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Semaphore Class Reference

Binary semaphore. More...

#include <semaphore.h>

List of all members.

Public Methods
	Semaphore (const String &name)
	Constructor. More...
	~Semaphore ()
	Destructor.
void	wait ()
	Lock semaphore. More...
void	release ()
	Unlock semaphore. More...
void	reset ()
	Reset semaphore. More...
Private Attributes
int	_semid
	unix semaphore identifier.

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Detailed Description

Binary semaphore.

This class implements IPC semaphore. Implementation of this class is platform/system dependent. Semaphore is automatically locked after it is created.

Author:

Marek Przeczek

Definition at line 47 of file semaphore.h.

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Constructor & Destructor Documentation

Semaphore::Semaphore (  const String &    name )

Constructor. Opens a semaphore with given name. If semaphore doesn't exist, new one is created. It is automatically locked after it is created. Parameters: name  unique name (4 characters long only) Definition at line 37 of file semaphore.cpp.

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Member Function Documentation

void Semaphore::release (    )

Unlock semaphore. This method releases semaphore locked by previous call to wait() method. See also: wait() Definition at line 70 of file semaphore.cpp. Referenced by CommunShMem::initialize(), CommunShMem::operator<<(), CommunShMem::operator>>(), and CommunShMem::~CommunShMem().

void Semaphore::reset (    )

Reset semaphore. It resets semaphore and sets its default value (locked by one). Implemented only on Unix systems because of troubles with JVM. Definition at line 80 of file semaphore.cpp. Referenced by Semaphore(), CommunShMem::initialize(), and CommunShMem::~CommunShMem().

void Semaphore::wait (    )

Lock semaphore. If the semaphore is already locked, calling thread waits on semaphore until another process (or thread) will release it. See also: release() Definition at line 60 of file semaphore.cpp. Referenced by CommunShMem::initialize(), CommunShMem::isReady(), CommunShMem::operator<<(), and CommunShMem::operator>>().

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The documentation for this class was generated from the following files:

• semaphore.h
• semaphore.cpp

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