b1b7862792
interlock. This is applicable in cases where the actual interlock is the CPU the currently running thread is scheduled on. Borrowing the scheduler lock as the mutex mandated by pthread_cond_wait() does away with need to have an additional mutex. This both optimizes runtime execution and simplifies code, as the extra lock typically lead to quite some trickeries to avoid the dungeon collapsing due to zaps from the wand of deadlock.
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* $NetBSD: rumpuser_int.h,v 1.3 2010/05/18 14:58:41 pooka Exp $ */
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/*
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* Copyright (c) 2008 Antti Kantee. 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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 OR
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* 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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#include <stdlib.h>
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#include <rump/rumpuser.h>
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extern kernel_lockfn rumpuser__klock;
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extern kernel_unlockfn rumpuser__kunlock;
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extern int rumpuser__wantthreads;
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#define KLOCK_WRAP(a) \
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do { \
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int nlocks; \
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rumpuser__kunlock(0, &nlocks, NULL); \
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a; \
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rumpuser__klock(nlocks, NULL); \
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} while (/*CONSTCOND*/0)
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#define DOCALL(rvtype, call) \
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{ \
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rvtype rv; \
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rv = call; \
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if (rv == -1) \
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*error = errno; \
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else \
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*error = 0; \
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return rv; \
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}
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#define DOCALL_KLOCK(rvtype, call) \
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{ \
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rvtype rv; \
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int nlocks; \
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rumpuser__kunlock(0, &nlocks, NULL); \
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rv = call; \
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rumpuser__klock(nlocks, NULL); \
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if (rv == -1) \
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*error = errno; \
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else \
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*error = 0; \
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return rv; \
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}
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