82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
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error.c - Lumiera Error handling
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Copyright (C) Lumiera.org
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2008, Christian Thaeter <ct@pipapo.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <pthread.h>
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#include "lib/error.h"
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/**
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* @file C Error handling in Lumiera.
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*/
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/*
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predefined errors
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*/
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LUMIERA_ERROR_DEFINE (ERRNO, "errno");
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/* Thread local storage */
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static pthread_key_t lumiera_error_tls;
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static pthread_once_t lumiera_error_initialized = PTHREAD_ONCE_INIT;
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static void
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lumiera_error_tls_init (void)
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{
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pthread_key_create (&lumiera_error_tls, NULL);
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}
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/**
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* Set error state for the current thread.
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* If the error state of the current thread was cleared, then set it, else preserve the old state.
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* @param nerr name of the error with 'LUMIERA_ERROR_' prefix (example: LUMIERA_ERROR_NO_MEMORY)
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* @return old state, that is NULL for success, when the state was cleared and a pointer to a pending
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* error when the error state was already set
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*/
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const char*
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lumiera_error_set (const char * nerr)
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{
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pthread_once (&lumiera_error_initialized, lumiera_error_tls_init);
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const char* err = pthread_getspecific (lumiera_error_tls);
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if (!err)
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pthread_setspecific (lumiera_error_tls, nerr);
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return err;
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}
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/**
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* Get and clear current error state.
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* This function clears the error state, if it needs to be reused, one has to store it in a temporary
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* variable.
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* @return pointer to any pending error of this thread, NULL if no error is pending
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*/
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const char*
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lumiera_error ()
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{
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pthread_once (&lumiera_error_initialized, lumiera_error_tls_init);
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const char* err = pthread_getspecific (lumiera_error_tls);
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if (err)
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pthread_setspecific (lumiera_error_tls, NULL);
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return err;
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}
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