/home/andref/projetos/epos--/include/mutex.h

// EPOS-- Mutex Abstraction Declarations

// This work is licensed under the Creative Commons
// Attribution-NonCommercial-NoDerivs License. To view a copy of this license,
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// Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

#ifndef __mutex_h
#define __mutex_h

#include <common/synchronizer.h>

__BEGIN_SYS

class Mutex : public Synchronizer_Common {
private:
        typedef Traits<Mutex> Traits;
        static const Type_Id TYPE = Type<Mutex>::TYPE;

public:
        Mutex() : _locked(false) {db<Mutex>(TRC) << "Mutex()\n";}
        ~Mutex() {db<Mutex>(TRC) << "~Mutex()\n";}

        void lock() {
                db<Mutex>(TRC) << "Mutex::lock()\n";
                while(tsl(_locked))
                sleep();
        }

        void unlock() {
                db<Mutex>(TRC) << "Mutex::unlock()\n";
                _locked = false;
                wakeup();
        }

        static int init(System_Info *si);

private:
        volatile bool _locked;
};

__END_SYS

#endif

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