add a couple of macros for memory page alignment

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1742 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 25 insertions, 1 deletions

diff --git a/src/pulsecore/macro.h b/src/pulsecore/macro.h
index efd0f5ed..53e52fd0 100644
--- a/src/pulsecore/macro.h
+++ b/src/pulsecore/macro.h
@@ -25,15 +25,39 @@
 ***/
 
 #include <sys/types.h>
+#include <unistd.h>
 #include <assert.h>
+#include <limits.h>
+#include <unistd.h>  
+
 #include <pulsecore/log.h>
 
+#if defined(PAGE_SIZE)
+#define PA_PAGE_SIZE ((size_t) PAGE_SIZE)
+#elif defined(PAGESIZE)
+#define PA_PAGE_SIZE ((size_t) PAGESIZE)
+#elif defined(HAVE_SYSCONF)
+#define PA_PAGE_SIZE ((size_t) (sysconf(_SC_PAGE_SIZE)))
+#else
+/* Let's hope it's like x86. */
+#define PA_PAGE_SIZE ((size_t) 4096)
+#endif
+
 static inline size_t pa_align(size_t l) {
     return (((l + sizeof(void*) - 1) / sizeof(void*)) * sizeof(void*));
 }
-
 #define PA_ALIGN(x) (pa_align(x))
 
+static inline void* pa_page_align_ptr(const void *p) {
+    return (void*) (((size_t) p) & ~(PA_PAGE_SIZE-1));
+}
+#define PA_PAGE_ALIGN_PTR(x) (pa_page_align_ptr(x))
+
+static inline size_t pa_page_align(size_t l) {
+    return l & ~(PA_PAGE_SIZE-1);
+}
+#define PA_PAGE_ALIGN(x) (pa_page_align(x))
+
 #define PA_ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
 
 #define SA_MAX(a, b) ((a) > (b) ? (a) : (b))