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RunGuard.cpp
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RunGuard.cpp
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#include "RunGuard.h"
#include <QCryptographicHash>
namespace {
QString generateKeyHash(const QString& key, const QString& salt)
{
QByteArray data;
data.append(key.toUtf8());
data.append(salt.toUtf8());
data = QCryptographicHash::hash(data, QCryptographicHash::Sha1).toHex();
return data;
}
}
RunGuard::RunGuard(const QString& key)
: key(key)
, memLockKey(generateKeyHash(key, "_memLockKey"))
, sharedMemKey(generateKeyHash(key, "_sharedmemKey"))
, sharedMemory(sharedMemKey)
, memLock(memLockKey, 1)
{
memLock.acquire();
{
QSharedMemory fix(sharedMemKey);
fix.attach();
}
memLock.release();
}
RunGuard::~RunGuard()
{
release();
}
bool RunGuard::isRunning()
{
if (sharedMemory.isAttached())
return false;
memLock.acquire();
const bool isRunning = sharedMemory.attach();
if (isRunning)
sharedMemory.detach();
memLock.release();
return isRunning;
}
bool RunGuard::tryToRun()
{
if (isRunning()) // Extra check
return false;
memLock.acquire();
const bool result = sharedMemory.create(sizeof(quint64));
memLock.release();
if (!result) {
release();
return false;
}
return true;
}
void RunGuard::release()
{
memLock.acquire();
if (sharedMemory.isAttached())
sharedMemory.detach();
memLock.release();
}