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Add barriers
[urcu.git]
/
urcu.h
diff --git
a/urcu.h
b/urcu.h
index 1b663c7ff1492e3beeab7832a592e6c2b7d90925..3eca5ea3c44ccc7135635229c41141d5050df1e2 100644
(file)
--- a/
urcu.h
+++ b/
urcu.h
@@
-130,6
+130,13
@@
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
#define SIGURCU SIGUSR1
#define SIGURCU SIGUSR1
+/*
+ * If a reader is really non-cooperative and refuses to commit its
+ * urcu_active_readers count to memory (there is no barrier in the reader
+ * per-se), kick it after a few loops waiting for it.
+ */
+#define KICK_READER_LOOPS 10000
+
#ifdef DEBUG_YIELD
#include <sched.h>
#include <time.h>
#ifdef DEBUG_YIELD
#include <sched.h>
#include <time.h>
@@
-234,6
+241,8
@@
static inline void rcu_read_lock(void)
tmp = urcu_active_readers;
/* urcu_gp_ctr = RCU_GP_COUNT | (~RCU_GP_CTR_BIT or RCU_GP_CTR_BIT) */
tmp = urcu_active_readers;
/* urcu_gp_ctr = RCU_GP_COUNT | (~RCU_GP_CTR_BIT or RCU_GP_CTR_BIT) */
+ /* The data dependency "read urcu_gp_ctr, write urcu_active_readers",
+ * serializes those two memory operations. */
if (likely(!(tmp & RCU_GP_CTR_NEST_MASK)))
urcu_active_readers = urcu_gp_ctr;
else
if (likely(!(tmp & RCU_GP_CTR_NEST_MASK)))
urcu_active_readers = urcu_gp_ctr;
else
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