JCL Help:TJclOptex.Enter
JCL Help: TJclOptex.Enter Method
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Summary
Enters the Optex.
Pascal
public procedure Enter;
Description
Enter attempts to get access to the optex, this is referred to as acquiring ownership of the optex. Only one thread can own the optex at any time. If the optex is currently owned by a different thread the function blocks until the critical section becomes free. After acquiring ownership of the optex you must release it as soon as you are done with it by calling the Leave method. Although only one thread can own the optex, a single thread can own the optex more than once. This means you can call Enter multiple times. However, calls to Enter and Leave must be balanced: you must call Leave for each time you call Enter. Note that if the process is running on a multiprocessor system and the optex is currently owned by anther thread, the Enter method spins in a loop SpinCount number of times, trying to acquire the optex. If the optex becomes available before the loop terminated the thread acquires the optex and returns. On a single-processor system the method only tries one time.
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Marcel van Brakel
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