diff options
| author | Fabricio Voznika <fvoznika@google.com> | 2019-03-05 23:39:14 -0800 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2019-03-05 23:40:18 -0800 |
| commit | 0b76887147820a809beaa497ede8dc4f7b7b120a (patch) | |
| tree | a89be091add2e39163cefe84bf3614a6338f3cd9 /pkg/sentry/usermem/usermem.go | |
| parent | fcba4e8f040ab4b40e04b9315d718d7e5aa44635 (diff) | |
Priority-inheritance futex implementation
It is Implemented without the priority inheritance part given
that gVisor defers scheduling decisions to Go runtime and doesn't
have control over it.
PiperOrigin-RevId: 236989545
Change-Id: I714c8ca0798743ecf3167b14ffeb5cd834302560
Diffstat (limited to 'pkg/sentry/usermem/usermem.go')
| -rw-r--r-- | pkg/sentry/usermem/usermem.go | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/pkg/sentry/usermem/usermem.go b/pkg/sentry/usermem/usermem.go index 75ac4d22d..c3c9c153b 100644 --- a/pkg/sentry/usermem/usermem.go +++ b/pkg/sentry/usermem/usermem.go @@ -103,6 +103,13 @@ type IO interface { // any following locks in the lock order. addr must be aligned to a 4-byte // boundary. CompareAndSwapUint32(ctx context.Context, addr Addr, old, new uint32, opts IOOpts) (uint32, error) + + // LoadUint32 atomically loads the uint32 value at addr and returns it. + // + // Preconditions: The caller must not hold mm.MemoryManager.mappingMu or + // any following locks in the lock order. addr must be aligned to a 4-byte + // boundary. + LoadUint32(ctx context.Context, addr Addr, opts IOOpts) (uint32, error) } // IOOpts contains options applicable to all IO methods. |