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Message-ID:	<01C075A3.37A23430.trn@terma.com>
From:	Torben Nielsen <trn AT terma DOT com>
To:	"'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Cc:	"'trn AT terma DOT com'" <trn AT terma DOT com>
Subject:	Error in sem_init (cygwin-1.1.7-1)
Date:	Wed, 3 Jan 2001 16:37:01 +0100
Organization:	TERMA Elektronik AS
X-Mailer:	Microsoft Internet E-mail/MAPI - 8.0.0.4211
MIME-Version:	1.0

Hi!
The following code sequence fails (does not wait):

	sem_t sem;
	sem_init(&sem, 0, 0);
	sem_wait(&sem);

I believe the reason is found in ./winsup/cygwin/thread.cc line 437 (20001228 snapshot):

	item->win32_obj_id = ::CreateSemaphore (&sec_none_nih, _v, _v, NULL);

The third parameter is the maximum count for the semaphore, and it is not allowed to be zero or less
according to Microsofts documentation. If I replace this line with

	item->win32_obj_id = ::CreateSemaphore (&sec_none_nih, _v, LONG_MAX, NULL);

the above example works just fine. If possible, I would like a comment on this.

Regards, Torben Nielsen


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