University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task329

Demonstrates a race condition

Files at this revision

API Documentation at this revision

Revision 4:e1c35030b91a, committed 2019-09-18

Comitter:
noutram
Date:
Wed Sep 18 10:28:12 2019 +0000
Parent:
3:e5c2bfd464f7
Child:
5:5dcfbaa2e549
Commit message:
2019

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Wed Sep 18 10:17:32 2019 +0000
+++ b/main.cpp	Wed Sep 18 10:28:12 2019 +0000
@@ -5,7 +5,7 @@
 #define PRESSED  1
 
 #ifdef TARGET_NUCLEO_F429ZI
-//#define ONBOARD
+#define ONBOARD
 #endif
 
 #ifdef ONBOARD
@@ -29,6 +29,7 @@
     //RED MEANS THE COUNT UP FUNCTION IS IN ITS CRITICAL SECTION
     red_led = 1;
     for (unsigned int n=0; n<N; n++) {
+        CriticalSectionLock::enable();
         counter++; 
         counter++;
         counter++;
@@ -39,7 +40,7 @@
         counter++;
         counter++;
         counter++; 
- 
+        CriticalSectionLock::disable();
     }  
     red_led = 0; 
     
@@ -55,6 +56,7 @@
     //YELLOW MEANS THE COUNT DOWN FUNCTION IS IN ITS CRITICAL SECTION
     yellow_led = 1;
     for (unsigned int n=0; n<N; n++) {
+        CriticalSectionLock::enable();
         counter--;
         counter--;
         counter--;
@@ -64,7 +66,8 @@
         counter--;
         counter--;
         counter--;
-        counter--;   
+        counter--;  
+        CriticalSectionLock::disable(); 
     }
     yellow_led = 0;