| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| #ifndef _BIONIC_FUTEX_H |
| #define _BIONIC_FUTEX_H |
| |
| #include <errno.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <sys/cdefs.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| #define FUTEX_WAIT 0 |
| #define FUTEX_WAKE 1 |
| #define FUTEX_FD 2 |
| #define FUTEX_REQUEUE 3 |
| /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ |
| #define FUTEX_CMP_REQUEUE 4 |
| #define FUTEX_WAKE_OP 5 |
| #define FUTEX_LOCK_PI 6 |
| #define FUTEX_UNLOCK_PI 7 |
| /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ |
| #define FUTEX_TRYLOCK_PI 8 |
| #define FUTEX_WAIT_BITSET 9 |
| #define FUTEX_WAKE_BITSET 10 |
| #define FUTEX_WAIT_REQUEUE_PI 11 |
| /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ |
| #define FUTEX_CMP_REQUEUE_PI 12 |
| #define FUTEX_PRIVATE_FLAG 128 |
| #define FUTEX_CLOCK_REALTIME 256 |
| #define FUTEX_CMD_MASK ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME) |
| #define FUTEX_TID_MASK 0x3fffffff |
| #define FUTEX_OWNER_DIED 0x40000000 |
| #define FUTEX_WAITERS 0x80000000 |
| |
| /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ |
| #define FUTEX_WAIT_PRIVATE (FUTEX_WAIT | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_WAKE_PRIVATE (FUTEX_WAKE | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_REQUEUE_PRIVATE (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_CMP_REQUEUE_PRIVATE (FUTEX_CMP_REQUEUE | FUTEX_PRIVATE_FLAG) |
| /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ |
| #define FUTEX_WAKE_OP_PRIVATE (FUTEX_WAKE_OP | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_LOCK_PI_PRIVATE (FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_UNLOCK_PI_PRIVATE (FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG) |
| /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ |
| #define FUTEX_WAIT_BITSET_PRIVATE (FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_WAKE_BITSET_PRIVATE (FUTEX_WAKE_BITSET | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_WAIT_REQUEUE_PI_PRIVATE (FUTEX_WAIT_REQUEUE_PI | FUTEX_PRIVATE_FLAG) |
| #define FUTEX_CMP_REQUEUE_PI_PRIVATE (FUTEX_CMP_REQUEUE_PI | FUTEX_PRIVATE_FLAG) |
| #ifndef __predict_false |
| #define __predict_false(exp) __builtin_expect((exp) != 0, 0) |
| #endif // __predict_false |
| |
| struct timespec; |
| |
| static inline __always_inline int __futex(volatile void* ftx, int op, int value, const struct timespec* timeout) |
| { |
| // Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to. |
| int result = syscall(__NR_futex, ftx, op, value, timeout); |
| return result; |
| } |
| |
| static inline int __futex_wake(volatile void* ftx, int count) |
| { |
| return __futex(ftx, FUTEX_WAKE, count, NULL); |
| } |
| |
| static inline int __futex_wake_ex(volatile void* ftx, bool shared, int count) |
| { |
| return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL); |
| } |
| |
| static inline int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) |
| { |
| return __futex(ftx, FUTEX_WAIT, value, timeout); |
| } |
| |
| static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value, const struct timespec* timeout) |
| { |
| return __futex(ftx, shared ? FUTEX_WAIT : FUTEX_WAIT_PRIVATE, value, timeout); |
| } |
| |
| #endif /* _BIONIC_FUTEX_H */ |