Diff: main.cpp

Revision:

1:605f5624661e

Parent:

0:b908013d70cd

Child:

2:0cf7e435eeb8

--- a/main.cpp	Sat Jul 25 09:46:26 2020 +0000
+++ b/main.cpp	Sun Jul 26 10:59:21 2020 +0000
@@ -1,9 +1,8 @@
-/* 21_ MUTEX a Guard at door - Basic program  (All thread with same priority level)
+/* 21_ MUTEX a Guard at door - Basic program 
 MUTEX allow only one Thread / Function call inside CS, Mutex have ownership type locking mechanism.
 Procees /or Thread who locked block,only same process /or thread can unlock it.
 */
-//BUGS in MUTEX CLASS
-//NOTE : MUTEX ONLY PROTECT CS from processes which are belonging same priority level -MBED BUG
+
 
 //PROGRAM CREATED BY : JAYDEEP SHAH -- radheec@gmail.com
 //DATE : 25 JULY 20 ,VERSION 1.0
@@ -17,9 +16,9 @@
 
 //Create Two Thread 
 
-Thread t2;  //Create Thread with high priority
+Thread t2;  
 
-Thread t3; //Create Thread with low priority
+Thread t3; 
 
 
 //Here below section act as CS critical section
@@ -32,9 +31,12 @@
     
     printf("This Thread lock the code %s: %d\n\r", name, state);
     wait(0.5); //sleep
+    printf("Thread cross & unlock %s: %d\n\r", name, state); //OUTSIDE CODE BLOCK ---------
+    
     M_LOCK.unlock();  //After completing task unlock the code ------------- UNLOCK THE BLOCK
     
-    printf("Thread cross & unlock %s: %d\n\r", name, state); //OUTSIDE CODE BLOCK ---------
+//DO NOT WRITE any print statement after  unlock() it create missunderstanding ....
+/* print statement require more clk cycle,after  unlock the MUTEX Flag - schedular quickly schedule next thread before print the statement.*/
 }