- GftThreads

From: [at]} <René>
Date: Wed, 27 Apr 2005 23:16:26 -0400

----boundary-LibPST-iamunique-842511577_-_- Content-type: text/plain We have been experimenting with windows threads in Component Pascal for a long while. As a matter of fact we have implemented a subset of MODULA-3 thread interface in Component Pascal. I can mention the most striking troubles we have run into: 1. Threads can not use Out or StdLog. We have develop ad hoc modules for multi-thread output. 2. Neither can they use ASSERT: if the assertion fails the system will hang up. The big problem is that Run Time Support, and BlackBox modules do use ASSERT, so even if your code avoid it you can be trapped and hang the system up. 3. Don't use HALT. 4. Finally: garbage collection is not thread safe. Which is a very big problem! (It was pointed out to us by Oberon Microsystem at the very beginning of our project). Cheers: René Dorta. Universidad de Carabobo. Venezuela. Douglas G. Danforth wrote: Folks, I have implemented a module GftThreads that works for simple tasks and operates in nanosecond response times (16ns on my machine). The simple interface (patterned a little after Services.Action) looks like. DEFINITION GftThreads; TYPE Action = POINTER TO ABSTRACT RECORD (a: Action) Do, NEW, ABSTRACT; (a: Action) Start, NEW; (a: Action) Stop, NEW END; END GftThreads. Calling action.Start puts the function action.Do into a tight loop running in a child thread. Calling action.Stop from the parent terminates this loop and the thread. The child shares the memory space of the parent. However, I am getting in over my head. The functions that the user places in action.Do must be 'thread-safe'. Neither Out.String, nor XYplane.Dot seem to satisfy the 'thread-safe' condition. They both work for a single Start-Stop pair but a second Start causes the system to hang (for Out there seems to be an interaction with the routines that write to the log and preconditions are violated). I would like the user not have to worry about 'thread-safety' and so believe something like critical regions are necessary. Does anyone have experience with Windows' threads that could give some pointers? -Doug --- BlackBox --- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy ----boundary-LibPST-iamunique-842511577_-_- Content-type: application/rtf Content-transfer-encoding: base64 Content-Disposition: attachment; filename="rtf-body.rtf" e1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcZnJvbWh0bWwxIFxkZWZmMHtcZm9udHRibA0Ke1xmMFxm c3dpc3NcZmNoYXJzZXQwIEFyaWFsO30NCntcZjFcZm1vZGVybiBDb3VyaWVyIE5ldzt9DQp7XGYy XGZuaWxcZmNoYXJzZXQyIFN5bWJvbDt9DQp7XGYzXGZtb2Rlcm5cZmNoYXJzZXQwIENvdXJpZXIg TmV3O319DQp7XGNvbG9ydGJsXHJlZDBcZ3JlZW4wXGJsdWUwO1xyZWQwXGdyZWVuMFxibHVlMjU1 O30NClx1YzFccGFyZFxwbGFpblxkZWZ0YWIzNjAgXGYwXGZzMjQgDQp7XCpcaHRtbHRhZzI0MyA8 IURPQ1RZUEUgaHRtbCBQVUJMSUMgIi0vL1czQy8vRFREIEhUTUwgNC4wMSBUcmFuc2l0aW9uYWwv L0VOIj59DQp7XCpcaHRtbHRhZzMgXHBhciB9DQp7XCpcaHRtbHRhZzE5IDxodG1sPn0NCntcKlxo dG1sdGFnMiBccGFyIH0NCntcKlxodG1sdGFnMzQgPGhlYWQ+fQ0Ke1wqXGh0bWx0YWcxIFxwYXIg 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----boundary-LibPST-iamunique-842511577_-_--- Received on Thu Apr 28 2005 - 05:16:26 UTC