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138 lines
4.6 KiB
138 lines
4.6 KiB
#ifndef __LINUX_RWLOCK_H |
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#define __LINUX_RWLOCK_H |
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#ifndef __LINUX_SPINLOCK_H |
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# error "please don't include this file directly" |
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#endif |
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/* |
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* rwlock related methods |
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* |
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* split out from spinlock.h |
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* |
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* portions Copyright 2005, Red Hat, Inc., Ingo Molnar |
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* Released under the General Public License (GPL). |
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*/ |
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#ifdef CONFIG_DEBUG_SPINLOCK |
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extern void __rwlock_init(rwlock_t *lock, const char *name, |
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struct lock_class_key *key); |
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# define rwlock_init(lock) \ |
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do { \ |
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static struct lock_class_key __key; \ |
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\ |
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__rwlock_init((lock), #lock, &__key); \ |
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} while (0) |
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#else |
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# define rwlock_init(lock) \ |
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do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0) |
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#endif |
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#ifdef CONFIG_DEBUG_SPINLOCK |
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extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock); |
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#define do_raw_read_lock_flags(lock, flags) do_raw_read_lock(lock) |
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extern int do_raw_read_trylock(rwlock_t *lock); |
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extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock); |
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extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock); |
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#define do_raw_write_lock_flags(lock, flags) do_raw_write_lock(lock) |
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extern int do_raw_write_trylock(rwlock_t *lock); |
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extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock); |
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#else |
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#ifndef arch_read_lock_flags |
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# define arch_read_lock_flags(lock, flags) arch_read_lock(lock) |
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#endif |
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#ifndef arch_write_lock_flags |
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# define arch_write_lock_flags(lock, flags) arch_write_lock(lock) |
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#endif |
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# define do_raw_read_lock(rwlock) do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0) |
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# define do_raw_read_lock_flags(lock, flags) \ |
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do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0) |
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# define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock) |
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# define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) |
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# define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0) |
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# define do_raw_write_lock_flags(lock, flags) \ |
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do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0) |
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# define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock) |
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# define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) |
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#endif |
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/* |
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* Define the various rw_lock methods. Note we define these |
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* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various |
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* methods are defined as nops in the case they are not required. |
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*/ |
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#define read_trylock(lock) __cond_lock(lock, _raw_read_trylock(lock)) |
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#define write_trylock(lock) __cond_lock(lock, _raw_write_trylock(lock)) |
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#define write_lock(lock) _raw_write_lock(lock) |
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#define read_lock(lock) _raw_read_lock(lock) |
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) |
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#define read_lock_irqsave(lock, flags) \ |
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do { \ |
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typecheck(unsigned long, flags); \ |
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flags = _raw_read_lock_irqsave(lock); \ |
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} while (0) |
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#define write_lock_irqsave(lock, flags) \ |
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do { \ |
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typecheck(unsigned long, flags); \ |
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flags = _raw_write_lock_irqsave(lock); \ |
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} while (0) |
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#else |
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#define read_lock_irqsave(lock, flags) \ |
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do { \ |
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typecheck(unsigned long, flags); \ |
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_raw_read_lock_irqsave(lock, flags); \ |
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} while (0) |
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#define write_lock_irqsave(lock, flags) \ |
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do { \ |
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typecheck(unsigned long, flags); \ |
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_raw_write_lock_irqsave(lock, flags); \ |
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} while (0) |
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#endif |
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#define read_lock_irq(lock) _raw_read_lock_irq(lock) |
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#define read_lock_bh(lock) _raw_read_lock_bh(lock) |
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#define write_lock_irq(lock) _raw_write_lock_irq(lock) |
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#define write_lock_bh(lock) _raw_write_lock_bh(lock) |
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#define read_unlock(lock) _raw_read_unlock(lock) |
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#define write_unlock(lock) _raw_write_unlock(lock) |
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#define read_unlock_irq(lock) _raw_read_unlock_irq(lock) |
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#define write_unlock_irq(lock) _raw_write_unlock_irq(lock) |
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#define read_unlock_irqrestore(lock, flags) \ |
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do { \ |
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typecheck(unsigned long, flags); \ |
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_raw_read_unlock_irqrestore(lock, flags); \ |
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} while (0) |
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#define read_unlock_bh(lock) _raw_read_unlock_bh(lock) |
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#define write_unlock_irqrestore(lock, flags) \ |
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do { \ |
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typecheck(unsigned long, flags); \ |
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_raw_write_unlock_irqrestore(lock, flags); \ |
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} while (0) |
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#define write_unlock_bh(lock) _raw_write_unlock_bh(lock) |
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#define write_trylock_irqsave(lock, flags) \ |
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({ \ |
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local_irq_save(flags); \ |
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write_trylock(lock) ? \ |
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1 : ({ local_irq_restore(flags); 0; }); \ |
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}) |
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#ifdef arch_rwlock_is_contended |
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#define rwlock_is_contended(lock) \ |
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arch_rwlock_is_contended(&(lock)->raw_lock) |
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#else |
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#define rwlock_is_contended(lock) ((void)(lock), 0) |
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#endif /* arch_rwlock_is_contended */ |
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#endif /* __LINUX_RWLOCK_H */
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