轻量级读写锁(SRW)

看了 MoreWindows 的Blog, 自己实践了下, 写写总结, 记录下。并在此谢谢那些无私的大牛们 Orz

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最近都在看线程同步、互斥相关内容, 今天写的是 轻量级读写锁(SRW)

SRW 的特点->MSDN 地址 http://msdn.microsoft.com/en-us/library/aa904937(v=vs.85).aspx

直接戳函数名到 MSDN 去看原型 - -.

AcquireSRWLockExclusive	Acquires an SRW lock in exclusive mode. 获取独占模式的SRW锁（阻塞）
AcquireSRWLockShared	Acquires an SRW lock in shared mode. 获取共享模式的SRW锁（阻塞）
InitializeSRWLock	Initialize an SRW lock.. 初始化
ReleaseSRWLockExclusive	Releases an SRW lock that was opened in exclusive mode. 释放独占模式打开了一个SRW锁
ReleaseSRWLockShared	Releases an SRW lock that was opened in shared mode. 释放共享模式打开了一个SRW锁
SleepConditionVariableSRW	Sleeps on the specified condition variable and releases the specified lock as an atomic operation.
TryAcquireSRWLockExclusive	Attempts to acquire a slim reader/writer (SRW) lock in exclusive mode. If the call is successful, the calling thread takes ownership of the lock. 获取独占模式的SRW锁（非阻塞）成功/失败非零/零
TryAcquireSRWLockShared	Attempts to acquire a slim reader/writer (SRW) lock in shared mode. If the call is successful, the calling thread takes ownership of the lock. 获取共享模式的SRW锁（非阻塞）成功/失败非零/零

所以SRW的特点就是：所有读线程可以并发的执行（获得共享锁），而一旦写线程获得执行（获得独占锁）其他读、写线程全部都无法获得锁（共享锁、独占锁）。

注意点：

1.程序在codeblocks下无法编译，VS2008通过，系统windows 7 32bit

2. MoreWindows 在他的blog中提到系统要求在 Vista 或 Windows Server2008之上

下面是我的测试程序和说明：

#include <iostream>
#include <windows.h>
#include <process.h>
#include <time.h>using namespace std;SRWLOCK RW_lock;
int couter = 0;unsigned int __stdcall func_1(void*)
{while (1){AcquireSRWLockExclusive(&RW_lock);cout << "Write thread func_1 is running .. " << endl;cout << couter ++ << endl;Sleep(2000);cout << "Write thread func_1 has exited .. " << endl;ReleaseSRWLockExclusive(&RW_lock);Sleep(1000);}return 0;
}unsigned int __stdcall func_2(void*)
{while (1){AcquireSRWLockExclusive(&RW_lock);cout << "   Write thread func_2 is running .. " << endl;cout << "   " << couter ++ << endl;Sleep(1000);cout << "   Write thread func_2 has exited .. " << endl;ReleaseSRWLockExclusive(&RW_lock);Sleep(2000);}return 0;
}/// In the thread, if read operation is to acquire the lock, and don't read operation outside of the things.
unsigned int __stdcall func_3(void*){while (1){AcquireSRWLockShared(&RW_lock);cout << "Read thread func_3 is running .. " << endl;cout << couter << endl;Sleep(3000);cout << "Read thread func_3 has exited .. " << endl;ReleaseSRWLockShared(&RW_lock);Sleep(4000);}return 0;
}unsigned int __stdcall func_4(void*)
{while (1){AcquireSRWLockShared(&RW_lock);cout << "   Read thread func_4 is running .. " << endl;cout << "   " << couter << endl;Sleep(3000);cout << "   Read thread func_4 has exited .. " << endl;ReleaseSRWLockShared(&RW_lock);Sleep(4000);}
}int main()
{InitializeSRWLock(&RW_lock);HANDLE pid[5];pid[0] = (HANDLE)_beginthreadex(NULL, 0, func_1, NULL, 0, NULL);pid[1] = (HANDLE)_beginthreadex(NULL, 0, func_2, NULL, 0, NULL);pid[2] = (HANDLE)_beginthreadex(NULL, 0, func_3, NULL, 0, NULL);pid[3] = (HANDLE)_beginthreadex(NULL, 0, func_4, NULL, 0, NULL);WaitForMultipleObjects(4, pid, true, INFINITE);for (int i=0; i<4; i++){CloseHandle(pid[i]);}system("pause");return 0;
}

运行结果与说明：

再次感谢无私的前辈！！

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