由於也剛初學,這裏打算從自己的一些理解,簡單介紹下ACE_Thread、ACE_Thread_Manager、ACE_Task
這裏先簡單些一點,有時間再做補充
ACE_Thread
void* worker(const char* arg)
{
ACE_OS::sleep(10);
puts(arg);
return NULL;
}
創建線程和等待結束:
ACE_thread_t ThreadID;
ACE_hthread_t Handle;
ACE_Thread::spawn(ACE_THR_FUNC(worker),"Hello,World!",THR_JOINABLE | THR_NEW_LWP,&ThreadID,&Handle);
ACE_Thread::join(Handle);
static int spawn (ACE_THR_FUNC func,
void *arg = 0,
long flags = THR_NEW_LWP | THR_JOINABLE,
ACE_thread_t *t_id = 0,
ACE_hthread_t *t_handle = 0,
long priority = ACE_DEFAULT_THREAD_PRIORITY,
void *stack = 0,
size_t stack_size = ACE_DEFAULT_THREAD_STACKSIZE,
ACE_Thread_Adapter *thread_adapter = 0,
const char** thr_name = 0);
此接口用於創建線程,其中參數func爲創建的線程執行的函數,arg爲函數的實參,flags一般採用默認,t_id爲線程ID,之前可以定義一個,t_handle爲線程句柄,後邊一些接口可以使用到,比如上面例子使用的join
static int join (ACE_hthread_t,
ACE_THR_FUNC_RETURN * = 0);
此接口用於等待線程結束,第一個參數爲spawn創建的線程句柄
static void exit (ACE_THR_FUNC_RETURN status = 0);
終止線程 static int setprio (ACE_hthread_t ht_id, int priority, int policy = -1);
設置線程優先級static int suspend (ACE_hthread_t);
掛起線程ACE_Thread_Manager
if(-1 == ACE_Thread_Manager::instance()->spawn_n(2,ACE_THR_FUNC(worker),"Hello,World!",THR_NEW_LWP,ACE_DEFAULT_THREAD_PRIORITY,1))
{
ACE_ERROR((LM_ERROR, "Failure to spawn first group of threads: %p \n"));
}
ACE_Thread_Manager::instance()->wait_grp(1);
執行結果:
int spawn_n (size_t n,
ACE_THR_FUNC func,
void *arg = 0,
long flags = THR_NEW_LWP | THR_JOINABLE | THR_INHERIT_SCHED,
long priority = ACE_DEFAULT_THREAD_PRIORITY,
int grp_id = -1,
ACE_Task_Base *task = 0,
ACE_hthread_t thread_handles[] = 0,
void *stack[] = 0,
size_t stack_size[] = 0,
const char* thr_name[] = 0);
此接口用於分配N個線程,參數含義基本同ACE_Thread::spawn,這裏不再另外說明
int wait_grp (int grp_id);
等待線程組結束,這裏的grp_id爲spawn_n的參數grp_idACE_Task
class CAceTask: public ACE_Task<ACE_MT_SYNCH>
{
public:
int open();
int svc();
int close();
};
int CAceTask::open()
{
//激活3個線程
return activate(THR_NEW_LWP,3);
}
int CAceTask::svc()
{
ACE_Message_Block *MsgDate = NULL;
const char *sp = NULL;
do
{
//超時時間設置
timeval tm;
tm.tv_sec = 1;
ACE_Time_Value timeValue(tm);
//獲取put的數據,這裏只等待1秒
if(-1 == getq(MsgDate,&timeValue))
{
break;
}
sp = (const char*)MsgDate->rd_ptr();
MsgDate->release(); //釋放Message_Block
cout<<sp<<endl;
//釋放指針
delete sp;
sp = NULL;
}
while(true);
return 0;
}
CAceTask t;
t.open();
ACE_Message_Block *MsgDate = NULL;
for(int i = 0; i != 5; ++i)
{
char *sp = new char[6];
strcpy(sp,"wwwww");
MsgDate = new ACE_Message_Block(sp,6);
t.putq(MsgDate);
}
//等待線程全部結束
ACE_Thread_Manager::instance()->wait();
簡單介紹:
ACE_Task類中的隊列採用ACE_Message_Queue隊列,另外一個擴展版本類ACE_Task_Ex採用了ACE_Message_Queue_Ex隊列。
Open虛函數在ACE_Task類內部並沒有做任何事情,作爲ACE的習慣open函數基本上時所有類的起始函數,用戶程序可以在此函數內部完成初始化工作,比如調用activate啓動線程
Activate函數定義如下:
activate(long flags = THR_NEW_LWP | THR_JOINABLE |THR_INHERIT_SCHED ,
int n_threads = 1,
int force_active = 0,
long priority =ACE_DEFAULT_THREAD_PRIORITY,
int grp_id = -1,
ACE_Task_Base *task =0,
ACE_hthread_tthread_handles[] = 0,
void *stack[] = 0,
size_t stack_size[] =0,
ACE_thread_tthread_ids[] = 0);
這個函數參數看上去比較多,其實大部分都可以使用缺省參數,用戶在調用時可以只調用activate()或者activate(LWP_NEW_THR, 1)。如果需要啓動多個線程時我們可以這樣調用activate(LWP_NEW_THR, 10, 0,ACE_DEFAULT_THREAD_PRIORITY, -1, 0, 0, 0, 0, thread_ids),最後一個參數thread_ids在多線程中時有用的。ACE_Task線程運行函數:svc
svc函數是真正的線程函數體,svc也是虛函數需要用戶重置,當通過activate啓動多個線程後,我們可以在svc函數體內根據ACE_Thread_::self()==thread_ids[i] 比較來啓動相應的用戶處理函數。例如:#define THREADS 2
class Task_Test : public ACE_Task<ACE_MT_SYNCH>
{
public:
~Task_Test();
int open(void*);
int svc(void);
int close(u_long);
private:
void handle_thread_1(u_long);
void handle_thread_2(u_long);
private:
ACE_thread_t thread_ids[THREADS];
};
Task_Test::~Task_Test()
{
wait(); //等待所有的線程退出
}
int Task_Test::open(void*)
{
activate(THR_NEW_LWP,
THREADS,
0,
ACE_DEFAULT_THREAD_PRIORITY,
-1,
0,
0,
0,
0,
thread_ids);
return 0;
}
int Task_Test::svc(void)
{
for (int i = 0; i < THREADS; i++) {
if (ACE_Thread::self() == thread_ids[i])
switch (i) {
case 0:
handle_thread_1(thread_ids[i]);
break;
case 1:
handle_thread_2(thread_ids[i]);
break;
default:
break;
}
}
return 0;
}
int Task_Test::close(u_long code)
{
printf("thread exit:%d\n", code);
return 0;
}
void Task_Test::handle_thread_1(u_long code)
{
printf("this is thread:%d\n", code);
}
void Task_Test::handle_thread_2(u_long code)
{
printf("this is thread:%d\n", code);
}
int main(int argv, char * argc[])
{
Task_Test task;
task.open(0);
return 0;
}