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what Linux does. This is because robust futexes are mostly userspace thing which we cannot alter. Two syscalls maintain pointer to userspace list and when process exits a routine walks this list waking up processes sleeping on futexes from that list. Reviewed by: kib (mentor) MFC after: 1 month
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/*-
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* Copyright (c) 2006 Roman Divacky
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_EMUL_H_
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#define _LINUX_EMUL_H_
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#include <compat/linux/linux_futex.h>
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struct linux_emuldata_shared {
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int refs;
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pid_t group_pid;
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LIST_HEAD(, linux_emuldata) threads; /* head of list of linux threads */
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};
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/*
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* modeled after similar structure in NetBSD
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* this will be extended as we need more functionality
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*/
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struct linux_emuldata {
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pid_t pid;
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int *child_set_tid; /* in clone(): Child's TID to set on clone */
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int *child_clear_tid;/* in clone(): Child's TID to clear on exit */
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struct linux_emuldata_shared *shared;
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int pdeath_signal; /* parent death signal */
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struct linux_robust_list_head *robust_futexes;
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LIST_ENTRY(linux_emuldata) threads; /* list of linux threads */
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};
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struct linux_emuldata *em_find(struct proc *, int locked);
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#define EMUL_LOCK(l) mtx_lock(l)
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#define EMUL_UNLOCK(l) mtx_unlock(l)
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#define EMUL_SHARED_RLOCK(l) sx_slock(l)
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#define EMUL_SHARED_RUNLOCK(l) sx_sunlock(l)
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#define EMUL_SHARED_WLOCK(l) sx_xlock(l)
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#define EMUL_SHARED_WUNLOCK(l) sx_xunlock(l)
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/* for em_find use */
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#define EMUL_DOLOCK 1
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#define EMUL_DONTLOCK 0
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int linux_proc_init(struct thread *, pid_t, int);
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void linux_proc_exit(void *, struct proc *);
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void linux_schedtail(void *, struct proc *);
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void linux_proc_exec(void *, struct proc *, struct image_params *);
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extern struct sx emul_shared_lock;
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extern struct mtx emul_lock;
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#endif /* !_LINUX_EMUL_H_ */
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