On Nov 1, 2006, at 4:49 PM, Roland Schwarz wrote:
I might miss the point. But the problem is not only how to emulate a recursive mutex, in case the operating system does not allow recursive locking, but how to expose these two kinds if they exist on the opsys API level. If they exist I'd rather use them, instead letting the library emulate. No?
Yes! template <> class recursive_mutex<native-type> { native_type mut_; public: void lock() {mut_.lock();} // or whatever straight drop through to the OS ... }; And yet you can still say recursive_mutex<upgradable_mutex> and get the (more expensive) emulation. This is just exactly how and why I want to template condition as well: template <class Lock> class condition { ... }; template <> class condition<native-type> { ... straight drop through to native-condition of native-mutex }; -Howard