Ichthyostega
8867ae55ad
GCC8 now spots and warns about such mismatches. And we should take such warnings seriously; code produced by the newer GCC versions tends to segfault, especially under -O2 and above, when a return statement is actually missing, even if the return value is actually not used at call site. Here, a functor to unlock the active "guard" is passed into a macro construct, which basically allows to abstract the various kinds of "guards", be it mutex, condition variable or the like. Seemingly, the intention was to deal with a failure when unlocking -- however all the real implementations prefer to kill the whole application without much ado.
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
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sectionlock.h - mutex state handle
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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
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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 sectionlock.h
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** Mutex state handle for locked code sections
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*/
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#ifndef LUMIERA_SECTIONLOCK_H
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#define LUMIERA_SECTIONLOCK_H
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#include <pthread.h>
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#include <nobug.h>
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typedef void
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(*lumiera_sectionlock_unlock_fn)(void*, struct nobug_flag* flag,
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struct nobug_resource_user** handle,
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const struct nobug_context ctx);
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/**
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* sectionlock used to manage the state of mutexes.
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*/
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struct lumiera_sectionlock_struct
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{
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void* lock;
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lumiera_sectionlock_unlock_fn unlock;
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NOBUG_IF_ALPHA(struct nobug_flag* flag);
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RESOURCE_USER (rh);
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};
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typedef struct lumiera_sectionlock_struct lumiera_sectionlock;
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typedef struct lumiera_sectionlock_struct* LumieraSectionlock;
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/* helper function for nobug */
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static inline void
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lumiera_sectionlock_ensureunlocked (LumieraSectionlock self)
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{
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ENSURE (!self->lock, "forgot to unlock");
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}
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/**
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* Unlock the lock hold in a SECTION
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* @internal
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* @param sectionname name used for the sectionlock instance
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* @param ... some extra code to execute
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*/
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#define LUMIERA_SECTION_UNLOCK_(section) \
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do if ((section)->lock) \
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{ \
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(section)->unlock((section)->lock, (section)->flag, \
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&(section)->rh, NOBUG_CONTEXT); \
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(section)->lock = NULL; \
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} while (0)
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#endif
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/*
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// Local Variables:
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// mode: C
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// c-file-style: "gnu"
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// indent-tabs-mode: nil
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// End:
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*/
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