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Diffstat (limited to 'usr/src/lib/libfakekernel/common/sys/mutex.h')
| -rw-r--r-- | usr/src/lib/libfakekernel/common/sys/mutex.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/usr/src/lib/libfakekernel/common/sys/mutex.h b/usr/src/lib/libfakekernel/common/sys/mutex.h new file mode 100644 index 0000000000..ea1e49aea3 --- /dev/null +++ b/usr/src/lib/libfakekernel/common/sys/mutex.h @@ -0,0 +1,100 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright 2013 Nexenta Systems, Inc. All rights reserved. + */ + +#ifndef _SYS_MUTEX_H +#define _SYS_MUTEX_H + +#include <sys/synch.h> /* lwp_mutex_t */ + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * Public interface to mutual exclusion locks. See mutex(9F) for details. + * + * The basic mutex type is MUTEX_ADAPTIVE, which is expected to be used + * in almost all of the kernel. MUTEX_SPIN provides interrupt blocking + * and must be used in interrupt handlers above LOCK_LEVEL. The iblock + * cookie argument to mutex_init() encodes the interrupt level to block. + * The iblock cookie must be NULL for adaptive locks. + * + * MUTEX_DEFAULT is the type usually specified (except in drivers) to + * mutex_init(). It is identical to MUTEX_ADAPTIVE. + * + * MUTEX_DRIVER is always used by drivers. mutex_init() converts this to + * either MUTEX_ADAPTIVE or MUTEX_SPIN depending on the iblock cookie. + * + * Mutex statistics can be gathered on the fly, without rebooting or + * recompiling the kernel, via the lockstat driver (lockstat(7D)). + */ +typedef enum { + MUTEX_ADAPTIVE = 0, /* spin if owner is running, otherwise block */ + MUTEX_SPIN = 1, /* block interrupts and spin */ + MUTEX_DRIVER = 4, /* driver (DDI) mutex */ + MUTEX_DEFAULT = 6 /* kernel default mutex */ +} kmutex_type_t; + +struct _kmutex { + lwp_mutex_t m_lock; + void *m_owner; +}; +typedef struct _kmutex kmutex_t; + +#if defined(_KERNEL) || defined(_FAKE_KERNEL) +/* See the real sys/mutex.h */ +typedef struct pad_mutex { + kmutex_t pad_mutex; +#ifdef _LP64 + char pad_pad[64 - sizeof (kmutex_t)]; +#endif +} pad_mutex_t; +#endif /* _KERNEL */ + +#define MUTEX_HELD(x) (mutex_owned(x)) +#define MUTEX_NOT_HELD(x) (!mutex_owned(x) || panicstr) + +/* + * We're simulating the kernel mutex API here, and the + * user-level has a different signature, so rename. + */ +#define mutex_init kmutex_init +#define mutex_destroy kmutex_destroy + +extern void kmutex_init(kmutex_t *, char *, kmutex_type_t, void *); +extern void kmutex_destroy(kmutex_t *); + +extern void mutex_enter(kmutex_t *); +extern int mutex_tryenter(kmutex_t *); +extern void mutex_exit(kmutex_t *); +extern int mutex_owned(const kmutex_t *); + +extern void *mutex_owner(const kmutex_t *); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_MUTEX_H */ |