| /* |
| * errno.c |
| * |
| * Description: |
| * This translation unit implements routines associated with spawning a new |
| * thread. |
| * |
| * -------------------------------------------------------------------------- |
| * |
| * Pthreads-win32 - POSIX Threads Library for Win32 |
| * Copyright(C) 1998 John E. Bossom |
| * Copyright(C) 1999,2005 Pthreads-win32 contributors |
| * |
| * Contact Email: rpj@callisto.canberra.edu.au |
| * |
| * 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 |
| */ |
| |
| #if defined(NEED_ERRNO) |
| |
| #include "pthread.h" |
| #include "implement.h" |
| |
| static int reallyBad = ENOMEM; |
| |
| /* |
| * Re-entrant errno. |
| * |
| * Each thread has it's own errno variable in pthread_t. |
| * |
| * The benefit of using the pthread_t structure |
| * instead of another TSD key is TSD keys are limited |
| * on Win32 to 64 per process. Secondly, to implement |
| * it properly without using pthread_t you'd need |
| * to dynamically allocate an int on starting the thread |
| * and store it manually into TLS and then ensure that you free |
| * it on thread termination. We get all that for free |
| * by simply storing the errno on the pthread_t structure. |
| * |
| * MSVC and Mingw32 already have their own thread-safe errno. |
| * |
| * #if defined( _REENTRANT ) || defined( _MT ) |
| * #define errno *_errno() |
| * |
| * int *_errno( void ); |
| * #else |
| * extern int errno; |
| * #endif |
| * |
| */ |
| |
| int * |
| _errno (void) |
| { |
| pthread_t self; |
| int *result; |
| |
| self = pthread_self (); |
| if (self.p == NULL) |
| { |
| /* |
| * Yikes! unable to allocate a thread! |
| * Throw an exception? return an error? |
| */ |
| result = &reallyBad; |
| } |
| else |
| { |
| result = &(((ptw32_thread_t*)(self.p))->ptErrno); |
| } |
| |
| return (result); |
| |
| } /* _errno */ |
| |
| #endif /* (NEED_ERRNO) */ |