pthread使用实例

来源：互联网发布：理财软件安全吗编辑：程序博客网时间：2024/06/05 06:43

在cocos2d-x里面用多线程还是乖乖的用pthread吧。应用一启动时创建线程作为逻辑线程。

创建方法如下：

extern ResourcePool logicThreadResource;void *test(void *param){    while (true) {        if (logicThreadResource.peekNextDataLength()) {            printf("有数据需要处理");            int datasize = 0;            char *receiveData = new char[512];            logicThreadResource.popData(receiveData, datasize, 512);                        int sigal = *((int32_t *) receiveData);            printf("the sigal is %d\n", sigal);            if (sigal == 100) {                CalWinRate(receiveData+4);            }            delete[] receiveData;                    }else{            pthread_mutex_lock(&locklogicthread);            pthread_cond_wait(&cond, &locklogicthread);            pthread_mutex_unlock(&locklogicthread);        }    }        return NULL;}void create_pthread(){    //    启动两个测试的主线程    pthread_t tid;    pthread_create(&tid, NULL, test, NULL);}

pthread_create原型为:PTW32_DLLPORT int PTW32_CDECL pthread_create(pthread_t *tid, const pthread_attr_t *attr, void*(*start)(void *), void *arg)。create有四个参数，第一个是pthread_t，第二个是创建线程的参数，第三个是线程的入口函数，第四个为入口函数参数。这里需要注意的是设置pthread_cond_wait即唤醒函数的时候一定要加锁。启动函数如下：

bool ResourcePool::pushData(const char *data, int size){    AutoReleaseLock myLock = AutoReleaseLock();//    deal    int realSize = size + sizeof(int32_t);    int needMemory = bufferLength + realSize;    if (needMemory > bufferCapacity) {//        需要重新分配内存        if (reMollocMemory(needMemory)) {        }else{            return false;        }    }//    char *pWriteBuff = resPool + bufferLength;        *((int32_t *)pWriteBuff) = size;        pWriteBuff += sizeof(int32_t);    bufferLength += sizeof(int32_t);        memmove(pWriteBuff, data, size);    bufferLength += size;    //    缓冲区有数据的话就激活线程    pthread_cond_signal(&cond);        return true;}

思路还是采用的是我上篇博客的思路，至于cocos2d-x里面的调用我是这样的：

local handlerlocal scheduler = CCDirector:sharedDirector():getScheduler()handler = scheduler:scheduleScriptFunc(function()                                -- 每帧检测一下数据，看看是否是合理的                                BookUtils:parsePackageToLua()                                if GLOABLEPACKAGE ~= "" then                                    -- 解析数据                                    local package = json.decode(GLOABLEPACKAGE)                                    print("the GLOABLEPACKAGE is " .. GLOABLEPACKAGE)                                    GLOABLEPACKAGE = ""                                    local dataTable = {}                                    table.walk(package, function(val, key)                                            if tonumber(key) ~= 1 then                                                dataTable[#dataTable+1] = val                                               end                                        end)                                                                        if tonumber(package[1]) == 100 then                                        -- 胜率计算器，更新胜率                                        CCNotificationCenter:sharedNotificationCenter():postNotification("CAL_WIN_RATE_UPDATE", CCString:create(json.encode(dataTable)))                                    elseif tonumber(package[1]) == 101 then                                        -- 胜率计算完毕                                        CCNotificationCenter:sharedNotificationCenter():postNotification("CAL_WIN_RATE_UPDATE_END")                                    end                                end                                                            end, 0, false)

即主线程每一帧去检测缓冲区，如果有数据，则发送消息。

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