blob: f16572053b93c997138290a3e7daa5a309da3f2f (
plain)
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
|
/* Copyright (c) 2013, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <odp/spinlock.h>
#include <odp_atomic_internal.h>
#include <odp_spin_internal.h>
void odp_spinlock_init(odp_spinlock_t *spinlock)
{
_odp_atomic_flag_init(&spinlock->lock, 0);
}
void odp_spinlock_lock(odp_spinlock_t *spinlock)
{
/* While the lock is already taken... */
while (_odp_atomic_flag_tas(&spinlock->lock))
/* ...spin reading the flag (relaxed MM),
* the loop will exit when the lock becomes available
* and we will retry the TAS operation above */
while (_odp_atomic_flag_load(&spinlock->lock))
odp_spin();
}
int odp_spinlock_trylock(odp_spinlock_t *spinlock)
{
return (_odp_atomic_flag_tas(&spinlock->lock) == 0);
}
void odp_spinlock_unlock(odp_spinlock_t *spinlock)
{
_odp_atomic_flag_clear(&spinlock->lock);
}
int odp_spinlock_is_locked(odp_spinlock_t *spinlock)
{
return _odp_atomic_flag_load(&spinlock->lock) != 0;
}
|
