X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu-qsbr-static.h;h=d4cb6a98d5acfa5c760e3725b94e7f9437d075c1;hp=d53a1f4919569e5ada46b6fd3ff83bc8bded341f;hb=7e30abe3df0e83eeb741bfc18d07cb016af804a1;hpb=074d8438a30f7da8ae12eb94caff69c37fb576bd diff --git a/urcu-qsbr-static.h b/urcu-qsbr-static.h index d53a1f4..d4cb6a9 100644 --- a/urcu-qsbr-static.h +++ b/urcu-qsbr-static.h @@ -38,59 +38,10 @@ #include #include +#include #include #include -/* - * 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); \ - }) - -/** - * _rcu_dereference - reads (copy) a RCU-protected pointer to a local variable - * into a RCU read-side critical section. The pointer can later be safely - * dereferenced within the critical section. - * - * This ensures that the pointer copy is invariant thorough the whole critical - * section. - * - * Inserts memory barriers on architectures that require them (currently only - * Alpha) and documents which pointers are protected by RCU. - * - * Should match rcu_assign_pointer() or rcu_xchg_pointer(). - */ - -#define _rcu_dereference(p) ({ \ - typeof(p) _________p1 = LOAD_SHARED(p); \ - smp_read_barrier_depends(); \ - (_________p1); \ - }) - #define futex(...) syscall(__NR_futex, __VA_ARGS__) #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 @@ -262,67 +213,4 @@ static inline void _rcu_thread_online(void) smp_mb(); } -/** - * _rcu_assign_pointer - assign (publicize) a pointer to a new data structure - * meant to be read by RCU read-side critical sections. Returns the assigned - * value. - * - * Documents which pointers will be dereferenced by RCU read-side critical - * sections and adds the required memory barriers on architectures requiring - * them. It also makes sure the compiler does not reorder code initializing the - * data structure before its publication. - * - * Should match rcu_dereference_pointer(). - */ - -#define _rcu_assign_pointer(p, v) \ - ({ \ - if (!__builtin_constant_p(v) || \ - ((v) != NULL)) \ - wmb(); \ - STORE_SHARED(p, v); \ - }) - -/** - * _rcu_cmpxchg_pointer - same as rcu_assign_pointer, but tests if the pointer - * is as expected by "old". If succeeds, returns the previous pointer to the - * data structure, which can be safely freed after waiting for a quiescent state - * using synchronize_rcu(). If fails (unexpected value), returns old (which - * should not be freed !). - */ - -#define _rcu_cmpxchg_pointer(p, old, _new) \ - ({ \ - if (!__builtin_constant_p(_new) || \ - ((_new) != NULL)) \ - wmb(); \ - uatomic_cmpxchg(p, old, _new); \ - }) - -/** - * _rcu_xchg_pointer - same as rcu_assign_pointer, but returns the previous - * pointer to the data structure, which can be safely freed after waiting for a - * quiescent state using synchronize_rcu(). - */ - -#define _rcu_xchg_pointer(p, v) \ - ({ \ - if (!__builtin_constant_p(v) || \ - ((v) != NULL)) \ - wmb(); \ - uatomic_xchg(p, v); \ - }) - -/* - * Exchanges the pointer and waits for quiescent state. - * The pointer returned can be freed. - */ -#define _rcu_publish_content(p, v) \ - ({ \ - void *oldptr; \ - oldptr = _rcu_xchg_pointer(p, v); \ - synchronize_rcu(); \ - oldptr; \ - }) - #endif /* _URCU_QSBR_STATIC_H */