4ab080249a
dereference curthread. It is called only from critical_{enter,exit}(),
which already dereferences curthread. This doesn't seem to affect SMP
performance in my benchmarks, but improves MySQL transaction throughput
by about 1% on UP on my Xeon.
Head nodding: jhb, bmilekic
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*-
|
|
* Copyright (c) 2002 Matthew Dillon. All Rights Reserved.
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
|
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* This file contains prototypes and high-level inlines related to
|
|
* machine-level critical function support:
|
|
*
|
|
* cpu_critical_enter() - inlined
|
|
* cpu_critical_exit() - inlined
|
|
* cpu_critical_fork_exit() - prototyped
|
|
* related support functions residing
|
|
* in <arch>/<arch>/critical.c - prototyped
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_CRITICAL_H_
|
|
#define _MACHINE_CRITICAL_H_
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/*
|
|
* Prototypes - see <arch>/<arch>/critical.c
|
|
*/
|
|
void cpu_critical_fork_exit(void);
|
|
|
|
#ifdef __GNUC__
|
|
|
|
/*
|
|
* cpu_critical_enter:
|
|
*
|
|
* This routine is called from critical_enter() on the 0->1 transition
|
|
* of td_critnest, prior to it being incremented to 1.
|
|
*/
|
|
static __inline void
|
|
cpu_critical_enter(struct thread *td)
|
|
{
|
|
|
|
td->td_md.md_savecrit = intr_disable();
|
|
}
|
|
|
|
/*
|
|
* cpu_critical_exit:
|
|
*
|
|
* This routine is called from critical_exit() on a 1->0 transition
|
|
* of td_critnest, after it has been decremented to 0. We are
|
|
* exiting the last critical section.
|
|
*/
|
|
static __inline void
|
|
cpu_critical_exit(struct thread *td)
|
|
{
|
|
intr_restore(td->td_md.md_savecrit);
|
|
}
|
|
|
|
#else /* !__GNUC__ */
|
|
|
|
void cpu_critical_enter(struct thread *td);
|
|
void cpu_critical_exit(struct thread *td);
|
|
|
|
#endif /* __GNUC__ */
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* !_MACHINE_CRITICAL_H_ */
|
|
|