void service_request(void* a){
//cout<<"111\n";
mutex1.lock();
for(int i=0; i<disks.size(); ++i){
thread t2 ((thread_startfunc_t) requester, (void *)i);
}
mutex1.unlock();
mutex1.lock();
while(diskQueue.size()<max_disk_queue && totalnum>0){
cv2.wait(mutex1);
}
int min=abs(track-diskQueue[0].second);
int n=0;
for(int i=1; i<diskQueue.size(); ++i){
if(abs(track-diskQueue[i].second) < min){
min=abs(track-diskQueue[i].second);
n=i;
}
}
track=diskQueue[n].second;
cout<<"service requester "<<diskQueue[n].first<<" track "<<diskQueue[n].second<<endl;
diskQueue.erase(diskQueue.begin()+n);
cv1.signal();
mutex1.unlock();
}
void requester(void* a){
intptr_t num= (intptr_t) a;
//cout<<"222 "<<num<<endl;
//mutex1.lock();
//mutex1.unlock();
mutex1.lock();
//cout<<"diskQueue size: "<<diskQueue.size()<<endl;
//cout<<"totalnum: "<<totalnum<<endl;
while(diskQueue.size()==max_disk_queue || totalnum==0){
cv1.wait(mutex1);
}
if(!disks[num].empty()){
cout<<"requester "<< num <<" track "<<disks[num].front()<<endl;
diskQueue.push_back(make_pair(num, disks[num].front()));
disks[num].pop();
totalnum--;
}
cv2.signal();
mutex1.unlock();
}
