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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */#ifndef _UAPI_LINUX_FUTEX_H#define _UAPI_LINUX_FUTEX_H
#include <linux/compiler.h>#include <linux/types.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_LOCK_PI2 13
#define FUTEX_PRIVATE_FLAG 128#define FUTEX_CLOCK_REALTIME 256#define FUTEX_ROBUST_UNLOCK 512#define FUTEX_ROBUST_LIST32 1024
#define FUTEX_CMD_MASK ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME | \ FUTEX_ROBUST_UNLOCK | FUTEX_ROBUST_LIST32)
#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_LOCK_PI2_PRIVATE (FUTEX_LOCK_PI2 | 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)
/* * Operations to unlock a futex, clear the robust list pending op pointer and * wake waiters. */#define FUTEX_UNLOCK_PI_LIST64 (FUTEX_UNLOCK_PI | FUTEX_ROBUST_UNLOCK)#define FUTEX_UNLOCK_PI_LIST64_PRIVATE (FUTEX_UNLOCK_PI_LIST64 | FUTEX_PRIVATE_FLAG)#define FUTEX_UNLOCK_PI_LIST32 (FUTEX_UNLOCK_PI | FUTEX_ROBUST_UNLOCK | \ FUTEX_ROBUST_LIST32)#define FUTEX_UNLOCK_PI_LIST32_PRIVATE (FUTEX_UNLOCK_PI_LIST32 | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_WAKE_LIST64 (FUTEX_WAKE | FUTEX_ROBUST_UNLOCK)#define FUTEX_UNLOCK_WAKE_LIST64_PRIVATE (FUTEX_UNLOCK_WAKE_LIST64 | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_WAKE_LIST32 (FUTEX_WAKE | FUTEX_ROBUST_UNLOCK | \ FUTEX_ROBUST_LIST32)#define FUTEX_UNLOCK_WAKE_LIST32_PRIVATE (FUTEX_UNLOCK_WAKE_LIST32 | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_BITSET_LIST64 (FUTEX_WAKE_BITSET | FUTEX_ROBUST_UNLOCK)#define FUTEX_UNLOCK_BITSET_LIST64_PRIVATE (FUTEX_UNLOCK_BITSET_LIST64 | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_BITSET_LIST32 (FUTEX_WAKE_BITSET | FUTEX_ROBUST_UNLOCK | \ FUTEX_ROBUST_LIST32)#define FUTEX_UNLOCK_BITSET_LIST32_PRIVATE (FUTEX_UNLOCK_BITSET_LIST32 | FUTEX_PRIVATE_FLAG)
/* * Flags for futex2 syscalls. * * NOTE: these are not pure flags, they can also be seen as: * * union { * u32 flags; * struct { * u32 size : 2, * numa : 1, * : 4, * private : 1; * }; * }; */#define FUTEX2_SIZE_U8 0x00#define FUTEX2_SIZE_U16 0x01#define FUTEX2_SIZE_U32 0x02#define FUTEX2_SIZE_U64 0x03#define FUTEX2_NUMA 0x04#define FUTEX2_MPOL 0x08 /* 0x10 */ /* 0x20 */ /* 0x40 */#define FUTEX2_PRIVATE FUTEX_PRIVATE_FLAG
#define FUTEX2_SIZE_MASK 0x03
/* do not use */#define FUTEX_32 FUTEX2_SIZE_U32 /* historical accident :-( */
/* * When FUTEX2_NUMA doubles the futex word, the second word is a node value. * The special value -1 indicates no-node. This is the same value as * NUMA_NO_NODE, except that value is not ABI, this is. */#define FUTEX_NO_NODE (-1)
/* * Max numbers of elements in a futex_waitv array */#define FUTEX_WAITV_MAX 128
/** * struct futex_waitv - A waiter for vectorized wait * @val: Expected value at uaddr * @uaddr: User address to wait on * @flags: Flags for this waiter * @__reserved: Reserved member to preserve data alignment. Should be 0. */struct futex_waitv { __u64 val; __u64 uaddr; __u32 flags; __u32 __reserved;};
/* * 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
/* Modifiers for robust_list_head::list_op_pending */#define FUTEX_ROBUST_MOD_PI (0x1UL)#define FUTEX_ROBUST_MOD_MASK (FUTEX_ROBUST_MOD_PI)
/* * bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a * match of any bit. */#define FUTEX_BITSET_MATCH_ANY 0xffffffff
#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 /* _UAPI_LINUX_FUTEX_H */