以下用于有界线程安全队列的代码用于在Boost 1.49中按预期工作。但是,在更新到Boost 1.54之后,代码不再按预期运行。也就是说,当缓冲区为空(完整)时,消费者线程(生产者线程)将永远等待m_not_empty(m_not_full)条件变量并且永远不会唤醒(我认为因为生产者线程没有互斥锁)。
版本1.54中是否有一些可能会破坏代码的更改?或者,也许,我错过了代码中的错误?
#include <iostream>
#include <boost/circular_buffer.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>
#include <boost/thread/thread.hpp>
template <class T>
class bounded_buffer {
public:
bounded_buffer(size_t capacity) {cb.set_capacity(capacity);}
void push(T item) {
boost::mutex::scoped_lock lock(m_mutex);
while (cb.full()) {
m_not_full.wait(lock);
}
cb.push_back(item);
lock.unlock();
m_not_empty.notify_one();
}
void pop(T &pItem) {
boost::mutex::scoped_lock lock(m_mutex);
while (cb.empty()) {
m_not_empty.wait(lock);
}
pItem = cb.front();
cb.pop_front();
lock.unlock();
m_not_full.notify_one();
}
private:
boost::mutex m_mutex;
boost::condition m_not_empty;
boost::condition m_not_full;
boost::circular_buffer<T> cb;
};
bounded_buffer<int> bb_int(4);
void producer() {
int i = 10;
for(int j=0; j<100; ++j) {
bb_int.push(i);
std::cout << "producer: " << i << std::endl;
i++;
}
}
void consumer() {
int i;
for(int j=0; j<100; ++j) {
bb_int.pop(i);
std::cout << "consumer: " << i << std::endl;
}
}
// Test code
int main() {
// Start the threads.
boost::thread consume(consumer);
boost::thread produce(producer);
// Wait for completion.
consume.join();
produce.join();
}
答案 0 :(得分:2)
好的,我发现了一个错误。我在发布版本中编译了代码,但链接到.lib文件的调试版本。基本上,在发布版本I中我链接到boost_thread-vc100-mt-gd-1_54.lib
,但它应该链接到boost_thread-vc100-mt-1_54.lib
。