Richard Thompson
Mutex Locker utility class to lock/unlock mbed RTOS mutexes. Create and pass a mutex, it locks the mutex then unlocks it when destroyed.
Dependents: SmartLight HelloThreadsYo
Mutex Locker
This utility class is most useful when you have an activity that needs to be protected by a mutex that has multiple return points.
You would normally do this:
Using standard mutex access
Mutex myMutex;
void do_some_stuff()
{
myMutex.lock();
/* Do Stuff */
if (condition) {
myMutex.unlock();
return 0;
}
/* Call other method */
int temp = other_method(); // Temp so can unlock after function returns
myMutex.unlock();
return temp;
}
However, it's very easy to miss one of the unlock points which would later freeze the application.
Debugging this kind of error can be very hard.
The same example using MutexLocker:
Using a MutexLocker
Mutex myMutex;
int do_some_stuff()
{
MutexLocker locker(myMutex);
/* Do Stuff */
if (condition) {
return 0;
}
/* Call other method */
return other_method();
/* Mutex unlocks itself here */
}
No matter where or how your method returns, the mutex will always be unlocked as the MutexLocker goes out of scope.