New read-write lock function for Windows Vista

Windows Vista and the updated Windows client system, Windows Server 2008 and the updated Windows Server system, added read-write lock API functions, and we no longer have to write read-write locks manually.

To use a read-write lock, of course, include the Windows header file and define a variable of type srwlock (struct):

SRWLOCK Lock;

A variable of type Srwlock cannot be assigned manually, cannot take the value of the field in it, and cannot copy the memory it occupies with a function such as memcpy, and all its operations (initialization, read lock, write lock, etc.) can only be carried out by the relevant function.

The function that initializes the read-write lock is Initializesrwlock, using the following:

Initializesrwlock (&lock);

The parameter type is srwlock*, and the address of the lock you just defined is passed in the past.

The function that is locked for the read operation is acquiresrwlockshared:

Acquiresrwlockshared (&Lock;

The function to unlock for the read operation is releasesrwlockshared:

Releasesrwlockshared (&lock)

The function that is locked for the write operation is acquiresrwlockexclusive:

Acquiresrwlockexclusive (&lock);

The function that is locked for the write operation is releasesrwlockexclusive:

Releasesrwlockexclusive (&lock);

Read-write locks do not need to be deleted manually.

For convenience, I usually encapsulate the read-write lock and its related functions into a class, thus achieving the "out of the box" effect.

Header file srw.h//required://#include <windows.h>class Rwmutex{public:rwmutex ();    ~rwmutex () = default;    void Rlock ();    void Runlock ();    void Lock ();    void Unlock ();p rivate:srwlock Lock_;private:rwmutex (const rwmutex&) = delete; void operator= (const rwmutex&) = delete;};

Overloaded assignment notation, which returns void instead of Rwmutex&, which is actually more reasonable.

Source file Srw.cpprwmutex::rwmutex () {:: Initializesrwlock (&lock_);} void Rwmutex::rlock () {:: Acquiresrwlockshared (&lock_);} void Rwmutex::runlock () {:: Releasesrwlockshared (&lock_);} void Rwmutex::lock () {:: Acquiresrwlockexclusive (&lock_);} void Rwmutex::unlock () {:: Releasesrwlockexclusive (&lock_);}

New read-write lock function for Windows Vista