forked from naelag/lab2-f17
-
Notifications
You must be signed in to change notification settings - Fork 0
/
sleeplock.c
56 lines (47 loc) · 782 Bytes
/
sleeplock.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
// 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 = 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;
release(&lk->lk);
return r;
}