PISemaphore Class Reference

Counting semaphore that tracks available resource units. 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)
	Acquires cnt resource units, waiting until enough units become available.
bool	tryAcquire (int cnt=1)
	Tries to acquire cnt resource units without waiting.
bool	tryAcquire (int cnt, PISystemTime timeout)
	Tries to acquire cnt resource units within timeout.
void	release (int cnt=1)
	Releases cnt resource units and wakes waiting threads.
int	available () const
	Returns the current number of available resource units.

Detailed Description

Counting semaphore that tracks available resource units.

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