/*
 * spinlock.c
 *
 * Sung-Eun Choi (sungeun@cs.washington.edu)
 * Autumn 1996
 *
 */

#include <stdio.h>
#include "minithread.h"

void
spinlock_init(tas_lock_t *l)
{
  atomic_clear(l);                 /* reset the lock */
}

void
spinlock_unlock(tas_lock_t *l)
{
  atomic_clear(l);                 /* give up the lock */
}

void
spinlock_lock(tas_lock_t *l)
{

  while (atomic_test_and_set(l)) { /* while someone else has the lock */
    minithread_yield();            /* yield and let others do useful work */
  }

}