[v3] libstdc++/46455 - fix mutex and condvar leaks

[Jonathan Wakely]

On 18 November 2010 02:42, Jonathan Wakely wrote:
> This change adds destructors to the mutex types in the library, it's
> not trivial and could do with more testing on platforms where thread
> model != posix.  I hacked the gthr headers to reproduce leaks under
> valgrind and think I've tested all the code paths, but I don't have
> anything suitable to add to the testsuite.

Attached is a modified gthr header I've been testing with, it might
prove useful to someone else one day.  Save this as
$foo/bits/gthr-default.h then compile with -I$foo to turn un-destroyed
mutexes into memory leaks, easily detected by valgrind. Use -DWINSTYLE
to exercise the win32 case.
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