[Corelinux-develop] Questions (again)

[Hans - D. <dul...@eg...>]

I'm implementing EventSemaphore in the following setup:

Assuming we have three operations: down(), up(), and zero().

When an EvSem is created, its value is initialized to 1 indicating the
expected event has not occured.
Any callers who are waiting for the event to occur will do a "lock"
by calling zero(). When the event actually takes place, the semaphore will
be released via the down() operation.

The requirement document (SRS ?) for says that the Many-to-One semaphores
will automatically lock upon creation and there is no option to create in
unlock. When I look at the code, lock is similar to down() semaphore
operation which implies that the creator will be block in the middle of
the EventSemaphore ctor.

In the context of the above three operations, how can the creator perform
a release operation to indicate that the expected event has occured?

-- 
Hans Dulimarta, Ph.D.                  dul...@co...
P: 517-432-7589             http://www.egr.msu.edu/~dulimart   
F: 760-281-7691             http://corelinux.sourceforge.net
Elec. & Comp. Engg., Mich. State Univ., E. Lansing, MI 48824