[S60Ex]进程间同步控制方法

2009-06-23 23:43

从CS架构的示例代码中看到两种方式.

1. 信号量。来自S60Ex/ClientServerSync
//=================client process========
    RSemaphore semaphore;
    result = semaphore.CreateGlobal( KTimeServerSemaphoreName, 0 );
    if ( result != KErrNone )
        {
        return result;
        }

    result = CreateServerProcess();
    if ( result != KErrNone )
        {
        return result;
        }

    semaphore.Wait();
    semaphore.Close();
//===========server process========
    RSemaphore semaphore;
    User::LeaveIfError( semaphore.OpenGlobal( KTimeServerSemaphoreName ) );

    // Semaphore opened ok
    semaphore.Signal();
    semaphore.Close();


2. RProcess::Rendezvous 这个更简单
//============client process================
    TRequestStatus stat;
    server.Rendezvous(stat);
    if(stat != KRequestPending)
    {
        server.Kill(0);        // abort startup
    }
    else
    {
        server.Resume();    // logon OK - start the server
    }

    User::WaitForRequest(stat);        // wait for start or death
//===========server process========
    RProcess::Rendezvous(KErrNone);