Author: Robert Hyatt
Date: 08:11:17 09/09/03
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On September 09, 2003 at 02:14:08, Tony Werten wrote: >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 ? It gets executed. :) > >Does every thread gets a "local copy" of the function ? A local copy of "the local data". They share instructions and global data. > >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. Param is _local_. However, if the function uses global data, that has to be properly managed with a MUTEX-type lock. > >Tony
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