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https://gitlab.com/freepascal.org/fpc/source.git
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38a63b01f0
support. Still problems left in fexpand. (inoutres?) Therefore fixed sysposix not yet commited
395 lines
11 KiB
ObjectPascal
395 lines
11 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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unit systhrds;
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interface
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{$S-}
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{$ifndef BSD}
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{$linklib c}
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{$linklib pthread}
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{$else}
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// Link reentrant libc with pthreads
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{$linklib c_r}
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{$endif}
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type
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PRTLCriticalSection = ^TRTLCriticalSection;
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TRTLCriticalSection = record
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m_spinlock : longint;
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m_count : longint;
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m_owner : pointer {pthread_t};
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m_kind : longint;
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m_waiting : record
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head,tail : pointer;
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end; {_pthread_queue}
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end;
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{ Include generic thread interface }
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{$i threadh.inc}
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implementation
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{*****************************************************************************
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Generic overloaded
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*****************************************************************************}
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{ Include generic overloaded routines }
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{$i thread.inc}
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{$ifndef BSD}
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{$i pthreads.inc}
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{$else}
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{$i ptypes.inc}
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CONST PTHREAD_EXPLICIT_SCHED = 0;
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PTHREAD_CREATE_DETACHED = 1;
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PTHREAD_SCOPE_PROCESS = 0;
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TYPE
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pthread_t = pointer;
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ppthread_t = ^pthread_t;
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pthread_key_t = cint;
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ppthread_key_t = ^pthread_key_t;
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pthread_mutex_t = pointer;
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ppthread_mutex_t= ^pthread_mutex_t;
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pthread_attr_t = pointer; // opague
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ppthread_attr_t = ^pthread_attr_t; // opague
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__destr_func_t = procedure (p :pointer);cdecl;
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__startroutine_t= function (p :pointer):pointer;cdecl;
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pthread_mutex_attr_t = pointer;
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ppthread_mutex_attr_t = ^pthread_mutex_t;
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function pthread_getspecific (t : pthread_key_t):pointer; cdecl; external;
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function pthread_setspecific (t : pthread_key_t;p:pointer):cint; cdecl; external;
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function pthread_key_create (p : ppthread_key_t;f: __destr_func_t):cint; cdecl;external;
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function pthread_attr_init (p : ppthread_key_t):cint; cdecl; external;
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function pthread_attr_setinheritsched(p : ppthread_attr_t;i:cint):cint; cdecl; external;
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function pthread_attr_setscope (p : ppthread_attr_t;i:cint):cint;cdecl;external;
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function pthread_attr_setdetachstate (p : ppthread_attr_t;i:cint):cint;cdecl;external;
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function pthread_create ( p: ppthread_t;attr : ppthread_attr_t;f:__startroutine_t;arg:pointer):cint;cdecl;external;
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procedure pthread_exit ( p: pointer); cdecl;external;
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function pthread_mutex_init (p:ppthread_mutex_t;o:ppthread_mutex_attr_t):cint; cdecl;external;
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function pthread_mutex_destroy (p:ppthread_mutex_attr_t):cint; cdecl;external;
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function pthread_mutex_lock (p:ppthread_mutex_attr_t):cint; cdecl;external;
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function pthread_mutex_unlock (p:ppthread_mutex_attr_t):cint; cdecl;external;
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{$endif}
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{*****************************************************************************
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System dependent memory allocation
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*****************************************************************************}
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{$ifndef BSD}
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const
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syscall_nr_mmap = 90;
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syscall_nr_munmap = 91;
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{ Constansts for MMAP }
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MAP_PRIVATE =2;
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MAP_ANONYMOUS =$20;
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type
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SysCallRegs=record
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reg1,reg2,reg3,reg4,reg5,reg6 : longint;
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end;
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var
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Errno : longint;
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{ Include syscall itself }
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{$i syscall.inc}
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Function Sys_mmap(adr,len,prot,flags,fdes,off:longint):longint;
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type
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tmmapargs=packed record
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address : longint;
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size : longint;
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prot : longint;
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flags : longint;
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fd : longint;
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offset : longint;
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end;
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var
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t : syscallregs;
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mmapargs : tmmapargs;
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begin
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mmapargs.address:=adr;
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mmapargs.size:=len;
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mmapargs.prot:=prot;
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mmapargs.flags:=flags;
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mmapargs.fd:=fdes;
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mmapargs.offset:=off;
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t.reg2:=longint(@mmapargs);
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Sys_mmap:=syscall(syscall_nr_mmap,t);
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end;
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Function Sys_munmap(adr,len:longint):longint;
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var
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t : syscallregs;
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begin
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t.reg2:=adr;
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t.reg3:=len;
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Sys_munmap:=syscall(syscall_nr_munmap,t);
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end;
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{$else}
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CONST
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{ Constansts for MMAP. These are still private for *BSD }
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MAP_PRIVATE =2;
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MAP_ANONYMOUS =$1000;
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// *BSD POSIX. Include headers to syscalls.
