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* m68k: implement basic support for interlocked functions using a TAS based global spinlock on CPUs which don't have the CAS instruction

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This commit is contained in:
Karoly Balogh 2022-02-08 04:42:30 +01:00
parent 077a3f1892
commit 3c5d6e7224
1 changed files with 28 additions and 7 deletions
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35
rtl/m68k/m68k.inc
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@ -467,6 +467,24 @@ end;
{$endif}
{$IFNDEF FPC_SYSTEM_HAS_INTERLOCKEDFUNCS}
{$IFNDEF CPUM68K_HAS_CAS}
var
spinLock: byte;
procedure getSpinLock; assembler; nostackframe;
asm
lea.l spinlock,a0
@loop:
tas (a0)
bne @loop
end;
procedure releaseSpinLock; assembler; nostackframe;
asm
move.b #0,spinlock
end;
{$ENDIF}
function InterLockedDecrement (var Target: longint) : longint;
{$IFDEF CPUM68K_HAS_CAS}
register; assembler;
@ -481,13 +499,13 @@ function InterLockedDecrement (var Target: longint) : longint;
end;
{$ELSE}
begin
{$warning FIX ME}
getSpinLock;
Dec(Target);
Result := Target;
releaseSpinLock;
end;
{$ENDIF}
function InterLockedIncrement (var Target: longint) : longint;
{$IFDEF CPUM68K_HAS_CAS}
register; assembler;
@ -502,9 +520,10 @@ function InterLockedIncrement (var Target: longint) : longint;
end;
{$ELSE}
begin
{$warning FIX ME}
getSpinLock;
Inc(Target);
Result := Target;
releaseSpinLock;
end;
{$ENDIF}
@ -520,13 +539,13 @@ function InterLockedExchange (var Target: longint;Source : longint) : longint;
end;
{$ELSE}
begin
{$warning FIX ME}
getSpinLock;
Result := Target;
Target := Source;
releaseSpinLock;
end;
{$ENDIF}
function InterLockedExchangeAdd (var Target: longint;Source : longint) : longint;
{$IFDEF CPUM68K_HAS_CAS}
register; assembler;
@ -541,9 +560,10 @@ function InterLockedExchangeAdd (var Target: longint;Source : longint) : longint
end;
{$ELSE}
begin
{$warning FIX ME}
getSpinLock;
Result := Target;
Target := Target + Source;
releaseSpinLock;
end;
{$ENDIF}
@ -558,10 +578,11 @@ function InterlockedCompareExchange(var Target: longint; NewValue: longint; Comp
end;
{$ELSE}
begin
{$warning FIX ME}
getSpinLock;
Result := Target;
if Target = Comperand then
Target := NewValue;
releaseSpinLock;
end;
{$ENDIF}
{$ENDIF FPC_SYSTEM_HAS_INTERLOCKEDFUNCS}