Questions About ICC - comp.os.vms

I am trying the ICC system service stuff (under OpenVMS 7.2-1) out for the first time and noone else at my site has ever used it. 1) I have a multi-threaded server and would like to convert it to use ICC (instead of mailboxes). I see that ICC relies heavily on ASTs and am a little leary because of the constraints / recommendations against mixing kernel threads and ASTs. Comments? 2) I am perplexed (and hopefully not missing something obvious) about how my application is to know the connection handle of an association. I.e., the server opens the assocation and the handle over which it can read from and write to the client is not known until the connection AST is hit. Where is the connection AST supposed to put that handle so that the rest of the server (including individual threads) can access it? Since this is a multi-threaded and very multi-cliented server, global storage is not ideal -- especially since I can't implement locking from an AST. I am trying to avoid the use of an AST to receive data from the client, so I've got to know that handle. 3) My server uses SYS$CREPRC() to create a detached process, which I subsequently send commands to and sometimes collect output from. The image specified is SYS$SYSTEM:LOGINOUT.EXE so that the process will be under the control of a CLI. For the input and output args I used to specify mailbox devices, but now I want to use ICC so that I can launch (and communicate with) processes on other nodes in the cluster. I am baffled about what to use for those parameters - I have tried both the logical name that I specify in the OPEN_ASSOC() call and the assocation name, and also the association name preceeded by <node_name>:: ? 4) Where can I find more doc about ICC? I have found one chapter in the Programming Concepts Manual, one section in the System Manager's Manual, and then the individual system service routines are of course doc'd in the System Services Manual. Programming examples in C would be outstanding right now. Thanks in advance for your input, Sarah Page sarah.page@sas.com

In article <hjg2h0t8n7vcf6l52udt1ghhcf25qrim84@4ax.com>, Sarah Page <sarah.page@sas.com> wrote: > 4) Where can I find more doc about ICC? . . . > Programming examples in C would > be outstanding right now. There is a Perl extension (written in C) that does ICC: http://search.cpan.org/~dsugal/vms-icc-0_02/icc.pm That will by no means answer all of your questions (particularly the thread/AST dilemma) but it may be a place to get started. It might also be useful for prototyping/testing.

In article <hjg2h0t8n7vcf6l52udt1ghhcf25qrim84@4ax.com>, Sarah Page wrote: > 2) I am perplexed (and hopefully not missing something obvious) about > how my application is to know the connection handle of an association. If you're perplexed, then so was I when I implemented ICC as a low-level transport mechanism for our own software, so that makes two of us. I gather the designers of ICC didn't consider the possibility of that one process might want to have more than one association with a need to keep track of them in a generalized rather than hard-coded sort of way. The SYS$ICC routines don't provide any mechanism to pass through a user provided AST parameter to the incomming connection AST routine. So when one must deal with multiple associations in a single process, how is one supposed to know which association the incomming connection AST is associated with? I solved this by creating a pool of 64 separate connection AST routines, then allocating a separate connection AST routine from the pool for each association. Each connection AST routine is then nothing more than a wrapper for the real connection AST routine. The wrapper does nothing more than pass through all the parameters that were passed to it, plus an indication of which association to which it was allocated, to the real connection routine. In other words, I'm effectively using the PC address of the conneciton AST routine to determine which association the incomming connection AST is associated with. Crude, but effective. - Dan

Hi Sarah, My bias/prejudices regarding threads/ASTs are well known and I shall not repeat them here. (Unless your ask specifically :-) But to try and be of some help: - Yes you have to use GLOBAL memory. Isn't that why all this UNIX threading crap has to mutex around simple things like ADD 1 TO CONNECTION_COUNT? VMS, Processor modes, and ASTs do all this for you but if you insist on going againts the grain then that's up to you. Surely some sicko could come up with a C wrapper routine to inline the $ICC calls anaologous to the way the C socket API wrappers the $qio calls? Anyway, my suggestion is to have static (compile-time or run-time allocated) memory database of active and free connections. The address of the individual connection info to be passed to each AST. Clearly not my idea but one that's been around since year dot