#ifndef _task_h_
#define _task_h_

#include <setjmp.h>

typedef int (TaskProc)(int, void*);

class Task {
  public:
  Task *prev; // links into run-state queues
  Task *next;
  Task *parent;

  jmp_buf state;

  unsigned *stack;
  unsigned stack_len;

  enum RunState {
    Running,
    Blocked,
    Waiting,
    Dead
  };
  RunState run_state;

  int ret_val;

  friend int fall_off_end();

public:
  
  Task(TaskProc proc=0, int val=0, void* ptr=0, int stacksize=1024); // use default proc in main() to setup initial task
  ~Task();
  
  int ReturnValue();
  
  friend int Wait(Task* child=0);
  friend void Return(int rv=0);
  friend void Yield();
};

extern Task *thisTask;

#endif