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93 lines
2.4 KiB
93 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_FUTEX_H |
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#define _LINUX_FUTEX_H |
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#include <linux/sched.h> |
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#include <linux/ktime.h> |
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#include <uapi/linux/futex.h> |
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struct inode; |
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struct mm_struct; |
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struct task_struct; |
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/* |
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* Futexes are matched on equal values of this key. |
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* The key type depends on whether it's a shared or private mapping. |
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* Don't rearrange members without looking at hash_futex(). |
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* |
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* offset is aligned to a multiple of sizeof(u32) (== 4) by definition. |
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* We use the two low order bits of offset to tell what is the kind of key : |
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* 00 : Private process futex (PTHREAD_PROCESS_PRIVATE) |
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* (no reference on an inode or mm) |
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* 01 : Shared futex (PTHREAD_PROCESS_SHARED) |
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* mapped on a file (reference on the underlying inode) |
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* 10 : Shared futex (PTHREAD_PROCESS_SHARED) |
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* (but private mapping on an mm, and reference taken on it) |
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*/ |
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#define FUT_OFF_INODE 1 /* We set bit 0 if key has a reference on inode */ |
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#define FUT_OFF_MMSHARED 2 /* We set bit 1 if key has a reference on mm */ |
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union futex_key { |
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struct { |
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u64 i_seq; |
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unsigned long pgoff; |
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unsigned int offset; |
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} shared; |
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struct { |
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union { |
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struct mm_struct *mm; |
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u64 __tmp; |
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}; |
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unsigned long address; |
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unsigned int offset; |
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} private; |
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struct { |
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u64 ptr; |
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unsigned long word; |
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unsigned int offset; |
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} both; |
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}; |
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#define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = 0ULL } } |
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#ifdef CONFIG_FUTEX |
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enum { |
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FUTEX_STATE_OK, |
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FUTEX_STATE_EXITING, |
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FUTEX_STATE_DEAD, |
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}; |
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static inline void futex_init_task(struct task_struct *tsk) |
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{ |
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tsk->robust_list = NULL; |
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#ifdef CONFIG_COMPAT |
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tsk->compat_robust_list = NULL; |
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#endif |
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INIT_LIST_HEAD(&tsk->pi_state_list); |
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tsk->pi_state_cache = NULL; |
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tsk->futex_state = FUTEX_STATE_OK; |
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mutex_init(&tsk->futex_exit_mutex); |
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} |
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void futex_exit_recursive(struct task_struct *tsk); |
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void futex_exit_release(struct task_struct *tsk); |
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void futex_exec_release(struct task_struct *tsk); |
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long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout, |
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u32 __user *uaddr2, u32 val2, u32 val3); |
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#else |
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static inline void futex_init_task(struct task_struct *tsk) { } |
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static inline void futex_exit_recursive(struct task_struct *tsk) { } |
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static inline void futex_exit_release(struct task_struct *tsk) { } |
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static inline void futex_exec_release(struct task_struct *tsk) { } |
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static inline long do_futex(u32 __user *uaddr, int op, u32 val, |
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ktime_t *timeout, u32 __user *uaddr2, |
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u32 val2, u32 val3) |
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{ |
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return -EINVAL; |
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} |
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#endif |
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#endif
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