It appears that I can enter a mutex from two different threads at the same time, which should of course be impossible.
I have made a very simple program to test this. It consists of a test class derived from Thread, which in simply enters and leaves the mutex once every second.
At the same time the main thread does the same, but twice per second.
As you can see from this little excerpt of the programs output, neither thread blocks when it should:
main(): entering test
2092: entering test
main(): leavingtest
main(): entering test
2092: leavingtest
main(): leavingtest
This is with version 1.5.7, as 1.5.9 won't even compile.
I am using gcc 3.4.2 mingw to compile.
I have built ccgnu2 1.5.7 by running ./configure, make, make install from inside the msys environment.
The exact same code works as expected on Linux (ccgnu 1.5.6 on Ubuntu).
