Microsoft KB Archive/118547

= PRB: Multithreaded Program Crashes =

PSS ID Number: 118547

Article Last Modified on 5/4/2001

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The information in this article applies to:


 * Microsoft Fortran Powerstation 32 for Windows NT 1.0

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This article was previously published under Q118547



SYMPTOMS
A program that uses the multithread run-time library fails to run to completion or generates a Dr. Watson access-violation error message.



CAUSE
This behavior can occur if the compile options are not consistent with the libraries included in linking.



RESOLUTION
If the program is linked using the MSFRT.LIB and MSVCRT.LIB files, your object modules must be compiled using the -MD option.

NOTE: This behavior was changed in Microsoft FORTRAN PowerStation version 4.0.



MORE INFORMATION
To demonstrate the problem and workaround, compile the sample code below (TESTC), using the four different tests listed. The first two tests demonstrate the problem, while the last two tests show two sets of options that do not cause problems:

Test 1
The TESTC created using these options will produce a Dr. Watson error message: CL -c TESTC.CPP FL32 -LD TESTF.FOR FL32 -MD TESTC.OBJ TESTF.LIB

Test 2
The TESTC created using these options will not produce an error message, but will fail to run completely and will not produce any output: CL -c -MD TESTC.CPP FL32 -LD TESTF.FOR FL32 -ML TESTC.OBJ TESTF.LIB -or- FL32 -MT TESTC.OBJ TESTF.LIB

Test 3
The TESTC created using these options will create a TESTC program that is linked to MSFRT.LIB and MSVCCRT.LIB. The actual run-time code is in the DLLs MSFRT10 and MSVCRT10. This TESTC will correctly display the message, "Factorial of 7 is: 5040": CL -c -MD TESTC.CPP FL32 -LD TESTF.FOR FL32 -MD TESTC.OBJ TESTF.LIB

Test 4
The TESTC created using these options has the run-time code statically linked into the executable file. It will also correctly display the message, "Factorial of 7 is: 5040": CL -c TESTC.CPP FL32 -LD TESTF.FOR FL32 -ML TESTC.OBJ TESTF.LIB -or- FL32 -MT TESTC.OBJ TESTF.LIB

C Sample Code
/* Compile options needed: see text above #include   extern "C" {void __stdcall FACT (int n, int *amt);} int main { int amt; FACT(7, &amt); cout << "Factorial of 7 is: " << amt; return 0; }

FORTRAN Sample Code
C Compile options needed: see text above SUBROUTINE Fact[DLLEXPORT](n, amt) INTEGER*4 n [VALUE] INTEGER*4 amt [REFERENCE] INTEGER*4 i     amt = 1 DO i = 1, n       amt = amt * i      END DO      END

Additional query words: 1.00 multi-thread

Keywords: kbcode kbCompiler KB118547

Technology: kbAudDeveloper kbFORTRANPower32100NT kbFortranSearch kbZNotKeyword2

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