Hi,

While investigating http://bugs.freepascal.org/view.php?id=14335 I ran into the following peculiarities. Please, comment and tell for which item you want bug reports, if any. I tested on i386-linux.

1. The docs of GetThreadId seems to contain a typo: http://lazarus-ccr.sourceforge.net/docs/rtl/system/getthreadid.html "GetThreadID returns the current process ID." -> should be thread ID.

2. The docs of MainThreadID say it is unused. But it is used in TThread.Synchronize. http://lazarus-ccr.sourceforge.net/docs/rtl/classes/mainthreadid.html

Given the following program:
program project1;
{$mode objfpc}{$H+}
uses
   //cthreads,
   Classes;
begin
   writeln('GetThreadID=', GetThreadID);
   writeln('GetCurrentThreadID=', GetCurrentThreadId);
   writeln('MainThreadID=', MainThreadID);
end.

3. If cthreads is not used, all values are 1. No problem with that, although I am not sure those are real thread id, at least on i386-win32 the value changes on each run, e.g. 1908, 576, maybe because threadmanager is already included in windows. Anyway, this is not a problem, as long as they all have the same value in a single threaded application

If cthreads is used, I get the following output:
GetThreadID=3084795456
GetCurrentThreadID=3085236992
MainThreadID=3085236992

4. What is the difference between GetThreadID and GetCurrentThreadID? This code runs in the same thread, so I expect the same value.

Vincent

Hello FPC-Pascal,

Tuesday, September 8, 2009, 2:02:46 PM, you wrote:

VS> If cthreads is used, I get the following output: VS> GetThreadID=3084795456
VS> GetCurrentThreadID=3085236992
VS> MainThreadID=3085236992

VS> 4. What is the difference between GetThreadID and VS> GetCurrentThreadID? This code runs
VS> in the same thread, so I expect the same value.

Hmmm... It looks to me as GetThreadID return the current thread handle instead the ID. In Windows both are different things but I do not know in other OS.

Anyway the name is badly choosen as it conflicts with Windows GetThreadID(ThreadHandle) function.

I am not convinced, on windows they are the same, on i386-linux they are different.

Vincent

I guess I need to submit three bug reports to get an answer. :-)

Vincent