futex同步机制分析之三内核实现

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发布时间：2019-03-04

本文共 2347 字，大约阅读时间需要 7 分钟。

Linux????Futex???????Pi-Futex?????

??Futex?????

Futex?Futex???????????Linux?????????????????????????????????????????????????????????????????????????????

1.1 Futex?????

Futex????????????????????????

struct futex_q???????Futex????????????????
- plist_node list???????Futex??????????????
- task_struct *task?????Futex???????????
- spinlock_t *lock_ptr?????Futex???????
- union futex_key key?Futex???????????????????Futex?
- futex_pi_state *pi_state????????????????
- rt_mutex_waiter *rt_waiter?????Futex??????

union futex_key????Futex??????????????Futex?????????

struct shared???????????Futex?????????????

struct private???????????Futex????????????????

struct both????????????Futex?????????????

struct futex_hash_bucket?????????????????
- spinlock_t lock???????????
- plist_head chain????????Futex?????

?????????????Futex?????????

1.2 Futex?????

Futex?????????????????????

Futex??????????futex_init??????????????Futex????????

Futex???????

futex_wait???Futex????????????????

futex_wake?????Futex????????????

futex_requeue?????Futex?????????????????

Futex???????Pi-Futex????futex_lock_pi?futex_unlock_pi?????????????????????Pi-Futex????????????????????????????????

??Futex?????

Futex?????????syscall_futex????????????????????

2.1 Futex???????

FUTEX_WAIT???Futex?????????????

FUTEX_WAKE?????Futex????

FUTEX_REQUEUE?????Futex?????

FUTEX_CMP_REQUEUE??????????????????????????

FUTEX_LOCK_PI?????????????

FUTEX_UNLOCK_PI?????????????

2.2 Futex???????

????do_futex???????Futex????????????????

????????????????????????

???????????

???????FUTEX_WAIT?FUTEX_WAIT_BITSET?????futex_wait?

???????FUTEX_WAKE?FUTEX_WAKE_BITSET?????futex_wake?

?????????FUTEX_REQUEUE?FUTEX_CMP_REQUEUE?????futex_requeue?

????????????FUTEX_LOCK_PI?FUTEX_UNLOCK_PI????????Pi-Futex???

?????????????????????

??Futex???

3.1 Futex???

Futex?????????????????????

??????????????????Futex????????????????????????????

?????????Futex???????????????????

???????????????????????????????????????????

3.2 Futex???

??Futex????????????????

?????Futex???????????????????????????

????????????????????????????

???????Futex?????????????????????????????

3.3 Futex?????

Futex??????????

???????????????????????

?????????????????????????

??????????Futex??????????????

????????????????????????

????

???Futex??????????????Linux?????????Futex?????????????????????????????????????????????????Futex??????????????????????????????????

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