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a138179a59
NT waits can optionally be made "alertable". This is a special channel for thread wakeup that is mildly similar to SIGIO. A thread has an internal single bit of "alerted" state, and if a thread is alerted while an alertable wait, the wait will return a special value, consume the "alerted" state, and will not consume any of its objects. Alerts are implemented using events; the user-space NT emulator is expected to create an internal ntsync event for each thread and pass that event to wait functions. Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20241213193511.457338-16-zfigura@codeweavers.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Kernel support for NT synchronization primitive emulation
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*
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* Copyright (C) 2021-2022 Elizabeth Figura <zfigura@codeweavers.com>
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*/
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#ifndef __LINUX_NTSYNC_H
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#define __LINUX_NTSYNC_H
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#include <linux/types.h>
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struct ntsync_sem_args {
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__u32 count;
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__u32 max;
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};
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struct ntsync_mutex_args {
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__u32 owner;
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__u32 count;
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};
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struct ntsync_event_args {
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__u32 manual;
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__u32 signaled;
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};
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#define NTSYNC_WAIT_REALTIME 0x1
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struct ntsync_wait_args {
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__u64 timeout;
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__u64 objs;
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__u32 count;
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__u32 index;
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__u32 flags;
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__u32 owner;
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__u32 alert;
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__u32 pad;
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};
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#define NTSYNC_MAX_WAIT_COUNT 64
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#define NTSYNC_IOC_CREATE_SEM _IOW ('N', 0x80, struct ntsync_sem_args)
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#define NTSYNC_IOC_WAIT_ANY _IOWR('N', 0x82, struct ntsync_wait_args)
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#define NTSYNC_IOC_WAIT_ALL _IOWR('N', 0x83, struct ntsync_wait_args)
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#define NTSYNC_IOC_CREATE_MUTEX _IOW ('N', 0x84, struct ntsync_mutex_args)
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#define NTSYNC_IOC_CREATE_EVENT _IOW ('N', 0x87, struct ntsync_event_args)
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#define NTSYNC_IOC_SEM_RELEASE _IOWR('N', 0x81, __u32)
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#define NTSYNC_IOC_MUTEX_UNLOCK _IOWR('N', 0x85, struct ntsync_mutex_args)
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#define NTSYNC_IOC_MUTEX_KILL _IOW ('N', 0x86, __u32)
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#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32)
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#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
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#define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32)
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#define NTSYNC_IOC_SEM_READ _IOR ('N', 0x8b, struct ntsync_sem_args)
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#define NTSYNC_IOC_MUTEX_READ _IOR ('N', 0x8c, struct ntsync_mutex_args)
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#define NTSYNC_IOC_EVENT_READ _IOR ('N', 0x8d, struct ntsync_event_args)
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#endif
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