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 user, 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.