BUG: Memory Leak Caused by Formatted Internal WRITE

ID: Q149154

The information in this article applies to:

Microsoft Fortran PowerStation for Windows 95 and Windows NT, version 4.0

SYMPTOMS

Performing a formatted internal WRITE causes a memory leak. A memory leak is caused by a program not releasing the memory it allocates.

RESOLUTION

Use list-directed I/O with an internal WRITE.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

In the following sample code, the memory storage area associated with the character string "LLINE" is not released after each internal WRITE. Consequently, additional memory must be allocated for each subsequent internal WRITE utimately causing all physical and virtual memory to be exhausted.

Sample Code to Illustrate Problem and Workaround


! Compile options needed: none

      PROGRAM TEST
      INTEGER I
      CHARACTER LLINE*32
      DO I=1,1000000
          WRITE(LLINE, '(I10,E20.5)') I, REAL(I) ! Memory leak here
!          WRITE(LLINE, *) I, REAL(I) ! Uncomment this line for workaround
      END DO
      END

Additional query words: 4.00

Keywords : kbFortranPS kbLangFortran
Version : :4.0
Platform : NT WINDOWS
Issue type :