examples/Base/IPC/condvar/condvarlocal/src/condvarlocal.cpp

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Description:
Contains the E32Main() function, which executes the example.
The example demonstrates the use of local condition variable IPC mechanism. The threads created in the process use this condition variable to co-operate with each other.
The example performs the following tasks:
- create an object of the CQueue class, which in turn crates a queue of integer tokens
- create an object of the CProducer class, which in turn creates the producer thread
- create an object of the CConsumer class, which in turn creates the consumer thread
- create an object of the CUserInterface class ,which accepts asynchronous key press events from the console.
The CUserInterface class provides an interface for the user to interact with the threads created in the example.
The CQueue::iCondVar is the local condition varaibale that is used by the two threads to co-operate with each other.  
*/



#include "globals.h"
#include "queue.h"
#include "producer.h"
#include "consumer.h"
#include "userinterface.h"

LOCAL_D CConsoleBase* console;
LOCAL_C void DoExampleL();
LOCAL_C void callExampleL();

LOCAL_C void DoExampleL()
        {
        CActiveScheduler* scheduler = new (ELeave) CActiveScheduler();
        CleanupStack::PushL(scheduler);
        CActiveScheduler::Install(scheduler);

        // Create an object of the CQueue class.
        CQueue* tokens = CQueue::NewL();
        CleanupStack::PushL(tokens);

        // Print the KTextInvokeProducer string and wait for a key press.
        _LIT(KTextInvokeProducer,"Creating and starting the Producer Thread...[This produces a token every two seconds]\n");
        console->Printf(KTextInvokeProducer);
        _LIT(KTxtPressAnyKeyToContinue,"[press any key to continue]\n");
        console->Printf(KTxtPressAnyKeyToContinue);
        console->Getch();
        // Create an object of the CProducer class.
        CProducer* prod = CProducer::NewL(console,tokens);
        CleanupStack::PushL(prod);

        // Print the KTextInvokeConsumer string and wait for a key press.
        _LIT(KTextInvokeConsumer,"Creating and starting the Consumer Thread...[This consumes a token every second]\n");
        console->Printf(KTextInvokeConsumer);
        console->Printf(KTxtPressAnyKeyToContinue);
        console->Getch();

        // Create an object of the CConsumer class.
        CConsumer* cons = CConsumer::NewL(console,tokens);
        CleanupStack::PushL(cons);

        // Create an object of the CUserInterface class.
        // This handles key press requests from the console.
        CUserInterface* ui = CUserInterface::NewL(console,prod);
        CleanupStack::PushL(ui);
        
        _LIT(KTextStartAS,"Starting the active scheduler...\n");
        console->Printf(KTextStartAS);
        // Issue an asynchronous read request.
        ui->ReadFunc();
        // Start the active scheduler.
        CActiveScheduler::Start();

        CleanupStack::PopAndDestroy(5,scheduler);
        }

GLDEF_C TInt E32Main()
    {
        __UHEAP_MARK;
        CTrapCleanup* cleanup=CTrapCleanup::New();
        TRAPD(error,callExampleL());
        delete cleanup;
        __ASSERT_ALWAYS(!error,User::Panic(KTxtEPOC32EX,error));
        __UHEAP_MARKEND;
        return 0;
    }

LOCAL_C void callExampleL()
    {
        console=Console::NewL(KTxtExampleCode,TSize(KConsFullScreen,KConsFullScreen));
        CleanupStack::PushL(console);
        TRAPD(error,DoExampleL());
        if (error)
                console->Printf(KFormatFailed, error);
        else
                console->Printf(KTxtOK);
        console->Printf(KTxtPressAnyKey);
        console->Getch();
        CleanupStack::PopAndDestroy();
    }

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