suspend不能 ？

peakzhang

Ubuntu 6.06 + ACE 5.5 + gcc 4.0.2线程模型posix

我从ACE_Task<ACE_MT_SYNCH>派生的类，不知为何不能挂起，跑得贼欢，烦请各位指点 orz

code:

2. #include "ace/Log_Msg.h"
3. #include "ace/Task_T.h"
5. class Messager : public ACE_Task<ACE_MT_SYNCH>
6. {
7. public:
8.         Messager(){}
10.         virtual int svc(void)
11.         {
12.                 while(1){
13.                         suspend();
14.                         ACE_DEBUG((LM_INFO, "in svc()\n"));
15.                         ACE_OS::sleep(3);
16.                 }
17.                 return 0;
18.         }
19. };
22. int main(int argc, ACE_TCHAR* argv[])
23. {
24.         Messager mm;
26.         mm.activate(THR_NEW_LWP|THR_SUSPENDED|THR_JOINABLE); //SUSPENDED seems not take effect, maybe implement it myself with cond?
27.         mm.suspend();
28.         ACE_DEBUG((LM_DEBUG, "suspend it\n"));
30.         while(1);
31.         mm.wait();
33.         return 0;
34. }

复制代码

peakzhang

can you try to get  ACE_OS::last_error();
Not all the platforms support suspend.
Which kernel version you have. Most likely your kernel doesn't support suspend.
BTW, suspend from another thread is not good idea.

peakzhang

My kernel is 2.6.17-10 ...
I tried ACE_OS::last_error(), which returned 95.
I used ACE_OS::perror, it said "Operation not supported"

I got it, thanks very much

One more thing, "suspend from another thread is not good idea", do you mean such action may cause fatal error like segment fault , or mean it may suspend that thread in some unexpected place?