do_futex

函数名称：do_futex

函数原型：long do_futex(unsigned int __user *uaddr, int op, unsigned int val, ktime_t *timeout, unsigned int __user *uaddr2, unsigned int val2, unsigned int val3)

返回类型：long

参数：

类型	参数	名称
unsigned int __user *	uaddr
int	op
unsigned int	val
ktime_t *	timeout
unsigned int __user *	uaddr2
unsigned int	val2
unsigned int	val3

3861

flags或等于FLAGS_CLOCKRT

3863

如果cmd不等于Second argument to futex syscall 且cmd不等于FUTEX_WAIT_BITSET且cmd不等于FUTEX_WAIT_REQUEUE_PI则返回:负ENOSYS

3868

当:cmd恒等于FUTEX_LOCK_PI

3869

当:cmd恒等于FUTEX_UNLOCK_PI

3870

当:cmd恒等于FUTEX_TRYLOCK_PI

3871

当:cmd恒等于FUTEX_WAIT_REQUEUE_PI

3872

当:cmd恒等于FUTEX_CMP_REQUEUE_PI

3873

如果非futex_cmpxchg_enabled则返回:负ENOSYS

3878

当:cmd恒等于Second argument to futex syscall

3879

val3等于set with all bits set for the FUTEX_xxx_BITSET OPs to request a* match of any bit.

3881

当:cmd恒等于FUTEX_WAIT_BITSET

3882

返回:futex_wait(uaddr, flags, val, timeout, val3)

3883

当:cmd恒等于FUTEX_WAKE

3884

val3等于set with all bits set for the FUTEX_xxx_BITSET OPs to request a* match of any bit.

3886

当:cmd恒等于FUTEX_WAKE_BITSET

3887

返回:Wake up waiters matching bitset queued on this futex (uaddr).

3888

当:cmd恒等于FUTEX_REQUEUE

3889

返回:ex_requeue() - Requeue waiters from uaddr1 to uaddr2*@uaddr1: source futex user address*@flags: futex flags (FLAGS_SHARED, etc

3890

当:cmd恒等于FUTEX_CMP_REQUEUE

3891

返回:ex_requeue() - Requeue waiters from uaddr1 to uaddr2*@uaddr1: source futex user address*@flags: futex flags (FLAGS_SHARED, etc

3892

当:cmd恒等于FUTEX_WAKE_OP

3893

返回:Wake up all waiters hashed on the physical page that is mapped* to this virtual address:

3894

当:cmd恒等于FUTEX_LOCK_PI

3895

返回: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

3896

当:cmd恒等于FUTEX_UNLOCK_PI

3897

返回:Userspace attempted a TID -> 0 atomic transition, and failed.* This is the in-kernel slowpath: we look up the PI state (if any),* and do the rt-mutex unlock.

3898

当:cmd恒等于FUTEX_TRYLOCK_PI

3899

3900

当:cmd恒等于FUTEX_WAIT_REQUEUE_PI

3901

val3等于set with all bits set for the FUTEX_xxx_BITSET OPs to request a* match of any bit.

3902

返回:ex_wait_requeue_pi() - Wait on uaddr and take uaddr2*@uaddr: the futex we initially wait on (non-pi)*@flags: futex flags (FLAGS_SHARED, FLAGS_CLOCKRT, etc

3904

当:cmd恒等于FUTEX_CMP_REQUEUE_PI

3905

返回:ex_requeue() - Requeue waiters from uaddr1 to uaddr2*@uaddr1: source futex user address*@flags: futex flags (FLAGS_SHARED, etc

3907

返回:负ENOSYS

**调用者**
名称	描述
SYSCALL_DEFINE6

源代码转换工具开放的插件接口	X
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