C-多线程读写同步
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网易公开课,多线程读写同步,VS2010控制台程序:
// testVC.cpp : 读写同步实现。
//
//
#include "stdafx.h"
#define BUFFLENGTH 8
char buffer[BUFFLENGTH];
HANDLE hSemaphoreEmpty;
HANDLE hSemaphoreFull;
DWORD _stdcall Reader(LPVOID lpParameter);
DWORD _stdcall Writer(LPVOID lpParameter);
char buffer[BUFFLENGTH];
HANDLE hSemaphoreEmpty;
HANDLE hSemaphoreFull;
DWORD _stdcall Reader(LPVOID lpParameter);
DWORD _stdcall Writer(LPVOID lpParameter);
int main(int argc, char* argv[])
{
HANDLE handle[2];
hSemaphoreEmpty = CreateSemaphore(NULL, 8, 8, NULL);
hSemaphoreFull = CreateSemaphore(NULL, 0, 8, NULL);
handle[0] = CreateThread(NULL,0,Writer,NULL, 0, NULL);
handle[1] = CreateThread(NULL,0,Reader,NULL, 0, NULL);
{
HANDLE handle[2];
hSemaphoreEmpty = CreateSemaphore(NULL, 8, 8, NULL);
hSemaphoreFull = CreateSemaphore(NULL, 0, 8, NULL);
handle[0] = CreateThread(NULL,0,Writer,NULL, 0, NULL);
handle[1] = CreateThread(NULL,0,Reader,NULL, 0, NULL);
WaitForMultipleObjects(2,handle,TRUE,INFINITE);
return 0;
}
return 0;
}
DWORD _stdcall Writer(LPVOID lpParameter)
{
char str[41];
{
char str[41];
for(int i=0;i<40;i++){
str[i] = 'A' + rand() % 26;
str[i] = 'A' + rand() % 26;
WaitForSingleObject(hSemaphoreEmpty, INFINITE);
buffer[i%BUFFLENGTH] = str[i];
ReleaseSemaphore(hSemaphoreFull, 1, NULL);
}
str[40] = '\0';
printf("Writer:%s\n",str);
buffer[i%BUFFLENGTH] = str[i];
ReleaseSemaphore(hSemaphoreFull, 1, NULL);
}
str[40] = '\0';
printf("Writer:%s\n",str);
return 0;
}
DWORD _stdcall Reader(LPVOID lpParameter)
{
char str[41];
}
DWORD _stdcall Reader(LPVOID lpParameter)
{
char str[41];
for(int i=0;i<40;i++){
WaitForSingleObject(hSemaphoreFull, INFINITE);
str[i] = buffer[i%BUFFLENGTH];
ReleaseSemaphore(hSemaphoreEmpty, 1, NULL);
}
str[40] = '\0';
printf("Reader:%s\n",str);
WaitForSingleObject(hSemaphoreFull, INFINITE);
str[i] = buffer[i%BUFFLENGTH];
ReleaseSemaphore(hSemaphoreEmpty, 1, NULL);
}
str[40] = '\0';
printf("Reader:%s\n",str);
return 0;
}
}
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