void CTestSemaphoreApp::Consume(int Num)
{
for (int i = Num; i > 0; --i ) {
// we can only consume one by one
s_semContent.Wait();
s_semStorage.Wait();
--s_Counter;
NcbiCout << "-1=" << s_Counter << NcbiEndl;
s_semStorage.Post();
SleepMilliSec(500);
}
}
void CTestSemaphoreApp::Produce(int Num)
{
// Storage semaphore acts as a kind of mutex - its only purpose
// is to protect Counter
s_semStorage.Wait();
s_Counter += Num;
NcbiCout << "+" << Num << "=" << s_Counter << NcbiEndl;
s_semStorage.Post();
// Content semaphore notifies consumer threads of how many items can be
// consumed. Slow consumption with fast production causes Content semaphore
// to overflow from time to time. We catch exception and wait for consumers
// to consume something
for (bool Posted=false; !Posted;) {
try {
s_semContent.Post(Num);
Posted = true;
}
catch (exception& e) {
NcbiCout << e.what() << NcbiEndl;
SleepMilliSec(500);
}
}
}
