main.c

#include "semaphore.h"

int main(int argc, char **argv) {
	sem_t *sem = sem_open("example_semaphore", O_CREAT | O_EXCL, 0, 1);
	
	/*check if semaphore failed*/
	if (sem == SEM_FAILED) {
		printf("Failed to acquired semaphore\n");
		return -1;
		}

	printf("About to enter critical code block 1\n");
	sem_wait(sem);
    
	/*Critical Code Block 1*/
	printf("In critical code block 1\n");
	Sleep(2000);
	printf("Finished critical code block 1\n\n");
	sem_post(sem);
    
	/*Normal Block 1*/
	printf("Normal code block 1\n");
	printf("About to enter critical code block 1\n");
	sem_wait(sem);
    
	/*Critical Code Block 2*/
	printf("In critical code block 2\n");
	Sleep(2000);
	printf("Finished critical code 2\n\n");
	sem_post(sem);
    
	/*Normal Block 2*/
	printf("Normal code block 2\n\n");
	
    /*clean up*/
	sem_unlink("example_semaphore");
	printf("exiting\n");
	sem_close(sem);
	return 0;
	}