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Add comment in rcu_add_lock
[urcu.git]
/
urcu.h
diff --git
a/urcu.h
b/urcu.h
index 7c94a776119245086fc6a5ea84cd35684e0b2d8f..277b7d2f45ae565610e4db9ee89457174fafa667 100644
(file)
--- a/
urcu.h
+++ b/
urcu.h
@@
-17,8
+17,8
@@
* Distributed under GPLv2
*/
* Distributed under GPLv2
*/
-#define __USE_GNU
#include <stdlib.h>
#include <stdlib.h>
+#include <pthread.h>
/* The "volatile" is due to gcc bugs */
#define barrier() __asm__ __volatile__("": : :"memory")
/* The "volatile" is due to gcc bugs */
#define barrier() __asm__ __volatile__("": : :"memory")
@@
-162,11
+162,12
@@
static inline void debug_yield_init(void)
#endif
/*
#endif
/*
- *
Limiting the nesting level to 256 to keep instructions small in the read
- * f
ast-path
.
+ *
The trick here is that RCU_GP_CTR_BIT must be a multiple of 8 so we can use a
+ * f
ull 8-bits, 16-bits or 32-bits bitmask for the lower order bits
.
*/
*/
-#define RCU_GP_COUNT (1U << 0)
-#define RCU_GP_CTR_BIT (1U << 8)
+#define RCU_GP_COUNT (1UL << 0)
+/* Use the amount of bits equal to half of the architecture long size */
+#define RCU_GP_CTR_BIT (1UL << (sizeof(long) << 2))
#define RCU_GP_CTR_NEST_MASK (RCU_GP_CTR_BIT - 1)
/*
#define RCU_GP_CTR_NEST_MASK (RCU_GP_CTR_BIT - 1)
/*
@@
-174,13
+175,13
@@
static inline void debug_yield_init(void)
* Using a int rather than a char to eliminate false register dependencies
* causing stalls on some architectures.
*/
* Using a int rather than a char to eliminate false register dependencies
* causing stalls on some architectures.
*/
-extern
int
urcu_gp_ctr;
+extern
long
urcu_gp_ctr;
-extern
int
__thread urcu_active_readers;
+extern
long
__thread urcu_active_readers;
-static inline int rcu_old_gp_ongoing(
int
*value)
+static inline int rcu_old_gp_ongoing(
long
*value)
{
{
-
int
v;
+
long
v;
if (value == NULL)
return 0;
if (value == NULL)
return 0;
@@
-193,13
+194,14
@@
static inline int rcu_old_gp_ongoing(int *value)
static inline void rcu_read_lock(void)
{
static inline void rcu_read_lock(void)
{
-
int
tmp;
+
long
tmp;
debug_yield_read();
tmp = urcu_active_readers;
debug_yield_read();
debug_yield_read();
tmp = urcu_active_readers;
debug_yield_read();
+ /* urcu_gp_ctr = RCU_GP_COUNT | (~RCU_GP_CTR_BIT or RCU_GP_CTR_BIT) */
if (likely(!(tmp & RCU_GP_CTR_NEST_MASK)))
if (likely(!(tmp & RCU_GP_CTR_NEST_MASK)))
- urcu_active_readers = urcu_gp_ctr
+ RCU_GP_COUNT
;
+ urcu_active_readers = urcu_gp_ctr;
else
urcu_active_readers = tmp + RCU_GP_COUNT;
debug_yield_read();
else
urcu_active_readers = tmp + RCU_GP_COUNT;
debug_yield_read();
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