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 2009 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 #include <sys/ipc_impl.h> 30 #if defined(_KERNEL) || defined(_KMEMUSER) 31 #include <sys/msg.h> 32 #include <sys/t_lock.h> 33 #include <sys/list.h> 34 #endif 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 /* 41 * Argument vectors for the various flavors of msgsys(). 42 */ 43 44 #define MSGGET 0 45 #define MSGCTL 1 46 #define MSGRCV 2 47 #define MSGSND 3 48 #define MSGIDS 4 49 #define MSGSNAP 5 50 51 #if defined(_KERNEL) || defined(_KMEMUSER) 52 53 typedef struct msgq_wakeup { 54 list_node_t msgw_list; 55 long msgw_type; /* Message type request. */ 56 long msgw_snd_wake; /* Type of msg from msgsnd */ 57 size_t msgw_snd_size; /* Designates size of the msg sending */ 58 kthread_t *msgw_thrd; /* Thread waiting */ 59 kcondvar_t msgw_wake_cv; /* waiting on this */ 60 } msgq_wakeup_t; 61 62 63 typedef struct msg_select { 64 msgq_wakeup_t *(*selection)(); 65 struct msg_select *next_selection; 66 } msg_select_t; 67 68 /* 69 * There is one msg structure for each message in the system. 70 */ 71 struct msg { 72 list_node_t msg_node; /* message list node */ 73 long msg_type; /* message type */ 74 size_t msg_size; /* message text size */ 75 void *msg_addr; /* message text address */ 76 long msg_flags; /* message flags */ 77 long msg_copycnt; /* current # of copyouts on message */ 78 }; 79 80 /* 81 * Per message flags 82 */ 83 #define MSG_RCVCOPY 00001 /* msgrcv is copying out this message */ 84 #define MSG_UNLINKED 00002 /* msg has been unlinked from queue */ 85 86 /* 87 * msg_rcv_cv is now an array of kcondvar_t for performance reason. 88 * We use multiple condition variables (kcondvar_t) to avoid needing 89 * to wake all readers when sending a single message. 90 */ 91 92 #define MSG_NEG_INTERVAL 8 93 #define MSG_MAX_QNUM 64 94 #define MSG_MAX_QNUM_CV 65 95 96 typedef struct kmsqid { 97 kipc_perm_t msg_perm; /* operation permission struct */ 98 list_t msg_list; /* list of messages on q */ 99 msglen_t msg_cbytes; /* current # bytes on q */ 100 msgqnum_t msg_qnum; /* # of messages on q */ 101 msgqnum_t msg_qmax; /* max # of messages on q */ 102 msglen_t msg_qbytes; /* max # of bytes on q */ 103 pid_t msg_lspid; /* pid of last msgsnd */ 104 pid_t msg_lrpid; /* pid of last msgrcv */ 105 time_t msg_stime; /* last msgsnd time */ 106 time_t msg_rtime; /* last msgrcv time */ 107 time_t msg_ctime; /* last change time */ 108 uint_t msg_snd_cnt; /* # of waiting senders */ 109 uint_t msg_rcv_cnt; /* # of waiting receivers */ 110 uint64_t msg_lowest_type; /* Smallest type on queue */ 111 /* 112 * linked list of routines used to determine what to wake up next. 113 * msg_fnd_sndr: Routines for waking up readers waiting 114 * for a message from the sender. 115 * msg_fnd_rdr: Routines for waking up readers waiting 116 * for a copyout to finish. 117 */ 118 msg_select_t *msg_fnd_sndr; 119 msg_select_t *msg_fnd_rdr; 120 /* 121 * Various counts and queues for controlling the sleeping 122 * and waking up of processes that are waiting for various 123 * message queue events. 124 * 125 * msg_cpy_block: List of receiving threads that are blocked because 126 * the message of choice is being copied out. 127 * msg_wait_snd: List of receiving threads whose type specifier 128 * is positive or 0 but are blocked because there 129 * are no matches. 130 * msg_wait_snd_ngt: 131 * List of receiving threads whose type specifier is 132 * negative message type but are blocked because 133 * there are no types that qualify. 134 * msg_wait_rcv: List of sending threads that are blocked because 135 * there is no room left on the message queue. 136 */ 137 kcondvar_t msg_snd_cv; 138 list_t msg_cpy_block; 139 list_t msg_wait_snd[MSG_MAX_QNUM_CV]; 140 list_t msg_wait_snd_ngt[MSG_MAX_QNUM_CV]; 141 list_t msg_wait_rcv; 142 size_t msg_snd_smallest; /* Smallest msg on send wait list */ 143 int msg_ngt_cnt; /* # of negative receivers blocked */ 144 char msg_neg_copy; /* Neg type copy underway */ 145 } kmsqid_t; 146 147 #endif /* _KERNEL */ 148 149 #if defined(_SYSCALL32) 150 /* 151 * LP64 view of the ILP32 msgbuf structure 152 */ 153 struct ipcmsgbuf32 { 154 int32_t mtype; /* message type */ 155 char mtext[1]; /* message text */ 156 }; 157 158 /* 159 * LP64 view of the ILP32 msgsnap_head and msgsnap_mhead structures 160 */ 161 struct msgsnap_head32 { 162 size32_t msgsnap_size; /* bytes consumed/required in the buffer */ 163 size32_t msgsnap_nmsg; /* number of messages in the buffer */ 164 }; 165 166 struct msgsnap_mhead32 { 167 size32_t msgsnap_mlen; /* number of bytes in message that follows */ 168 int32_t msgsnap_mtype; /* message type */ 169 }; 170 171 /* 172 * LP64 view of the ILP32 msqid_ds structure 173 */ 174 struct msqid_ds32 { 175 struct ipc_perm32 msg_perm; /* operation permission struct */ 176 caddr32_t msg_first; /* ptr to first message on q */ 177 caddr32_t msg_last; /* ptr to last message on q */ 178 uint32_t msg_cbytes; /* current # bytes on q */ 179 uint32_t msg_qnum; /* # of messages on q */ 180 uint32_t msg_qbytes; /* max # of bytes on q */ 181 pid32_t msg_lspid; /* pid of last msgsnd */ 182 pid32_t msg_lrpid; /* pid of last msgrcv */ 183 time32_t msg_stime; /* last msgsnd time */ 184 int32_t msg_pad1; /* reserved for time_t expansion */ 185 time32_t msg_rtime; /* last msgrcv time */ 186 int32_t msg_pad2; /* time_t expansion */ 187 time32_t msg_ctime; /* last change time */ 188 int32_t msg_pad3; /* time expansion */ 189 int16_t msg_cv; 190 int16_t msg_qnum_cv; 191 int32_t msg_pad4[3]; /* reserve area */ 192 }; 193 #endif /* _SYSCALL32 */ 194 195 #ifdef __cplusplus 196 } 197 #endif 198 199 #endif /* _SYS_MSG_IMPL_H */ 200