[Bug libfortran/35063] [Regression wrt g77] I/O leaks handles/memory on Windows XP

[jvdelisle at gcc dot gnu dot org]

------- Comment #21 from jvdelisle at gcc dot gnu dot org  2008-02-08 03:14 -------
The problem manifests with:

$ gfc -v
Using built-in specs.
Target: i686-pc-cygwin
Configured with: ../gcc43/configure --prefix=/usr/local/gfortran
--enable-languages=c,fortran --disable-bootstrap --enable-threads=posix
--enable-sjlj-exceptions --enable-version-specific-runtime-libs --enable-nls
--disable-libmudflap --disable-shared --disable-win32-registry
--with-system-zlib --enable-checking=release --enable-werror
--without-included-gettext --without-x --enable-libgomp
Thread model: posix
gcc version 4.3.0 20080128 (experimental) [trunk revision 131899] (GCC) 

I removed the mutex_lock code from the relevant sections of
libgfortran/io/unit.c for internal units and the handle count growth goes away.
This confirms the problem.  I am still working the solution and have two
approaches.  One is to modify the mutex_unlock to delete the semaphore created
and thus release the handle (Danny Smith idea).  The other is to keep track of
units assigned as internal and not create a new unit structure, but reuse the
old. Stay tuned.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35063