Jaydeep Shah / Mbed OS 21_MUTEX_LOCK_UNLOCK

MUTEX and its use in MBED MUTEX LOCK and Unlock mechanism

Files at this revision

API Documentation at this revision

Revision 1:605f5624661e, committed 2020-07-26

Comitter:
radhey04ec
Date:
Sun Jul 26 10:59:21 2020 +0000
Parent:
0:b908013d70cd
Child:
2:0cf7e435eeb8
Commit message:
UPDATE to clear confusion of priority of thread and mutex. But there is no relation. prinf misguide me

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-os.lib Show annotated file Show diff for this revision Revisions of this file 
--- 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.*/
 }
 
 

--- a/mbed-os.lib	Sat Jul 25 09:46:26 2020 +0000
+++ b/mbed-os.lib	Sun Jul 26 10:59:21 2020 +0000
@@ -1,1 +1,1 @@
-https://github.com/ARMmbed/mbed-os/#cf4f12a123c05fcae83fc56d76442015cb8a39e9
+https://github.com/ARMmbed/mbed-os/#3ab72c71b75cb9cb91160a54fba22ec43b036ed2