#ifndef _LINUX_FUTEX_H
#define _LINUX_FUTEX_H
-#include <linux/compiler.h>
-#include <linux/types.h>
+#include <uapi/linux/futex.h>
-/* Second argument to futex syscall */
-
-
-#define FUTEX_WAIT 0
-#define FUTEX_WAKE 1
-#define FUTEX_FD 2
-#define FUTEX_REQUEUE 3
-#define FUTEX_CMP_REQUEUE 4
-#define FUTEX_WAKE_OP 5
-#define FUTEX_LOCK_PI 6
-#define FUTEX_UNLOCK_PI 7
-#define FUTEX_TRYLOCK_PI 8
-#define FUTEX_WAIT_BITSET 9
-#define FUTEX_WAKE_BITSET 10
-#define FUTEX_WAIT_REQUEUE_PI 11
-#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_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)
-#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)
-#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)
-
-/*
- * Support for robust futexes: the kernel cleans up held futexes at
- * thread exit time.
- */
-
-/*
- * Per-lock list entry - embedded in user-space locks, somewhere close
- * to the futex field. (Note: user-space uses a double-linked list to
- * achieve O(1) list add and remove, but the kernel only needs to know
- * about the forward link)
- *
- * NOTE: this structure is part of the syscall ABI, and must not be
- * changed.
- */
-struct robust_list {
- struct robust_list __user *next;
-};
-
-/*
- * Per-thread list head:
- *
- * NOTE: this structure is part of the syscall ABI, and must only be
- * changed if the change is first communicated with the glibc folks.
- * (When an incompatible change is done, we'll increase the structure
- * size, which glibc will detect)
- */
-struct robust_list_head {
- /*
- * The head of the list. Points back to itself if empty:
- */
- struct robust_list list;
-
- /*
- * This relative offset is set by user-space, it gives the kernel
- * the relative position of the futex field to examine. This way
- * we keep userspace flexible, to freely shape its data-structure,
- * without hardcoding any particular offset into the kernel:
- */
- long futex_offset;
-
- /*
- * The death of the thread may race with userspace setting
- * up a lock's links. So to handle this race, userspace first
- * sets this field to the address of the to-be-taken lock,
- * then does the lock acquire, and then adds itself to the
- * list, and then clears this field. Hence the kernel will
- * always have full knowledge of all locks that the thread
- * _might_ have taken. We check the owner TID in any case,
- * so only truly owned locks will be handled.
- */
- struct robust_list __user *list_op_pending;
-};
-
-/*
- * Are there any waiters for this robust futex:
- */
-#define FUTEX_WAITERS 0x80000000
-
-/*
- * 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:
- */
-#define FUTEX_OWNER_DIED 0x40000000
-
-/*
- * The rest of the robust-futex field is for the TID:
- */
-#define FUTEX_TID_MASK 0x3fffffff
-
-/*
- * This limit protects against a deliberately circular list.
- * (Not worth introducing an rlimit for it)
- */
-#define ROBUST_LIST_LIMIT 2048
-
-/*
- * bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a
- * match of any bit.
- */
-#define FUTEX_BITSET_MATCH_ANY 0xffffffff
-
-#ifdef __KERNEL__
struct inode;
struct mm_struct;
struct task_struct;
{
}
#endif
-#endif /* __KERNEL__ */
-
-#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */
-#define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */
-#define FUTEX_OP_OR 2 /* *(int *)UADDR2 |= OPARG; */
-#define FUTEX_OP_ANDN 3 /* *(int *)UADDR2 &= ~OPARG; */
-#define FUTEX_OP_XOR 4 /* *(int *)UADDR2 ^= OPARG; */
-
-#define FUTEX_OP_OPARG_SHIFT 8 /* Use (1 << OPARG) instead of OPARG. */
-
-#define FUTEX_OP_CMP_EQ 0 /* if (oldval == CMPARG) wake */
-#define FUTEX_OP_CMP_NE 1 /* if (oldval != CMPARG) wake */
-#define FUTEX_OP_CMP_LT 2 /* if (oldval < CMPARG) wake */
-#define FUTEX_OP_CMP_LE 3 /* if (oldval <= CMPARG) wake */
-#define FUTEX_OP_CMP_GT 4 /* if (oldval > CMPARG) wake */
-#define FUTEX_OP_CMP_GE 5 /* if (oldval >= CMPARG) wake */
-
-/* FUTEX_WAKE_OP will perform atomically
- int oldval = *(int *)UADDR2;
- *(int *)UADDR2 = oldval OP OPARG;
- if (oldval CMP CMPARG)
- wake UADDR2; */
-
-#define FUTEX_OP(op, oparg, cmp, cmparg) \
- (((op & 0xf) << 28) | ((cmp & 0xf) << 24) \
- | ((oparg & 0xfff) << 12) | (cmparg & 0xfff))
-
#endif
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