e87bbef75c
The rsrv server is updated in this commit to deliver variable sized waveforms in response to a zero length request, implementing an extension to the v4 EPICS protocol tied to minor version 13. The core of the changes are in read_reply, rsrv/camessage.c, which first reserves packet space for the largest possible response, but then resizes the packet according to how much data is actually returned from the database.
233 lines
7.6 KiB
C
233 lines
7.6 KiB
C
/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* Author: Jeffrey O. Hill
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*
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*/
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#ifndef INCLserverh
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#define INCLserverh
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#ifdef epicsExportSharedSymbols
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# define rsrvRestore_epicsExportSharedSymbols
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# undef epicsExportSharedSymbols
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#endif /* ifdef epicsExportSharedSymbols */
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#include "epicsThread.h"
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#include "epicsMutex.h"
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#include "epicsEvent.h"
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#include "bucketLib.h"
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#include "asLib.h"
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#include "dbAddr.h"
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#include "dbNotify.h"
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#define CA_MINOR_PROTOCOL_REVISION 13
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#include "caProto.h"
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#include "ellLib.h"
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#include "epicsTime.h"
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#include "epicsAssert.h"
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#ifdef rsrvRestore_epicsExportSharedSymbols
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#define epicsExportSharedSymbols
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#endif
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/* a modified ca header with capacity for large arrays */
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typedef struct caHdrLargeArray {
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ca_uint32_t m_postsize; /* size of message extension */
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ca_uint32_t m_count; /* operation data count */
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ca_uint32_t m_cid; /* channel identifier */
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ca_uint32_t m_available; /* protocol stub dependent */
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ca_uint16_t m_dataType; /* operation data type */
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ca_uint16_t m_cmmd; /* operation to be performed */
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} caHdrLargeArray;
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/*
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* !! buf must be the first item in this structure !!
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* This guarantees that buf will have 8 byte natural
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* alignment
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*
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* The terminating unsigned pad0 field is there to force the
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* length of the message_buffer to be a multiple of 8 bytes.
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* This is due to the sequential placing of two message_buffer
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* structures (trans, rec) within the client structure.
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* Eight-byte alignment is required by the Sparc 5 and other RISC
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* processors.
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*/
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enum messageBufferType { mbtUDP, mbtSmallTCP, mbtLargeTCP };
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struct message_buffer {
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char *buf;
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unsigned stk;
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unsigned maxstk;
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unsigned cnt;
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enum messageBufferType type;
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};
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extern epicsThreadPrivateId rsrvCurrentClient;
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typedef struct client {
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ELLNODE node;
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struct message_buffer send;
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struct message_buffer recv;
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epicsMutexId lock;
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epicsMutexId putNotifyLock;
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epicsMutexId chanListLock;
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epicsMutexId eventqLock;
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ELLLIST chanList;
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ELLLIST chanPendingUpdateARList;
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ELLLIST putNotifyQue;
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struct sockaddr_in addr;
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epicsTimeStamp time_at_last_send;
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epicsTimeStamp time_at_last_recv;
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void *evuser;
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char *pUserName;
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char *pHostName;
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epicsEventId blockSem; /* used whenever the client blocks */
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SOCKET sock;
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int proto;
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epicsThreadId tid;
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unsigned minor_version_number;
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ca_uint32_t seqNoOfReq; /* for udp */
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unsigned recvBytesToDrain;
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unsigned priority;
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char disconnect; /* disconnect detected */
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} client;
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enum rsrvChanState {
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rsrvCS_invalid,
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rsrvCS_pendConnectResp,
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rsrvCS_inService,
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rsrvCS_pendConnectRespUpdatePendAR,
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rsrvCS_inServiceUpdatePendAR
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};
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/*
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* per channel structure
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* (stored in chanList or chanPendingUpdateARList off of a client block)
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*/
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struct channel_in_use {
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ELLNODE node;
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ELLLIST eventq;
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struct client *client;
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struct rsrv_put_notify *pPutNotify; /* potential active put notify */
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const unsigned cid; /* client id */
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const unsigned sid; /* server id */
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epicsTimeStamp time_at_creation; /* for UDP timeout */
