多线程试炼--读者和作者问题

条件：5个读者，1个作者

方法：临界区critical_section、读写锁srwlock

#include<iostream>
#include <Windows.h>
#include <process.h>
using namespace std;

SRWLOCK srwlockThread;
CRITICAL_SECTION csThread_out;

unsigned int WINAPI ThreadReaderFunc(LPVOID lp)
{
	EnterCriticalSection(&csThread_out);
	cout << "The reader ID: " << GetCurrentThreadId() << " start waiting" << endl;
	LeaveCriticalSection(&csThread_out);

	AcquireSRWLockShared(&srwlockThread);
	EnterCriticalSection(&csThread_out);
	cout << "The reader ID: " << GetCurrentThreadId() << " start reading" << endl;
	LeaveCriticalSection(&csThread_out);
	Sleep(rand() % 100);
	EnterCriticalSection(&csThread_out);
	cout << "The reader ID: " << GetCurrentThreadId() << " end reading" << endl;
	LeaveCriticalSection(&csThread_out);
	ReleaseSRWLockShared(&srwlockThread);
	
	return 0;
}
unsigned int WINAPI ThreadWriterFunc(LPVOID lp)
{
	EnterCriticalSection(&csThread_out);
	cout << "The writer start waiting" << endl;
	LeaveCriticalSection(&csThread_out);

	AcquireSRWLockExclusive(&srwlockThread);
	EnterCriticalSection(&csThread_out);
	cout << "The writer start writing" << endl;
	LeaveCriticalSection(&csThread_out);
	Sleep(50);
	EnterCriticalSection(&csThread_out);
	cout << "The writer end writing" << endl;
	LeaveCriticalSection(&csThread_out);
	ReleaseSRWLockExclusive(&srwlockThread);

	return 0;
}

int main(int argc, char *argv[])
{
	InitializeSRWLock(&srwlockThread);
	InitializeCriticalSection(&csThread_out);
	const int thread_Num = 6;
	HANDLE hThread[thread_Num];
	hThread[0] = (HANDLE)_beginthreadex(nullptr, 0, ThreadWriterFunc, nullptr, 0, nullptr);
	for (int i = 1; i < thread_Num; i++)
	{
		hThread[i] = (HANDLE)_beginthreadex(nullptr, 0, ThreadReaderFunc, nullptr, 0, nullptr);
	}
	WaitForMultipleObjects(thread_Num, hThread, true, INFINITE);

	for (int i = 0; i < thread_Num; i++)
	{
		CloseHandle(hThread[i]);
	}
	DeleteCriticalSection(&csThread_out);
	system("pause");
	return 0;
}