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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package linux
// From <linux/futex.h> and <sys/time.h>.
// Flags are used in syscall futex(2).
const (
FUTEX_WAIT = 0
FUTEX_WAKE = 1
FUTEX_FD = 2
FUTEX_REQUEUE = 3
FUTEX_CMP_REQUEUE = 4
FUTEX_WAKE_OP = 5
FUTEX_LOCK_PI = 6
FUTEX_UNLOCK_PI = 7
FUTEX_TRYLOCK_PI = 8
FUTEX_WAIT_BITSET = 9
FUTEX_WAKE_BITSET = 10
FUTEX_WAIT_REQUEUE_PI = 11
FUTEX_CMP_REQUEUE_PI = 12
FUTEX_PRIVATE_FLAG = 128
FUTEX_CLOCK_REALTIME = 256
)
// These are flags are from <linux/futex.h> and are used in FUTEX_WAKE_OP
// to define the operations.
const (
FUTEX_OP_SET = 0
FUTEX_OP_ADD = 1
FUTEX_OP_OR = 2
FUTEX_OP_ANDN = 3
FUTEX_OP_XOR = 4
FUTEX_OP_OPARG_SHIFT = 8
FUTEX_OP_CMP_EQ = 0
FUTEX_OP_CMP_NE = 1
FUTEX_OP_CMP_LT = 2
FUTEX_OP_CMP_LE = 3
FUTEX_OP_CMP_GT = 4
FUTEX_OP_CMP_GE = 5
)
// FUTEX_TID_MASK is the TID portion of a PI futex word.
const FUTEX_TID_MASK = 0x3fffffff
// Constants used for priority-inheritance futexes.
const (
FUTEX_WAITERS = 0x80000000
FUTEX_OWNER_DIED = 0x40000000
)
// FUTEX_BITSET_MATCH_ANY has all bits set.
const FUTEX_BITSET_MATCH_ANY = 0xffffffff
// ROBUST_LIST_LIMIT protects against a deliberately circular list.
const ROBUST_LIST_LIMIT = 2048
// RobustListHead corresponds to Linux's struct robust_list_head.
//
// +marshal
type RobustListHead struct {
List uint64
FutexOffset uint64
ListOpPending uint64
}
// SizeOfRobustListHead is the size of a RobustListHead struct.
var SizeOfRobustListHead = (*RobustListHead)(nil).SizeBytes()
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