C: use of mutex

1. The mutex lock

 Definition ：
private static readonly object m_objLock = new object();
 
 Use ：
lock (m_objLock)
{
　　// todo
}
 effect ： Will lock the contents of the code block , And prevent other threads from entering the code block , Until the code block is completed , Release the lock .

Be careful ： The defined lock object should be ： private + static state + read-only + Object of reference type , This prevents external changes to the lock object .

2. The mutex Monitor

 Definition ：
private static readonly object m_objLock = new object();
 Use ：
Monitor.Enter(m_objLock);
//todo
Monitor.Exit(m_objLock);
 effect ： Will lock the contents of the code block , And prevent other threads from entering the code block , Until the code block is completed , Release the lock .

Be careful ： Be careful ： The defined lock object should be ： private + static state + read-only + Object of reference type , This prevents external changes to the lock object .

Monitor Yes TryEnter The function of , It can prevent deadlock problems ,lock No, .

3. The mutex Mutex

 Definition ：
private static readonly Mutex mutex = new Mutex();
 Use ：
mutex.WaitOne();
//todo
mutex.ReleaseMutex();
 effect ： Will lock the contents of the code block , And prevent other threads from entering the code block , Until the code block is completed , Release the lock .

Be careful ： Be careful ： The defined lock object should be ： private + static state + read-only + Object of reference type , This prevents external changes to the lock object .

Mutex It can be system level , So it can span the process .