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author | orivej <orivej@yandex-team.ru> | 2022-02-10 16:44:49 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:44:49 +0300 |
commit | 718c552901d703c502ccbefdfc3c9028d608b947 (patch) | |
tree | 46534a98bbefcd7b1f3faa5b52c138ab27db75b7 /contrib/libs/linux-headers/linux/futex.h | |
parent | e9656aae26e0358d5378e5b63dcac5c8dbe0e4d0 (diff) | |
download | ydb-718c552901d703c502ccbefdfc3c9028d608b947.tar.gz |
Restoring authorship annotation for <orivej@yandex-team.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/libs/linux-headers/linux/futex.h')
-rw-r--r-- | contrib/libs/linux-headers/linux/futex.h | 306 |
1 files changed, 153 insertions, 153 deletions
diff --git a/contrib/libs/linux-headers/linux/futex.h b/contrib/libs/linux-headers/linux/futex.h index c5df51e9f84..99941241b98 100644 --- a/contrib/libs/linux-headers/linux/futex.h +++ b/contrib/libs/linux-headers/linux/futex.h @@ -1,153 +1,153 @@ -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ -#ifndef _LINUX_FUTEX_H -#define _LINUX_FUTEX_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_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 *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 *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 - - -#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 /* _LINUX_FUTEX_H */ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _LINUX_FUTEX_H +#define _LINUX_FUTEX_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_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 *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 *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 + + +#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 /* _LINUX_FUTEX_H */ |