94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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* errno.c
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*
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* Description:
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* This translation unit implements routines associated with spawning a new
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* thread.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#if defined(NEED_ERRNO)
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#include "pthread.h"
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#include "implement.h"
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static int reallyBad = ENOMEM;
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/*
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* Re-entrant errno.
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*
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* Each thread has it's own errno variable in pthread_t.
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*
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* The benefit of using the pthread_t structure
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* instead of another TSD key is TSD keys are limited
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* on Win32 to 64 per process. Secondly, to implement
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* it properly without using pthread_t you'd need
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* to dynamically allocate an int on starting the thread
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* and store it manually into TLS and then ensure that you free
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* it on thread termination. We get all that for free
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* by simply storing the errno on the pthread_t structure.
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*
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* MSVC and Mingw32 already have their own thread-safe errno.
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*
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* #if defined( _REENTRANT ) || defined( _MT )
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* #define errno *_errno()
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*
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* int *_errno( void );
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* #else
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* extern int errno;
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* #endif
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*
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*/
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int *
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_errno (void)
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{
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pthread_t self;
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int *result;
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if ((self = pthread_self ()).p == NULL)
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{
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/*
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* Yikes! unable to allocate a thread!
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* Throw an exception? return an error?
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*/
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result = &reallyBad;
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}
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else
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{
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result = (int *)(&self.p->exitStatus);
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}
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return (result);
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} /* _errno */
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#endif /* (NEED_ERRNO) */
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