X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=include%2Furcu%2Furcu-bp.h;fp=include%2Furcu%2Furcu-bp.h;h=7b00aaa8d555130f2b2dcf733344571931624c24;hp=0000000000000000000000000000000000000000;hb=4477a87021ffbfbfdb2a2084d05a084171343d36;hpb=5bbe95bb510534d0a5bab8d7d205b32d6e4a57b2 diff --git a/include/urcu/urcu-bp.h b/include/urcu/urcu-bp.h new file mode 100644 index 0000000..7b00aaa --- /dev/null +++ b/include/urcu/urcu-bp.h @@ -0,0 +1,195 @@ +#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 + * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. + * + * LGPL-compatible code should include this header with : + * + * #define _LGPL_SOURCE + * #include + * + * 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 +#include + +#ifdef __cplusplus +extern "C" { +#endif + +#include + +/* + * 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 + +#ifdef _LGPL_SOURCE + +#include + +/* + * 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 urcu_bp_read_lock _urcu_bp_read_lock +#define urcu_bp_read_unlock _urcu_bp_read_unlock +#define urcu_bp_read_ongoing _urcu_bp_read_ongoing + +#define urcu_bp_dereference rcu_dereference +#define urcu_bp_cmpxchg_pointer rcu_cmpxchg_pointer +#define urcu_bp_xchg_pointer rcu_xchg_pointer +#define urcu_bp_set_pointer 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 urcu_bp_read_lock(void); +extern void urcu_bp_read_unlock(void); +extern int urcu_bp_read_ongoing(void); + +extern void *urcu_bp_dereference_sym(void *p); +#define urcu_bp_dereference(p) \ + __extension__ \ + ({ \ + __typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p), \ + urcu_bp_dereference_sym(URCU_FORCE_CAST(void *, p))); \ + (_________p1); \ + }) + +extern void *urcu_bp_cmpxchg_pointer_sym(void **p, void *old, void *_new); +#define urcu_bp_cmpxchg_pointer(p, old, _new) \ + __extension__ \ + ({ \ + __typeof__(*(p)) _________pold = (old); \ + __typeof__(*(p)) _________pnew = (_new); \ + __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \ + urcu_bp_cmpxchg_pointer_sym(URCU_FORCE_CAST(void **, p), \ + _________pold, \ + _________pnew)); \ + (_________p1); \ + }) + +extern void *urcu_bp_xchg_pointer_sym(void **p, void *v); +#define urcu_bp_xchg_pointer(p, v) \ + __extension__ \ + ({ \ + __typeof__(*(p)) _________pv = (v); \ + __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)),\ + urcu_bp_xchg_pointer_sym(URCU_FORCE_CAST(void **, p), \ + _________pv)); \ + (_________p1); \ + }) + +extern void *urcu_bp_set_pointer_sym(void **p, void *v); +#define urcu_bp_set_pointer(p, v) \ + __extension__ \ + ({ \ + __typeof__(*(p)) _________pv = (v); \ + __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \ + urcu_bp_set_pointer_sym(URCU_FORCE_CAST(void **, p), \ + _________pv)); \ + (_________p1); \ + }) + +#endif /* !_LGPL_SOURCE */ + +extern void urcu_bp_synchronize_rcu(void); + +/* + * urcu_bp_before_fork, urcu_bp_after_fork_parent and urcu_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 urcu_bp_before_fork(void); +extern void urcu_bp_after_fork_parent(void); +extern void urcu_bp_after_fork_child(void); + +/* + * In the bulletproof version, the following functions are no-ops. + */ +static inline void urcu_bp_register_thread(void) +{ +} + +static inline void urcu_bp_unregister_thread(void) +{ +} + +static inline void urcu_bp_init(void) +{ +} + +/* + * Q.S. reporting are no-ops for these URCU flavors. + */ +static inline void urcu_bp_quiescent_state(void) +{ +} + +static inline void urcu_bp_thread_offline(void) +{ +} + +static inline void urcu_bp_thread_online(void) +{ +} + +#ifdef __cplusplus +} +#endif + +#include +#include +#include + +#ifndef URCU_API_MAP +#include +#endif + +#endif /* _URCU_BP_H */