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104 lines
2.4 KiB
ObjectPascal
104 lines
2.4 KiB
ObjectPascal
{
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**********************************************************************
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This file is part of the Free Pascal run time library.
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See the file COPYING.FPC, included in this distribution,
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for details about the license.
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**********************************************************************
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System depending code for light weight threads.
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Copyright (C) 2008 Mattias Gaertner mattias@freepascal.org
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}
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unit MTPCPU;
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{$mode objfpc}{$H+}
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{$inline on}
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interface
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{$IF defined(windows)}
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uses Windows;
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{$ELSEIF defined(freebsd) or defined(darwin)}
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uses ctypes, sysctl;
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{$ELSEIF defined(linux)}
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{$linklib c}
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uses ctypes;
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{$ENDIF}
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function GetSystemThreadCount: integer;
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procedure CallLocalProc(AProc, Frame: Pointer; Param1: PtrInt;
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Param2, Param3: Pointer); inline;
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implementation
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{$IFDEF Linux}
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const _SC_NPROCESSORS_ONLN = 83;
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function sysconf(i: cint): clong; cdecl; external name 'sysconf';
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{$ENDIF}
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function GetSystemThreadCount: integer;
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// returns a good default for the number of threads on this system
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{$IF defined(windows)}
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//returns total number of processors available to system including logical hyperthreaded processors
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var
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i: Integer;
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ProcessAffinityMask, SystemAffinityMask: DWORD_PTR;
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Mask: DWORD;
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SystemInfo: SYSTEM_INFO;
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begin
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if GetProcessAffinityMask(GetCurrentProcess, ProcessAffinityMask, SystemAffinityMask)
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then begin
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Result := 0;
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for i := 0 to 31 do begin
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Mask := DWord(1) shl i;
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if (ProcessAffinityMask and Mask)<>0 then
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inc(Result);
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end;
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end else begin
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//can't get the affinity mask so we just report the total number of processors
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GetSystemInfo(SystemInfo);
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Result := SystemInfo.dwNumberOfProcessors;
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end;
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end;
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{$ELSEIF defined(UNTESTEDsolaris)}
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begin
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t = sysconf(_SC_NPROC_ONLN);
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end;
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{$ELSEIF defined(freebsd) or defined(darwin)}
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var
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mib: array[0..1] of cint;
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len: cint;
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t: cint;
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begin
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mib[0] := CTL_HW;
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mib[1] := HW_NCPU;
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len := sizeof(t);
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fpsysctl(pchar(@mib), 2, @t, @len, Nil, 0);
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Result:=t;
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end;
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{$ELSEIF defined(linux)}
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begin
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Result:=sysconf(_SC_NPROCESSORS_ONLN);
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end;
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{$ELSE}
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begin
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Result:=1;
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end;
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{$ENDIF}
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procedure CallLocalProc(AProc, Frame: Pointer; Param1: PtrInt;
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Param2, Param3: Pointer); inline;
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type
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PointerLocal = procedure(_EBP: Pointer; Param1: PtrInt;
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Param2, Param3: Pointer);
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begin
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PointerLocal(AProc)(Frame, Param1, Param2, Param3);
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end;
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end.
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