Revision 6:2e463846b575, committed 2016-03-14

Comitter:

noutram

Date:

Mon Mar 14 16:30:25 2016 +0000

Parent:

5:31707531f715

Child:

7:cd015e83995a

Commit message:

Comparing a yielding wait and a spinning-wait

Changed in this revision

--- a/main.cpp	Wed Mar 09 17:55:53 2016 +0000
+++ b/main.cpp	Mon Mar 14 16:30:25 2016 +0000
@@ -23,67 +23,32 @@
 //Thread ID for the Main function (CMSIS API)
 osThreadId tidMain;
 
-//Thread sychronisation primatives
-Mutex lock1;
-Mutex lock2;
-unsigned long sw1Count = 0;
-unsigned long sw2Count = 0;
-
 void thread1( const void* arg ) 
 {
     pc.printf("Entering thread 1\n");
     while (true) {
         yellowLED = 1;
-        
-        //Start critical section
-        lock1.lock();
- 
-        sw1Count++;
-        printf("\nCount1 = %lu", sw1Count);
-        
-        Thread::wait(1); //1ms
-        
-        //End critical section
-        lock1.unlock();
-                
-        if (SW1 == 1) {
-            lock2.lock();
-            sw2Count--;
-            lock2.unlock();   
-        }
-        
+        Thread::wait(DELAY);   
         yellowLED = 0;
-        Thread::wait(DELAY);       
+        Thread::wait(DELAY);               
     }
 }
 
+//This thread has higher priority
 void thread2( const void* arg ) 
 {
     pc.printf("Entering thread 2\n");  
     while (true) {
         redLED = 1;
-        
-        //Start critical section
-        lock2.lock();
-        
-        sw2Count++;
-        printf("\nCount2 = %lu", sw2Count);
-        
-        Thread::wait(1);  //1ms
-        
-        //End critical section
-        lock2.unlock();
-        
-        if (SW2 == 1) { 
-            lock1.lock();
-            sw1Count--;
-            lock1.unlock();  
-        }  
-
+        if (SW1 == 1) {
+            //wait_ms(osWaitForever);
+            Thread::wait(osWaitForever); 
+        } else {
+            Thread::wait(DELAY);    
+        }
         redLED = 0;
-        Thread::wait(DELAY); 
-        
-    } 
+        Thread::wait(DELAY);               
+    }
 }
 
 
@@ -97,8 +62,9 @@
     tidMain = Thread::gettid();  
     
     //Threads
-    Thread t1(thread1);
-    Thread t2(thread2);
+    Thread t1(thread1, NULL, osPriorityNormal);
+    //Thread t2(thread2, NULL, osPriorityNormal);
+    Thread t2(thread2, NULL, osPriorityAboveNormal);
     
     pc.printf("Main Thread\n");
     while (true) {