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{$I bsdsysch.inc}
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{$endif}
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{*****************************************************************************
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Threadvar support
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*****************************************************************************}
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{$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 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:=pthread_getspecific(tlskey)+Offset;
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end;
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procedure SysAllocateThreadVars;
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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(Sys_mmap(0,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 SysReleaseThreadVars;
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begin
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Sys_munmap(longint(pthread_getspecific(tlskey)),threadvarblocksize);
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end;
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{ Include OS independent Threadvar initialization }
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{$i threadvar.inc}
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{$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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{$ifdef HASTHREADVAR}
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SysReleaseThreadVars;
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{$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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begin
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{$ifdef HASTHREADVAR}
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{ Allocate local thread vars, this must be the first thing,
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because the exception management and io depends on threadvars }
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SysAllocateThreadVars;
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{$endif HASTHREADVAR}
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{ Copy parameter to local data }
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{$ifdef DEBUG_MT}
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writeln('New thread started, initialising ...');
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{$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 BeginThread(sa : Pointer;stacksize : dword;
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ThreadFunction : tthreadfunc;p : pointer;
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creationFlags : dword; var ThreadId : DWord) : 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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{$ifdef HASTHREADVAR}
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{ We're still running in single thread mode, setup the TLS }
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pthread_key_create(@TLSKey,nil);
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InitThreadVars(@SysRelocateThreadvar);
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{$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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pthread_attr_setscope(@thread_attr, PTHREAD_SCOPE_PROCESS);
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pthread_attr_setdetachstate(@thread_attr, PTHREAD_CREATE_DETACHED);
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pthread_create(@threadid, @thread_attr, @ThreadMain,ti);
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BeginThread:=threadid;
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end;
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procedure EndThread(ExitCode : DWord);
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begin
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DoneThread;
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pthread_exit(pointer(ExitCode));
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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 InitCriticalSection(var CS:TRTLCriticalSection);
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begin
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cs.m_spinlock:=0;
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cs.m_count:=0;
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cs.m_owner:=0;
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cs.m_kind:=1;
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cs.m_waiting.head:=0;
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cs.m_waiting.tail:=0;
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pthread_mutex_init(@CS,NIL);
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end;
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procedure EnterCriticalSection(var CS:TRTLCriticalSection);
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begin
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pthread_mutex_lock(@CS);
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end;
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procedure LeaveCriticalSection(var CS:TRTLCriticalSection);
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begin
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pthread_mutex_unlock(@CS);
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end;
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procedure DoneCriticalSection(var CS:TRTLCriticalSection);
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begin
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pthread_mutex_destroy(@CS);
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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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initialization
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InitHeapMutexes;
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end.
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{
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$Log$
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Revision 1.2 2002-10-18 12:19:59 marco
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* Fixes to get the generic *BSD RTL compiling again + fixes for thread
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support. Still problems left in fexpand. (inoutres?) Therefore fixed
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sysposix not yet commited
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Revision 1.1 2002/10/16 06:22:56 michael
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Threads renamed from threads to systhrds
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Revision 1.1 2002/10/14 19:39:17 peter
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* threads unit added for thread support
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}
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