futex_lock_pi

函数名称：ex_lock_pi_atomic() - Atomic work required to acquire a pi aware futex*@uaddr: the pi futex user address*@hb: the pi futex hash bucket*@key: the futex key associated with uaddr and hb*@ps: the pi_state pointer where we store the result of the* lookup

函数原型：static int futex_lock_pi_atomic(unsigned int __user *uaddr, struct futex_hash_bucket *hb, union futex_key *key, struct futex_pi_state **ps, struct task_struct *task, struct task_struct **exiting, int set_waiters)

返回类型：int

参数：

类型	参数	名称
unsigned int __user *	uaddr
struct futex_hash_bucket *	hb
union futex_key *	key
struct futex_pi_state **	ps
struct task_struct *	task
struct task_struct **	exiting
int	set_waiters

1428

vpid等于task_pid_vnr(task)

1436

如果get_futex_value_locked( & uval, uaddr)则返回:负EFAULT

1439

如果此条件成立可能性小(为编译器优化)(should_fail_futex(true))则返回:负EFAULT

1445

如果此条件成立可能性小(为编译器优化)((uval & The rest of the robust-futex field is for the TID:) == vpid)则返回:负EDEADLK

1448

如果此条件成立可能性小(为编译器优化)(should_fail_futex(true))则返回:负EDEADLK

1455

top_waiter等于ex_top_waiter() - Return the highest priority waiter on a futex*@hb: the hash bucket the futex_q's reside in*@key: the futex key (to distinguish it from other futex futex_q's)* Must be called with the hb lock held.

1456

如果top_waiter则返回:Validate that the existing waiter has a pi_state and sanity check* the pi_state against the user space value. If correct, attach to* it.

1465

如果非uval按位与The rest of the robust-futex field is for the TID:的值则

1470

newval等于uval按位与The kernel signals via this bit that a thread holding a futex* has exited without unlocking the futex. The kernel also does* a FUTEX_WAKE on such futexes, after setting the bit, to wake* up any possible waiters:

1471

newval或等于vpid

1474

如果set_waiters则newval或等于Are there any waiters for this robust futex:

1477

ret等于lock_pi_update_atomic(uaddr, uval, newval)

1479

返回:如果ret小于0则ret否则1

1487

newval等于uval按位或Are there any waiters for this robust futex:

1488

ret等于lock_pi_update_atomic(uaddr, uval, newval)

1489

如果ret则返回:ret

1496

返回:Lookup the task for the TID provided from user space and attach to* it after doing proper sanity checks.

**调用者**
名称	描述
futex_proxy_trylock_atomic	ex_proxy_trylock_atomic() - Attempt an atomic lock for the top waiter@pifutex: the user address of the to futex@hb1: the from futex hash bucket, must be locked by the caller@hb2: the to futex hash bucket, must be locked by the caller@key1: the from
futex_lock_pi	Userspace tried a 0 -> TID atomic transition of the futex value* and failed. The kernel side here does the whole locking operation:* if there are waiters then it will block as a consequence of relying* on rt-mutexes, it does PI, etc

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

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