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649 lines
17 KiB
ObjectPascal
649 lines
17 KiB
ObjectPascal
{
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$Id$
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This file is part of the Free Pascal run time library.
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Copyright (c) 2002 by Peter Vreman,
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member of the Free Pascal development team.
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Linux (pthreads) 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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{$mode objfpc}
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{$ifdef linux}
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{$define dynpthreads} // Useless on BSD, since they are in libc
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{$endif}
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unit cthreads;
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interface
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{$S-}
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{$ifndef dynpthreads} // If you have problems compiling this on FreeBSD 5.x
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{$linklib c} // try adding -Xf
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{$ifndef Darwin}
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{$linklib pthread}
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{$endif darwin}
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{$endif}
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Procedure SetCThreadManager;
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implementation
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Uses
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BaseUnix,
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unix,
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unixtype,
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sysutils
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{$ifdef dynpthreads}
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,dl
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{$endif}
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;
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{*****************************************************************************
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Generic overloaded
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*****************************************************************************}
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{ Include OS specific parts. }
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{$i pthread.inc}
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Type PINTRTLEvent = ^TINTRTLEvent;
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TINTRTLEvent = record
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condvar: pthread_cond_t;
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mutex: pthread_mutex_t;
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end;
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{*****************************************************************************
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Threadvar support
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*****************************************************************************}
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{$ifdef HASTHREADVAR}
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const
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threadvarblocksize : dword = 0;
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var
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TLSKey : pthread_key_t;
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procedure CInitThreadvar(var offset : dword;size : dword);
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begin
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{$ifdef cpusparc}
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threadvarblocksize:=align(threadvarblocksize,16);
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{$endif cpusparc}
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{$ifdef cpupowerpc}
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threadvarblocksize:=align(threadvarblocksize,8);
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{$endif cpupowerc}
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{$ifdef cpui386}
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threadvarblocksize:=align(threadvarblocksize,8);
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{$endif cpui386}
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{$ifdef cpuarm}
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threadvarblocksize:=align(threadvarblocksize,4);
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{$endif cpuarm}
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{$ifdef cpum68k}
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threadvarblocksize:=align(threadvarblocksize,2);
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{$endif cpum68k}
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{$ifdef cpux86_64}
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threadvarblocksize:=align(threadvarblocksize,16);
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{$endif cpux86_64}
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offset:=threadvarblocksize;
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inc(threadvarblocksize,size);
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end;
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function CRelocateThreadvar(offset : dword) : pointer;
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begin
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CRelocateThreadvar:=pthread_getspecific(tlskey)+Offset;
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end;
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procedure CAllocateThreadVars;
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var
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dataindex : pointer;
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begin
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{ we've to allocate the memory from system }
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{ because the FPC heap management uses }
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{ exceptions which use threadvars but }
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{ these aren't allocated yet ... }
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{ allocate room on the heap for the thread vars }
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DataIndex:=Pointer(Fpmmap(nil,threadvarblocksize,3,MAP_PRIVATE+MAP_ANONYMOUS,-1,0));
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FillChar(DataIndex^,threadvarblocksize,0);
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pthread_setspecific(tlskey,dataindex);
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end;
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procedure CReleaseThreadVars;
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begin
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{$ifdef ver1_0}
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Fpmunmap(longint(pthread_getspecific(tlskey)),threadvarblocksize);
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{$else}
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Fpmunmap(pointer(pthread_getspecific(tlskey)),threadvarblocksize);
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{$endif}
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end;
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{ Include OS independent Threadvar initialization }
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{$endif HASTHREADVAR}
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{*****************************************************************************
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Thread starting
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*****************************************************************************}
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type
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pthreadinfo = ^tthreadinfo;
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tthreadinfo = record
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f : tthreadfunc;
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p : pointer;
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stklen : cardinal;
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end;
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procedure DoneThread;
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begin
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{ Release Threadvars }
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{$ifdef HASTHREADVAR}
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CReleaseThreadVars;
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{$endif HASTHREADVAR}
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end;
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function ThreadMain(param : pointer) : pointer;cdecl;
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var
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ti : tthreadinfo;
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{$ifdef DEBUG_MT}
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// in here, don't use write/writeln before having called
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// InitThread! I wonder if anyone ever debugged these routines,
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// because they will have crashed if DEBUG_MT was enabled!
