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#include "qsystemsemaphore.h"

#include "qsystemsemaphore_p.h"

#include "qcoreapplication.h"

#include <qdebug.h>

#include <qcore_symbian_p.h>

#include <e32cmn.h>

QT_BEGIN_NAMESPACE

#ifndef QT_NO_SYSTEMSEMAPHORE

QSystemSemaphorePrivate::QSystemSemaphorePrivate() :

        error(QSystemSemaphore::NoError)

{

}

void QSystemSemaphorePrivate::setErrorString(const QString &function, int err)

{

    if (err == KErrNone){

        return;

    }

    switch(err){

    case KErrAlreadyExists:

        errorString = QCoreApplication::tr("%1: already exists", "QSystemSemaphore").arg(function);

        error = QSystemSemaphore::AlreadyExists;

    break;

    case KErrNotFound:

        errorString = QCoreApplication::tr("%1: does not exist", "QSystemSemaphore").arg(function);

        error = QSystemSemaphore::NotFound;

    break;

    case KErrNoMemory:

    case KErrInUse:

        errorString = QCoreApplication::tr("%1: out of resources", "QSystemSemaphore").arg(function);

        error = QSystemSemaphore::OutOfResources;

    break;

default:

    errorString = QCoreApplication::tr("%1: unknown error %2", "QSystemSemaphore").arg(function).arg(err);

    error = QSystemSemaphore::UnknownError;

    }

#if defined QSYSTEMSEMAPHORE_DEBUG

        qDebug() << errorString << "key" << key;

#endif

}

int QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode)

{

    // don't allow making handles on empty keys

    if (key.isEmpty())

        return 0;

    QString safeName = makeKeyFileName();

    TPtrC name(qt_QString2TPtrC(safeName));

    int err;

    err = semaphore.OpenGlobal(name,EOwnerProcess);

    if (err == KErrNotFound){

        err = semaphore.CreateGlobal(name,initialValue, EOwnerProcess);

    }

    if (err){

        setErrorString(QLatin1String("QSystemSemaphore::handle"),err);

        return 0;

    }

    return semaphore.Handle();

}

void QSystemSemaphorePrivate::cleanHandle()

{

    semaphore.Close();

}

bool QSystemSemaphorePrivate::modifySemaphore(int count)

{

    if (0 == handle())

        return false;

    if (count > 0) {

        semaphore.Signal(count);

    } else {

        semaphore.Wait();

        }

    return true;

}

#endif //QT_NO_SYSTEMSEMAPHORE

QT_END_NAMESPACE