其他形式的同步
我们可使用类Monitor与类Thread中的某些函数,直接控制线程的同步,请看例1。
例1:
using namespace System;
using namespace System::Threading;
int main()
{
/*1*/ MessageBuffer^ m = gcnew MessageBuffer;
/*2a*/ ProcessMessages^ pm = gcnew ProcessMessages(m);
/*2b*/ Thread^ pmt = gcnew Thread(gcnew ThreadStart(pm,&ProcessMessages::ProcessMessagesEntryPoint));
/*2c*/ pmt->Start();
/*3a*/ CreateMessages^ cm = gcnew CreateMessages(m);
/*3b*/ Thread^ cmt = gcnew Thread(gcnew ThreadStart(cm, &CreateMessages::CreateMessagesEntryPoint));
/*3c*/ cmt->Start();
/*4*/ cmt->Join();
/*5*/ pmt->Interrupt();
/*6*/ pmt->Join();
Console::WriteLine("Primary thread terminating");
}
public ref class MessageBuffer
{
String^ messageText;
public:
void SetMessage(String^ s)
{
/*7*/ Monitor::Enter(this);
messageText = s;
/*8*/ Monitor::Pulse(this);
Console::WriteLine("Set new message {0}", messageText);
Monitor::Exit(this);
}
void ProcessMessages()
{
/*9*/ Monitor::Enter(this);
while (true)
{
try
{
/*10*/ Monitor::Wait(this);
}
catch (ThreadInterruptedException^ e)
{
Console::WriteLine("ProcessMessage interrupted");
return;
}
Console::WriteLine("Processed new message {0}", messageText);
}
Monitor::Exit(this);
}
};
public ref class CreateMessages
{
MessageBuffer^ msg;
public:
CreateMessages(MessageBuffer^ m)
{
msg = m;
}
void CreateMessagesEntryPoint()
{
for (int i = 1; i <= 5; ++i)
{
msg->SetMessage(String::Concat("M-", i.ToString()));
Thread::Sleep(2000);
}
Console::WriteLine("CreateMessages thread terminating");
}
};
public ref class ProcessMessages
{
MessageBuffer^ msg;
public:
ProcessMessages(MessageBuffer^ m)
{
msg = m;
}
void ProcessMessagesEntryPoint()
{
msg->ProcessMessages();
Console::WriteLine("ProcessMessages thread terminating");
}
};