semaphore.c File Reference

#include <stdio.h>
#include <fcntl.h>
#include "core_message.h"
#include "sem.h"
#include "utils.h"

Include dependency graph for semaphore.c:

Functions
void	semaphore_handle_exit ()
int	semaphore_init (struct Semaphore *s, const char *name, const int value)
int	semaphore_wait (struct Semaphore *s)
int	semaphore_post (struct Semaphore *s)
void	semaphore_destroy (struct Semaphore *s)

Variables
struct Semaphore *	semaphores [1000] = {0}
bool	semaphore_handle_exit_ready = false

Function Documentation

semaphore_init()

int semaphore_init	(	struct Semaphore *	s,
		const char *	name,
		int	value )

Initialize a cross-platform semaphore (Linux/Darwin)

 c
#include "sem.h"
 
int main(int argc, char *argv[]) {
    struct Semaphore s;
    if (semaphore_init(&s, "mysem", 1)) {
        perror("semaphore_init failed");
        exit(1);
    }
    if (semaphore_wait(&s)) {
        perror("semaphore_wait failed");
        exit(1);
    }
 
    //
    // Critical section
    // CODE HERE
    //
 
    if (semaphore_post(&s)) {
        perror("semaphore_post failed");
        exit(1);
    }
 
    semaphore_destroy(&s);
}

Parameters

s	a pointer to Semaphore
name	of the semaphore
value	initial value of the semaphore

Returns

-1 on error

0 on success