X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu-reclaim-static.h;fp=urcu-reclaim-static.h;h=0000000000000000000000000000000000000000;hp=40de6fe46a4956805e0c424c1e2d671b2ad4c5e4;hb=786ee85b1676d2a1865b2db7120c45bafdf954d6;hpb=983e806feba6adf1dd07318fe97e6e8d2255a626

diff --git a/urcu-reclaim-static.h b/urcu-reclaim-static.h
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--- a/urcu-reclaim-static.h
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-#ifndef _URCU_RECLAIM_STATIC_H
-#define _URCU_RECLAIM_STATIC_H
-
-/*
- * urcu-reclaim-static.h
- *
- * Userspace RCU header - memory reclamation.
- *
- * TO BE INCLUDED ONLY IN LGPL-COMPATIBLE CODE. See urcu-reclaim.h for linking
- * dynamically with the userspace rcu reclamation library.
- *
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
- * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * IBM's contributions to this file may be relicensed under LGPLv2 or later.
- */
-
-#include <stdlib.h>
-#include <pthread.h>
-
-#include <compiler.h>
-#include <arch.h>
-
-
-/*
- * Number of entries in the per-thread reclaim queue. Must be power of 2.
- */
-#define RECLAIM_QUEUE_SIZE	(1 << 12)
-#define RECLAIM_QUEUE_MASK	(RECLAIM_QUEUE_SIZE - 1)
-
-/*
- * Identify a shared load. A smp_rmc() or smp_mc() should come before the load.
- */
-#define _LOAD_SHARED(p)	       ACCESS_ONCE(p)
-
-/*
- * Load a data from shared memory, doing a cache flush if required.
- */
-#define LOAD_SHARED(p)			\
-	({				\
-		smp_rmc();		\
-		_LOAD_SHARED(p);	\
-	})
-
-/*
- * Identify a shared store. A smp_wmc() or smp_mc() should follow the store.
- */
-#define _STORE_SHARED(x, v)	({ ACCESS_ONCE(x) = (v); })
-
-/*
- * Store v into x, where x is located in shared memory. Performs the required
- * cache flush after writing. Returns v.
- */
-#define STORE_SHARED(x, v)		\
-	({				\
-		_STORE_SHARED(x, v);	\
-		smp_wmc();		\
-		(v);			\
-	})
-
-/*
- * This code section can only be included in LGPL 2.1 compatible source code.
- * See below for the function call wrappers which can be used in code meant to
- * be only linked with the Userspace RCU library. This comes with a small
- * performance degradation on the read-side due to the added function calls.
- * This is required to permit relinking with newer versions of the library.
- */
-
-#ifdef DEBUG_RCU
-#define rcu_assert(args...)	assert(args)
-#else
-#define rcu_assert(args...)
-#endif
-
-struct reclaim_queue {
-	unsigned long head;	/* add element at head */
-	unsigned long tail;	/* next element to remove at tail */
-	void **q;
-};
-
-extern struct reclaim_queue __thread reclaim_queue;
-
-extern void rcu_reclaim_barrier_thread(void);
-
-/*
- * not signal-safe.
- */
-static inline void _rcu_reclaim_queue(void *p)
-{
-	unsigned long head, tail;
-
-	/*
-	 * Head is only modified by ourself. Tail can be modified by reclamation
-	 * thread.
-	 */
-	head = reclaim_queue.head;
-	tail = LOAD_SHARED(reclaim_queue.tail);
-
-	/*
-	 * If queue is full, empty it ourself.
-	 */
-	if (unlikely(head - tail >= RECLAIM_QUEUE_SIZE)) {
-		assert(head - tail == RECLAIM_QUEUE_SIZE);
-		rcu_reclaim_barrier_thread();
-		assert(head - LOAD_SHARED(reclaim_queue.tail) == 0);
-	}
-
-	smp_wmb();	/* Publish new pointer before write q[] */
-	_STORE_SHARED(reclaim_queue.q[head & RECLAIM_QUEUE_MASK], p);
-	smp_wmb();	/* Write q[] before head. */
-	STORE_SHARED(reclaim_queue.head, head + 1);
-}
-
-#endif /* _URCU_RECLAIM_STATIC_H */