* IBM's contributions to this file may be relicensed under LGPLv2 or later.
*/
-#include <stdlib.h>
-#include <pthread.h>
-#include <unistd.h>
-#include <stdint.h>
-
-#include <urcu/config.h>
-#include <urcu/compiler.h>
-#include <urcu/arch.h>
-#include <urcu/system.h>
-#include <urcu/uatomic.h>
-#include <urcu/list.h>
-#include <urcu/futex.h>
-#include <urcu/tls-compat.h>
-#include <urcu/debug.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
/* Default is RCU_MEMBARRIER */
#if !defined(RCU_MEMBARRIER) && !defined(RCU_MB) && !defined(RCU_SIGNAL)
#define RCU_MEMBARRIER
#endif
-/*
- * This code section can only be included in LGPL 2.1 compatible source code.
- * See below for the function call wrappers which can be used in code meant to
- * be only linked with the Userspace RCU library. This comes with a small
- * performance degradation on the read-side due to the added function calls.
- * This is required to permit relinking with newer versions of the library.
- */
-
-/*
- * The signal number used by the RCU library can be overridden with
- * -DSIGRCU= when compiling the library.
- * Provide backward compatibility for liburcu 0.3.x SIGURCU.
- */
-#ifdef SIGURCU
-#define SIGRCU SIGURCU
-#endif
-
-#ifndef SIGRCU
-#define SIGRCU SIGUSR1
-#endif
-
-enum rcu_state {
- RCU_READER_ACTIVE_CURRENT,
- RCU_READER_ACTIVE_OLD,
- RCU_READER_INACTIVE,
-};
-
-/*
- * Slave barriers are only guaranteed to be ordered wrt master barriers.
- *
- * The pair ordering is detailed as (O: ordered, X: not ordered) :
- * slave master
- * slave X O
- * master O O
- */
-
#ifdef RCU_MEMBARRIER
-#ifdef CONFIG_RCU_FORCE_SYS_MEMBARRIER
-#define rcu_has_sys_membarrier_memb 1
-#else
-extern int rcu_has_sys_membarrier_memb;
-#endif
-
-static inline void smp_mb_slave(void)
-{
- if (caa_likely(rcu_has_sys_membarrier_memb))
- cmm_barrier();
- else
- cmm_smp_mb();
-}
+#include <urcu/static/urcu-memb.h>
#endif
#ifdef RCU_MB
-static inline void smp_mb_slave(void)
-{
- cmm_smp_mb();
-}
+#include <urcu/static/urcu-mb.h>
#endif
#ifdef RCU_SIGNAL
-static inline void smp_mb_slave(void)
-{
- cmm_barrier();
-}
-#endif
-
-/*
- * The trick here is that RCU_GP_CTR_PHASE must be a multiple of 8 so we can use
- * a full 8-bits, 16-bits or 32-bits bitmask for the lower order bits.
- */
-#define RCU_GP_COUNT (1UL << 0)
-/* Use the amount of bits equal to half of the architecture long size */
-#define RCU_GP_CTR_PHASE (1UL << (sizeof(unsigned long) << 2))
-#define RCU_GP_CTR_NEST_MASK (RCU_GP_CTR_PHASE - 1)
-
-struct rcu_gp {
- /*
- * Global grace period counter.
- * Contains the current RCU_GP_CTR_PHASE.
- * Also has a RCU_GP_COUNT of 1, to accelerate the reader fast path.
- * Written to only by writer with mutex taken.
- * Read by both writer and readers.
- */
- unsigned long ctr;
-
- int32_t futex;
-} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
-
-extern struct rcu_gp rcu_gp;
-
-struct rcu_reader {
- /* Data used by both reader and synchronize_rcu() */
- unsigned long ctr;
- char need_mb;
- /* Data used for registry */
- struct cds_list_head node __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
- pthread_t tid;
- /* Reader registered flag, for internal checks. */
- unsigned int registered:1;
-};
-
-extern DECLARE_URCU_TLS(struct rcu_reader, rcu_reader);
-
-/*
- * Wake-up waiting synchronize_rcu(). Called from many concurrent threads.
- */
-static inline void wake_up_gp(void)
-{
- if (caa_unlikely(uatomic_read(&rcu_gp.futex) == -1)) {
- uatomic_set(&rcu_gp.futex, 0);
- /*
- * Ignoring return value until we can make this function
- * return something (because urcu_die() is not publicly
- * exposed).
