processmanager.cc

linux的例子,就是下载后到自己的机子上去运行

#include "processmanager.h"

ProcessManager::ProcessManager(){
	t=new Table(16);	
}

ProcessManager::~ProcessManager(){
	if(t!=NULL)
		delete t;
}

int
ProcessManager::Getpid(int ppid){
	process=new Process();
	process->ppid=ppid;
	process->status=0;
	process->active=1;
	process->joined=1;
	process->joinsem=new Semaphore("process",0);
	process->pid=t->Alloc(process)+1;
	return process->pid;
}

void
ProcessManager::Release(int pid,int status){
	Process *proc;
	if(pid==0) return;
	proc=(Process*)(t->Get(pid-1));
	proc->active=0;
	proc->status=status;
	if(proc->joinsem!=NULL)
		proc->joinsem->V();
	if(proc->ppid==0)
		PListController(proc->pid,proc->ppid);
	t->Release(pid-1);
}

bool
ProcessManager::getStatus(int pid,int ppid,int *status){
	return true;
}	

void
ProcessManager::PListController(int pid,int ppid){
	int i;
	Process *proc;
	for(i=0;i<1024;i++){
		proc=(Process*)(t->Get(i));
		if(proc==NULL) continue;
		if(proc->pid==pid&&proc->ppid==0)
			t->Release(i);
		else if(proc->ppid==pid){
			if(proc->active==1)
				proc->ppid=0;
			else
				t->Release(i);
		}
	}
}