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Digital-Research-Source-Code/MPM OPERATING SYSTEMS/MPM-86/MPM-86 2.0 SOURCES/02/QD.DEF
Sepp J Morris 31738079c4 Upload
Digital Research
2020-11-06 18:50:37 +01:00

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;*****************************************************
;*
;* Queue Descriptor - This is structure is used
;* to create a queue. One is maintained
;* in the system data area for each queue
;*
;* +----+----+----+----+----+----+----+----+
;* 00 | link |net |org | flags | name...
;* +----+----+----+----+----+----+----+----+
;* 08 ...name | msglen |
;* +----+----+----+----+----+----+----+----+
;* 10 | nmsgs | dq | nq | msgcnt |
;* +----+----+----+----+----+----+----+----+
;* 18 | msgout | buffer |
;* +----+----+----+----+
;*
;* link - used to link QDs is system lists
;* net - which machine in the network
;* org - origin machine in the network
;* flags - Queue Flags
;* name - Name of Queue
;* msglen - # of bytes in one message
;* nmsgs - maximum # of messages in queue
;* dq - Root of PDs waiting to read
;* nq - Root of PDs list waiting to write
;* msgcnt - # of messages currently in queue
;* msgout - next message # to read
;* buf - pointer to queue message buffer
;* (for MX queues, owner of queue)
;*
;*****************************************************
q_link equ word ptr 0
q_net equ byte ptr q_link + word
q_org equ byte ptr q_net + byte
q_flags equ word ptr q_org + byte
q_name equ byte ptr q_flags + word
q_msglen equ word ptr q_name + qnamsiz
q_nmsgs equ word ptr q_msglen + word
q_dq equ word ptr q_nmsgs + word
q_nq equ word ptr q_dq + word
q_msgcnt equ word ptr q_nq + word
q_msgout equ word ptr q_msgcnt + word
q_buf equ word ptr q_msgout + word
qdlen equ q_buf + word
;
; Q_FLAGS values
;
qf_mx equ 001h ; Mutual Exclusion
qf_keep equ 002h ; NO DELETE
qf_hide equ 004h ; Not User writable
qf_rsp equ 008h ; rsp queue
qf_table equ 010h ; from qd table
qf_rpl equ 020h ; rpl queue
qf_dev equ 040h ; device queue
;*****************************************************
;*
;* QPB - Queue Parameter Block
;*
;* +----+----+----+----+----+----+----+----+
;* 00 |flgs|net | qaddr | nmsgs | buffptr |
;* +----+----+----+----+----+----+----+----+
;* 08 | name |
;* +----+----+----+----+----+----+----+----+
;*
;* flgs - unused
;* net - unused (which machine to use)
;* qaddr - Queue ID, address of QD
;* nmsgs - number of messages to read/write
;* buffptr - address to read/write into/from
;* name - name of queue (for open only)
;*
;*****************************************************
qpb_flgs equ byte ptr 0
qpb_net equ byte ptr qpb_flgs + byte
qpb_qaddr equ word ptr qpb_net + byte
qpb_nmsgs equ word ptr qpb_qaddr + word
qpb_buffptr equ word ptr qpb_nmsgs + word
qpb_name equ byte ptr qpb_buffptr + word
qpblen equ qpb_name + qnamsiz