do_futex

Name:do_futex

Proto: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)

Type:long

Parameter:

Type	Parameter	Name
unsigned int __user *	uaddr
int	op
unsigned int	val
ktime_t *	timeout
unsigned int __user *	uaddr2
unsigned int	val2
unsigned int	val3

3861

flags |= FLAGS_CLOCKRT

3863

If cmd != Second argument to futex syscall && cmd != FUTEX_WAIT_BITSET && cmd != FUTEX_WAIT_REQUEUE_PI Then Return -ENOSYS

3868

Case cmd == FUTEX_LOCK_PI

3869

Case cmd == FUTEX_UNLOCK_PI

3870

Case cmd == FUTEX_TRYLOCK_PI

3871

Case cmd == FUTEX_WAIT_REQUEUE_PI

3872

Case cmd == FUTEX_CMP_REQUEUE_PI

3873

If Not futex_cmpxchg_enabled Then Return -ENOSYS

3878

Case cmd == Second argument to futex syscall

3879

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

3881

Case cmd == FUTEX_WAIT_BITSET

3882

Return futex_wait(uaddr, flags, val, timeout, val3)

3883

Case cmd == FUTEX_WAKE

3884

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

3886

Case cmd == FUTEX_WAKE_BITSET

3887

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

3888

Case cmd == FUTEX_REQUEUE

3889

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

3890

Case cmd == FUTEX_CMP_REQUEUE

3891

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

3892

Case cmd == FUTEX_WAKE_OP

3893

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

3894

Case cmd == FUTEX_LOCK_PI

3895

Return 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

Case cmd == FUTEX_UNLOCK_PI

3897

Return 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

Case cmd == FUTEX_TRYLOCK_PI

3899

3900

Case cmd == FUTEX_WAIT_REQUEUE_PI

3901

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

3902

Return 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

Case cmd == FUTEX_CMP_REQUEUE_PI

3905

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

3907

Return -ENOSYS

**Caller**
Name	Describe
SYSCALL_DEFINE6

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion

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