GrayLib::cSemaphore Class Reference

#include <cSemaphore.h>

Public Member Functions
	cSemaphore (int iUnlockedCount, int iMaxCount, const FILECHAR_t *pszName=nullptr)
	~cSemaphore ()
bool	isValidSemaphore () const
bool	LockWait (TIMESYSD_t tWait=cTimeSys::k_INF)
bool	Unlock (LONG nReleaseCount=1, LONG *plPreviousCount=nullptr)

Public Attributes
sem_t	m_sem
	Unnamed semaphore. More...
sem_t *	m_pSem
	pthread semaphore. More...

Detailed Description

A semaphore allows X users of the locked resource. All others must wait. Allow interprocess naming of the semaphore resource. i.e. A mutex allows only one user. Semaphore(1) = mutex Mutex = 1 bathroom door 1 lock. Semaphore = a set of X keys to X bathrooms. like the MFC class cSemaphore http://www.cse.psu.edu/~dheller/cse411/notes/OSC/posix.html

Constructor & Destructor Documentation

cSemaphore()

GrayLib::cSemaphore::cSemaphore ( int  iUnlockedCount, int  iMaxCount, const FILECHAR_t *  pszName = nullptr  )

inline

Create a new semaphore.

• iUnlockedCount = the number of signaled states to start <= iMaxCount. iUnlockedCount < 0 = just open an existing semaphore by pszName. don't create a new one.

~cSemaphore()

GrayLib::cSemaphore::~cSemaphore ( )

inline

Member Function Documentation

isValidSemaphore()

bool GrayLib::cSemaphore::isValidSemaphore ( ) const

inline

LockWait()

bool GrayLib::cSemaphore::LockWait ( TIMESYSD_t  tWait = cTimeSys::k_INF )

inline

Acquire a single lock. wait if i have to. Used by cSemaphoreLock

Unlock()

bool GrayLib::cSemaphore::Unlock ( LONG  nReleaseCount = 1, LONG *  plPreviousCount = nullptr  )

inline

Release nReleaseCount locks on the semaphore.

Member Data Documentation

m_pSem

sem_t* GrayLib::cSemaphore::m_pSem

pthread semaphore.

m_sem

sem_t GrayLib::cSemaphore::m_sem

Unnamed semaphore.

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

• c:/Dennis/Source/Gray/GrayLib/include/Thread/cSemaphore.h