![](/media/cache/profiles/acab0116c354964a558e65bdd07ff047.jpg.50x50_q85.jpg)
Comparing a wait with yield vs a polling-busy-wait
Fork of Task621-mbedos54 by
main.cpp
- Committer:
- noutram
- Date:
- 2016-03-09
- Revision:
- 5:31707531f715
- Parent:
- 4:dae8898e55fe
- Child:
- 6:2e463846b575
File content as of revision 5:31707531f715:
#include "mbed.h" #include "rtos.h" #include "string.h" #include <stdio.h> #include <ctype.h> #define DELAY 200 //Digital outputs DigitalOut onBoardLED(LED1); DigitalOut redLED(D7); DigitalOut yellowLED(D6); DigitalOut greenLED(D5); //Serial Interface Serial pc(USBTX, USBRX); //Digital inputs DigitalIn onBoardSwitch(USER_BUTTON); DigitalIn SW1(D4); DigitalIn SW2(D3); //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(); } yellowLED = 0; Thread::wait(DELAY); } } 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(); } redLED = 0; Thread::wait(DELAY); } } //Main thread int main() { redLED = 0; yellowLED = 0; greenLED = 0; //Main thread ID tidMain = Thread::gettid(); //Threads Thread t1(thread1); Thread t2(thread2); pc.printf("Main Thread\n"); while (true) { Thread::wait(osWaitForever); } }