临界区访问的两个类:临界区类,共享临界区类
CSharedCriticalSection 实现临界区的访问:加锁、去锁
CSharedMutex 实现临时窃取临界区对象,然后加锁,对象销毁时又会去锁,然后归还对象
class CSharedCriticalSection { public: CSharedCriticalSection() { InitializeCriticalSection(&critical_section_); } ~CSharedCriticalSection() { DeleteCriticalSection(&critical_section_); } void lock() { EnterCriticalSection(&critical_section_); } void unlock() { LeaveCriticalSection(&critical_section_); } private: CRITICAL_SECTION critical_section_; }; class CSharedMutex { public: explicit CSharedMutex(CSharedCriticalSection& critical_section) : is_lock_(false) , critical_section_(critical_section) { if(is_lock_ == false) { is_lock_ = true; critical_section_.lock(); } } ~CSharedMutex(){ if(is_lock_) { is_lock_ = false; critical_section_.unlock(); } } void lock() { if(is_lock_ == false) { is_lock_ = true; critical_section_.lock(); } } void unlock() { if(is_lock_) { is_lock_ = false; critical_section_.unlock(); } } protected: CSharedMutex(const CSharedMutex& rhs) : critical_section_(rhs.critical_section_) { } CSharedMutex& operator=(const CSharedMutex& rhs) { return *this; } private: volatile bool is_lock_; CSharedCriticalSection& critical_section_; };
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