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Diffstat (limited to 'libglusterfs/src/locking.h')
| -rw-r--r-- | libglusterfs/src/locking.h | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/libglusterfs/src/locking.h b/libglusterfs/src/locking.h deleted file mode 100644 index 43cc87735d1..00000000000 --- a/libglusterfs/src/locking.h +++ /dev/null @@ -1,84 +0,0 @@ -/* - Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com> - This file is part of GlusterFS. - - This file is licensed to you under your choice of the GNU Lesser - General Public License, version 3 or any later version (LGPLv3 or - later), or the GNU General Public License, version 2 (GPLv2), in all - cases as published by the Free Software Foundation. -*/ - -#ifndef _LOCKING_H -#define _LOCKING_H - -#include <pthread.h> - -#if defined(GF_DARWIN_HOST_OS) -#include <libkern/OSAtomic.h> -#define pthread_spinlock_t OSSpinLock -#define pthread_spin_lock(l) OSSpinLockLock(l) -#define pthread_spin_unlock(l) OSSpinLockUnlock(l) -#define pthread_spin_destroy(l) 0 -#define pthread_spin_init(l, v) (*l = v) -#endif - -#if defined(HAVE_SPINLOCK) - -typedef union { - pthread_spinlock_t spinlock; - pthread_mutex_t mutex; -} gf_lock_t; - -#if !defined(LOCKING_IMPL) -extern int use_spinlocks; - -/* - * Using a dispatch table would be unpleasant because we're dealing with two - * different types. If the dispatch contains direct pointers to pthread_xx - * or mutex_xxx then we have to hope that every possible union alternative - * starts at the same address as the union itself. I'm old enough to remember - * compilers where this was not the case (for alignment reasons) so I'm a bit - * paranoid about that. Also, I don't like casting arguments through "void *" - * which we'd also have to do to avoid type errors. The other alternative would - * be to define actual functions which pick out the right union member, and put - * those in the dispatch tables. Now we have a pointer dereference through the - * dispatch table plus a function call, which is likely to be worse than the - * branching here from the ?: construct. If it were a clear win it might be - * worth the extra complexity, but for now this way seems preferable. - */ - -#define LOCK_INIT(x) \ - (use_spinlocks ? pthread_spin_init(&((x)->spinlock), 0) \ - : pthread_mutex_init(&((x)->mutex), 0)) - -#define LOCK(x) \ - (use_spinlocks ? pthread_spin_lock(&((x)->spinlock)) \ - : pthread_mutex_lock(&((x)->mutex))) - -#define TRY_LOCK(x) \ - (use_spinlocks ? pthread_spin_trylock(&((x)->spinlock)) \ - : pthread_mutex_trylock(&((x)->mutex))) - -#define UNLOCK(x) \ - (use_spinlocks ? pthread_spin_unlock(&((x)->spinlock)) \ - : pthread_mutex_unlock(&((x)->mutex))) - -#define LOCK_DESTROY(x) \ - (use_spinlocks ? pthread_spin_destroy(&((x)->spinlock)) \ - : pthread_mutex_destroy(&((x)->mutex))) - -#endif - -#else - -typedef pthread_mutex_t gf_lock_t; - -#define LOCK_INIT(x) pthread_mutex_init(x, 0) -#define LOCK(x) pthread_mutex_lock(x) -#define TRY_LOCK(x) pthread_mutex_trylock(x) -#define UNLOCK(x) pthread_mutex_unlock(x) -#define LOCK_DESTROY(x) pthread_mutex_destroy(x) - -#endif /* HAVE_SPINLOCK */ - -#endif /* _LOCKING_H */ |