diff -r ebc84c812384 -r 46218c8b8afa Symbian3/PDK/Source/GUID-9D00655C-AFBA-5DF7-B11B-6B2355BDF08D.dita --- a/Symbian3/PDK/Source/GUID-9D00655C-AFBA-5DF7-B11B-6B2355BDF08D.dita Thu Mar 11 15:24:26 2010 +0000 +++ b/Symbian3/PDK/Source/GUID-9D00655C-AFBA-5DF7-B11B-6B2355BDF08D.dita Thu Mar 11 18:02:22 2010 +0000 @@ -1,13 +1,13 @@ - - - - - -Using Semaphores

Semaphores are provided to synchronise co-operating threads. They are Kernel objects and, as such, are managed by the Kernel.

Access to a semaphore is through an RSemaphore handle.

The semaphores are counting semaphores, having a TInt count value that is incremented by calling the Signal() member function of the semaphore handle and decremented by calling the Wait() member function of the semaphore handle. A semaphore with a negative value implies that a thread must wait for the completion of some event.

The mechanism by which a thread waits on a semaphore is part of the overall management of thread scheduling.

For general applications, it is not common to explicitly create a semaphore; most applications are interested in making asynchronous requests to service providers. When a thread is created, a request + + + + + +Using Semaphores

Semaphores are provided to synchronise co-operating threads. They are Kernel objects and, as such, are managed by the Kernel.

Access to a semaphore is through an RSemaphore handle.

The semaphores are counting semaphores, having a TInt count value that is incremented by calling the Signal() member function of the semaphore handle and decremented by calling the Wait() member function of the semaphore handle. A semaphore with a negative value implies that a thread must wait for the completion of some event.

The mechanism by which a thread waits on a semaphore is part of the overall management of thread scheduling.

For general applications, it is not common to explicitly create a semaphore; most applications are interested in making asynchronous requests to service providers. When a thread is created, a request semaphore is also created that support asynchronous requests.

After making one or more asynchronous requests, a thread calls User::WaitForAnyRequest() to wait for one of the requests to complete or calls User::WaitForRequest() to wait for a specific request to complete. A service provider calls User::RequestComplete() to signal request completion.

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