multi threads

[weixj2003ld]

Hello,evry one.
When I create two threads and shared a class.In the class,I synchronize the method (with

QMutexLocker locker(&mutex);

QMutexLocker locker(&mutex);

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) used by the threads,I find that does not speed up the progress on the dual-core CPU.Does not synchronization speed up the progress in the multi-threads?

[weixj2003ld]

When Synchronizing the threads,I did as follows,Am I right or not?

Class A
{
public:
void  caculate()
{
QMutexLocker locker(&mutex);
  ....
}
public:
    mutable QMutex mutex;
}

Class A
{
public:
void  caculate()
{
QMutexLocker locker(&mutex);
  ....
}
public:
    mutable QMutex mutex;
}

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[weixj2003ld]

please answer my question.