rculfqueue: LGPL-ize

[urcu.git] / urcu / compiler.h

diff --git a/urcu/compiler.h b/urcu/compiler.h
index 6f6d3e97eb3693ebdd7f8cc509b2acde5c709594..fb8b8293ca132f683f9639c3a2502e934d17c326 100644 (file)
--- a/urcu/compiler.h
+++ b/urcu/compiler.h
@@ -6,7 +6,7 @@
  *
  * Compiler definitions.
  *
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
@@ -18,10 +18,12 @@
  * modified is included with the above copyright notice.
  */
 
+#include <stddef.h>    /* for offsetof */
+
 #define likely(x)      __builtin_expect(!!(x), 1)
 #define unlikely(x)    __builtin_expect(!!(x), 0)
 
-#define        barrier()       asm volatile("" : : : "memory");
+#define        barrier()       asm volatile("" : : : "memory")
 
 /*
  * Instruct the compiler to perform only a single access to a variable
@@ -35,16 +37,28 @@
  * use is to mediate communication between process-level code and irq/NMI
  * handlers, all running on the same CPU.
  */
-#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&x)
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+
+#ifndef max
+#define max(a,b) ((a)>(b)?(a):(b))
+#endif
 
-#if (__GNUC__ == 4)
-#define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
+#ifndef min
+#define min(a,b) ((a)<(b)?(a):(b))
 #endif
 
-#ifdef __compiler_offsetof
-#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
+#if defined(__SIZEOF_LONG__)
+#define BITS_PER_LONG  (__SIZEOF_LONG__ * 8)
+#elif defined(_LP64)
+#define BITS_PER_LONG  64
 #else
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#define BITS_PER_LONG  32
 #endif
 
+#define container_of(ptr, type, member)                                        \
+       ({                                                              \
+               const typeof(((type *)NULL)->member) * __ptr = (ptr);   \
+               (type *)((char *)__ptr - offsetof(type, member));       \
+       })
+
 #endif /* _URCU_COMPILER_H */