returns

On success, globus_thread_once() guarantees that the function pointed to by init_routine has run, and that subsequent calls to globus_thread_once() with the same value of once will not execute that function, and returns GLOBUS_SUCCESS. If an error occurs, globus_thread_once() returns an implementation-specific non-zero error value.