blob: a87cb179f021bc4d8b50f0d908551618176a0895 (
plain) (
blame)
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
|
#include "fork_aware_spin_lock.h"
#include "at_fork.h"
namespace NYT::NThreading {
////////////////////////////////////////////////////////////////////////////////
void TForkAwareSpinLock::Acquire() noexcept
{
GetForkLock()->AcquireReaderForkFriendly();
SpinLock_.Acquire();
// To compensate for one of the above acquisitions.
NDetail::RecordSpinLockReleased();
}
bool TForkAwareSpinLock::TryAcquire() noexcept
{
if (!GetForkLock()->TryAcquireReaderForkFriendly()) {
return false;
}
if (!SpinLock_.TryAcquire()) {
GetForkLock()->ReleaseReader();
return false;
}
// See Acquire.
NDetail::RecordSpinLockReleased();
return true;
}
void TForkAwareSpinLock::Release() noexcept
{
// See Acquire.
NDetail::RecordSpinLockAcquired();
SpinLock_.Release();
GetForkLock()->ReleaseReader();
}
bool TForkAwareSpinLock::IsLocked() const noexcept
{
return SpinLock_.IsLocked();
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NThreading
|
