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482 lines
13 KiB
PHP
482 lines
13 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2002-5 by Tomas Hajny,
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member of the Free Pascal development team.
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OS/2 threading support implementation
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{*****************************************************************************
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Local Api imports
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*****************************************************************************}
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const
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pag_Read = 1;
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pag_Write = 2;
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pag_Execute = 4;
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pag_Guard = 8;
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pag_Commit = $10;
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obj_Tile = $40;
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sem_Indefinite_Wait = -1;
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dtSuspended = 1;
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dtStack_Commited = 2;
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{ import the necessary stuff from the OS }
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function DosAllocThreadLocalMemory (Count: cardinal; var P: pointer): cardinal;
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cdecl; external 'DOSCALLS' index 454;
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function DosFreeThreadLocalMemory (P: pointer): cardinal; cdecl;
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external 'DOSCALLS' index 455;
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function DosCreateThread (var TID: cardinal; Address: pointer;
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(* TThreadFunc *)
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aParam: pointer; Flags: cardinal; StackSize: cardinal): cardinal; cdecl;
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external 'DOSCALLS' index 311;
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function DosCreateMutExSem (Name: PChar; var Handle: longint; Attr: cardinal;
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State: boolean): cardinal; cdecl; external 'DOSCALLS' index 331;
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function DosCloseMutExSem (Handle: longint): cardinal; cdecl;
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external 'DOSCALLS' index 333;
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function DosQueryMutExSem (Handle: longint; var PID, TID, Count: cardinal):
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cardinal; cdecl; external 'DOSCALLS' index 336;
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function DosRequestMutExSem (Handle:longint; Timeout: cardinal): cardinal; cdecl;
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external 'DOSCALLS' index 334;
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function DosReleaseMutExSem (Handle: longint): cardinal; cdecl;
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external 'DOSCALLS' index 335;
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{
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function DosEnterCritSec:cardinal; cdecl; external 'DOSCALLS' index 232;
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function DosExitCritSec:cardinal; cdecl; external 'DOSCALLS' index 233;
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}
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procedure DosSleep (MSec: cardinal); cdecl; external 'DOSCALLS' index 229;
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{*****************************************************************************
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Threadvar support
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*****************************************************************************}
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const
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ThreadVarBlockSize: dword = 0;
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var
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(* Pointer to an allocated dword space within the local thread *)
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(* memory area. Pointer to the real memory block allocated for *)
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(* thread vars in this block is then stored in this dword. *)
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DataIndex: PPointer;
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procedure SysInitThreadvar (var Offset: dword; Size: dword);
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begin
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Offset := ThreadVarBlockSize;
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Inc (ThreadVarBlockSize, Size);
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end;
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function SysRelocateThreadVar (Offset: dword): pointer;
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begin
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SysRelocateThreadVar := DataIndex^ + Offset;
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end;
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procedure SysAllocateThreadVars;
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begin
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{ we've to allocate the memory from the OS }
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{ because the FPC heap management uses }
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{ exceptions which use threadvars but }
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{ these aren't allocated yet ... }
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{ allocate room on the heap for the thread vars }
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if DosAllocMem (DataIndex^, ThreadVarBlockSize, pag_Read or pag_Write
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or pag_Commit) <> 0 then HandleError (8);
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end;
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procedure SysReleaseThreadVars;
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begin
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{ release thread vars }
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DosFreeMem (DataIndex^);
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DosFreeThreadLocalMemory (DataIndex);
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end;
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(* procedure InitThreadVars;
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begin
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{ allocate one ThreadVar entry from the OS, we use this entry }
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{ for a pointer to our threadvars }
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if DosAllocThreadLocalMemory (1, DataIndex) <> 0 then HandleError (8);
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{ initialize threadvars }
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init_all_unit_threadvars;
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{ allocate mem for main thread threadvars }
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SysAllocateThreadVars;
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{ copy main thread threadvars }
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copy_all_unit_threadvars;
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{ install threadvar handler }
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fpc_threadvar_relocate_proc := @SysRelocateThreadvar;
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end;
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*)
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{*****************************************************************************
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Thread starting
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*****************************************************************************}
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type
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pthreadinfo = ^tthreadinfo;
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tthreadinfo = record
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f : tthreadfunc;
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p : pointer;
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stklen : cardinal;
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end;
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(* procedure InitThread(stklen:cardinal);
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begin
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SysResetFPU;
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SysInitFPU;
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{ ExceptAddrStack and ExceptObjectStack are threadvars }
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{ so every thread has its on exception handling capabilities }
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SysInitExceptions;
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{ Open all stdio fds again }
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SysInitStdio;
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InOutRes:=0;
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// ErrNo:=0;
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{ Stack checking }
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StackLength:=stklen;
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StackBottom:=Sptr - StackLength;
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end;
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*)
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function ThreadMain(param : pointer) : pointer;cdecl;
