+++ /dev/null
-#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 */
projects / urcu.git / blobdiff