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Sepp J Morris 31738079c4 Upload
Digital Research
2020-11-06 18:50:37 +01:00

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;*****************************************************
;*
;* Shared Memory Routines
;*
;*****************************************************
;===========
share_entry: ; share memory
;===========
; input: DX->SPB in u_wrkseg
;
; +-----+-----+-----+-----+-----+-----+
; SPB | OPD | RPD | START |
; +-----+-----+-----+-----+-----+-----+
;
; Obtain new MD
push dx ! call getmd ! pop dx
jcxz se_c
jmp se_err2
se_c: mov bp,bx ; BP = New MD
push ds ! mov ds,u_wrkseg
mov di,dx ! mov bx,spb_opd[di] ; BX = Owner PD
mov si,spb_rpd[di] ; SI = Requestor PD
mov dx,spb_start[di] ; DX = start paragraph
pop ds
cmp bx,0 ! jne se_r
mov bx,rlr
se_r: cmp si,0 ! jne se_s
mov si,rlr
se_s: cmp si,bx ! je se_ge
lea di,(p_mem-ms_link)[bx]
se_go: mov di,ms_link[di]
cmp di,0 ! je se_err
cmp ms_start[di],dx ! jne se_go
; DI = Owner MS to share
; SI = Requestor PD
; DX = Start
; BP = New MD
mov bx,bp
mov ms_start[bx],dx
mov ax,ms_length[di] ! mov ms_length[bx],ax
mov ax,ms_flags[di] ! mov ms_flags[bx],ax
mov ax,ms_mau[di] ! mov ms_mau[bx],ax
mov di,bx ! mov bx,ax
push ds ! mov ds,m_start[bx]
sub bx,bx ! mov cl,.0
se_n: cmp cl,0 ! je se_err1
add bx,satlen ! dec cl
cmp sat_start[bx],dx ! jne se_n
inc sat_nall[bx]
; place new MS on RPD p_mem
pop ds ! lea bx,p_mem[si]
mov dx,ms_mau[di]
se_m: mov si,ms_link[bx]
cmp si,0 ! je se_link
cmp dx,ms_mau[si] ! je se_link
mov bx,si ! jmps se_m
se_link: mov ms_link[di],si
mov ms_link[bx],di
jmps se_ge
se_err1: pop ds ! mov bx,bp ! call freemd
se_err: mov cx,e_no_memory
se_err2: mov bx,0ffffh ! ret
se_ge: sub bx,bx ! mov cx,bx ! ret