diff options
Diffstat (limited to 'net/tipc/ref.h')
-rw-r--r-- | net/tipc/ref.h | 89 |
1 files changed, 4 insertions, 85 deletions
diff --git a/net/tipc/ref.h b/net/tipc/ref.h index 38f3a7f..7e3798e 100644 --- a/net/tipc/ref.h +++ b/net/tipc/ref.h @@ -2,7 +2,7 @@ * net/tipc/ref.h: Include file for TIPC object registry code * * Copyright (c) 1991-2006, Ericsson AB - * Copyright (c) 2005, Wind River Systems + * Copyright (c) 2005-2006, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -37,95 +37,14 @@ #ifndef _TIPC_REF_H #define _TIPC_REF_H -/** - * struct reference - TIPC object reference entry - * @object: pointer to object associated with reference entry - * @lock: spinlock controlling access to object - * @data: reference value associated with object (or link to next unused entry) - */ - -struct reference { - void *object; - spinlock_t lock; - union { - u32 next_plus_upper; - u32 reference; - } data; -}; - -/** - * struct tipc_ref_table - table of TIPC object reference entries - * @entries: pointer to array of reference entries - * @index_mask: bitmask for array index portion of reference values - * @first_free: array index of first unused object reference entry - * @last_free: array index of last unused object reference entry - */ - -struct ref_table { - struct reference *entries; - u32 index_mask; - u32 first_free; - u32 last_free; -}; - -extern struct ref_table tipc_ref_table; - int tipc_ref_table_init(u32 requested_size, u32 start); void tipc_ref_table_stop(void); u32 tipc_ref_acquire(void *object, spinlock_t **lock); void tipc_ref_discard(u32 ref); - -/** - * tipc_ref_lock - lock referenced object and return pointer to it - */ - -static inline void *tipc_ref_lock(u32 ref) -{ - if (likely(tipc_ref_table.entries)) { - struct reference *r = - &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; - - spin_lock_bh(&r->lock); - if (likely(r->data.reference == ref)) - return r->object; - spin_unlock_bh(&r->lock); - } - return NULL; -} - -/** - * tipc_ref_unlock - unlock referenced object - */ - -static inline void tipc_ref_unlock(u32 ref) -{ - if (likely(tipc_ref_table.entries)) { - struct reference *r = - &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; - - if (likely(r->data.reference == ref)) - spin_unlock_bh(&r->lock); - else - err("tipc_ref_unlock() invoked using obsolete reference\n"); - } -} - -/** - * tipc_ref_deref - return pointer referenced object (without locking it) - */ - -static inline void *tipc_ref_deref(u32 ref) -{ - if (likely(tipc_ref_table.entries)) { - struct reference *r = - &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; - - if (likely(r->data.reference == ref)) - return r->object; - } - return NULL; -} +void *tipc_ref_lock(u32 ref); +void tipc_ref_unlock(u32 ref); +void *tipc_ref_deref(u32 ref); #endif |