PISemaphore Class Reference

Basic semaphore. More...

#include <pisemaphore.h>

Public Member Functions
PISemaphore	PISemaphore (int initial=0)
	Constructs semaphore with "initial" available resources.
	~PISemaphore ()
	Destroy semaphore.
void	acquire (int cnt=1)
	Acquire "cnt" resources. If no available resources, than blocks until they freed.
bool	tryAcquire (int cnt=1)
	Try to acquire "cnt" resources. Returns if operation was successfull.
bool	tryAcquire (int cnt, PISystemTime timeout)
	Try to acquire "cnt" resources for "timeout". Returns if operation was successfull (timeout has not expired).
void	release (int cnt=1)
	Release "cnt" resources.
int	available () const
	Returns available resources count.

Detailed Description

Basic semaphore.

Synopsis

PISemaphore provides critical code section defence between several threads with resource counting. Semaphore contains logic counter and functions to change it: release(), acquire() and tryAcquire().

For automatic acquire-release use PISemaphoreLocker.

Usage