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// this took me the good part of an hour to figure out
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// why it was crashing all the time!
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// this is kind of a workaround, we simply write(2) to fd 0
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s: string[100]; // not an ansistring
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{$endif DEBUG_MT}
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begin
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{$ifdef DEBUG_MT}
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s := 'New thread started, initing threadvars'#10;
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fpwrite(0,s[1],length(s));
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{$endif DEBUG_MT}
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{$ifdef HASTHREADVAR}
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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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CAllocateThreadVars;
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{$endif HASTHREADVAR}
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{ Copy parameter to local data }
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{$ifdef DEBUG_MT}
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s := 'New thread started, initialising ...'#10;
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fpwrite(0,s[1],length(s));
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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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{$endif DEBUG_MT}
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ThreadMain:=pointer(ti.f(ti.p));
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DoneThread;
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pthread_detach(pthread_t(pthread_self()));
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end;
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function CBeginThread(sa : Pointer;stacksize : dword;
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ThreadFunction : tthreadfunc;p : pointer;
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creationFlags : dword; var ThreadId : THandle) : DWord;
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var
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ti : pthreadinfo;
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thread_attr : pthread_attr_t;
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begin
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{$ifdef DEBUG_MT}
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writeln('Creating new thread');
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{$endif DEBUG_MT}
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{ Initialize multithreading if not done }
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if not IsMultiThread then
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begin
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{$ifdef HASTHREADVAR}
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{ We're still running in single thread mode, setup the TLS }
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pthread_key_create(@TLSKey,nil);
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InitThreadVars(@CRelocateThreadvar);
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{$endif HASTHREADVAR}
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IsMultiThread:=true;
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end;
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{ the only way to pass data to the newly created thread
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in a MT safe way, is to use the heap }
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new(ti);
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ti^.f:=ThreadFunction;
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ti^.p:=p;
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ti^.stklen:=stacksize;
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{ call pthread_create }
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{$ifdef DEBUG_MT}
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writeln('Starting new thread');
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{$endif DEBUG_MT}
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pthread_attr_init(@thread_attr);
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pthread_attr_setinheritsched(@thread_attr, PTHREAD_EXPLICIT_SCHED);
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// will fail under linux -- apparently unimplemented
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pthread_attr_setscope(@thread_attr, PTHREAD_SCOPE_PROCESS);
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// don't create detached, we need to be able to join (waitfor) on
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// the newly created thread!
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//pthread_attr_setdetachstate(@thread_attr, PTHREAD_CREATE_DETACHED);
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if pthread_create(@threadid, @thread_attr, @ThreadMain,ti) <> 0 then begin
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threadid := 0;
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end;
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CBeginThread:=threadid;
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{$ifdef DEBUG_MT}
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writeln('BeginThread returning ',CBeginThread);
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{$endif DEBUG_MT}
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end;
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procedure CEndThread(ExitCode : DWord);
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begin
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DoneThread;
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pthread_detach(pthread_t(pthread_self()));
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pthread_exit(pointer(ptrint(ExitCode)));
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end;
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{$warning threadhandle can be larger than a dword}
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function CSuspendThread (threadHandle : dword) : dword;
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begin
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{$Warning SuspendThread needs to be implemented}
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end;
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{$warning threadhandle can be larger than a dword}
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function CResumeThread (threadHandle : dword) : dword;
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begin
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{$Warning ResumeThread needs to be implemented}
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end;
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procedure CThreadSwitch; {give time to other threads}
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begin
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{extern int pthread_yield (void) __THROW;}
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{$Warning ThreadSwitch needs to be implemented}
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end;
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{$warning threadhandle can be larger than a dword}
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function CKillThread (threadHandle : dword) : dword;
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begin
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pthread_detach(pthread_t(threadHandle));
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CKillThread := pthread_cancel(pthread_t(threadHandle));
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end;
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{$warning threadhandle can be larger than a dword}
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function CWaitForThreadTerminate (threadHandle : dword; TimeoutMs : longint) : dword; {0=no timeout}
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var
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LResultP: Pointer;
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LResult: DWord;
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begin
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LResult := 0;
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LResultP := @LResult;
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pthread_join(pthread_t(threadHandle), @LResultP);
