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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_MSG_IMPL_H 27 #define _SYS_MSG_IMPL_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/ipc_impl.h> 32 #if defined(_KERNEL) || defined(_KMEMUSER) 33 #include <sys/msg.h> 34 #include <sys/t_lock.h> 35 #include <sys/list.h> 36 #endif 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /* 43 * Argument vectors for the various flavors of msgsys(). 44 */ 45 46 #define MSGGET 0 47 #define MSGCTL 1 48 #define MSGRCV 2 49 #define MSGSND 3 50 #define MSGIDS 4 51 #define MSGSNAP 5 52 53 #if defined(_KERNEL) || defined(_KMEMUSER) 54 55 typedef struct msgq_wakeup { 56 list_node_t msgw_list; 57 long msgw_type; /* Message type request. */ 58 long msgw_snd_wake; /* Type of msg from msgsnd */ 59 kthread_t *msgw_thrd; /* Thread waiting */ 60 kcondvar_t msgw_wake_cv; /* waiting on this */ 61 } msgq_wakeup_t; 62 63 64 typedef struct msg_select { 65 msgq_wakeup_t *(*selection)(); 66 struct msg_select *next_selection; 67 } msg_select_t; 68 69 /* 70 * There is one msg structure for each message in the system. 71 */ 72 struct msg { 73 list_node_t msg_node; /* message list node */ 74 long msg_type; /* message type */ 75 size_t msg_size; /* message text size */ 76 void *msg_addr; /* message text address */ 77 long msg_flags; /* message flags */ 78 long msg_copycnt; /* current # of copyouts on message */ 79 }; 80 81 /* 82 * Per message flags 83 */ 84 #define MSG_RCVCOPY 00001 /* msgrcv is copying out this message */ 85 #define MSG_UNLINKED 00002 /* msg has been unlinked from queue */ 86 87 /* 88 * msg_rcv_cv is now an array of kcondvar_t for performance reason. 89 * We use multiple condition variables (kcondvar_t) to avoid needing 90 * to wake all readers when sending a single message. 91 */ 92 93 #define MSG_NEG_INTERVAL 8 94 #define MSG_MAX_QNUM 64 95 #define MSG_MAX_QNUM_CV 65 96 97 typedef struct kmsqid { 98 kipc_perm_t msg_perm; /* operation permission struct */ 99 list_t msg_list; /* list of messages on q */ 100 msglen_t msg_cbytes; /* current # bytes on q */ 101 msgqnum_t msg_qnum; /* # of messages on q */ 102 msgqnum_t msg_qmax; /* max # of messages on q */ 103 msglen_t msg_qbytes; /* max # of bytes on q */ 104 pid_t msg_lspid; /* pid of last msgsnd */ 105 pid_t msg_lrpid; /* pid of last msgrcv */ 106 time_t msg_stime; /* last msgsnd time */ 107 time_t msg_rtime; /* last msgrcv time */ 108 time_t msg_ctime; /* last change time */ 109 uint_t msg_snd_cnt; /* # of waiting senders */ 110 uint_t msg_rcv_cnt; /* # of waiting receivers */ 111 uint64_t msg_lowest_type; /* Smallest type on queue */ 112 /* 113 * linked list of routines used to determine what to wake up next. 114 * msg_fnd_sndr: Routines for waking up readers waiting 115 * for a message from the sender. 116 * msg_fnd_rdr: Routines for waking up readers waiting 117 * for a copyout to finish. 118 */ 119 msg_select_t *msg_fnd_sndr; 120 msg_select_t *msg_fnd_rdr; 121 /* 122 * Various counts and queues for controlling the sleeping 123 * and waking up of processes that are waiting for various 124 * message queue events. 125 * 126 * msg_cpy_block: List of receiving threads that are blocked because 127 * the message of choice is being copied out. 128 * msg_wait_snd: List of receiving threads whose type specifier 129 * is positive or 0 but are blocked because there 130 * are no matches. 131 * msg_wait_snd_ngt: 132 * List of receiving threads whose type specifier is 133 * negative message type but are blocked because 134 * there are no types that qualify. 135 */ 136 kcondvar_t msg_snd_cv; 137 list_t msg_cpy_block; 138 list_t msg_wait_snd[MSG_MAX_QNUM_CV]; 139 list_t msg_wait_snd_ngt[MSG_MAX_QNUM_CV]; 140 int msg_ngt_cnt; /* # of negative receivers blocked */ 141 char msg_neg_copy; /* Neg type copy underway */ 142 } kmsqid_t; 143 144 #endif /* _KERNEL */ 145 146 #if defined(_SYSCALL32) 147 /* 148 * LP64 view of the ILP32 msgbuf structure 149 */ 150 struct ipcmsgbuf32 { 151 int32_t mtype; /* message type */ 152 char mtext[1]; /* message text */ 153 }; 154 155 /* 156 * LP64 view of the ILP32 msgsnap_head and msgsnap_mhead structures 157 */ 158 struct msgsnap_head32 { 159 size32_t msgsnap_size; /* bytes consumed/required in the buffer */ 160 size32_t msgsnap_nmsg; /* number of messages in the buffer */ 161 }; 162 163 struct msgsnap_mhead32 { 164 size32_t msgsnap_mlen; /* number of bytes in message that follows */ 165 int32_t msgsnap_mtype; /* message type */ 166 }; 167 168 /* 169 * LP64 view of the ILP32 msqid_ds structure 170 */ 171 struct msqid_ds32 { 172 struct ipc_perm32 msg_perm; /* operation permission struct */ 173 caddr32_t msg_first; /* ptr to first message on q */ 174 caddr32_t msg_last; /* ptr to last message on q */ 175 uint32_t msg_cbytes; /* current # bytes on q */ 176 uint32_t msg_qnum; /* # of messages on q */ 177 uint32_t msg_qbytes; /* max # of bytes on q */ 178 pid32_t msg_lspid; /* pid of last msgsnd */ 179 pid32_t msg_lrpid; /* pid of last msgrcv */ 180 time32_t msg_stime; /* last msgsnd time */ 181 int32_t msg_pad1; /* reserved for time_t expansion */ 182 time32_t msg_rtime; /* last msgrcv time */ 183 int32_t msg_pad2; /* time_t expansion */ 184 time32_t msg_ctime; /* last change time */ 185 int32_t msg_pad3; /* time expansion */ 186 int16_t msg_cv; 187 int16_t msg_qnum_cv; 188 int32_t msg_pad4[3]; /* reserve area */ 189 }; 190 #endif /* _SYSCALL32 */ 191 192 #ifdef __cplusplus 193 } 194 #endif 195 196 #endif /* _SYS_MSG_IMPL_H */ 197