c3f8e2ee55
hint pointer, but do so in a way that remains compatible with older pthread libraries. This can be used to wake another thread before the calling thread goes asleep, saving at least one syscall + involuntary context switch. This turns out to be a fairly large win on the condvar benchmarks that I have tried.
67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/* $NetBSD: lwp.h,v 1.7 2007/08/07 19:04:21 ad Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan Williams.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LWP_H_
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#define _LWP_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/ucontext.h>
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#include <sys/time.h>
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__BEGIN_DECLS
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lwpid_t _lwp_self(void);
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int _lwp_create(const ucontext_t *, unsigned long, lwpid_t *);
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int _lwp_exit(void);
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int _lwp_wait(lwpid_t, lwpid_t *);
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int _lwp_suspend(lwpid_t);
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int _lwp_continue(lwpid_t);
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int _lwp_wakeup(lwpid_t);
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void _lwp_makecontext(ucontext_t *, void (*)(void *), void *, void *,
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caddr_t, size_t);
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void *_lwp_getprivate(void);
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void _lwp_setprivate(void *);
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int _lwp_kill(lwpid_t, int);
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int _lwp_detach(lwpid_t);
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int _lwp_park(const struct timespec *, lwpid_t, const void *, const void *);
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int _lwp_unpark(lwpid_t, const void *);
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ssize_t _lwp_unpark_all(const lwpid_t *, size_t, const void *);
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__END_DECLS
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#endif /* !_LWP_H_ */
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