9169e0e94f
+ harbour/include/hbtask.h
+ harbour/source/vm/task.c
* harbour/include/hbthread.h
* harbour/include/hbatomic.h
* harbour/source/vm/thread.c
* harbour/source/vm/hvm.c
* harbour/source/vm/fm.c
* harbour/source/rtl/idle.c
* harbour/source/rtl/filesys.c
+ implemented OS independent task switching system - it gives PTHREAD
compatible basic API so it can be used in HVM as alternative MT support
which does not use any OS threads. As long as Harbour does not call
any blocking OS function then it's possible to create and execute
simultaneously many threads though only one CPU is used and switched
between HVM threads. It gives similar scalability to xbase++ threads
and also similar behavior in item protection at .prg level.
Now it's possible to use HVM threads in any OS.
Of course it does not mean that Harbour adds in some magic way
thread support to OS-es which does not support threads like DOS.
It only means that HVM supports threads for .prg code just like
in native MT environment as long as some C code does not block
task switching or process execution will not be frozen by sth, i.e.
executing other process (__run()) in single process OS like DOS.
In some cases it can be interesting alternative even in OS which
have native thread support.
All tests/mttest*.prg programs and speedtst --thread=<n> --scale
are executed correctly with new task switching just like with
OS native MT support.
Compilation with task switching in hbvmmt library can be forced
by HB_TASK_THREAD macro which also disable native OS threads
support.
For task context switching two alternative methods are used:
1) getcontext()/makecontext()/swapcontext() (SUSv2, POSIX.1-2001)
which is preferable because does not need any additional
hacks but not all OS-es supports these functions.
It's enabled by default in Linux builds.
2) setjmp()/longjmp() (POSIX, ISO 9899 (C99)) otherwise.
These functions are supported by most of C compilers
but there is no function to set new stack in saved context
so it's necessary to introduce for each architecure/C compiler
peace of code which makes it. Macro HB_TASK_STACK_INIT() in
task.c makes it. I defined this macro for x86@32 in DJGPP
Linux GCC and OpenWatcom builds. I tested OpenWatcom builds only
in DOS and Linux but probably it works in all x86@32 builds.
If someone is interesting in adding support for some other
platforms which does not support ucontext.h and 1-st methods
then please define above macro for them.
Have a fun with new toy ;-)
* harbour/source/vm/Makefile
* enabled hbvmmt in DJGPP and OpenWatcom DOS builds. It works well.
Viktor if possible please add support for -mt switch in hbmk2
in all builds even if we do not compile hbvmmt by default so
it can be used with DJGPP and OW and any other builds for which
someone enable hbtask.c though OS does not support threads.
* harbour/contrib/hbmzip/hbmzip.c
! fixed '[const] char|BYTE *' casting in DOS and OS2 builds
94 lines
3.6 KiB
C
94 lines
3.6 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* platform independent task system. It's used when when OS does not
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* support threads
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*
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* Copyright 2009 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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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. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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#ifndef HB_TASK_H_
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#define HB_TASK_H_
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#include "hbapi.h"
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HB_EXTERN_BEGIN
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extern void hb_taskInit( void );
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extern void hb_taskExit( void );
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extern void * hb_taskCreate( void * ( * ) ( void * ), void *, long );
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extern void hb_taskDestroy( void * );
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extern void hb_taskYield( void );
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extern void hb_taskSheduler( void );
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extern void hb_taskSuspend( void );
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extern void hb_taskResume( void * );
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extern void hb_taskSleep( unsigned long );
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extern void * hb_taskMain( void );
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extern void * hb_taskSelf( void );
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extern int hb_taskID( void * );
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extern void hb_taskSetData( void * );
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extern void * hb_taskGetData( void );
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extern void hb_taskSaveData( void *, void * );
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extern void * hb_taskRestoreData( void * );
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extern void * hb_taskResult( void * );
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extern int hb_taskJoin( void *, unsigned long, void ** );
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extern void hb_taskDetach( void * );
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extern void hb_taskQuit( void * );
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extern int hb_taskLock( void **, unsigned long );
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extern void hb_taskUnlock( void ** );
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extern void hb_taskSignal( void ** cond );
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extern void hb_taskBroadcast( void ** cond );
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extern int hb_taskWait( void ** cond, void ** mutex, unsigned long ulMilliSec );
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extern void hb_taskDestroyMutex( void ** );
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extern void hb_taskDestroyCond( void ** );
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#define HB_TASK_INFINITE_WAIT ( ( unsigned long ) -1 )
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HB_EXTERN_END
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#endif /* HB_TASK_H_ */
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