proc_test: do not overflow preempt_counter on AVR.

[bertos.git] / bertos / cfg / compiler.h

diff --git a/bertos/cfg/compiler.h b/bertos/cfg/compiler.h
index 7357f43f69789bdb380192795a18e5fc59121c6e..5cacf1dca66fe20041b8e2fa0aa5133b66aad3d0 100644 (file)
--- a/bertos/cfg/compiler.h
+++ b/bertos/cfg/compiler.h
@@ -490,6 +490,16 @@ typedef unsigned char page_t;    /**< Type for banked memory pages. */
         */
        #define countof(a)  (sizeof(a) / sizeof(*(a)))
 #endif
+#ifndef alignof
+       /**
+        * Return the alignment in memory of a generic data type.
+        *
+        * \note We need to worry about alignment when allocating memory that
+        * will be used later by unknown objects (e.g., malloc()) or, more
+        * generally, whenever creating generic container types.
+        */
+       #define alignof(type) offsetof(struct { char c; type member; }, member)
+#endif
 
 /**
  * Cast a member of a structure out to the containing structure.
@@ -500,12 +510,12 @@ typedef unsigned char page_t;    /**< Type for banked memory pages. */
  */
 #if COMPILER_TYPEOF && COMPILER_STATEMENT_EXPRESSIONS
        #define containerof(ptr, type, member) ({ \
-               const typeof( ((type *)0)->member ) *_mptr = (ptr); /* type check */ \
-               (type *)((char *)_mptr - offsetof(type, member)); \
+               typeof( ((type *)0)->member ) *_mptr = (ptr); /* type check */ \
+               (type *)(void *)((char *)_mptr - offsetof(type, member)); \
        })
 #else
        #define containerof(ptr, type, member) \
-               ( (type *)((char *)(ptr) - offsetof(type, member)) )
+               ( (type *)(void *)((char *)(ptr) - offsetof(type, member)) )
 #endif
 
 /** Issue a compilation error if the \a condition is false */