CSemaphore::CSemaphore

Constructs a named or unnamed CSemaphore object.

CSemaphore(
   LONG lInitialCount = 1,
   LONG lMaxCount = 1,
   LPCTSTR pstrName = NULL,
   LPSECURITY_ATTRIBUTES lpsaAttributes = NULL 
);

Parameters

lInitialCount
The initial usage count for the semaphore. Must be greater than or equal to 0, and less than or equal to lMaxCount.
lMaxCount
The maximum usage count for the semaphore. Must be greater than 0.
pstrName
The name of the semaphore. Must be supplied if the semaphore will be accessed across process boundaries. If NULL, the object will be unnamed. If the name matches an existing semaphore, the constructor builds a new CSemaphore object which references the semaphore of that name. If the name matches an existing synchronization object that is not a semaphore, the construction will fail.
lpsaAttributes
Security attributes for the semaphore object. For a full description of this structure, see SECURITY_ATTRIBUTES in the Windows SDK.

To access or release a CSemaphore object, create a CMultiLock or CSingleLock object and call its Lock and Unlock member functions.

Security Note
After creating the CSemaphore object, use GetLastError to ensure that the mutex did not already exist. If the mutex did exist unexpectedly, it may indicate a rogue process is squatting and may be intending to use the mutex maliciously. In this case, the recommended security-conscious procedure is to close the handle and continue as if there was a failure in creating the object.

Header: afxmt.h