57 lines
778 B
C
57 lines
778 B
C
|
// Sleeping locks
|
||
|
|
|
||
|
|
#include "types.h"
|
||
|
|
#include "defs.h"
|
||
|
|
#include "param.h"
|
||
|
|
#include "x86.h"
|
||
|
|
#include "memlayout.h"
|
||
|
|
#include "mmu.h"
|
||
|
|
#include "proc.h"
|
||
|
|
#include "spinlock.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 = proc->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;
|
||
|
|
release(&lk->lk);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|