Raise the number of nested readers limit 2^16 and 2^32 on 32 and 64-bits arch.

[urcu.git] / urcu.h

diff --git a/urcu.h b/urcu.h
index 7c94a776119245086fc6a5ea84cd35684e0b2d8f..b8f6d9b29ab20a73b40b547261294c0f033c56e8 100644 (file)
--- a/urcu.h
+++ b/urcu.h
@@ -17,8 +17,8 @@
  * Distributed under GPLv2
  */
 
-#define __USE_GNU
 #include <stdlib.h>
+#include <pthread.h>
 
 /* The "volatile" is due to gcc bugs */
 #define barrier() __asm__ __volatile__("": : :"memory")
@@ -162,11 +162,12 @@ static inline void debug_yield_init(void)
 #endif
 
 /*
- * Limiting the nesting level to 256 to keep instructions small in the read
- * fast-path.
+ * The trick here is that RCU_GP_CTR_BIT 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           (1U << 0)
-#define RCU_GP_CTR_BIT         (1U << 8)
+/* Use the amount of bits equal to half of the architecture long size */
+#define RCU_GP_CTR_BIT         (sizeof(long) << 2)
 #define RCU_GP_CTR_NEST_MASK   (RCU_GP_CTR_BIT - 1)
 
 /*