题目:
有三个线程,线程1的功能就是向字符数组输出A,线程2的功能就是向字符数组输出B,线程2的功能就是向字符数组输出C,要求按顺序向数组赋值ABCABCABC,ABC的个数由线程函数1的参数指定。
接口说明:
void Init(); //初始化函数
void Release(); //资源释放函数
unsignedint__stdcall ThreadFun1(PVOID pM) ; //线程函数1,传入一个int类型的指针,用于初始化输出A次数,资源需要线程释放
unsignedint__stdcall ThreadFun2(PVOID pM) ;//线程函数2,无参数传入
unsignedint__stdcall ThreadFun3(PVOID pM) ;//线程函数3,无参数传入
char g_write[1024]; //线程1,线程2,线程3按到顺序向该数组赋值。不用考虑数组是否越界,测试用例保证
源代码:
#include <string.h> #include <stdlib.h> #include <stdio.h> #include <process.h> #include <windows.h> #define MAXHANDLE 3 char g_write[1028]; //线程1,线程2,线程3按到顺序向该数组赋值 HANDLE g_hThreadEvent[3]; HANDLE handle[MAXHANDLE]; int g_Number; //线程1函数 unsigned int __stdcall ThreadFun1(PVOID pM) { int uiNumber = *(int *)pM; int iLoop = 0; g_Number = uiNumber; for (iLoop; iLoop < uiNumber; iLoop++) { //printf("this is thread 1: %s\n", g_write); WaitForSingleObject(g_hThreadEvent[0], INFINITE); strcat(g_write, "A"); SetEvent(g_hThreadEvent[1]); } _endthreadex(0); return 0; } //线程2函数 unsigned int __stdcall ThreadFun2(PVOID pM) { int iLoop = 0; for (iLoop; iLoop < g_Number; iLoop++) { //printf("this is thread 2: %s\n", g_write); WaitForSingleObject(g_hThreadEvent[1], INFINITE); strcat(g_write, "B"); SetEvent(g_hThreadEvent[2]); } _endthreadex(0); return 0; } //线程3函数 unsigned int __stdcall ThreadFun3(PVOID pM) { int iLoop = 0; for (iLoop; iLoop < g_Number; iLoop++) { //printf("this is thread 2: %s\n", g_write); WaitForSingleObject(g_hThreadEvent[2], INFINITE); strcat(g_write, "C"); SetEvent(g_hThreadEvent[0]); } _endthreadex(0); return 0; } void Init(void) { g_hThreadEvent[0] = CreateEvent(NULL, FALSE, TRUE, NULL); g_hThreadEvent[1] = CreateEvent(NULL, FALSE, FALSE, NULL); g_hThreadEvent[2] = CreateEvent(NULL, FALSE, FALSE, NULL); memset(g_write, NULL, sizeof(g_write)); } void Release(void) { int iLoop = 0; for (int iLoop = 0; iLoop < MAXHANDLE; iLoop++) { CloseHandle(handle[iLoop]); } } int main( int Argc, char* Argv[]) { int uiNumber = 10; //需要重复打印的次数 int *num = NULL; Init(); num = (int*)malloc(sizeof(int)); *num = uiNumber; handle[0] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun1, num, 0, NULL); handle[1] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun2, NULL, 0, NULL); handle[2] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun3, NULL, 0, NULL); WaitForMultipleObjects(MAXHANDLE, handle, TRUE, INFINITE); Release(); printf("g_write = %s\n", g_write); system("pause"); return 0; }