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var
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ti : tthreadinfo;
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begin
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{ Allocate local thread vars, this must be the first thing,
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because the exception management and io depends on threadvars }
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SysAllocateThreadVars;
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{ Copy parameter to local data }
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{$ifdef DEBUG_MT}
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writeln('New thread started, initialising ...');
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{$endif DEBUG_MT}
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ti:=pthreadinfo(param)^;
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dispose(pthreadinfo(param));
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{ Initialize thread }
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InitThread(ti.stklen);
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{ Start thread function }
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{$ifdef DEBUG_MT}
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writeln('Jumping to thread function');
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{$endif DEBUG_MT}
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ThreadMain:=pointer(ti.f(ti.p));
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end;
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function SysBeginThread(sa : Pointer;stacksize : SizeUInt;
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ThreadFunction : tthreadfunc;p : pointer;
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creationFlags : dword; var ThreadId : TThreadID) : DWord;
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var
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TI: PThreadInfo;
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begin
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{$ifdef DEBUG_MT}
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writeln('Creating new thread');
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{$endif DEBUG_MT}
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{ Initialize multithreading if not done }
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if not IsMultiThread then
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begin
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if DosAllocThreadLocalMemory (1, DataIndex) <> 0
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then RunError (8);
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InitThreadVars(@SysRelocateThreadVar);
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IsMultiThread:=true;
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end;
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{ the only way to pass data to the newly created thread
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in a MT safe way, is to use the heap }
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New (TI);
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TI^.F := ThreadFunction;
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TI^.P := P;
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TI^.StkLen := StackSize;
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{ call pthread_create }
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{$ifdef DEBUG_MT}
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writeln('Starting new thread');
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{$endif DEBUG_MT}
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if DosCreateThread (DWord (ThreadID), @ThreadMain, SA,
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CreationFlags, StackSize) = 0 then
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SysBeginThread := ThreadID else SysBeginThread := 0;
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end;
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procedure SysEndThread (ExitCode : DWord);
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begin
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DoneThread;
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DosExit (1, ExitCode);
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end;
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procedure SysThreadSwitch;
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begin
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DosSleep (0);
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end;
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function SysSuspendThread (ThreadHandle: dword): dword;
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begin
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{$WARNING TODO!}
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{ SysSuspendThread := WinSuspendThread(threadHandle);
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}
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end;
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function SysResumeThread (ThreadHandle: dword): dword;
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begin
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{$WARNING TODO!}
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{ SysResumeThread := WinResumeThread(threadHandle);
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}
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end;
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function SysKillThread (ThreadHandle: dword): dword;
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var
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ExitCode: dword;
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begin
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{$WARNING TODO!}
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{
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if not TerminateThread (ThreadHandle, ExitCode) then
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SysKillThread := GetLastError
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else
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SysKillThread := 0;
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}
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end;
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function SysCloseThread (threadHandle : TThreadID) : dword;
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begin
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// SysCloseThread:=CloseHandle(threadHandle);
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end;
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function SysWaitForThreadTerminate (ThreadHandle: dword;
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TimeoutMs: longint): dword;
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begin
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{$WARNING TODO!}
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{
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if TimeoutMs = 0 then dec (timeoutMs); // $ffffffff is INFINITE
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SysWaitForThreadTerminate := WaitForSingleObject(threadHandle, TimeoutMs);
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}
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end;
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function SysThreadSetPriority (ThreadHandle: dword;
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Prio: longint): boolean;
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{-15..+15, 0=normal}
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begin
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{$WARNING TODO!}
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{
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SysThreadSetPriority:=WinThreadSetPriority(threadHandle,Prio);
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}
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end;
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function SysThreadGetPriority (ThreadHandle: dword): longint;
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begin
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{$WARNING TODO!}
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{
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SysThreadGetPriority:=WinThreadGetPriority(threadHandle);
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}
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end;
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function SysGetCurrentThreadID: dword;
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begin
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{$WARNING TODO!}
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{
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SysGetCurrentThreadId:=WinGetCurrentThreadId;
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}
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end;
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{*****************************************************************************
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Delphi/Win32 compatibility
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*****************************************************************************}
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{ DosEnter/ExitCritSec have quite a few limitations, so let's try to avoid
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them. I'm not sure whether mutex semaphores are SMP-safe, though... :-( }
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procedure SysInitCriticalSection(var CS);
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begin
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{$WARNING TODO!}
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end;
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procedure SysDoneCriticalSection (var CS);
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begin
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{$WARNING TODO!}
