Author: Tony Werten
Date: 01:10:53 09/09/03
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On September 09, 2003 at 03:21:34, Andreas Herrmann wrote: >On September 09, 2003 at 02:14:08, Tony Werten wrote: > >Hi Tony, > >i have just read inside a Delphi internals book last week a 50 side long capitel >about Thread programming. It says that all local vars are save, but pay >attention for global vars. See the help to the win api function >EnterCriticalSection or the VCL object TCriticalSection as a good starting point >to this theme. > >Andreas Thanks ( to all) It seems that "write" is not threadsafe when used for writing to the console. I added some checks to make sure only 1 thread is writing at a time. Hope this solves the problems. The problems became worse when I changed from writeln to write which seems logic: more time spend in writing so bigger change for collisions. Tony > > > >>Hi, >> >>maybe a silly question, but one get quite desperate during debugging. Suppose I >>have the followin code: >> >>procedure whatever(param:integer) >>begin >> do_something_heavy_with_param; >>end; >> >>Say, the heavy stuff takes about 10 seconds. >> >>If during these secs another thread is calling this function, what happens ? >> >>Does every thread gets a "local copy" of the function ? >> >>On a single processor, there is a context switch, stuff is pushed on a stack, >>and everything is safe. >> >>What about a dual ? I get the feeling that param is actually changed by the >>second call. >> >>Tony
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