solarmutex.hxx

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#ifndef INCLUDED_COMPHELPER_SOLARMUTEX_HXX
#define INCLUDED_COMPHELPER_SOLARMUTEX_HXX

#include <sal/config.h>

#include <assert.h>
#include <atomic>

#include <osl/thread.h>
#include <osl/mutex.hxx>
#include <comphelper/comphelperdllapi.h>

namespace comphelper {


class COMPHELPER_DLLPUBLIC SolarMutex {
public:
    typedef void (*BeforeReleaseHandler) ();

    SolarMutex();
    virtual ~SolarMutex();

    void SetBeforeReleaseHandler( const BeforeReleaseHandler& rLink )
         { m_aBeforeReleaseHandler = rLink; }

    void acquire( sal_uInt32 nLockCount = 1 );
    sal_uInt32 release( bool bUnlockAll = false );

    virtual bool tryToAcquire();

    // returns true, if the mutex is owned by the current thread
    virtual bool IsCurrentThread() const;

    static SolarMutex *get();

protected:
    virtual sal_uInt32 doRelease( bool bUnlockAll );
    virtual void doAcquire( sal_uInt32 nLockCount );

    osl::Mutex            m_aMutex;
    sal_uInt32            m_nCount;

private:
    std::atomic<oslThreadIdentifier> m_nThreadId;

    SolarMutex(const SolarMutex&) = delete;
    SolarMutex& operator=(const SolarMutex&) = delete;

    BeforeReleaseHandler  m_aBeforeReleaseHandler;
};

inline void SolarMutex::acquire( sal_uInt32 nLockCount )
{
    assert( nLockCount > 0 );
    doAcquire( nLockCount );
}

inline sal_uInt32 SolarMutex::release( bool bUnlockAll )
{
     return doRelease( bUnlockAll );
}

}

#endif // INCLUDED_COMPHELPER_SOLARMUTEX_HXX

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