how can I make a queue thread safe? I need to push / pop / front / back and clear. is there something similar in boost?
I have one producer and one or more consumer.
std::queue
is not thread safe if one or more threads are writing. And its interface is not conducive to a thread safe implementation, because it has separate methods such as pop()
, size()
and empty()
which would have to be synchronized externally.
A common approach * is to implement a queue type with a simpler interface, and use locking mechanisms internally to provide synchronization.
* A search for "concurrent queue C++" should yield many results. I implemented a very simple toy one here , where the limitation was to use only standard C++. See also Anthony Williams' book C++ concurrency in action , as well as his blog.
You must protect access to std::queue
. If you are using boost protect it using boost::mutex
. Now if you have multiple readers and one writer thread look at boost::shared_lock
(for readers) and boost::unique_lock
(for writer).
However if you will encounter writer thread starvation look at boost::shared_mutex
.
在boost 1.53中有一个锁定队列http://www.boost.org/doc/libs/1_53_0/doc/html/boost/lockfree/queue.html ,没有这样的互斥或smth。
You have to protect it, eg with a std::mutex
, on every operation. Boost would be an alternative if you don't have C++11 yet.
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