63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
// Copyright 2018 Google LLC
|
|
//
|
|
// 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
|
|
)
|