#include <iostream.h>
#include "Task.h"
#include "String.h"

Task::Task() : state(TASK_ON_HOLD), suspended(false) {}
Task::~Task() {}

int Task::Do() {
    return TASK_ON_HOLD;
}

int Task::Run() {
    cerr << "Running task '" << GetName() << "'...\n";
    try {
	state = Do();
    }
    catch (TaskSwitch) {
	Resume(1);
	throw;
    }
    catch (GeneralException e) {
	cerr << "Task " << GetName() << " caused an unexpected exception: '" << e.GetMsg() << "', closing it.\n";
	return TASK_DONE;
    }
        
    return state;
}

int Task::GetState() {
    return state;
}

String Task::GetName() {
    return "Unknow Task";
}

int Task::Suspend() throw (GeneralException) {
    int r;
    
    cerr << "Suspending task " << GetName() << "...\n";
    
    suspended = true;
    
    r = setjmp(env);
    
    if (!r) throw TaskSwitch();
    
    return r;
}

void Task::Resume(int val) throw (GeneralException) {
    if (suspended) {
	cerr << "Resuming task " << GetName() << "...\n";
	suspended = false;
	longjmp(env, val);
    } else {
	throw GeneralException(String("Task ") + GetName() + " was not suspended.");
    }
}