boost - boost::lock_guard 与 boost::mutex::scoped_lock

Question

哪个是首选boost::lock_guard还是boost::mutex::scoped_lock？

我正在使用 Boost.Thread，希望在 C++11 线程可用时转移到它。

是scoped_lock下一个 c++ 标准的一部分吗？

偏爱一个比另一个有什么优势吗？

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注意：我知道这scoped_lock只是typedef.lock_guard

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编辑：我错了scoped_lock不是. 这是一个。typedeflock_guardtypedefunique_lock

Answer 1

Amit 是对的：boost::mutex::scoped_lock是typedeffor boost::unique_lock<boost::mutex>，不是lock_guard。scoped_lock在 C++0x 中不可用。

除非你需要灵活性，否则unique_lock我会使用lock_guard. 它更简单，更清楚地表达了将锁限制在定义范围内的意图。

Answer 2

Not much difference between the two. As per Boost, scoped_lock is a typedef for unique_lock<mutex>. Both of unique_lock and lock_guard implement RAII-style locking. The difference between is simply that unique_lock has a more complex interface -- it allows to defer lock and call unlock.