85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/*
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* Copyright (c) 2015
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* The President and Fellows of Harvard College.
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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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* 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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef HANGMAN_H
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#define HANGMAN_H
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/*
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* Simple deadlock detector. Enable with "options hangman" in the
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* kernel config.
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*/
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#include "opt-hangman.h"
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#if OPT_HANGMAN
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struct hangman_actor {
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const char *a_name;
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const struct hangman_lockable *a_waiting;
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};
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struct hangman_lockable {
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const char *l_name;
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const struct hangman_actor *l_holding;
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};
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void hangman_wait(struct hangman_actor *a, struct hangman_lockable *l);
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void hangman_acquire(struct hangman_actor *a, struct hangman_lockable *l);
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void hangman_release(struct hangman_actor *a, struct hangman_lockable *l);
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#define HANGMAN_ACTOR(sym) struct hangman_actor sym
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#define HANGMAN_LOCKABLE(sym) struct hangman_lockable sym
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#define HANGMAN_ACTORINIT(a, n) ((a)->a_name = (n), (a)->a_waiting = NULL)
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#define HANGMAN_LOCKABLEINIT(l, n) ((l)->l_name = (n), (l)->l_holding = NULL)
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#define HANGMAN_LOCKABLE_INITIALIZER { "spinlock", NULL }
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#define HANGMAN_WAIT(a, l) hangman_wait(a, l)
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#define HANGMAN_ACQUIRE(a, l) hangman_acquire(a, l)
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#define HANGMAN_RELEASE(a, l) hangman_release(a, l)
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#else
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#define HANGMAN_ACTOR(sym)
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#define HANGMAN_LOCKABLE(sym)
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#define HANGMAN_ACTORINIT(a, name)
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#define HANGMAN_LOCKABLEINIT(a, name)
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#define HANGMAN_LOCKABLE_INITIALIZER
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#define HANGMAN_WAIT(a, l)
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#define HANGMAN_ACQUIRE(a, l)
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#define HANGMAN_RELEASE(a, l)
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#endif
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#endif /* HANGMAN_H */
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