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From: | Jonathan Larmour |
Subject: | Re: [lwip-users] SemSignal gets called on a already signaled semaphore |
Date: | Fri, 01 Jun 2007 15:11:27 +0100 |
User-agent: | Thunderbird 1.5.0.12 (X11/20070530) |
Goldschmidt Simon wrote:
So far I have used Win32, µC/OS-II and embOS and I haven't used condidtion variables before (or I don't get your examples...).pthread_cond_wait on linux/POSIX, and SignalObjectAndWait and WaitForSingleObject on Win32 (taking mutexes as the object).Can you give an example under thos systems or linux?But WaitForSingleObject() is like mutex_lock() (with a timeout), isn't it? Where's the condition variable with that? Or did you mean to implement counting semaphores using mutexes???
Sorry, I wasn't clear - SignalObjectAndWait is the more important and interesting one, and it takes an Event. Signalling the condition variable is SetEvent.
Anyway, this is getting rather off-topic. And I think with the approach we're now discussing in bug #200021, we won't need to worry about specific semaphore implementations any more anyway.
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