SDL事件处理以及线程使用（2）

事件使用

#include <stdio.h>
#include <SDL.h>#define FF_QUIT_EVENT (SDL_USEREVENT + 1)       // 定义自定义事件#undef main
int main()
{SDL_Window* pWindow = NULL;SDL_Init(SDL_INIT_VIDEO);// 创建窗口pWindow = SDL_CreateWindow("Event Test Title",SDL_WINDOWPOS_UNDEFINED,SDL_WINDOWPOS_UNDEFINED,640,480,SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);if(NULL == pWindow){printf("Create window error: %s\n", SDL_GetError());return -1;}SDL_Event event;int is_exit = 1;while(is_exit){SDL_WaitEvent(&event);switch (event.type)             // 区分鼠标事件、键盘事件{case SDL_KEYDOWN:               // 键盘按下事件switch (event.key.keysym.sym){case SDLK_a:break;case SDLK_s:break;case SDLK_d:break;case SDLK_w:break;case SDLK_q:{SDL_Event myEvent;              // 自定义事件并发送myEvent.type = FF_QUIT_EVENT;SDL_PushEvent(&myEvent);break;}}break;case SDL_MOUSEBUTTONDOWN:           // 鼠标按键按下事件switch(event.button.button){case SDL_BUTTON_LEFT:printf("mouse button left down\n");break;case SDL_BUTTON_RIGHT:printf("mouse button right down\n");break;}break;case SDL_MOUSEMOTION:           // 鼠标移动事件printf("mouse move {%d, %d}\n", event.button.x, event.button.y);break;case FF_QUIT_EVENT:             // 自定义事件printf("myself event is triggered\n");is_exit = 0;break;}}// 销毁窗口，释放资源if(pWindow)SDL_DestroyWindow(pWindow);SDL_Quit();return 0;
}

线程使用

#include <SDL.h>
#include <stdio.h>int n = 0;
// 线程处理函数
int thread_work(void* arg)
{printf("enter thread arg: %d\n", *((int*)arg));for(int i = 0; i < 500000; i++){n++;}return 0;
}#undef main
int main()
{int thread_num = 520;// 创建线程SDL_Thread* thread1 = SDL_CreateThread(thread_work, "thread1Name", &thread_num);if(NULL == thread1){printf("thread1 create error %s\n", SDL_GetError());return -1;}thread_num++;SDL_Thread* thread2 = SDL_CreateThread(thread_work, "thread2Name", &thread_num);if(NULL == thread2){printf("thread2 create error: %s\n", SDL_GetError());return -1;}// 等待线程汇入主线程SDL_WaitThread(thread1, NULL);SDL_WaitThread(thread2, NULL);printf("n is value: %d\n", n);return 0;
}

互斥锁使用

#include <SDL.h>
#include <stdio.h>/// 互斥锁 ///
SDL_mutex* mutex = NULL;
/int n = 0;
// 线程处理函数
int thread_work(void* arg)
{printf("enter thread arg: %d\n", *((int*)arg));/// 上锁 ///SDL_LockMutex(mutex);/for(int i = 0; i < 500000; i++){n++;}/// 解锁 ///SDL_UnlockMutex(mutex);/return 0;
}#undef main
int main()
{/// 创建互斥锁 ///mutex = SDL_CreateMutex();if(NULL == mutex){printf("Create mutex error: %s\n", SDL_GetError());return -1;}/int thread_num = 520;// 创建线程SDL_Thread* thread1 = SDL_CreateThread(thread_work, "thread1Name", &thread_num);if(NULL == thread1){printf("thread1 create error %s\n", SDL_GetError());return -1;}thread_num++;SDL_Thread* thread2 = SDL_CreateThread(thread_work, "thread2Name", &thread_num);if(NULL == thread2){printf("thread2 create error: %s\n", SDL_GetError());return -1;}// 等待线程汇入主线程SDL_WaitThread(thread1, NULL);SDL_WaitThread(thread2, NULL);printf("n is value: %d\n", n);/// 释放锁资源 ///SDL_DestroyMutex(mutex);/return 0;
}

条件变量使用

#include <SDL.h>
#include <stdio.h>SDL_mutex* g_mutex = NULL;  // 互斥锁
SDL_cond*  g_cond = NULL;   // 条件变量// 线程等待函数
int thread_waitFunc(void* arg)
{printf("thread %d wait......\n", *(int*)arg);SDL_LockMutex(g_mutex);SDL_CondWait(g_cond, g_mutex);SDL_UnlockMutex(g_mutex);printf("thread wait end, start work......\n");return 1;
}// 线程发送信号函数
int thread_signFunc(void* arg)
{printf("thread %d sleep 5s\n", *(int*)arg);sleep(5);                   // 5秒后唤醒等待的线程SDL_CondSignal(g_cond);     // 唤醒等待的线程printf("thread %d send signal success\n", *(int*)arg);return 666;
}#undef main
int main()
{// 创建互斥锁和条件变量g_mutex = SDL_CreateMutex();g_cond  = SDL_CreateCond();if(g_mutex == NULL || g_cond == NULL){printf("Create mutex or cond failed: %s\n", SDL_GetError());return -1;}// 创建线程int wait_num = 1001;SDL_Thread* thread_wait = SDL_CreateThread(thread_waitFunc, "threadWait", &wait_num);if(NULL == thread_wait){printf("create threadWait error: %s\n", SDL_GetError());return -1;}wait_num++;SDL_Thread* thread_sign = SDL_CreateThread(thread_signFunc, "threadSignal", &wait_num);if(NULL == thread_sign){printf("create threadSign error: %s\n", SDL_GetError());SDL_CondSignal(g_cond);SDL_WaitThread(thread_wait, NULL);return -1;}// 将两个线程汇入主线程SDL_WaitThread(thread_wait, NULL);SDL_WaitThread(thread_sign, NULL);// 释放锁跟条件变量的资源SDL_DestroyMutex(g_mutex);SDL_DestroyCond(g_cond);return 0;
}