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.
Revision 0:0714ae633eab, committed 2014-04-10
- Comitter:
- Tomo2k
- Date:
- Thu Apr 10 21:59:11 2014 +0000
- Child:
- 1:1a8b1de53954
- Commit message:
- Simple mutex locker
Changed in this revision
| mutexlocker.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mutexlocker.h Thu Apr 10 21:59:11 2014 +0000
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "rtos.h"
+
+class MutexLocker
+{
+public:
+ MutexLocker(Mutex &mutex) :
+ m_mutex(&mutex) {
+ m_mutex->lock();
+ }
+ ~MutexLocker() {
+ m_mutex->unlock();
+ }
+private:
+ Mutex *m_mutex;
+};