usr/src/uts/common/sys/synch.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_SYNCH_H
  28 #define _SYS_SYNCH_H
  29
  30 #ifndef _ASM
  31 #include <sys/types.h>
  32 #include <sys/int_types.h>
  33 #endif /* _ASM */
  34
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 #ifndef _ASM
  40 /*
  41  * Thread and LWP mutexes have the same type
  42  * definitions.
  43  *
  44  * NOTE:
  45  *
  46  * POSIX requires that <pthread.h> define the structures pthread_mutex_t
  47  * and pthread_cond_t.  Although these structures are identical to mutex_t
  48  * (lwp_mutex_t) and cond_t (lwp_cond_t), defined here, a typedef of these
  49  * types would require including <synch.h> in <pthread.h>, pulling in
  50  * non-posix symbols/constants, violating POSIX namespace restrictions.  Hence,
  51  * pthread_mutex_t/pthread_cond_t have been redefined (in <sys/types.h>).
  52  * Any modifications done to mutex_t/lwp_mutex_t or cond_t/lwp_cond_t must
  53  * also be done to pthread_mutex_t/pthread_cond_t.
  54  */
  55 typedef struct _lwp_mutex {
  56         struct {
  57                 uint16_t        flag1;
  58                 uint8_t         flag2;
  59                 uint8_t         ceiling;
  60                 union {
  61                         uint16_t bcptype;
  62                         struct {
  63                                 uint8_t count_type1;
  64                                 uint8_t count_type2;
  65                         } mtype_rcount;
  66                 } mbcp_type_un;
  67                 uint16_t        magic;
  68         } flags;
  69         union {
  70                 struct {
  71                         uint8_t pad[8];
  72                 } lock64;
  73                 struct {
  74                         uint32_t ownerpid;
  75                         uint32_t lockword;
  76                 } lock32;
  77                 upad64_t owner64;
  78         } lock;
  79         upad64_t data;
  80 } lwp_mutex_t;
  81
  82 /*
  83  * Thread and LWP condition variables have the same
  84  * type definition.
  85  * NOTE:
  86  * The layout of the following structure should be kept in sync with the
  87  * layout of pthread_cond_t in sys/types.h. See NOTE above for lwp_mutex_t.
  88  */
  89 typedef struct _lwp_cond {
  90         struct {
  91                 uint8_t         flag[4];
  92                 uint16_t        type;
  93                 uint16_t        magic;
  94         } flags;
  95         upad64_t data;
  96 } lwp_cond_t;
  97
  98 /*
  99  * LWP semaphores
 100  */
 101 typedef struct _lwp_sema {
 102         uint32_t        count;          /* semaphore count */
 103         uint16_t        type;
 104         uint16_t        magic;
 105         uint8_t         flags[8];       /* last byte reserved for waiters */
 106         upad64_t        data;           /* optional data */
 107 } lwp_sema_t;
 108
 109 /*
 110  * Thread and LWP rwlocks have the same type definition.
 111  * NOTE: The layout of this structure should be kept in sync with the layout
 112  * of the correponding structure of pthread_rwlock_t in sys/types.h.
 113  * Also, because we have to deal with C++, there is an identical structure
 114  * for rwlock_t in head/sync.h that we cannot change.
 115  */
 116 typedef struct _lwp_rwlock {
 117         int32_t         readers;        /* rwstate word */
 118         uint16_t        type;
 119         uint16_t        magic;
 120         lwp_mutex_t     mutex;          /* used with process-shared rwlocks */
 121         lwp_cond_t      readercv;       /* used only to indicate ownership */
 122         lwp_cond_t      writercv;       /* used only to indicate ownership */
 123 } lwp_rwlock_t;
 124
 125 #endif /* _ASM */
 126 /*
 127  * Definitions of synchronization types.
 128  */
 129 #define USYNC_THREAD    0x00            /* private to a process */
 130 #define USYNC_PROCESS   0x01            /* shared by processes */
 131
 132 /* Keep the following values in sync with pthread.h */
 133 #define LOCK_NORMAL             0x00            /* same as USYNC_THREAD */
 134 #define LOCK_SHARED             0x01            /* same as USYNC_PROCESS */
 135 #define LOCK_ERRORCHECK         0x02            /* error check lock */
 136 #define LOCK_RECURSIVE          0x04            /* recursive lock */
 137 #define LOCK_PRIO_INHERIT       0x10            /* priority inheritance lock */
 138 #define LOCK_PRIO_PROTECT       0x20            /* priority ceiling lock */
 139 #define LOCK_ROBUST             0x40            /* robust lock */
 140
 141 /*
 142  * USYNC_PROCESS_ROBUST is a deprecated historical type.  It is mapped
 143  * into (USYNC_PROCESS | LOCK_ROBUST) by mutex_init().  Application code
 144  * should be revised to use (USYNC_PROCESS | LOCK_ROBUST) rather than this.
 145  */
 146 #define USYNC_PROCESS_ROBUST    0x08
 147
 148 /*
 149  * lwp_mutex_t flags
 150  */
 151 #define LOCK_OWNERDEAD          0x1
 152 #define LOCK_NOTRECOVERABLE     0x2
 153 #define LOCK_INITED             0x4
 154 #define LOCK_UNMAPPED           0x8
 155
 156 #ifdef  __cplusplus
 157 }
 158 #endif
 159
 160 #endif /* _SYS_SYNCH_H */