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
classCSharedCriticalSection {public:
CSharedCriticalSection() {
InitializeCriticalSection(&critical_section_);
}~CSharedCriticalSection() {
DeleteCriticalSection(&critical_section_);
}void lock() {
EnterCriticalSection(&critical_section_);
}voidunlock() {
LeaveCriticalSection(&critical_section_);
}private:
CRITICAL_SECTION critical_section_;
};classCSharedMutex {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();
}
}voidunlock() {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 boolis_lock_;
CSharedCriticalSection&critical_section_;
};