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struct dbAddr addr;
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ASCLIENTPVT asClientPVT;
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enum rsrvChanState state;
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};
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/*
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* Event block extension for channel access
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* some things duplicated for speed
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*/
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struct event_ext {
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ELLNODE node;
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caHdrLargeArray msg;
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struct channel_in_use *pciu;
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struct event_block *pdbev; /* ptr to db event block */
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unsigned size; /* for speed */
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unsigned mask;
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char modified; /* mod & ev flw ctrl enbl */
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};
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enum ctl {ctlRun, ctlPause, ctlExit};
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/* NOTE: external used so they remember the state across loads */
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#ifdef GLBLSOURCE
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# define GLBLTYPE
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# define GLBLTYPE_INIT(A)
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#else
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# define GLBLTYPE extern
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# define GLBLTYPE_INIT(A)
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#endif
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/*
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* for debug-level dependent messages:
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*/
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#ifdef DEBUG
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# define DLOG(LEVEL,ARGSINPAREN) \
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if (CASDEBUG > LEVEL) errlogPrintf ARGSINPAREN
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#else
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# define DLOG(LEVEL,ARGSINPAREN)
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#endif
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GLBLTYPE int CASDEBUG;
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GLBLTYPE SOCKET IOC_sock;
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GLBLTYPE SOCKET IOC_cast_sock;
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GLBLTYPE unsigned short ca_server_port;
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GLBLTYPE ELLLIST clientQ; /* locked by clientQlock */
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GLBLTYPE ELLLIST beaconAddrList;
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GLBLTYPE epicsMutexId clientQlock;
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GLBLTYPE struct client *prsrv_cast_client;
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GLBLTYPE BUCKET *pCaBucket;
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GLBLTYPE void *rsrvClientFreeList;
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GLBLTYPE void *rsrvChanFreeList;
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GLBLTYPE void *rsrvEventFreeList;
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GLBLTYPE void *rsrvSmallBufFreeListTCP;
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GLBLTYPE void *rsrvLargeBufFreeListTCP;
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GLBLTYPE unsigned rsrvSizeofLargeBufTCP;
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GLBLTYPE void *rsrvPutNotifyFreeList;
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GLBLTYPE unsigned rsrvChannelCount;
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GLBLTYPE epicsEventId casudp_startStopEvent;
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GLBLTYPE epicsEventId beacon_startStopEvent;
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GLBLTYPE epicsEventId castcp_startStopEvent;
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GLBLTYPE volatile enum ctl casudp_ctl;
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GLBLTYPE volatile enum ctl beacon_ctl;
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GLBLTYPE volatile enum ctl castcp_ctl;
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#define CAS_HASH_TABLE_SIZE 4096
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#define SEND_LOCK(CLIENT) epicsMutexMustLock((CLIENT)->lock)
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#define SEND_UNLOCK(CLIENT) epicsMutexUnlock((CLIENT)->lock)
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#define LOCK_CLIENTQ epicsMutexMustLock (clientQlock);
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#define UNLOCK_CLIENTQ epicsMutexUnlock (clientQlock);
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void camsgtask (void *client);
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void cas_send_bs_msg ( struct client *pclient, int lock_needed );
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void cas_send_dg_msg ( struct client *pclient );
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void rsrv_online_notify_task (void *);
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void cast_server (void *);
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struct client *create_client ( SOCKET sock, int proto );
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void destroy_client ( struct client * );
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struct client *create_tcp_client ( SOCKET sock );
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void destroy_tcp_client ( struct client * );
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void casAttachThreadToClient ( struct client * );
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int camessage ( struct client *client );
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void rsrv_extra_labor ( void * pArg );
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int rsrvCheckPut ( const struct channel_in_use *pciu );
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int rsrv_version_reply ( struct client *client );
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void rsrvFreePutNotify ( struct client *pClient,
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struct rsrv_put_notify *pNotify );
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void initializePutNotifyFreeList (void);
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unsigned rsrvSizeOfPutNotify ( struct rsrv_put_notify *pNotify );
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/*
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* inclming protocol maintetnance
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*/
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void casExpandRecvBuffer ( struct client *pClient, ca_uint32_t size );
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/*
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* outgoing protocol maintenance
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*/
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void casExpandSendBuffer ( struct client *pClient, ca_uint32_t size );
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int cas_copy_in_header (
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struct client *pClient, ca_uint16_t response, ca_uint32_t payloadSize,
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ca_uint16_t dataType, ca_uint32_t nElem, ca_uint32_t cid,
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ca_uint32_t responseSpecific, void **pPayload );
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void cas_set_header_cid ( struct client *pClient, ca_uint32_t );
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void cas_set_header_count (struct client *pClient, ca_uint32_t count);
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void cas_commit_msg ( struct client *pClient, ca_uint32_t size );
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#endif /*INCLserverh*/
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