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urcu-bp.h
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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 <[email protected]>
* 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_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 void *rcu_dereference_sym_bp(void *p);
#define rcu_dereference_bp(p) \
({ \
__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) \
({ \
__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) \
({ \
__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) \
({ \
__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 */