CriticalSection vs Mutex

1. CriticalSection不需要进入内核就可以使用，速度比Mutex快100倍。

2. CriticalSection只能用于同一个进程，而Mutex可以被不同进程使用

 

CriticalSection的伪代码

CRITICAL_SECTION s;

void EnterCriticalSection( CRITICAL_SECTION* s )
{
    int spin_count = s.max_count;
    while( --spin_count >= 0 )
    {
        if( InterlockedExchange( &s->Locked, 1 ) == 1 )
        {
           // we own the lock now
           s->OwningThread = GetCurrentThread();
           return;
        }
    }
    // lock the mutex and wait for an unlock
    WaitForSingleObject( &s->KernelLock, INFINITE );
}