mutex、lock_guard 与 unique_lock | C++
本章覆盖：`std::mutex`；lock；unlock；critical section；`std::lock_guard`；RAII lock；`std::unique_lock`；deferred lock；lock ownership；手工 lock/unlock 的异常安全风险；临界区尽量短但首先保证正确。
本章知识点
std::mutex- lock
- unlock
- critical section
std::lock_guard- RAII lock
std::unique_lock- deferred lock
- lock ownership
- 手工 lock/unlock 的异常安全风险
- 临界区尽量短但首先保证正确