132 lines
5.8 KiB
C
132 lines
5.8 KiB
C
/*
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recmutex.h - recursive mutal exclusion locking
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Copyright (C) Lumiera.org
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2008, 2009, 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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#ifndef LUMIERA_RECMUTEX_H
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#define LUMIERA_RECMUTEX_H
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#include "lib/error.h"
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#include "lib/sectionlock.h"
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#include <pthread.h>
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#include <nobug.h>
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/**
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* @file
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* Mutual exclusion locking, header.
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*/
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/**
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* Recursive Mutual exclusive section.
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*/
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#define LUMIERA_RECMUTEX_SECTION(nobugflag, mtx) \
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for (lumiera_sectionlock NOBUG_CLEANUP(lumiera_sectionlock_ensureunlocked) \
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lumiera_lock_section_ = { \
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(void*)1, lumiera_mutex_unlock_cb NOBUG_ALPHA_COMMA_NULL NOBUG_ALPHA_COMMA_NULL}; \
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lumiera_lock_section_.lock;) \
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for ( \
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({ \
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lumiera_lock_section_.lock = (mtx); \
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NOBUG_IF_ALPHA(lumiera_lock_section_.flag = &NOBUG_FLAG(nobugflag);) \
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RESOURCE_ENTER (nobugflag, (mtx)->rh, "acquire recmutex", &lumiera_lock_section_, \
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NOBUG_RESOURCE_WAITING, lumiera_lock_section_.rh); \
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if (pthread_mutex_lock (&(mtx)->recmutex)) \
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LUMIERA_DIE (LOCK_ACQUIRE); \
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RESOURCE_STATE (nobugflag, NOBUG_RESOURCE_RECURSIVE, lumiera_lock_section_.rh); \
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}); \
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lumiera_lock_section_.lock; \
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({ \
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LUMIERA_MUTEX_SECTION_UNLOCK; \
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}))
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#define LUMIERA_RECMUTEX_SECTION_CHAIN(nobugflag, mtx) \
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for (lumiera_sectionlock *lumiera_lock_section_old_ = &lumiera_lock_section_, \
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NOBUG_CLEANUP(lumiera_sectionlock_ensureunlocked) lumiera_lock_section_ = { \
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(void*)1, lumiera_mutex_unlock_cb NOBUG_ALPHA_COMMA_NULL NOBUG_ALPHA_COMMA_NULL}; \
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lumiera_lock_section_.lock;) \
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for ( \
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({ \
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REQUIRE (lumiera_lock_section_old_->lock, "section prematurely unlocked"); \
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lumiera_lock_section_.lock = (mtx); \
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NOBUG_IF_ALPHA(lumiera_lock_section_.flag = &NOBUG_FLAG(nobugflag);) \
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RESOURCE_ENTER (nobugflag, (mtx)->rh, "acquire recmutex", &lumiera_lock_section_, \
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NOBUG_RESOURCE_WAITING, lumiera_lock_section_.rh); \
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if (pthread_mutex_lock (&(mtx)->recmutex)) \
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LUMIERA_DIE (LOCK_ACQUIRE); \
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RESOURCE_STATE (nobugflag, NOBUG_RESOURCE_RECURSIVE, lumiera_lock_section_.rh); \
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LUMIERA_SECTION_UNLOCK_(lumiera_lock_section_old_) \
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}); \
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lumiera_lock_section_.lock; \
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({ \
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LUMIERA_MUTEX_SECTION_UNLOCK; \
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}))
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#define LUMIERA_RECMUTEX_SECTION_UNLOCK \
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LUMIERA_SECTION_UNLOCK_(&lumiera_lock_section_)
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/**
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* Mutex.
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*
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*/
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struct lumiera_recmutex_struct
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{
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pthread_mutex_t recmutex;
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RESOURCE_HANDLE (rh);
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};
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typedef struct lumiera_recmutex_struct lumiera_recmutex;
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typedef lumiera_recmutex* LumieraRecmutex;
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/**
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* Initialize a recursive mutex variable
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* Initializes a 'recursive' mutex which might be locked by the same thread multiple times.
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* @param self is a pointer to the mutex to be initialized
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* @return self as given
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*/
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LumieraRecmutex
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lumiera_recmutex_init (LumieraRecmutex self, const char* purpose, struct nobug_flag* flag);
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/**
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* Destroy a recursive mutex variable
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* @param self is a pointer to the mutex to be destroyed
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* @return self as given
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*/
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LumieraRecmutex
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lumiera_recmutex_destroy (LumieraRecmutex self, struct nobug_flag* flag);
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/**
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* Callback for unlocking mutexes.
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* @internal
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*/
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int
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lumiera_mutex_unlock_cb (void* mutex);
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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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