X-Git-Url: http://git.liburcu.org/?p=userspace-rcu.git;a=blobdiff_plain;f=src%2Furcu-qsbr.h;fp=src%2Furcu-qsbr.h;h=bf173618bf9a0dee1da8441ff2c14ada233fa064;hp=0000000000000000000000000000000000000000;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332

diff --git a/src/urcu-qsbr.h b/src/urcu-qsbr.h
new file mode 100644
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--- /dev/null
+++ b/src/urcu-qsbr.h
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+#ifndef _URCU_QSBR_H
+#define _URCU_QSBR_H
+
+/*
+ * urcu-qsbr.h
+ *
+ * Userspace RCU QSBR header.
+ *
+ * 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>
+
+/*
+ * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer
+ * publication headers.
+ */
+#include <urcu-pointer.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <urcu/map/urcu-qsbr.h>
+
+#ifdef RCU_DEBUG	/* For backward compatibility */
+#define DEBUG_RCU
+#endif
+
+/*
+ * 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.
+ */
+
+#ifdef _LGPL_SOURCE
+
+#include <urcu/static/urcu-qsbr.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.
+ * DON'T FORGET TO USE rcu_register_thread/rcu_unregister_thread()
+ * FOR EACH THREAD WITH READ-SIDE CRITICAL SECTION.
+ */
+#define rcu_read_lock_qsbr		_rcu_read_lock
+#define rcu_read_unlock_qsbr		_rcu_read_unlock
+#define rcu_read_ongoing_qsbr		_rcu_read_ongoing
+
+#define rcu_quiescent_state_qsbr	_rcu_quiescent_state
+#define rcu_thread_offline_qsbr		_rcu_thread_offline
+#define rcu_thread_online_qsbr		_rcu_thread_online
+
+#else /* !_LGPL_SOURCE */
+
+/*
+ * library wrappers to be used by non-LGPL compatible source code.
+ */
+
+/*
+ * QSBR read lock/unlock are guaranteed to be no-ops. Therefore, we expose them
+ * in the LGPL header for any code to use. However, the debug version is not
+ * nops and may contain sanity checks. To activate it, applications must be
+ * recompiled with -DDEBUG_RCU (even non-LGPL/GPL applications). This is the
+ * best trade-off between license/performance/code triviality and
+ * library debugging & tracing features we could come up with.
+ */
+
+#if (!defined(BUILD_QSBR_LIB) && !defined(DEBUG_RCU))
+
+static inline void rcu_read_lock(void)
+{
+}
+
+static inline void rcu_read_unlock(void)
+{
+}
+
+#else /* !DEBUG_RCU */
+
+extern void rcu_read_lock(void);
+extern void rcu_read_unlock(void);
+
+#endif /* !DEBUG_RCU */
+
+extern int rcu_read_ongoing(void);
+extern void rcu_quiescent_state(void);
+extern void rcu_thread_offline(void);
+extern void rcu_thread_online(void);
+
+#endif /* !_LGPL_SOURCE */
+
+extern void synchronize_rcu(void);
+
+/*
+ * Reader thread registration.
+ */
+extern void rcu_register_thread(void);
+extern void rcu_unregister_thread(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu-call-rcu.h>
+#include <urcu-defer.h>
+#include <urcu-flavor.h>
+
+#endif /* _URCU_QSBR_H */