// Sleeping locks

#include "types.h"

#include "riscv.h"

#include "defs.h"

#include "param.h"

#include "memlayout.h"

#include "spinlock.h"

#include "proc.h"

#include "sleeplock.h"

void

initsleeplock(struct sleeplock *lk, char *name)

{

initlock(&lk->lk, "sleep lock");

lk->name = name;

lk->locked = 0;

lk->pid = 0;

}

void

acquiresleep(struct sleeplock *lk)

{

acquire(&lk->lk);

while (lk->locked) {

sleep(lk, &lk->lk);

}

lk->locked = 1;

lk->pid = myproc()->pid;

release(&lk->lk);

}

void

releasesleep(struct sleeplock *lk)

{

acquire(&lk->lk);

lk->locked = 0;

lk->pid = 0;

wakeup(lk);

release(&lk->lk);

}

int

holdingsleep(struct sleeplock *lk)

{

int r;

acquire(&lk->lk);

r = lk->locked && (lk->pid == myproc()->pid);

release(&lk->lk);

return r;

}