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\ Hypervisor Software File: mutex.fth
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id: @(#)mutex.fth 1.5 01/05/11
copyright: Copyright 1999-2001 Sun Microsystems, Inc. All Rights Reserved
: mutex-create ( -- ) \ name
: sema-create ( -- ) \ name
also assembler definitions
: mutex-exit ( scr sc1 sc2 -- ) \ which?
over ' >body origin- aligned swap set \ offset of mutex
over base over add \ Address of mutex
: mutex-set ( value-reg scr -- ) \ which?
' >body origin- aligned over set
\ if scr = -1 then you got the lock (ie the lock was -1), otherwise
\ it is the current owner.
: mutex-try-enter ( scr sc1 sc2 -- scr ) \ which?
over ' >body origin- aligned swap set \ offset of mutex
over base over add \ Address of mutex
\ h# 80 r@ rot >r r@ casa
: mutex-enter ( scr sc1 sc2 sc3 -- ) \ which?
over ' >body origin- aligned swap set \ offset of mutex
over base over add \ Address of mutex
nop nop nop \ allow a little slack time.
2r@ drop over move \ restore mid
\ h# 80 r> rot dup >r casa
%g0 %g0 %g0 subcc \ aquired lock
\ src contains the value to init the semaphore with
: init-sema ( scr sc1 -- ) \ name
' >body origin- aligned sema-sc1 set \ sc1 = offset of semaphore
sema-scr sema-sc1 base st \ store
sema-scr base sema-scr add \ VA of semaphore
sema-scr h# 04 sema-sc1 sema-sc2 casa
sema-sc1 sema-sc2 %g0 subcc
\ decremented value is returned in scr.
: decr-sema ( scr sc1 sc2 -- ) \ name
' >body origin- aligned sema-scr set \ scr = offset of semaphore
: wait-sema ( scr sc1 sc2 -- ) \ name
' >body origin- aligned sema-scr set \ scr = offset of semaphore