and one I first noticed in the lovely MACRO DECnet programming examples. What's that you say? They're no longer there on Alpha? Well that's another story. . . I've attached a COBOL example of calling $ICC services. (Not that it solves your problem; just something (single-threaded) I was testing out as the $ICC interface for COBOL was by no means intuitive) Regards Richard Maher RE: .3 I haven't fully explored this, but please explain why you would possibly open more than one association per server? $on warning then exit $set def sys$login $! $create icc_def.mar .title icc_def .library "sys$library:lib.mlb" $iccdef GLOBAL .end $! $macro/lis icc_def $! $create icc_server.cob identification division. program-id. icc_server. author. Richard Maher. data division. working-storage section. 01 ast_receive pic 9(9) comp value external ast_receive. 01 ast_handshake pic 9(9) comp value external ast_handshake. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * 01 assoc_handle pic 9(9) comp. 01 buffer_count pic 9(9) comp value 5. 01 prot_sysprv pic 9(9) comp value 2. * procedure division. kick_off section. 00. perform server_init. display "Hibernating. . .zzzzzz". call "sys$hiber" giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. call "sys$icc_close_assoc" using by value assoc_handle giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. stop run. * server_init section. 00. call "sys$icc_open_assoc" using by reference assoc_handle by descriptor "ICC_TEST_SERVER" by value 0, 0, ast_handshake, ast_handshake, ast_receive, buffer_count, prot_sysprv giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. * end program icc_server. identification division. program-id. ast_handshake. data division. working-storage section. 01 ast_discon pic 9(9) comp value external ast_discon. 01 ss$_reject pic 9(9) comp value external ss$_reject. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * 01 rem_pid pointer. 01 buff_init_size pic 9(9) comp value 1024. 01 event_type pointer. 88 icc$c_ev_connect value external icc$c_ev_connect. 88 icc$c_ev_disconnect value external icc$c_ev_disconnect. 01 cxn_handle pointer. 01 cxn_data_len pointer. 01 cxn_p5. 03 cxn_p5_lw pointer. 66 cxn_reply_buff_len renames cxn_p5_lw. 66 cxn_discon_status renames cxn_p5_lw. 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 ios_icc. 05 icc_status pic 9(4) comp. 05 pic xx. 05 recv_len pic 9(9) comp. 05 req_handle pic 9(9) comp. 05 reply_len pic 9(9) comp. * linkage section. 01 by_val_event_type pic 9(9) comp. 01 by_val_cxn_handle pic 9(9) comp. 01 by_val_cxn_data_len pic 9(9) comp. 01 cxn_data_buff pic x(1000). 01 by_val_cxn_p5 pic 9(9) comp. 01 discon_user_context pic x(32). 01 rem_username pic x(12). * procedure division using by_val_event_type, by_val_cxn_handle, by_val_cxn_data_len, cxn_data_buff, by_val_cxn_p5, discon_user_context, rem_username. kick_off section. 00. set cxn_handle to reference by_val_cxn_handle. set cxn_data_len to reference by_val_cxn_data_len. set cxn_p5_lw to reference by_val_cxn_p5. set event_type to reference by_val_event_type. evaluate true when icc$c_ev_connect perform accept_reject_cxn when icc$c_ev_disconnect perform remove_cxn when other call "lib$stop" using by value ss$_abort end-evaluate. * fini. exit program. * accept_reject_cxn section. 00. set rem_pid to reference discon_user_context. display "pid = ", rem_pid with conversion. display "username = ", rem_username. display "connect data = ", cxn_data_buff(1:cxn_data_len). display "cxn_data_len is ", cxn_data_len with conversion. display "reply_buff_len = ", cxn_reply_buff_len with conversion. if cxn_data_buff(1:cxn_data_len) = "*Hello!*" call "sys$icc_accept" using by value cxn_handle by reference "*accepted*" by value 10 by reference user_context by value 0 giving sys_status else call "sys$icc_reject" using by value cxn_handle by reference "*rejected*" by value 10, ss$_reject giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. call "lib$get_vm" using buff_init_size, input_buff giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. move buff_init_size to input_buff_size. * fini. * remove_cxn section. 00. move discon_user_context to user_context. display "Exit Status was ", cxn_discon_status with conversion. call "sys$icc_disconnect" using by value cxn_handle by reference iosb by value ast_discon by reference user_context by value 0,0 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. * end program ast_handshake. identification division. program-id. ast_receive. data division. working-storage section. 01 ast_read_comp pic 9(9) comp value external ast_read_comp. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * 01 cxn_handle pointer. 01 message_size pointer. * linkage section. 01 by_val_msg_size pic 9(9) comp. 01 by_val_cxn_handle pic 9(9) comp. 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 ios_icc. 05 icc_status pic 9(4) comp. 05 pic xx. 05 recv_len pic 9(9) comp. 05 req_handle pic 9(9) comp. 05 reply_len pic 9(9) comp. * procedure division using by_val_msg_size, by_val_cxn_handle, user_context. 