Re: [HACKERS] Semaphores

Nailah Ogeer wrote:
> Hi all,
> Just wanted to know how postgres handles semaphores. Was hoping that i can
> can use the locks defined in lwlock.h and lwlock.c . If i create a new
> lock and then use LockAcquire and
> LockRelease when I want a process to start and stop will this work?

Uh, well, we usually try to get a lock via a test-and-set assembly
language call into shared memory, and if we fail, we then get a
semaphore and wait for someone to wake us up.

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