common upgrades
Change-Id: I567fc15845b601019d346569ecfcef4f89687fd2
This commit is contained in:
216
include/sys/mutex.h
Normal file
216
include/sys/mutex.h
Normal file
@@ -0,0 +1,216 @@
|
||||
/* $NetBSD: mutex.h,v 1.20 2010/02/08 09:54:27 skrll Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 2002, 2006, 2007, 2008, 2009 The NetBSD Foundation, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to The NetBSD Foundation
|
||||
* by Jason R. Thorpe and Andrew Doran.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||||
* ``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 FOUNDATION OR CONTRIBUTORS
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef _SYS_MUTEX_H_
|
||||
#define _SYS_MUTEX_H_
|
||||
|
||||
/*
|
||||
* There are 2 types of mutexes:
|
||||
*
|
||||
* * Adaptive -- If the lock is already held, the thread attempting
|
||||
* to acquire the lock determines if the thread that holds it is
|
||||
* currently running. If so, it spins, else it sleeps.
|
||||
*
|
||||
* * Spin -- If the lock is already held, the thread attempting to
|
||||
* acquire the lock spins. The IPL will be raised on entry.
|
||||
*
|
||||
* Machine dependent code must provide the following:
|
||||
*
|
||||
* struct mutex
|
||||
* The actual mutex structure. This structure is mostly
|
||||
* opaque to machine-independent code; most access are done
|
||||
* through macros. However, machine-independent code must
|
||||
* be able to access the following members:
|
||||
*
|
||||
* uintptr_t mtx_owner
|
||||
* ipl_cookie_t mtx_ipl
|
||||
* __cpu_simple_lock_t mtx_lock
|
||||
*
|
||||
* If an architecture can be considered 'simple' (no interlock required in
|
||||
* the MP case, or no MP) it need only define __HAVE_SIMPLE_MUTEXES and
|
||||
* provide the following:
|
||||
*
|
||||
* struct mutex
|
||||
*
|
||||
* [additionally:]
|
||||
* volatile integer mtx_id
|
||||
*
|
||||
* MUTEX_RECEIVE(mtx)
|
||||
* Post a load fence after acquiring the mutex, if necessary.
|
||||
*
|
||||
* MUTEX_GIVE(mtx)
|
||||
* Post a load/store fence after releasing the mutex, if
|
||||
* necessary.
|
||||
*
|
||||
* MUTEX_CAS(ptr, old, new)
|
||||
* Perform an atomic "compare and swap" operation and
|
||||
* evaluate to true or false according to the success
|
||||
*
|
||||
* Otherwise, the following must be defined:
|
||||
*
|
||||
* MUTEX_INITIALIZE_SPIN(mtx, dodebug, minipl)
|
||||
* Initialize a spin mutex.
|
||||
*
|
||||
* MUTEX_INITIALIZE_ADAPTIVE(mtx, dodebug)
|
||||
* Initialize an adaptive mutex.
|
||||
*
|
||||
* MUTEX_DESTROY(mtx)
|
||||
* Tear down a mutex.
|
||||
*
|
||||
* MUTEX_ADAPTIVE_P(mtx)
|
||||
* Evaluates to true if the mutex is an adaptive mutex.
|
||||
*
|
||||
* MUTEX_SPIN_P(mtx)
|
||||
* Evaluates to true if the mutex is a spin mutex.
|
||||
*
|
||||
* MUTEX_OWNER(owner)
|
||||
* Returns the owner of the adaptive mutex (LWP address).
|
||||
*
|
||||
* MUTEX_OWNED(owner)
|
||||
* Returns non-zero if an adaptive mutex is currently
|
||||
* held by an LWP.
|
||||
*
|
||||
* MUTEX_HAS_WAITERS(mtx)
|
||||
* Returns true if the mutex has waiters.
|
||||
*
|
||||
* MUTEX_SET_WAITERS(mtx)
|
||||
* Mark the mutex has having waiters.
|
||||
*
|
||||
* MUTEX_ACQUIRE(mtx, owner)
|
||||
* Try to acquire an adaptive mutex such that:
|
||||
* if (lock held OR waiters)
|
||||
* return 0;
|
||||
* else
|
||||
* return 1;
|
||||
* Must be MP/interrupt atomic.
|
||||
*
|
||||
* MUTEX_RELEASE(mtx)
|
||||
* Release the lock and clear the "has waiters" indication.
|
||||
* Must be interrupt atomic, need not be MP safe.
|
||||
*
|
||||
* MUTEX_DEBUG_P(mtx)
|
||||
* Evaluates to true if the mutex is initialized with
|
||||
* dodebug==true. Only used in the LOCKDEBUG case.