00. set message_size to reference by_val_msg_size. set cxn_handle to reference by_val_cxn_handle. display "MSG Size = ", message_size with conversion. if message_size > input_buff_size call "lib$free_vm" using input_buff_size, input_buff giving sys_status if sys_status not = ss$_normal call "lib$stop" using by value sys_status end-if call "lib$get_vm" using message_size, input_buff giving sys_status if sys_status not = ss$_normal call "lib$stop" using by value sys_status end-if move message_size to input_buff_size. call "sys$icc_receive" using by value cxn_handle by reference ios_icc by value ast_read_comp by reference user_context by value input_buff, input_buff_size giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. exit program. * end program ast_receive. identification division. program-id. ast_read_comp. data division. working-storage section. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 ios_icc. 05 icc_status pic 9(4) comp. 05 pic xx. 05 recv_len pic 9(9) comp. 05 req_handle pic 9(9) comp. 05 reply_len pic 9(9) comp. * procedure division using user_context. 00. display "in read ast". if icc_status not = ss$_normal call "lib$stop" using by value icc_status. if req_handle not = zeros display "Can't handle transceives" call "lib$stop" using by value ss$_abort. call "output_msg" using by value input_buff by reference recv_len. * fini. exit program. * end program ast_read_comp. identification division. program-id. ast_discon. data division. working-storage section. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_linkdiscon pic 9(9) comp value external ss$_linkdiscon. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 ios_icc. 05 icc_status pic 9(4) comp. 05 pic xx. 05 recv_len pic 9(9) comp. 05 req_handle pic 9(9) comp. 05 reply_len pic 9(9) comp. * procedure division using user_context. 00. display "in discon ast". if cond_val not = ss$_normal and ss$_linkdiscon call "lib$stop" using by value cond_val. * fini. exit program. * end program ast_discon. identification division. program-id. output_msg. data division. working-storage section. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_linkdiscon pic 9(9) comp value external ss$_linkdiscon. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 out_buff pic x(65535). 01 out_len pic 9(9) comp. * procedure division using out_buff, out_len. 00. display "message = ", out_buff(1:out_len). * fini. exit program. * end program output_msg. $! $create icc_server.inp $deck $run icc_server $eod $! $cobol/lis icc_server $link icc_server,icc_def $run/detach sys$system:loginout.exe/out=icc_server.out/inp=icc_server.inp/process_name=i cc_server $! $create icc_client.cob identification division. program-id. icc_client. author. Richard Maher. data division. working-storage section. 01 ast_receive pic 9(9) comp value external ast_receive. 01 ast_disconnect pic 9(9) comp value external ast_disconnect. 01 ast_cxn_comp pic 9(9) comp value external ast_cxn_comp. 01 ss$_wasclr pic 9(9) comp value external ss$_wasclr. 01 ss$_wasset pic 9(9) comp value external ss$_wasset. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * 01 syi_item_list. 03 item_node_name. 05 pic 9(4) comp value 6. 05 pic 9(4) comp value external syi$_nodename. 05 pointer value reference node_name. 05 pointer value reference node_name_length. 03 pic 9(9) comp. * 01 syi_iosb. 03 syi_status pic 9(9) comp. 03 pic x(4). 01 node_name pic x(6). 01 node_name_length pic 9(4) comp. * 01 assoc_handle pic 9(9) comp. 01 buffer_count pic 9(9) comp value 5. 01 prot_sysprv pic 9(9) comp value 2. 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 cxn_handle pic 9(9) comp. 03 return_buff pic x(512). 03 return_buff_len pic 9(4) comp. * procedure division. kick_off section. 00. perform client_init. call "sys$setast" using by value 0 giving sys_status. if sys_status not = ss$_wasset call "lib$stop" using by value sys_status. call "sys$icc_connect" using by reference iosb by value ast_cxn_comp by reference user_context by value assoc_handle by reference cxn_handle by descriptor "ICC_TEST_SERVER", node_name(1:node_name_length) by reference user_context, "*Hello!*" by value 8 by reference return_buff by value 512 by reference return_buff_len by value 0 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. display "Hibernating. . .zzzzzzz". call "sys$setast" using by value 1 giving sys_status. if sys_status not = ss$_wasclr call "lib$stop" using by value sys_status. call "sys$hiber". call "sys$setast" using by value 0 giving sys_status. if sys_status not = ss$_wasset call "lib$stop" using by value sys_status. display "Trying again.". call "sys$icc_connect" using by reference iosb by value ast_cxn_comp by reference user_context by value assoc_handle by reference cxn_handle by descriptor "ICC_TEST_SERVER", node_name(1:node_name_length) by reference user_context, "1234567" by value 7 by reference return_buff by value 512 by reference return_buff_len by value 0 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. display "Hibernating. . .zzzzzzz". call "sys$setast" using by value 1 giving sys_status. if sys_status not = ss$_wasclr call "lib$stop" using by value sys_status. call "sys$hiber". display "Exiting.". * fini. call "sys$icc_close_assoc" using by value assoc_handle giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. stop run. * client_init section. 