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CWaitForThreadTerminate := LResult;
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end;
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{$warning threadhandle can be larger than a dword}
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function CThreadSetPriority (threadHandle : dword; Prio: longint): boolean; {-15..+15, 0=normal}
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begin
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{$Warning ThreadSetPriority needs to be implemented}
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end;
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{$warning threadhandle can be larger than a dword}
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function CThreadGetPriority (threadHandle : dword): Integer;
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begin
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{$Warning ThreadGetPriority needs to be implemented}
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end;
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{$warning threadhandle can be larger than a dword}
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function CGetCurrentThreadId : dword;
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begin
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CGetCurrentThreadId:=dword(pthread_self());
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end;
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{*****************************************************************************
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Delphi/Win32 compatibility
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*****************************************************************************}
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procedure CInitCriticalSection(var CS);
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var
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MAttr : pthread_mutexattr_t;
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res: longint;
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begin
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res:=pthread_mutexattr_init(@MAttr);
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if res=0 then
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begin
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res:=pthread_mutexattr_settype(@MAttr,longint(_PTHREAD_MUTEX_RECURSIVE));
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if res=0 then
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res := pthread_mutex_init(@CS,@MAttr)
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else
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{ No recursive mutex support :/ }
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res := pthread_mutex_init(@CS,NIL);
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end
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else
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res:= pthread_mutex_init(@CS,NIL);
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pthread_mutexattr_destroy(@MAttr);
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if res <> 0 then
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runerror(6);
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end;
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procedure CEnterCriticalSection(var CS);
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begin
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if pthread_mutex_lock(@CS) <> 0 then
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runerror(6);
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end;
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procedure CLeaveCriticalSection(var CS);
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begin
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if pthread_mutex_unlock(@CS) <> 0 then
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runerror(6)
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end;
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procedure CDoneCriticalSection(var CS);
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begin
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if pthread_mutex_destroy(@CS) <> 0 then
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runerror(6);
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end;
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{*****************************************************************************
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Heap Mutex Protection
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*****************************************************************************}
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var
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HeapMutex : pthread_mutex_t;
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procedure PThreadHeapMutexInit;
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begin
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pthread_mutex_init(@heapmutex,nil);
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end;
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procedure PThreadHeapMutexDone;
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begin
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pthread_mutex_destroy(@heapmutex);
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end;
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procedure PThreadHeapMutexLock;
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begin
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pthread_mutex_lock(@heapmutex);
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end;
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procedure PThreadHeapMutexUnlock;
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begin
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pthread_mutex_unlock(@heapmutex);
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end;
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const
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PThreadMemoryMutexManager : TMemoryMutexManager = (
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MutexInit : @PThreadHeapMutexInit;
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MutexDone : @PThreadHeapMutexDone;
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MutexLock : @PThreadHeapMutexLock;
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MutexUnlock : @PThreadHeapMutexUnlock;
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);
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procedure InitHeapMutexes;
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begin
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SetMemoryMutexManager(PThreadMemoryMutexManager);
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end;
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type
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TPthreadMutex = pthread_mutex_t;
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Tbasiceventstate=record
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FSem: Pointer;
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FManualReset: Boolean;
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FEventSection: TPthreadMutex;
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end;
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plocaleventstate = ^tbasiceventstate;
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// peventstate=pointer;
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Const
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wrSignaled = 0;
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wrTimeout = 1;
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wrAbandoned= 2;
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wrError = 3;
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function IntBasicEventCreate(EventAttributes : Pointer; AManualReset,InitialState : Boolean;const Name : ansistring):pEventState;
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var
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MAttr : pthread_mutexattr_t;
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res : cint;
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begin
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new(plocaleventstate(result));
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plocaleventstate(result)^.FManualReset:=AManualReset;
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plocaleventstate(result)^.FSem:=New(PSemaphore); //sem_t.
