utility.cpp File Reference

#include "../include/utility.h"

Functions
intptr_t *	connect_shm ()
int	semsetall (int sem_group, int number_in_group, int value)
int	p (int sem_group, int donut_type)
int	v (int sem_group, int donut_type)

Function Documentation

connect_shm()

intptr_t* connect_shm

(

)

function for connecting shared memmory to address space.

Returns

A pointer to the top of the shared memory space

p()

int p	(	int	sem,
		int	counter
	)

Decraments a semaphore.

Parameters

sem	The semaphore to access
counter	the counter to decrament

Returns

value of system call. fail if < 0.

semsetall()

int semsetall	(	int	sem_group,
		int	number_in_group,
		int	value
	)

Initializes all counters in a semaphore.

Parameters

sem_group	The semaphore to initializes.
number_in_group	Number of counters in the group.
value	The initial value to set.

Returns

value of system call. fail if < 0.

v()

int v	(	int	sem,
		int	counter
	)

Incraments a semaphore.

Parameters

sem	The semaphore to access
counter	the counter to incraments

Returns

value of system call. fail if < 0.