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103 lines
2.6 KiB
C
103 lines
2.6 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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* Pthreads4w - POSIX Threads for Windows
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* Copyright 1998 John E. Bossom
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* Copyright 1999-2018, Pthreads4w contributors
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*
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* Homepage: https://sourceforge.net/projects/pthreads4w/
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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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*
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* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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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 *)(&((__ptw32_thread_t *)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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#if ! defined (__PTW32_BUILD_INLINED)
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/*
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* Avoid "translation unit is empty" warnings
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*/
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typedef int foo;
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#endif
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