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Ross, GetLastError returns the calling threadís last error code value. So, it only has meaning after an error. The last error code is maintained on a per-thread basis so multiple threads do not overwrite each otherís last-error code. In your test driver, you are calling GetLastError in "non-error" situations so the return value will represent some error that happened "who knows when". Appearently on Win98 some MS internal code called an unsupported function when creating your process. I would not be concerned about this since they (MS) probably handled that situation internally. Hope this helps, Scott -----Original Message----- From: Ross Johnson <email@example.com> To: POSIX threads on Win32 <firstname.lastname@example.org> Date: Tuesday, February 23, 1999 4:32 AM Subject: RE: TryEnterCriticalSection on Win98 >> >> I haven't looked in detail at what GetLastError actually does, ie. >> whether it's possible for it to return an error from some function >> called prior to TryEnterCriticalSection. If TryEnter doesn't return >> an error, then maybe it doesn't reset any previous error info >> either. I don't know yet. >> > >Ok. I've modified the test code I posted last time (new version >below) and have come up with something a little odd again. I must >surely be missing something. > >My first test prints the value returned by GetLastError after each >critical section function call (names abbreviated in the output). I >also print the value at the very start of main(). I run the same >.exe on Win98 and WNT, and get different results. First, the output >from the .exe compiled and linked by Mingw32 on the Win98 box: > >[Win98] >H:\PTHREADS\tests>tryentercs.exe >Error before: 120 >TryEnterCriticalSection exists: Yes [address: BFFA9031] >TryEnter: 120 >Init: 120 >Leave: 120 >Delete: 120 > > >[WNT] >C:\PTHREADS\test>tryentercs.exe >Error before: 0 >TryEnterCriticalSection exists: Yes [address: 77F67518] >TryEnter: 0 >Init: 0 >Leave: 0 >Delete: 0 > >