/* * 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 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #ifndef _SYS_MSG_IMPL_H #define _SYS_MSG_IMPL_H #include <sys/ipc_impl.h> #if defined(_KERNEL) || defined(_KMEMUSER) #include <sys/msg.h> #include <sys/t_lock.h> #include <sys/list.h> #endif #ifdef __cplusplus extern "C" { #endif /* * Argument vectors for the various flavors of msgsys(). */ #define MSGGET 0 #define MSGCTL 1 #define MSGRCV 2 #define MSGSND 3 #define MSGIDS 4 #define MSGSNAP 5 #if defined(_KERNEL) || defined(_KMEMUSER) typedef struct msgq_wakeup { list_node_t msgw_list; long msgw_type; /* Message type request. */ long msgw_snd_wake; /* Type of msg from msgsnd */ size_t msgw_snd_size; /* Designates size of the msg sending */ kthread_t *msgw_thrd; /* Thread waiting */ kcondvar_t msgw_wake_cv; /* waiting on this */ } msgq_wakeup_t; typedef struct msg_select { msgq_wakeup_t *(*selection)(); struct msg_select *next_selection; } msg_select_t; /* * There is one msg structure for each message in the system. */ struct msg { list_node_t msg_node; /* message list node */ long msg_type; /* message type */ size_t msg_size; /* message text size */ void *msg_addr; /* message text address */ long msg_flags; /* message flags */ long msg_copycnt; /* current # of copyouts on message */ }; /* * Per message flags */ #define MSG_RCVCOPY 00001 /* msgrcv is copying out this message */ #define MSG_UNLINKED 00002 /* msg has been unlinked from queue */ /* * msg_rcv_cv is now an array of kcondvar_t for performance reason. * We use multiple condition variables (kcondvar_t) to avoid needing * to wake all readers when sending a single message. */ #define MSG_NEG_INTERVAL 8 #define MSG_MAX_QNUM 64 #define MSG_MAX_QNUM_CV 65 typedef struct kmsqid { kipc_perm_t msg_perm; /* operation permission struct */ list_t msg_list; /* list of messages on q */ msglen_t msg_cbytes; /* current # bytes on q */ msgqnum_t msg_qnum; /* # of messages on q */ msgqnum_t msg_qmax; /* max # of messages on q */ msglen_t msg_qbytes; /* max # of bytes on q */ pid_t msg_lspid; /* pid of last msgsnd */ pid_t msg_lrpid; /* pid of last msgrcv */ time_t msg_stime; /* last msgsnd time */ time_t msg_rtime; /* last msgrcv time */ time_t msg_ctime; /* last change time */ uint_t msg_snd_cnt; /* # of waiting senders */ uint_t msg_rcv_cnt; /* # of waiting receivers */ uint64_t msg_lowest_type; /* Smallest type on queue */ /* * linked list of routines used to determine what to wake up next. * msg_fnd_sndr: Routines for waking up readers waiting * for a message from the sender. * msg_fnd_rdr: Routines for waking up readers waiting * for a copyout to finish. */ msg_select_t *msg_fnd_sndr; msg_select_t *msg_fnd_rdr; /* * Various counts and queues for controlling the sleeping * and waking up of processes that are waiting for various * message queue events. * * msg_cpy_block: List of receiving threads that are blocked because * the message of choice is being copied out. * msg_wait_snd: List of receiving threads whose type specifier * is positive or 0 but are blocked because there * are no matches. * msg_wait_snd_ngt: * List of receiving threads whose type specifier is * negative message type but are blocked because * there are no types that qualify. * msg_wait_rcv: List of sending threads that are blocked because * there is no room left on the message queue. */ kcondvar_t msg_snd_cv; list_t msg_cpy_block; list_t msg_wait_snd[MSG_MAX_QNUM_CV]; list_t msg_wait_snd_ngt[MSG_MAX_QNUM_CV]; list_t msg_wait_rcv; size_t msg_snd_smallest; /* Smallest msg on send wait list */ int msg_ngt_cnt; /* # of negative receivers blocked */ char msg_neg_copy; /* Neg type copy underway */ } kmsqid_t; #endif /* _KERNEL */ #if defined(_SYSCALL32) /* * LP64 view of the ILP32 msgbuf structure */ struct ipcmsgbuf32 { int32_t mtype; /* message type */ char mtext[1]; /* message text */ }; /* * LP64 view of the ILP32 msgsnap_head and msgsnap_mhead structures */ struct msgsnap_head32 { size32_t msgsnap_size; /* bytes consumed/required in the buffer */ size32_t msgsnap_nmsg; /* number of messages in the buffer */ }; struct msgsnap_mhead32 { size32_t msgsnap_mlen; /* number of bytes in message that follows */ int32_t msgsnap_mtype; /* message type */ }; /* * LP64 view of the ILP32 msqid_ds structure */ struct msqid_ds32 { struct ipc_perm32 msg_perm; /* operation permission struct */ caddr32_t msg_first; /* ptr to first message on q */ caddr32_t msg_last; /* ptr to last message on q */ uint32_t msg_cbytes; /* current # bytes on q */ uint32_t msg_qnum; /* # of messages on q */ uint32_t msg_qbytes; /* max # of bytes on q */ pid32_t msg_lspid; /* pid of last msgsnd */ pid32_t msg_lrpid; /* pid of last msgrcv */ time32_t msg_stime; /* last msgsnd time */ int32_t msg_pad1; /* reserved for time_t expansion */ time32_t msg_rtime; /* last msgrcv time */ int32_t msg_pad2; /* time_t expansion */ time32_t msg_ctime; /* last change time */ int32_t msg_pad3; /* time expansion */ int16_t msg_cv; int16_t msg_qnum_cv; int32_t msg_pad4[3]; /* reserve area */ }; #endif /* _SYSCALL32 */ #ifdef __cplusplus } #endif #endif /* _SYS_MSG_IMPL_H */