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// plocaleventstate(result)^.feventsection:=nil;
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res:=pthread_mutexattr_init(@MAttr);
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if res=0 then
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begin
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res:=pthread_mutexattr_settype(@MAttr,longint(_PTHREAD_MUTEX_RECURSIVE));
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if Res=0 then
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Res:=pthread_mutex_init(@plocaleventstate(result)^.feventsection,@MAttr)
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else
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res:=pthread_mutex_init(@plocaleventstate(result)^.feventsection,nil);
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end
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else
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res:=pthread_mutex_init(@plocaleventstate(result)^.feventsection,nil);
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pthread_mutexattr_destroy(@MAttr);
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if res <> 0 then
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runerror(6);
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if sem_init(psem_t(plocaleventstate(result)^.FSem),ord(False),Ord(InitialState)) <> 0 then
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runerror(6);
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end;
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procedure Intbasiceventdestroy(state:peventstate);
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begin
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sem_destroy(psem_t( plocaleventstate(state)^.FSem));
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end;
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procedure IntbasiceventResetEvent(state:peventstate);
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begin
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While sem_trywait(psem_t( plocaleventstate(state)^.FSem))=0 do
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;
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end;
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procedure IntbasiceventSetEvent(state:peventstate);
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Var
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Value : Longint;
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begin
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pthread_mutex_lock(@plocaleventstate(state)^.feventsection);
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Try
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sem_getvalue(plocaleventstate(state)^.FSem,@value);
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if Value=0 then
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sem_post(psem_t( plocaleventstate(state)^.FSem));
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finally
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pthread_mutex_unlock(@plocaleventstate(state)^.feventsection);
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end;
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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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If TimeOut<>Cardinal($FFFFFFFF) then
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result:=wrError
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else
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begin
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sem_wait(psem_t(plocaleventstate(state)^.FSem));
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result:=wrSignaled;
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if plocaleventstate(state)^.FManualReset then
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begin
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pthread_mutex_lock(@plocaleventstate(state)^.feventsection);
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Try
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intbasiceventresetevent(State);
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sem_post(psem_t( plocaleventstate(state)^.FSem));
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Finally
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pthread_mutex_unlock(@plocaleventstate(state)^.feventsection);
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end;
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end;
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end;
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end;
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function intRTLEventCreate: PRTLEvent;
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var p:pintrtlevent;
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begin
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new(p);
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pthread_cond_init(@p^.condvar, nil);
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pthread_mutex_init(@p^.mutex, nil);
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result:=PRTLEVENT(p);
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end;
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procedure intRTLEventDestroy(AEvent: PRTLEvent);
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var p:pintrtlevent;
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begin
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p:=pintrtlevent(aevent);
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pthread_cond_destroy(@p^.condvar);
