Semaphore C 11
suggest change#include <mutex>
#include <condition_variable>
class Semaphore {
public:
Semaphore (int count_ = 0)
: count(count_)
{
}
inline void notify( int tid ) {
std::unique_lock<std::mutex> lock(mtx);
count++;
cout << "thread " << tid << " notify" << endl;
//notify the waiting thread
cv.notify_one();
}
inline void wait( int tid ) {
std::unique_lock<std::mutex> lock(mtx);
while(count == 0) {
cout << "thread " << tid << " wait" << endl;
//wait on the mutex until notify is called
cv.wait(lock);
cout << "thread " << tid << " run" << endl;
}
count--;
}
private:
std::mutex mtx;
std::condition_variable cv;
int count;
};
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