NAME¶

rtapi_mutex - Mutex-related functions

SYNTAX¶

#include <rtapi_mutex.h>

int rtapi_mutex_try(unsigned long *mutex);
int rtapi_mutex_get(unsigned long *mutex);
int rtapi_mutex_give(unsigned long *mutex);

ARGUMENTS¶

mutex

A pointer to the mutex.

DESCRIPTION¶

rtapi_mutex_try makes a non-blocking attempt to get the mutex. If the mutex is available, it returns 0, and the mutex is no longer available. Otherwise, it returns a nonzero value.

rtapi_mutex_get blocks until the mutex is available.

rtapi_mutex_give releases a mutex acquired by rtapi_mutex_try or rtapi_mutex_get.

REALTIME CONSIDERATIONS¶

rtapi_mutex_give and rtapi_mutex_try may be used from non-realtime, init/cleanup, and realtime code.

rtapi_mutex_get may not be used from realtime code.

RETURN VALUE¶

rtapi_mutex_try returns 0 for if the mutex was claimed, and nonzero otherwise.

rtapi_mutex_get and rtapi_mutex_gif have no return value.