- */
- (void) futex_async(&rcu_gp.futex, FUTEX_WAKE, 1,
- NULL, NULL, 0);
- }
-}
-
-static inline enum rcu_state rcu_reader_state(unsigned long *ctr)
-{
- unsigned long v;
-
- /*
- * Make sure both tests below are done on the same version of *value
- * to insure consistency.
- */
- v = CMM_LOAD_SHARED(*ctr);
- if (!(v & RCU_GP_CTR_NEST_MASK))
- return RCU_READER_INACTIVE;
- if (!((v ^ rcu_gp.ctr) & RCU_GP_CTR_PHASE))
- return RCU_READER_ACTIVE_CURRENT;
- return RCU_READER_ACTIVE_OLD;
-}
-
-/*
- * Helper for _rcu_read_lock(). The format of rcu_gp.ctr (as well as
- * the per-thread rcu_reader.ctr) has the upper bits containing a count of
- * _rcu_read_lock() nesting, and a lower-order bit that contains either zero
- * or RCU_GP_CTR_PHASE. The smp_mb_slave() ensures that the accesses in
- * _rcu_read_lock() happen before the subsequent read-side critical section.
- */
-static inline void _rcu_read_lock_update(unsigned long tmp)
-{
- if (caa_likely(!(tmp & RCU_GP_CTR_NEST_MASK))) {
- _CMM_STORE_SHARED(URCU_TLS(rcu_reader).ctr, _CMM_LOAD_SHARED(rcu_gp.ctr));
- smp_mb_slave();
- } else
- _CMM_STORE_SHARED(URCU_TLS(rcu_reader).ctr, tmp + RCU_GP_COUNT);
-}
-
-/*
- * Enter an RCU read-side critical section.
- *
- * The first cmm_barrier() call ensures that the compiler does not reorder
- * the body of _rcu_read_lock() with a mutex.
- *
- * This function and its helper are both less than 10 lines long. The
- * intent is that this function meets the 10-line criterion in LGPL,
- * allowing this function to be invoked directly from non-LGPL code.
- */
-static inline void _rcu_read_lock(void)
-{
- unsigned long tmp;
-
- urcu_assert(URCU_TLS(rcu_reader).registered);
- cmm_barrier();
- tmp = URCU_TLS(rcu_reader).ctr;
- urcu_assert((tmp & RCU_GP_CTR_NEST_MASK) != RCU_GP_CTR_NEST_MASK);
- _rcu_read_lock_update(tmp);
-}
-
-/*
- * This is a helper function for _rcu_read_unlock().
- *
- * The first smp_mb_slave() call ensures that the critical section is
- * seen to precede the store to rcu_reader.ctr.
- * The second smp_mb_slave() call ensures that we write to rcu_reader.ctr
- * before reading the update-side futex.
- */
-static inline void _rcu_read_unlock_update_and_wakeup(unsigned long tmp)
-{
- if (caa_likely((tmp & RCU_GP_CTR_NEST_MASK) == RCU_GP_COUNT)) {
- smp_mb_slave();
- _CMM_STORE_SHARED(URCU_TLS(rcu_reader).ctr, tmp - RCU_GP_COUNT);
- smp_mb_slave();
- wake_up_gp();
- } else
- _CMM_STORE_SHARED(URCU_TLS(rcu_reader).ctr, tmp - RCU_GP_COUNT);
-}
-
-/*
- * Exit an RCU read-side crtical section. Both this function and its
- * helper are smaller than 10 lines of code, and are intended to be
- * usable by non-LGPL code, as called out in LGPL.
- */
-static inline void _rcu_read_unlock(void)
-{
- unsigned long tmp;
-
- urcu_assert(URCU_TLS(rcu_reader).registered);
- tmp = URCU_TLS(rcu_reader).ctr;
- urcu_assert(tmp & RCU_GP_CTR_NEST_MASK);
- _rcu_read_unlock_update_and_wakeup(tmp);
- cmm_barrier(); /* Ensure the compiler does not reorder us with mutex */
-}
-
-/*
- * Returns whether within a RCU read-side critical section.
- *
- * This function is less than 10 lines long. The intent is that this
- * function meets the 10-line criterion for LGPL, allowing this function
- * to be invoked directly from non-LGPL code.
- */
-static inline int _rcu_read_ongoing(void)
-{
- return URCU_TLS(rcu_reader).ctr & RCU_GP_CTR_NEST_MASK;
-}
-
-#ifdef __cplusplus
-}
+#include <urcu/static/urcu-signal.h>
#endif
#endif /* _URCU_STATIC_H */
projects / urcu.git / blobdiff