标签:blog io os div sp cti log on c
函数功能:初始化
函数原型:
void InitializeCriticalSection(LPCRITICAL_SECTIONlpCriticalSection);
函数说明:定义关键段变量后必须先初始化。
函数功能:销毁
函数原型:
void DeleteCriticalSection(LPCRITICAL_SECTIONlpCriticalSection);
函数说明:用完之后记得销毁。
函数功能:进入关键区域
函数原型:
void EnterCriticalSection(LPCRITICAL_SECTIONlpCriticalSection);
函数说明:系统保证各线程互斥的进入关键区域。
函数功能:离开关关键区域
函数原型:
void LeaveCriticalSection(LPCRITICAL_SECTIONlpCriticalSection);
输出将范文tickets设置为临界资源,由两个进程轮流访问
#include<stdio.h> #include<process.h> #include<windows.h> int tickets=50; CRITICAL_SECTION g_cs; unsigned int __stdcall Fun1(VOID *lp) { while(true) { Sleep(1);//这个要在临界区外面,不然要了资源切换了线程导致浪费 EnterCriticalSection(&g_cs); if(tickets>0) { printf("thread1 %d\n",tickets--); LeaveCriticalSection(&g_cs); } else { LeaveCriticalSection(&g_cs); break; } } return 0; } unsigned int __stdcall Fun2(VOID *lp) { while(true) { Sleep(1); EnterCriticalSection(&g_cs); if(tickets>0) { printf("thread2 %d\n",tickets--); LeaveCriticalSection(&g_cs); } else { LeaveCriticalSection(&g_cs); break; } } return 0; } int main() { InitializeCriticalSection(&g_cs);//初始化要在定义handle前面,不然调用了线程可能临界区并没有初始化 HANDLE handle1,handle2; handle1=(HANDLE)_beginthreadex(NULL,0,Fun1,NULL,0,NULL); handle2=(HANDLE)_beginthreadex(NULL,0,Fun2,NULL,0,NULL); CloseHandle(handle1); CloseHandle(handle2); Sleep(4000); DeleteCriticalSection(&g_cs); return 0; }
标签:blog io os div sp cti log on c
原文地址:http://www.cnblogs.com/zsboy/p/3981205.html