MSP430 IAR C/C++ Compiler reference guide - Rice University

Functions__monitor int get_lock(void){if (the_lock == 0){/* Success, we managed to lock the lock. */the_lock = 1;return 1;}else{/* Failure, someone else has locked the lock. */return 0;}}/* release_lock -- Unlock the lock. */__monitor void release_lock(void){the_lock = 0;}The following is an example of a program fragment that uses the semaphore:void my_program(void){if (get_lock()){/* ... Do something ... */}}/* When done, release the lock. */release_lock();Example of implementing a semaphore in C++In C++, it is common to implement small methods with the intention that they should beinlined. However, the MSP430 IAR C/C++ Compiler does not support inlining offunctions and methods that are declared using the __monitor keyword.In the following example in C++, an auto object is used for controlling the monitorblock, which uses intrinsic functions instead of the __monitor keyword.#include volatile long tick_count = 0;Part 1. Using the compiler27