00. call "sys$getsyiw" using by value 0, 0, 0, by reference syi_item_list, syi_iosb by value 0, 0 giving sys_status. if sys_status = ss$_normal move syi_status to sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. call "sys$icc_open_assoc" using by reference assoc_handle by descriptor "ICC_TEST_CLIENT" by value 0, 0, 0, ast_disconnect, ast_receive, buffer_count, prot_sysprv giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. * end program icc_client. identification division. program-id. ast_disconnect. data division. working-storage section. 01 ast_discon pic 9(9) comp value external ast_discon. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * 01 rem_pid pointer. 01 buff_init_size pic 9(9) comp value 1024. * linkage section. 01 event_type pic 9(9) comp. 88 icc$c_ev_connect value external icc$c_ev_connect. 88 icc$c_ev_disconnect value external icc$c_ev_disconnect. 01 cxn_handle pic 9(9) comp. 01 cxn_data_len pic 9(9) comp. 01 cxn_data_buff pic x(1000). 01 cxn_p5. 03 cxn_p5_lw pic 9(9) comp. 66 cxn_reply_buff_len renames cxn_p5_lw. 66 cxn_discon_status renames cxn_p5_lw. 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 a_cxn_handle pic 9(9) comp. 03 return_buff pic x(512). 03 return_buff_len pic 9(4) comp. 01 rem_username pic x(12). * procedure division using event_type, cxn_handle, cxn_data_len, cxn_data_buff, cxn_p5, user_context, rem_username. kick_off section. 00. if icc$c_ev_disconnect perform remove_cxn else call "lib$stop" using by value ss$_abort. * fini. exit program. * remove_cxn section. 00. display "exit Status was ", cxn_discon_status with conversion. call "sys$icc_disconnect" using by value cxn_handle by reference iosb by value ast_discon by reference user_context by value 0,0 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. * end program ast_disconnect. identification division. program-id. ast_receive. data division. working-storage section. 01 ast_read_comp pic 9(9) comp value external ast_read_comp. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * 01 ast_param. 03 ios_icc. 05 icc_status pic 9(4) comp. 05 pic xx. 05 recv_len pic 9(9) comp. 05 req_handle pic 9(9) comp. 05 reply_len pic 9(9) comp. * linkage section. 01 message_size pic 9(9) comp. 01 cxn_handle pic 9(9) comp. 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 a_cxn_handle pic 9(9) comp. 03 return_buff pic x(512). 03 return_buff_len pic 9(4) comp. * procedure division using message_size, cxn_handle, user_context. 00. display "MSG Size = ", message_size with conversion. if message_size > input_buff_size call "lib$free_vm" using input_buff_size, input_buff giving sys_status if sys_status not = ss$_normal call "lib$stop" using by value sys_status end-if call "lib$get_vm" using message_size, input_buff giving sys_status if sys_status not = ss$_normal call "lib$stop" using by value sys_status end-if move message_size to input_buff_size. call "sys$icc_receive" using by value cxn_handle by reference ios_icc by value ast_read_comp by reference ast_param by value input_buff, input_buff_size giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. exit program. * end program ast_receive. identification division. program-id. ast_read_comp. data division. working-storage section. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 ast_param. 03 ios_icc. 05 icc_status pic 9(4) comp. 05 pic xx. 05 recv_len pic 9(9) comp. 05 req_handle pic 9(9) comp. 05 reply_len pic 9(9) comp. * procedure division using ast_param. 00. display "in read ast". if icc_status not = ss$_normal call "lib$stop" using by value sys_status. if req_handle not = zeros display "Can't handle transceives" call "lib$stop" using by value ss$_abort. * fini. exit program. * end program ast_read_comp. identification division. program-id. ast_discon. data division. working-storage section. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 a_cxn_handle pic 9(9) comp. 03 return_buff pic x(512). 03 return_buff_len pic 9(4) comp. * procedure division using user_context. 00. display "in discon ast", cond_val with conversion. if cond_val not = ss$_normal call "lib$stop" using by value cond_val. call "sys$wake" using by value 0, 0 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. exit program. * end program ast_discon. identification division. program-id. ast_cxn_comp. data division. working-storage section. 