linux/arch/um/include/shared/sigio.h
Tiwei Bie 33c9da5dfb um: Rewrite the sigio workaround based on epoll and tgkill
The existing sigio workaround implementation removes FDs from the
poll when events are triggered, requiring users to re-add them via
add_sigio_fd() after processing. This introduces a potential race
condition between FD removal in write_sigio_thread() and next_poll
update in __add_sigio_fd(), and is inefficient due to frequent FD
removal and re-addition. Rewrite the implementation based on epoll
and tgkill for improved efficiency and reliability.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20250315161910.4082396-2-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2025-03-20 09:28:44 +01:00

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C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
*/
#ifndef __SIGIO_H__
#define __SIGIO_H__
extern void sigio_lock(void);
extern void sigio_unlock(void);
#endif