|
||||
*
|
||||
* Machine dependent code may optionally provide stubs for the following
|
||||
* functions to implement the easy (unlocked / no waiters) cases. If
|
||||
* these stubs are provided, __HAVE_MUTEX_STUBS should be defined.
|
||||
*
|
||||
* mutex_enter()
|
||||
* mutex_exit()
|
||||
*
|
||||
* Two additional stubs may be implemented that handle only the spinlock
|
||||
* case, primarily for the scheduler. __HAVE_SPIN_MUTEX_STUBS should be
|
||||
* defined if these are provided:
|
||||
*
|
||||
* mutex_spin_enter()
|
||||
* mutex_spin_exit()
|
||||
*/
|
||||
|
||||
#if defined(_KERNEL_OPT)
|
||||
#include "opt_lockdebug.h"
|
||||
#endif
|
||||
|
||||
#if !defined(_KERNEL)
|
||||
#include <sys/types.h>
|
||||
#include <sys/inttypes.h>
|
||||
#endif
|
||||
|
||||
typedef enum kmutex_type_t {
|
||||
MUTEX_SPIN = 0, /* To get a spin mutex at IPL_NONE */
|
||||
MUTEX_ADAPTIVE = 1, /* For porting code written for Solaris */
|
||||
MUTEX_DEFAULT = 2, /* The only native, endorsed type */
|
||||
MUTEX_DRIVER = 3, /* For porting code written for Solaris */
|
||||
MUTEX_NODEBUG = 4 /* Disables LOCKDEBUG; use with care */
|
||||
} kmutex_type_t;
|
||||
|
||||
typedef struct kmutex kmutex_t;
|
||||
|
||||
#if defined(__MUTEX_PRIVATE)
|
||||
|
||||
#define MUTEX_THREAD ((uintptr_t)-16L)
|
||||
|
||||
#define MUTEX_BIT_SPIN 0x01
|
||||
#define MUTEX_BIT_WAITERS 0x02
|
||||
|
||||
#if defined(LOCKDEBUG)
|
||||
#define MUTEX_BIT_NODEBUG 0x04 /* LOCKDEBUG disabled */
|
||||
#else
|
||||
#define MUTEX_BIT_NODEBUG 0x00 /* do nothing */
|
||||
#endif /* LOCKDEBUG */
|
||||
|
||||
#define MUTEX_SPIN_IPL(mtx) ((mtx)->mtx_ipl)
|
||||
#define MUTEX_SPIN_OLDSPL(ci) ((ci)->ci_mtx_oldspl)
|
||||
|
||||
void mutex_vector_enter(kmutex_t *);
|
||||
void mutex_vector_exit(kmutex_t *);
|
||||
void mutex_spin_retry(kmutex_t *);
|
||||
void mutex_wakeup(kmutex_t *);
|
||||
|
||||
#endif /* __MUTEX_PRIVATE */
|
||||
|
||||
#ifdef _KERNEL
|
||||
#include <sys/intr.h>
|
||||
#endif
|
||||
|
||||
#include <machine/mutex.h>
|
||||
|
||||
/*
|
||||
* Return true if no spin mutexes are held by the current CPU.
|
||||
*/
|
||||
#ifndef MUTEX_NO_SPIN_ACTIVE_P
|
||||
#define MUTEX_NO_SPIN_ACTIVE_P(ci) ((ci)->ci_mtx_count == 0)
|
||||
#endif
|
||||
|
||||
#ifdef _KERNEL
|
||||
|
||||
void mutex_init(kmutex_t *, kmutex_type_t, int);
|
||||
void mutex_destroy(kmutex_t *);
|
||||
|
||||
void mutex_enter(kmutex_t *);
|
||||
void mutex_exit(kmutex_t *);
|
||||
|
||||
void mutex_spin_enter(kmutex_t *);
|
||||
void mutex_spin_exit(kmutex_t *);
|
||||
|
||||
int mutex_tryenter(kmutex_t *);
|
||||
|
||||
int mutex_owned(kmutex_t *);
|
||||
lwp_t *mutex_owner(kmutex_t *);
|
||||
|
||||
void mutex_obj_init(void);
|
||||
kmutex_t *mutex_obj_alloc(kmutex_type_t, int);
|
||||
void mutex_obj_hold(kmutex_t *);
|
||||
bool mutex_obj_free(kmutex_t *);
|
||||
|
||||
#endif /* _KERNEL */
|
||||
|
||||
#endif /* _SYS_MUTEX_H_ */
|
||||
Reference in New Issue
Block a user