globus_thread_once man page

globus_thread_once — One-time execution

Data Structures

union globus_thread_once_t
Thread once structure.


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


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

Detailed Description

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

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.


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.


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.


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Sat Nov 5 2016 Version 16.8 globus_common