X-Git-Url: http://git.liburcu.org/?p=userspace-rcu.git;a=blobdiff_plain;f=src%2Furcu-bp.h;fp=src%2Furcu-bp.h;h=7a265dc5f91b1899ef35a73d31eb7782d4d2e5a3;hp=0000000000000000000000000000000000000000;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332

diff --git a/src/urcu-bp.h b/src/urcu-bp.h
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+++ b/src/urcu-bp.h
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+#ifndef _URCU_BP_H
+#define _URCU_BP_H
+
+/*
+ * urcu-bp.h
+ *
+ * Userspace RCU header, "bulletproof" version.
+ *
+ * Slower RCU read-side adapted for tracing library. Does not require thread
+ * registration nor unregistration. Also signal-safe.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ *
+ * LGPL-compatible code should include this header with :
+ *
+ * #define _LGPL_SOURCE
+ * #include <urcu.h>
+ *
+ * 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>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <urcu/map/urcu-bp.h>
+
+/*
+ * Important !
+ *
+ * Each thread containing read-side critical sections must be registered
+ * with rcu_register_thread() before calling rcu_read_lock().
+ * rcu_unregister_thread() should be called before the thread exits.
+ */
+
+/*
+ * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer
+ * publication headers.
+ */
+#include <urcu-pointer.h>
+
+#ifdef _LGPL_SOURCE
+
+#include <urcu/static/urcu-bp.h>
+
+/*
+ * Mappings for static use of the userspace RCU library.
+ * Should only be used in LGPL-compatible code.
+ */
+
+/*
+ * rcu_read_lock()
+ * rcu_read_unlock()
+ *
+ * Mark the beginning and end of a read-side critical section.
+ */
+#define rcu_read_lock_bp		_rcu_read_lock
+#define rcu_read_unlock_bp		_rcu_read_unlock
+#define rcu_read_ongoing_bp		_rcu_read_ongoing
+
+#define rcu_dereference_bp		rcu_dereference
+#define rcu_cmpxchg_pointer_bp		rcu_cmpxchg_pointer
+#define rcu_xchg_pointer_bp		rcu_xchg_pointer
+#define rcu_set_pointer_bp		rcu_set_pointer
+
+#else /* !_LGPL_SOURCE */
+
+/*
+ * library wrappers to be used by non-LGPL compatible source code.
+ * See LGPL-only urcu/static/urcu-pointer.h for documentation.
+ */
+
+extern void rcu_read_lock(void);
+extern void rcu_read_unlock(void);
+extern int rcu_read_ongoing(void);
+
+extern void *rcu_dereference_sym_bp(void *p);
+#define rcu_dereference_bp(p)						     \
+	__extension__							     \
+	({								     \
+		__typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p),   \
+			rcu_dereference_sym_bp(URCU_FORCE_CAST(void *, p))); \
+		(_________p1);						     \
+	})
+
+extern void *rcu_cmpxchg_pointer_sym_bp(void **p, void *old, void *_new);
+#define rcu_cmpxchg_pointer_bp(p, old, _new)				     \
+	__extension__							     \
+	({								     \
+		__typeof__(*(p)) _________pold = (old);			     \
+		__typeof__(*(p)) _________pnew = (_new);		     \
+		__typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
+			rcu_cmpxchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
+						_________pold,		     \
+						_________pnew));	     \
+		(_________p1);						     \
+	})
+
+extern void *rcu_xchg_pointer_sym_bp(void **p, void *v);
+#define rcu_xchg_pointer_bp(p, v)					     \
+	__extension__							     \
+	({								     \
+		__typeof__(*(p)) _________pv = (v);			     \
+		__typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)),\
+			rcu_xchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
+					     _________pv));		     \
+		(_________p1);						     \
+	})
+
+extern void *rcu_set_pointer_sym_bp(void **p, void *v);
+#define rcu_set_pointer_bp(p, v)					     \
+	__extension__							     \
+	({								     \
+		__typeof__(*(p)) _________pv = (v);			     \
+		__typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
+			rcu_set_pointer_sym_bp(URCU_FORCE_CAST(void **, p),  \
+					    _________pv));		     \
+		(_________p1);						     \
+	})
+
+#endif /* !_LGPL_SOURCE */
+
+extern void synchronize_rcu(void);
+
+/*
+ * rcu_bp_before_fork, rcu_bp_after_fork_parent and rcu_bp_after_fork_child
+ * should be called around fork() system calls when the child process is not
+ * expected to immediately perform an exec(). For pthread users, see
+ * pthread_atfork(3).
+ */
+extern void rcu_bp_before_fork(void);
+extern void rcu_bp_after_fork_parent(void);
+extern void rcu_bp_after_fork_child(void);
+
+/*
+ * In the bulletproof version, the following functions are no-ops.
+ */
+static inline void rcu_register_thread(void)
+{
+}
+
+static inline void rcu_unregister_thread(void)
+{
+}
+
+static inline void rcu_init(void)
+{
+}
+
+/*
+ * Q.S. reporting are no-ops for these URCU flavors.
+ */
+static inline void rcu_quiescent_state(void)
+{
+}
+
+static inline void rcu_thread_offline(void)
+{
+}
+
+static inline void rcu_thread_online(void)
+{
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu-call-rcu.h>
+#include <urcu-defer.h>
+#include <urcu-flavor.h>
+
+#endif /* _URCU_BP_H */