大家好，又见面了，我是你们的朋友全栈君。第二个例子（和第一个一样，没加注释，均是消费者需要判断生产者还在生产 吗），在实际中，可以考虑使用这个模型，比起我前面写的数据队列来说，用boost::lockfree可以大大减轻工作，这也是今年要努力掌握boost的一个理由
#include <boost/thread/thread.hpp>
#include <boost/lockfree/stack.hpp>
#include <iostream>
#include <boost/atomic.hpp>
boost::atomic_int producer_count(0);
boost::atomic_int consumer_count(0);
boost::lockfree::stack<int> stack(128);
const int iterations = 1000000;
const int producer_thread_count = 4;
const int consumer_thread_count = 4;
void producer(void)
{
for (int i = 0; i != iterations; ++i) {
int value = ++producer_count;
while (!stack.push(value))
;
}
}
boost::atomic<bool> done (false);
void consumer(void)
{
int value;
while (!done) {
while (stack.pop(value))
++consumer_count;
}
while (stack.pop(value))
++consumer_count;
}
int main(int argc, char* argv[])
{
using namespace std;
cout << "boost::lockfree::stack is ";
if (!stack.is_lock_free())
cout << "not ";
cout << "lockfree" << endl;
boost::thread_group producer_threads, consumer_threads;
for (int i = 0; i != producer_thread_count; ++i)
producer_threads.create_thread(producer);
for (int i = 0; i != consumer_thread_count; ++i)
consumer_threads.create_thread(consumer);
producer_threads.join_all();
done = true;
consumer_threads.join_all();
cout << "produced " << producer_count << " objects." << endl;
cout << "consumed " << consumer_count << " objects." << endl;
}
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