我正在尝试构建自己的库来使用和调度线程。
该系统正在以您可以的方式工作make maximum 100 threads，使它们“准备就绪”。然后有一个调度器，每个时间段，把活跃的线程，放到就绪链表中，取就绪链表中的第一个等待线程。
我的测试人员正在创建500000线程，每个线程都会创建一个新线程并尝试自行终止。第二个线程（第一个线程创建）做同样的事情。第三个只是终止自身。
这是测试仪：
void f3()
{
printf("f3 before terminate\n");
uthread_terminate(uthread_get_tid());
printf("f3 after terminate\n");
}
void f2()
{
printf("f2 before spawn\n");
uthread_spawn(f3);
printf("f2 after spawn\n");
uthread_terminate(uthread_get_tid());
printf("f2 after termination\n");
}
void f1()
{
printf("f1 before spawn\n");
uthread_spawn(f2);
printf("f1 after spawn\n");
uthread_terminate(uthread_get_tid());
printf("f1 after termination\n");
}
int main(int argc, char **argv)
{
printf("test8:\n--------------\n");
cout << "* Output should be:\n";
cout << "--------------\n";
cout << "***1***\n";
cout << "***2***\n";
cout << "Output is:\n";
uthread_init(100);
printf("***1***\n");
for (volatile int i=0; i< 50000;++i){
uthread_spawn(f1);
}
printf("***2***\n");
uthread_terminate(0);
return 0;
}
虽然我的程序在进入我的调度程序时出现“分段错误”：
static void scheduler(){
DBG(("Schedular "))
nQuantum++;
if (ready.size()!=0){
if (active != NULL){
if (active->getState() == Thread::RUNNING){
active->setState(Thread::READY);
ready.push_back(active);
}
int val = sigsetjmp(*active->getEnv(),1);
if (val !=0){
blockTimerSignal(UNBLOCK);
return;
}
}
// Set new Active
active = ready.front();
DBG(("Active thread Id: %d",active->getTid()))
ready.pop_front();
DBG(("Doing pop front on ready list"))
DBG(("Number of threads in ready list is - %d",(ready.size())))
active->setQuantums(active->getQuantums()+1);
active->setState(Thread::RUNNING);
setTimer();
blockTimerSignal(UNBLOCK);
DBG(("UNBLOCKED"))
siglongjmp(*active->getEnv(),1);
DBG(("After siglong jmp"))
}else{
active->setQuantums(active->getQuantums()+1);
}
DBG(("Number of threads in ready list is - %d",(ready.size())))
blockTimerSignal(UNBLOCK);
}
做的时候siglongjmp(*active->getEnv(),1);
它只发生在主线程（程序的第一个 id 为 0 的线程）。它也会在程序运行一段时间后发生，这意味着在程序中间，它可以为活动线程执行 siglongjmp，但是当它在一段时间后再次尝试时，它会给出错误。
如果有帮助，添加我的终止功能：
int uthread_terminate(int tid) {
DBG(("Terminate - %d", tid))
if (tid == 0){
// delete all (threads) - don't think it's needed because using stl!
// TODO : check if needed - and then delete all lists !
//Added by Roni - Deleting all lists!
while(!sleeping.empty()){
delete (sleeping.front());
sleeping.pop_front();
}
while(!suspended.empty()){
delete (suspended.front());
suspended.pop_front();
}
while(!ready.empty()){
delete (ready.front());
ready.pop_front();
}
exit(0);
}
pThread t = getThread(tid);
if (t == NULL){
errmsgLibrary(THREAD_NOT_FOUND);
return FAIL;
}
Thread::threadState state = t->getState();
DBG(("Terminate - %d in State %d", tid, state))
DBG(("Number of threads in ready list is - %d",(ready.size())))
blockTimerSignal(BLOCK);
switch (state){
case (Thread::RUNNING):
//DBG(("Running Case"))
//DBG(("Active thread id is: %d ",active->getTid()))
delete active;
active = NULL;
//DBG(("Finsihed running Case"))
scheduler();
break;
case (Thread::READY):
//DBG(("ready Case"))
ready.remove(t);
delete t;
//DBG(("Finsihed ready Case"))
break;
case (Thread::SLEEP):
sleeping.remove(t);
delete t;
break;
case (Thread::SUSPENDED):
suspended.remove(t);
delete t;
break;
default:
break;
}
//DBG(("Number of threads in ready list is - %d",(ready.size())))
blockTimerSignal(UNBLOCK);
return SUCCESS;
}