. OS, API- .
class OS {
OS() {...};
public int CreateProcess(int ProcType, int baseprior)
{
...
return pid;
}
public void MyResume(int pid) {
...
}
public void MySuspend(int pid){
...
}...
}
}
OS , . , , : . , , :
class Description {
int pid; //
int state; //
int prior; //
MyProcess context; //
...
}
, Collection List, ArrayList.
. , , , , API- .
, :
class NTimerThread implements Runnable{
Thread t;
NTimerThread () //
{
t = new Thread(this); //
t.start(); //
}
public void run() // ,
//
{
try
{
while (true) //
{
Date d=new Date(); //
System.out.println(d.toString()); //
//
Thread.sleep(1000); //
//,
//
//
}
} catch (InterruptedException e) {
System.out.println("Thread");
}
}
};
. . , 0.2 - :
while (true) //
{
Random rand= new Random();
Date d=new Date(); //
System.out.println(d.toString()); //
//
Thread.sleep(1000); //
//,
//
//
if (rand.nextDouble()<0.2) os.myterminate(pid);
// 0.2 //API
}
os - OS, pid - . , , , " ()":
|
|
|
abstract class MyProcess implements Runnable
{
int pid;
Thread t;
...
public void resume()
{
t.start();
}
public void suspend()
{
t.suspend();
}
public void terminate()
{
t.stop();
}
...
}
,
class NThread extends MyProcess implements Runnable{
OS os;
NThread (OS myos, int apid){
os=myos;
pid=apid;
t = new Thread(this);
...
}
. , void MainKernel (), . . . mainkernel:
1) , ;
2) . MyProcess.resume();
3) ( Threed.sleep() );
4) , MyProcess.suspend();
5) . .
6) , . .1.
. , , .
, , , . , (System.out.println()).
1.3
. , , :
1) : exec T P, T - , P - (, exec 1 6).
2) : kill PID, PID - .
3) : ps.
, , ..
