Przemek:
Do you have answer about this ?
David Macias
[Przemek]
../../thread.c(1240): Error! E029: col(60) symbol '_gettid' has not
been declared
_gettid() is GCC local function.
I do not see function which returns directly thread ID in OS2 API.
Probably it can be extracted from TIB structure returned by
DosGetInfoBlocks(). I cannot find simpler method. Maurilio can you help?
[Maurilio]
I've not tested this code, but something like this should give you
the thread id.
unsigned long _gettid()
{
PTIB ptib = NULL;
APIRET rc;
rc = DosGetInfoBlocks(&ptib, NULL);
return ptib->tib_ptib2->tib2_ultid;
}
Hope this help.
[Przemek]
Yes, thanks. I hoped that maybe there is simpler version then using
DosGetInfoBlocks() but we can also use this. Thank you very much.
Przemek, Maurilio:
I do not know if it is what you are looking for
I found in different places of documentation included in OW
---------
The macro _threadid can be used to determine the current thread
identifier.
---------
The _threadid macro can be used to determine the current thread
identifier. It is defined as follows.
int *__threadid(void);
#define _threadid (__threadid())
The header file stddef.h contains the definition of the _threadid macro.
---------
_threadid
Prototype in <stddef.h>.
This variable/function may be used to obtain the id of the current
thread which is an int. In the 32-bit libraries, _threadid is a
function that returns a pointer to an int. In the 16-bit libraries,
_threadid is a far pointer to an int. Note that the value stored where
_threadid points does not necessarily change when a thread context
switch occurs (so do not make a copy of the pointer ... it may change).
To obtain the current thread identifier, simply code:
int tid = *_threadid;
-------------
So I tried in source\vm\thread.c
---------------
#if defined( HB_OS_OS2 )
#include <stddef.h> <---- David was here !
ULONG _hb_gettid( void )
{
ULONG tid = 0;
PTIB ptib = NULL;
printf( "_hb_gettid()\r\n", tid ); fflush(stdout);
/* <---- David was here !
if( DosGetInfoBlocks( &ptib, NULL ) == NO_ERROR )
{
if( ! ptib )
{ printf( "ptib is NULL\r\n" ); fflush(stdout); }
else if( !ptib->tib_ptib2 )
{ printf( "ptib->tib_ptib2 is NULL\r\n" ); fflush(stdout); }
else
tid = ptib->tib_ptib2->tib2_ultid;
}
*/
tid = *_threadid; <---- David was here !
printf( "TID=%lu\r\n", tid ); fflush(stdout);
return tid;
}
#endif
---------------
and mttest02.exe result with values TID=1, 2
---------------
[...]
_hb_gettid()
TID=1
1. hb_threadMutexLock()
_hb_gettid()
TID=2
[...]
---------------
So if _threadid is useful giving same value as GCC _gettid(), then
_hb_gettid() can be discarded and use in harbour\include\hbthread.h:
-----------
//discard
extern ULONG _hb_gettid( void );
# if defined( __GNUC__ )
# define HB_THREAD_SELF() ( ( TID ) _gettid() )
# else
// case for OpenWatcom
// Use something like
#include <stddef.h> <---- David was here !
tid = *_threadid; <---- David was here !
int vs ULONG ?
In the 32-bit libraries, _threadid is a function that returns a pointer
to an int
# else
//discard
# define HB_THREAD_SELF() ( ( TID ) _hb_gettid() )
# endif
-----------
And in this case ( thread ID ) what is happening/using in Windows
OpenWatcom ? It can be used in OS/2 Watcom ?
David Macias
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