// TODO: CHECK/REPLACE/UPDATE OLD CODE (this file is based on xv6)
// Sleeping locks

#include "types.h"
#include "riscv.h"
#include "defs.h"
#include "param.h"
#include "memlayout.h"
#include "sched.h"
#include "proc.h"
#include "sched.h"

void
initsleeplock(sched_sleeplock_t *lk, char *name)
{
  initlock(&lk->spin, "sleep lock");
  lk->debugstring = name;
  lk->islocked = 0;
  lk->pid = 0;
}

void
acquiresleep(sched_sleeplock_t *lk)
{
  acquire(&lk->spin);
  while (lk->islocked) {
    sleep(lk, &lk->spin);
  }
  lk->islocked = 1;
  lk->pid = myproc()->pid;
  release(&lk->spin);
}

void
releasesleep(sched_sleeplock_t *lk)
{
  acquire(&lk->spin);
  lk->islocked = 0;
  lk->pid = 0;
  sched_wake(lk);
  release(&lk->spin);
}

int
holdingsleep(sched_sleeplock_t *lk)
{
  int r;
  
  acquire(&lk->spin);
  r = lk->islocked && (lk->pid == myproc()->pid);
  release(&lk->spin);
  return r;
}