01 ast_xmit pic 9(9) comp value external ast_xmit. 01 ss$_reject pic 9(9) comp value external ss$_reject. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 a_cxn_handle pic 9(9) comp. 03 return_buff pic x(512). 03 return_buff_len pic 9(4) comp. * procedure division using user_context. 00. display "in cxn_comp ast". if cond_val = ss$_reject display "CXN rejected!" call "sys$wake" using by value 0, 0 giving sys_status if sys_status not = ss$_normal call "lib$stop" using by value sys_status end-if go to fini. if cond_val not = ss$_normal call "lib$stop" using by value cond_val. if return_buff_len not = zeros display "Return buff = ", return_buff (1:return_buff_len). call "sys$icc_transmit" using by value a_cxn_handle by reference iosb by value ast_xmit by reference user_context, "This is the message. . ." by value 24 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. exit program. * end program ast_cxn_comp. identification division. program-id. ast_xmit. data division. working-storage section. 01 ast_discon pic 9(9) comp value external ast_discon. 01 ss$_linkdiscon pic 9(9) comp value external ss$_linkdiscon. 01 ss$_abort pic 9(9) comp value external ss$_abort. 01 ss$_normal pic 9(9) comp value external ss$_normal. 01 sys_status pic 9(9) comp. * linkage section. * 01 user_context. 03 iosb. 05 cond_val pic 9(4) comp. 05 pic x(6). 03 input_buff pic 9(9) comp. 03 input_buff_size pic 9(9) comp. 03 a_cxn_handle pic 9(9) comp. 03 return_buff pic x(512). 03 return_buff_len pic 9(4) comp. * procedure division using user_context. 00. display "in xmit ast", cond_val with conversion. if cond_val = ss$_linkdiscon go to fini. if cond_val not = ss$_normal call "lib$stop" using by value cond_val. call "sys$icc_disconnect" using by value a_cxn_handle by reference iosb by value ast_discon by reference user_context by value 0,0 giving sys_status. if sys_status not = ss$_normal call "lib$stop" using by value sys_status. * fini. exit program. * end program ast_xmit. $! $cobol/lis icc_client $link icc_client,icc_def $run icc_client $stop icc_server $exit Sarah Page <sarah.page@sas.com> wrote in message news:hjg2h0t8n7vcf6l52udt1ghhcf25qrim84@4ax.com... > I am trying the ICC system service stuff (under OpenVMS 7.2-1) out for > the first time and noone else at my site has ever used it. > > 1) I have a multi-threaded server and would like to convert it to use > ICC (instead of mailboxes). I see that ICC relies heavily on ASTs and > am a little leary because of the constraints / recommendations against > mixing kernel threads and ASTs. Comments? > > 2) I am perplexed (and hopefully not missing something obvious) about > how my application is to know the connection handle of an association. > I.e., the server opens the assocation and the handle over which it can > read from and write to the client is not known until the connection > AST is hit. Where is the connection AST supposed to put that handle > so that the rest of the server (including individual threads) can > access it? Since this is a multi-threaded and very multi-cliented > server, global storage is not ideal -- especially since I can't > implement locking from an AST. I am trying to avoid the use of an AST > to receive data from the client, so I've got to know that handle. > > 3) My server uses SYS$CREPRC() to create a detached process, which I > subsequently send commands to and sometimes collect output from. The > image specified is SYS$SYSTEM:LOGINOUT.EXE so that the process will be > under the control of a CLI. For the input and output args I used to > specify mailbox devices, but now I want to use ICC so that I can > launch (and communicate with) processes on other nodes in the cluster. > I am baffled about what to use for those parameters - I have tried > both the logical name that I specify in the OPEN_ASSOC() call and the > assocation name, and also the association name preceeded by > <node_name>:: ? > > 4) Where can I find more doc about ICC? I have found one chapter in > the Programming Concepts Manual, one section in the System Manager's > Manual, and then the individual system service routines are of course > doc'd in the System Services Manual. Programming examples in C would > be outstanding right now. > > Thanks in advance for your input, > > Sarah Page > sarah.page@sas.com

Sarah Page wrote: > I am trying the ICC system service stuff (under OpenVMS 7.2-1) out for > the first time and noone else at my site has ever used it. > [snip] > > 4) Where can I find more doc about ICC? I have found one chapter in > the Programming Concepts Manual, one section in the System Manager's > Manual, and then the individual system service routines are of course > doc'd in the System Services Manual. Programming examples in C would > be outstanding right now. > Example code in C. http://www.eight-cubed.com/examples/framework.php?file=sys_icc.c Regards, Jim. -- jim AT eight DASH cubed DOT com

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