Archive of UserLand's first discussion group, started October 5, 1998.

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Re: Check status of a semaphore without trying to change it?

Author:	Brent Simmons
Posted:	8/24/1999; 12:01:34 PM
Topic:	Check status of a semaphore without trying to change it?
Msg #:	9820 (In response to 9819)
Prev/Next:	9819 / 9821

Here's another way:

Try to lock the semaphore with a short timeout of 1 tick. If it fails, it's locked already. If it succeeds, it wasn't locked. (You may then want to unlock it, depending on what you want to do.)

This changes the value -- but for very little time.

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