once.h File Reference

Dynamic package initialization. More...

#include <sys/cdefs.h>

Go to the source code of this file.

Data Structures
struct	kthread_once_t
	Object type backing kthread_once. More...

Macros
#define	KTHREAD_ONCE_INIT   { 1, 0 }
	Initializer for a kthread_once_t object. More...

Functions
int	kthread_once (kthread_once_t *once_control, void(*init_routine)(void))
	Run a function once. More...

Detailed Description

Dynamic package initialization.

This file provides definitions for an object that functions the same way as the pthread_once_t function does from the POSIX specification. This object type and functionality is generally used to make sure that a given initialization function is run once, and only once, no matter how many threads attempt to call it.

Author

Lawrence Sebald

Macro Definition Documentation

#define KTHREAD_ONCE_INIT   { 1, 0 }

Initializer for a kthread_once_t object.

Function Documentation

int kthread_once	(	kthread_once_t *	once_control,
		void(*)(void)	init_routine
	)

Run a function once.

This function, when used with a kthread_once_t object (that should be shared amongst all threads) will run the init_routine once, and set the once_control to make sure that the function will not be run again (as long as all threads attempt to call the init_routine through this function.

Parameters

once_control	The kthread_once_t object to run against.
init_routine	The function to call.

Return values

-1	On failure, and sets errno to one of the following: ENOMEM if out of memory, EPERM if called inside an interrupt, or EINTR if interrupted.
0	On success.