> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Dave Korn > Sent: Thursday, July 05, 2007 11:48 AM > To: cygwin@cygwin.com > Subject: RE: Interference between instances on MS-Windows > > On 05 July 2007 16:33, Bob McConnell wrote: > > > > If I read this right, you are saying there are no reported > conflicts in > > pthread resources between multiple processes. That is all I > wanted to > > know. I don't like to waste time diagnosing known problems > and then be > > told much later that there is an easy workaround. > > > > I wasn't asking anyone to debug either my code or Cygwin. All I was > > asking is if there are any known threading issues in this > situation. I > > have no idea how you implemented pthreads, nor do I care. > Just knowing > > that this may be covering new ground is adequate. > > Well yeh, but there might be /unknown/ problems in the > pthreads code, which > we'd love to fix if we knew they were there.
Silly me, it looks like the sample code I found from a Google search will do nicely as a test case. From my own tests, I found that if I eliminate the message queue and simply sleep more than enough time to get the ACK from the host, two instances would run in the same time as a single instance. When I use the queue, two instances take twice as long. Sometime this morning, the light bulb came on. I added an elapsed time calculation to the example I copied the queue from and increased the iteration count by an order of magnitude to make it run long enough to make a difference. A single instance will complete in 18 seconds. Two instances take 36 seconds. (Actually, one falls somewhere in between, but the other always takes 36.) I have attached that code with the timers. Compile command: gcc -o ex2 ex2b.c -Wall<Enter> System: CYGWIN_NT-5.0 1.5.24(0.156/4/2) 2007-01-31 10:57 Win2K SP4 P4 3.0GHz, 1 GB RAM Any suggestions would be appreciated. Bob McConnell
ex2b.c
Description: ex2b.c
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