boost多线程编程条件变量

#include <boost/thread/thread.hpp>#include <boost/thread/mutex.hpp>#include <boost/thread/condition.hpp>#include <iostream>const int BUF_SIZE = 10;const int ITERS = 100;boost::mutex io_mutex;class buffer{public:typedef boost::mutex::scoped_lockscoped_lock;buffer(): p(0), c(0), full(0){}void put(int m){scoped_lock lock(mutex);if (full == BUF_SIZE){{boost::mutex::scoped_locklock(io_mutex);std::cout <<"Buffer is full. Waiting..."<< std::endl;}while (full == BUF_SIZE)cond.wait(lock);}buf[p] = m;p = (p + 1) % BUF_SIZE;++full;cond.notify_one();}int get(){scoped_lock lk(mutex);if (full == 0){{boost::mutex::scoped_locklock(io_mutex);std::cout <<"Buffer is empty. Waiting..."<< std::endl;}while (full == 0)cond.wait(lk);}int i = buf[c];c = (c + 1) % BUF_SIZE;--full;cond.notify_one();return i;}private:boost::mutex mutex;boost::condition cond;unsigned int p, c, full;int buf[BUF_SIZE];};buffer buf;void writer(){for (int n = 0; n < ITERS; ++n){{boost::mutex::scoped_locklock(io_mutex);std::cout << "sending: "<< n << std::endl;}buf.put(n);}}void reader(){for (int x = 0; x < ITERS; ++x){int n = buf.get();{boost::mutex::scoped_locklock(io_mutex);std::cout << "received: "<< n << std::endl;}}}int main(int argc, char* argv[]){boost::thread thrd1(&reader);boost::thread thrd2(&writer);thrd1.join();thrd2.join();return 0;}