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Subject:	problem about SEMAPHORE at cygwin 1.5.7
To:	cygwin AT cygwin DOT com
Message-ID:	<OF6D065114.BD53B1C1-ON48256E4A.00194F4A@legend.com.cn>
From:	xuzhd AT Lenovo DOT com
Date:	Mon, 1 Mar 2004 12:36:57 +0800
MIME-Version:	1.0
Note-from-DJ:	This may be spam

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(See attached file: lcctestsem.c)

problem about SEMAPHORE  at cygwin 1.5.7

cygwin 1.5.7
cygserver as ipc server

a process has gotten semaphore using SEM_UNDO, when the  process aborts, it
should release corresponding semaphore at Linux.But at Cygwin 1.5.7,1.5.4,
1.3.22, I cannot prove it. is it a bug to cygwin ? thank you


the following is my program's result.




Administrator AT node1 ~
$ ./a.exe  ( the first running)
before Get semaphore exclusively...
         semval[0] = 8
after Get semaphore ...
         semval[0] = 7
before release semaphore exclusively...
         semval[0] = 7
before release semaphore exclusively...
         semval[0] = 8

Administrator AT node1 ~
$ ./a.exe                ( the second running, gets semaphore and releases
semaphore successfully)
Test semaphore has existed.
Get test semaphore...
         semval[0] = 8
Get test semaphore successfully.
before Get semaphore exclusively...
         semval[0] = 8
after Get semaphore ...
         semval[0] = 7
before release semaphore exclusively...
         semval[0] = 7
before release semaphore exclusively...
         semval[0] = 8

Administrator AT node1 ~
$ ./a.exe                ( the third running, gets semaphore
successfully,but fails to  release semaphore )
Test semaphore has existed.
Get test semaphore...
         semval[0] = 8
Get test semaphore successfully.
before Get semaphore exclusively...
         semval[0] = 8
after Get semaphore ...
         semval[0] = 7
before release semaphore exclusively...

Administrator AT node1 ~
$ ./a.exe           ( the fourth running, proves that the third running
didnot release semephore when aborting , a bug ????)
Test semaphore has existed.
Get test semaphore...
         semval[0] = 7
Get test semaphore successfully.
before Get semaphore exclusively...
         semval[0] = 7
after Get semaphore ...
         semval[0] = 6
before release semaphore exclusively...
         semval[0] = 6
before release semaphore exclusively...
         semval[0] = 7

Administrator AT node1 ~
$ */


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