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pthread_mutex_destroy(@p^.mutex);
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dispose(p);
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end;
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procedure intRTLEventSetEvent(AEvent: PRTLEvent);
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var p:pintrtlevent;
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begin
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p:=pintrtlevent(aevent);
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pthread_mutex_lock(@p^.mutex);
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pthread_cond_signal(@p^.condvar);
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pthread_mutex_unlock(@p^.mutex);
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end;
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procedure intRTLEventStartWait(AEvent: PRTLEvent);
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var p:pintrtlevent;
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begin
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p:=pintrtlevent(aevent);
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pthread_mutex_lock(@p^.mutex);
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end;
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procedure intRTLEventWaitFor(AEvent: PRTLEvent);
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var p:pintrtlevent;
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begin
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p:=pintrtlevent(aevent);
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pthread_cond_wait(@p^.condvar, @p^.mutex);
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pthread_mutex_unlock(@p^.mutex);
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end;
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type
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tthreadmethod = procedure of object;
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|
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Function CInitThreads : Boolean;
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begin
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{$ifdef DEBUG_MT}
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Writeln('Entering InitThreads.');
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{$endif}
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{$ifndef dynpthreads}
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Result:=True;
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{$else}
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Result:=LoadPthreads;
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{$endif}
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ThreadID := SizeUInt (pthread_self);
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{$ifdef DEBUG_MT}
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Writeln('InitThreads : ',Result);
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{$endif DEBUG_MT}
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end;
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Function CDoneThreads : Boolean;
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begin
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{$ifndef dynpthreads}
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Result:=True;
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{$else}
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Result:=UnloadPthreads;
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{$endif}
|
|
end;
|
|
|
|
|
|
Var
|
|
CThreadManager : TThreadManager;
|
|
|
|
Procedure SetCThreadManager;
|
|
|
|
begin
|
|
With CThreadManager do
|
|
begin
|
|
InitManager :=@CInitThreads;
|
|
DoneManager :=@CDoneThreads;
|
|
BeginThread :=@CBeginThread;
|
|
EndThread :=@CEndThread;
|
|
SuspendThread :=@CSuspendThread;
|
|
ResumeThread :=@CResumeThread;
|
|
KillThread :=@CKillThread;
|
|
ThreadSwitch :=@CThreadSwitch;
|
|
WaitForThreadTerminate :=@CWaitForThreadTerminate;
|
|
ThreadSetPriority :=@CThreadSetPriority;
|
|
ThreadGetPriority :=@CThreadGetPriority;
|
|
GetCurrentThreadId :=@CGetCurrentThreadId;
|
|
InitCriticalSection :=@CInitCriticalSection;
|
|
DoneCriticalSection :=@CDoneCriticalSection;
|
|
EnterCriticalSection :=@CEnterCriticalSection;
|
|
LeaveCriticalSection :=@CLeaveCriticalSection;
|
|
{$ifdef hasthreadvar}
|
|
InitThreadVar :=@CInitThreadVar;
|
|
RelocateThreadVar :=@CRelocateThreadVar;
|
|
AllocateThreadVars :=@CAllocateThreadVars;
|
|
ReleaseThreadVars :=@CReleaseThreadVars;
|
|
{$endif}
|
|
BasicEventCreate :=@intBasicEventCreate;
|
|
BasicEventDestroy :=@intBasicEventDestroy;
|
|
BasicEventResetEvent :=@intBasicEventResetEvent;
|
|
BasicEventSetEvent :=@intBasicEventSetEvent;
|
|
BasiceventWaitFor :=@intBasiceventWaitFor;
|
|
rtlEventCreate :=@intrtlEventCreate;
|
|
rtlEventDestroy :=@intrtlEventDestroy;
|
|
rtlEventSetEvent :=@intrtlEventSetEvent;
|
|
rtlEventStartWait :=@intrtlEventStartWait;
|
|
rtleventWaitFor :=@intrtleventWaitFor;
|
|
end;
|
|
SetThreadManager(CThreadManager);
|
|
InitHeapMutexes;
|
|
end;
|
|
|
|
|
|
initialization
|
|
SetCThreadManager;
|
|
finalization
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.24 2005-02-25 22:10:27 florian
|
|
* final fix for linux (hopefully)
|
|
|
|
Revision 1.23 2005/02/25 22:02:48 florian
|
|
* another "transfer to linux"-commit
|
|
|
|
Revision 1.22 2005/02/25 21:52:07 florian
|
|
* "transfer to linux"-commit
|
|
|
|
Revision 1.21 2005/02/14 17:13:31 peter
|
|
* truncate log
|
|
|
|
Revision 1.20 2005/02/06 11:20:52 peter
|
|
* threading in system unit
|
|
* removed systhrds unit
|
|
|
|
}
|
|
|