152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/*
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FiledescriptorRegistry - registry for tracking all files in use
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Copyright (C) Lumiera.org
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2008, 2010, 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
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the 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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/** @file filedescriptorregistry.c
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** Implementation of a registry to manage used filedescriptors
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** @todo development in this area is stalled since 2010
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*/
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#include "include/logging.h"
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#include "lib/safeclib.h"
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#include "lib/mutex.h"
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#include "lib/psplay.h"
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#include "vault/file.h"
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#include "vault/filedescriptor.h"
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#include "vault/filedescriptorregistry.h"
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/**
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* the global registry for file descriptors.
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*/
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static PSplay filedescriptorregistry = NULL;
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static lumiera_mutex filedescriptorregistry_mutex;
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static int
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cmp_fn (const void* keya, const void* keyb)
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{
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const LumieraFiledescriptor a = (const LumieraFiledescriptor)keya;
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const LumieraFiledescriptor b = (const LumieraFiledescriptor)keyb;
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if (a->stat.st_dev < b->stat.st_dev)
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return -1;
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else if (a->stat.st_dev > b->stat.st_dev)
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return 1;
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if (a->stat.st_ino < b->stat.st_ino)
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return -1;
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else if (a->stat.st_ino > b->stat.st_ino)
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return 1;
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if ((a->flags&LUMIERA_FILE_MASK) < (b->flags&LUMIERA_FILE_MASK))
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return -1;
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else if ((a->flags&LUMIERA_FILE_MASK) > (b->flags&LUMIERA_FILE_MASK))
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return 1;
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return 0;
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}
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static void
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delete_fn (PSplaynode node)
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{
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TODO ("figure name out? or is the handle here always closed");
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lumiera_filedescriptor_delete ((LumieraFiledescriptor) node, NULL);
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}
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static const void*
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key_fn (const PSplaynode node)
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{
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return node;
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}
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void
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lumiera_filedescriptorregistry_init (void)
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{
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TRACE (filedescriptor_dbg);
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REQUIRE (!filedescriptorregistry);
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filedescriptorregistry = psplay_new (cmp_fn, key_fn, delete_fn);
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if (!filedescriptorregistry)
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LUMIERA_DIE (NO_MEMORY);
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lumiera_mutex_init (&filedescriptorregistry_mutex, "filedescriptorregistry", &NOBUG_FLAG (mutex_dbg), NOBUG_CONTEXT);
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}
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void
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lumiera_filedescriptorregistry_destroy (void)
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{
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TRACE (filedescriptor_dbg);
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REQUIRE (!psplay_nelements (filedescriptorregistry));
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lumiera_mutex_destroy (&filedescriptorregistry_mutex, &NOBUG_FLAG (mutex_dbg), NOBUG_CONTEXT);
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if (filedescriptorregistry)
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psplay_delete (filedescriptorregistry);
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filedescriptorregistry = NULL;
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}
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LumieraFiledescriptor
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lumiera_filedescriptorregistry_ensure (LumieraFiledescriptor template)
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{
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REQUIRE (filedescriptorregistry, "not initialised");
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LumieraFiledescriptor ret = NULL;
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LUMIERA_MUTEX_SECTION (mutex_sync, &filedescriptorregistry_mutex)
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{
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/* lookup/create descriptor */
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ret = (LumieraFiledescriptor) psplay_find (filedescriptorregistry, template, 100);
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if (!ret)
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{
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ret = lumiera_filedescriptor_new (template);
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if (!ret)
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goto error;
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psplay_insert (filedescriptorregistry, &ret->node, 100);
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}
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error:
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;
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}
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return ret;
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}
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void
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lumiera_filedescriptorregistry_remove (LumieraFiledescriptor self)
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{
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LUMIERA_MUTEX_SECTION (mutex_sync, &filedescriptorregistry_mutex)
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psplay_remove (filedescriptorregistry, &self->node);
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}
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