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/*
* pthread_self.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2012 Pthreads-win32 contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
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;
DWORD_PTR vThreadMask, vProcessMask, vSystemMask;
pthread_t nil = {NULL, 0};
ptw32_thread_t * sp;
if (!ptw32_processInitialize())
return nil;
#if defined(_UWIN)
if (!ptw32_selfThreadKey)
return nil;
#endif
sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey);
if (sp != NULL)
{
self = sp->ptHandle;
}
else
{
int fail = PTW32_FALSE;
/*
* Need to create an implicit 'self' for the currently
* executing thread.
*/
self = ptw32_new ();
sp = (ptw32_thread_t *) self.p;
if (sp != 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.
*/
sp->implicit = 1;
sp->detachState = PTHREAD_CREATE_DETACHED;
sp->thread = GetCurrentThreadId ();
#if defined(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.
*/
sp->threadH = GetCurrentThread ();
#else
if (!DuplicateHandle (GetCurrentProcess (),
GetCurrentThread (),
GetCurrentProcess (),
&sp->threadH,
0, FALSE, DUPLICATE_SAME_ACCESS))
{
fail = PTW32_TRUE;
}
#endif
/*
* Get this threads CPU affinity by temporarily setting the threads
* affinity to that of the process to get the old thread affinity,
* then reset to the old affinity.
*/
if (!fail)
{
if (GetProcessAffinityMask(GetCurrentProcess(), &vProcessMask, &vSystemMask))
{
vThreadMask = SetThreadAffinityMask(sp->threadH, vProcessMask);
if (vThreadMask)
{
if (SetThreadAffinityMask(sp->threadH, vThreadMask))
{
sp->cpuset = (size_t) vThreadMask;
}
else fail = PTW32_TRUE;
}
else fail = PTW32_TRUE;
}
else fail = PTW32_TRUE;
/*
* No need to explicitly serialise access to sched_priority
* because the new handle is not yet public.
*/
sp->sched_priority = GetThreadPriority (sp->threadH);
pthread_setspecific (ptw32_selfThreadKey, (void *) sp);
}
}
if (fail)
{
/*
* Thread structs are never freed but are reused so if this
* continues to fail at least we don't leak memory.
*/
sp->threadH = 0; // [i_a]
ptw32_threadReusePush (self);
/*
* As this is a win32 thread calling us and we have failed,
* return a value that makes sense to win32.
*/
return nil;
}
}
return (self);
}