From: terekhov (terekhov_at_[hidden])
Date: 2002-01-16 15:20:34
--- In boost_at_y..., "bill_kempf" <williamkempf_at_h...> wrote:
[...]
> > "Constructors
> >
> > thread();
> >
> > Effects: Constructs a thread object representing the current
> thread
> > of
> > execution.
> >
> > Postcondition: *this is non-joinable.
> >
> > Danger: *this is valid only within the current thread"
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Ahh. Sorry, I forgot I specified this in the documentation. This
> may be an overspecification on my part and easily fixed. I
probably
> specified this to make the Win32 implementation as fast as possible.
Do you mean GetCurrentThread pseudo handle?
The following is not that much slower and is
thread-shareable calling DuplicateHandle 0/1
times only:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/pthreads/misc.c?
rev=1.40&content-type=text/x-cvsweb-markup&cvsroot=pthreads-win32
int
pthread_equal (pthread_t t1, pthread_t t2)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function returns zero if t1 and t2 are equal, else
* returns nonzero
*
* PARAMETERS
* t1,
* t2
* references to an instances of thread_t
*
*
* DESCRIPTION
* This function returns nonzero if t1 and t2 are equal,
else
* returns zero.
*
* RESULTS
* non-zero if t1 and t2 refer to the same
thread,
* 0 t1 and t2 do not refer to the
same thread
*
* ------------------------------------------------------
*/
{
int result;
/*
* We also accept NULL == NULL - treating NULL as a thread
* for this special case, because there is no error that we can
return.
*/
result = ( ( t1 == t2 ) && ( t1 == NULL || ( t1->thread == t2-
>thread ) ) );
return (result);
} /* pthread_equal */
pthread_t
pthread_self (void)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function returns a reference to the current running
* thread.
*
* PARAMETERS
* N/A
*
*
* DESCRIPTION
* This function returns a reference to the current running
* thread.
*
* RESULTS
* pthread_t reference to the current thread
*
* ------------------------------------------------------
*/
{
pthread_t self;
#ifdef _UWIN
if(!ptw32_selfThreadKey)
return(NULL);
#endif
self = (pthread_t) pthread_getspecific (ptw32_selfThreadKey);
if (self == NULL)
{
/*
* Need to create an implicit 'self' for the currently
* executing thread.
*/
self = ptw32_new();
if (self != NULL)
{
/*
* This is a non-POSIX thread which has chosen to call
* a POSIX threads function for some reason. We assume that
* it isn't joinable, but we do assume that it's
* (deferred) cancelable.
*/
self->implicit = 1;
self->detachState = PTHREAD_CREATE_DETACHED;
self->thread = GetCurrentThreadId ();
#ifdef NEED_DUPLICATEHANDLE
/*
* DuplicateHandle does not exist on WinCE.
*
* NOTE:
* GetCurrentThread only returns a pseudo-handle
* which is only valid in the current thread context.
* Therefore, you should not pass the handle to
* other threads for whatever purpose.
*/
self->threadH = GetCurrentThread();
#else
if( !DuplicateHandle(
GetCurrentProcess(),
GetCurrentThread(),
GetCurrentProcess(),
&self->threadH,
0,
FALSE,
DUPLICATE_SAME_ACCESS ) )
{
free( self );
return (NULL);
}
#endif
}
pthread_setspecific (ptw32_selfThreadKey, self);
}
return (self);
} /* pthread_self */
regards,
alexander.