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end;
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procedure SysEnterCriticalSection (var CS);
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begin
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{$WARNING TODO!}
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end;
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procedure SysLeaveCriticalSection (var CS);
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begin
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{$WARNING TODO!}
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end;
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type
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TBasicEventState = record
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FHandle: THandle;
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FLastError: longint;
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end;
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PLocalEventRec = ^TBasicEventState;
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function IntBasicEventCreate (EventAttributes: Pointer;
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AManualReset, InitialState: Boolean; const Name: ansistring): PEventState;
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begin
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New (PLocalEventRec (Result));
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{$WARNING TODO!}
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{
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PLocalEventrec (Result)^.FHandle :=
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CreateEvent (EventAttributes, AManualReset, InitialState,PChar(Name));
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}
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end;
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procedure IntBasicEventDestroy (State: PEventState);
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begin
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{$WARNING TODO!}
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{
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closehandle(plocaleventrec(state)^.fhandle);
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}
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Dispose (PLocalEventRec (State));
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end;
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procedure IntBasicEventResetEvent (State: PEventState);
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begin
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{$WARNING TODO!}
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{
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ResetEvent(plocaleventrec(state)^.FHandle)
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}
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end;
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procedure IntBasicEventSetEvent (State: PEventState);
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begin
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{$WARNING TODO!}
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{
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SetEvent(plocaleventrec(state)^.FHandle);
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}
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end;
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function IntBasicEventWaitFor (Timeout: Cardinal; State: PEventState): longint;
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begin
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{$WARNING TODO!}
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{
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case WaitForSingleObject(plocaleventrec(state)^.fHandle, Timeout) of
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WAIT_ABANDONED: Result := wrAbandoned;
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WAIT_OBJECT_0: Result := wrSignaled;
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WAIT_TIMEOUT: Result := wrTimeout;
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WAIT_FAILED:
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begin
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Result := wrError;
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plocaleventrec(state)^.FLastError := GetLastError;
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end;
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else
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Result := wrError;
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end;
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}
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end;
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function IntRTLEventCreate: PRTLEvent;
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begin
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{$WARNING TODO!}
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{
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Result := PRTLEVENT(CreateEvent(nil, false, false, nil));
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}
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end;
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procedure IntRTLEventDestroy (AEvent: PRTLEvent);
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begin
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{$WARNING TODO!}
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{
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CloseHandle(THANDLE(AEvent));
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}
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end;
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procedure IntRTLEventSetEvent (AEvent: PRTLEvent);
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begin
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{$WARNING TODO!}
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{
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SetEvent(THANDLE(AEvent));
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}
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end;
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CONST INFINITE=-1;
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procedure IntRTLEventWaitFor (AEvent: PRTLEvent);
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begin
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{$WARNING TODO!}
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{
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WaitForSingleObject(THANDLE(AEvent), INFINITE);
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}
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end;
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var
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OS2ThreadManager: TThreadManager;
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procedure InitSystemThreads;
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begin
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with OS2ThreadManager do
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begin
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InitManager :=Nil;
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DoneManager :=Nil;
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BeginThread :=@SysBeginThread;
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EndThread :=@SysEndThread;
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SuspendThread :=@SysSuspendThread;
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ResumeThread :=@SysResumeThread;
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KillThread :=@SysKillThread;
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ThreadSwitch :=@SysThreadSwitch;
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WaitForThreadTerminate :=@SysWaitForThreadTerminate;
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ThreadSetPriority :=@SysThreadSetPriority;
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ThreadGetPriority :=@SysThreadGetPriority;
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CloseThrad :=@SysCloseThread;
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GetCurrentThreadId :=@SysGetCurrentThreadId;
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InitCriticalSection :=@SysInitCriticalSection;
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DoneCriticalSection :=@SysDoneCriticalSection;
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EnterCriticalSection :=@SysEnterCriticalSection;
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LeaveCriticalSection :=@SysLeaveCriticalSection;
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InitThreadVar :=@SysInitThreadVar;
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RelocateThreadVar :=@SysRelocateThreadVar;
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AllocateThreadVars :=@SysAllocateThreadVars;
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ReleaseThreadVars :=@SysReleaseThreadVars;
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BasicEventCreate :=@IntBasicEventCreate;
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BasicEventDestroy :=@IntBasicEventDestroy;
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BasicEventResetEvent :=@IntBasicEventResetEvent;
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BasicEventSetEvent :=@IntBasicEventSetEvent;
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BasiceventWaitFor :=@IntBasiceventWaitFor;
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RTLEventCreate :=@IntRTLEventCreate;
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RTLEventDestroy :=@IntRTLEventDestroy;
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RTLEventSetEvent :=@IntRTLEventSetEvent;
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RTLEventWaitFor :=@IntRTLEventWaitFor;
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end;
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SetThreadManager (OS2ThreadManager);
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end;
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