eina: detect page size in a portable way.

2 files changed, 42 insertions, 0 deletions

diff --git a/src/lib/eina/eina_cpu.c b/src/lib/eina/eina_cpu.c
index 670b21c5d0..82c0f047d4 100644
--- a/src/lib/eina/eina_cpu.c
+++ b/src/lib/eina/eina_cpu.c
@@ -46,13 +46,17 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <unistd.h>
 
+#include "eina_log.h"
 #include "eina_cpu.h"
 
 /*============================================================================*
 *                                  Local                                     *
 *============================================================================*/
 
+static void _eina_page_size(void);
+
 /* FIXME this ifdefs should be replaced */
 #if defined(__i386__) || defined(__x86_64__)
 /* We save ebx and restore it to be PIC compatible */
@@ -140,6 +144,9 @@ eina_cpu_init(void)
 #endif
    // FIXME: Handle NEON and friends
 
+   // Figure out the page size for this system
+   _eina_page_size();
+
    return EINA_TRUE;
 }
 
@@ -237,6 +244,40 @@ _eina_cpu_count_internal(void)
 #endif
 }
 
+static int _page_size = 0;
+
+static void
+_eina_page_size(void)
+{
+#ifdef _WIN32
+   SYSTEM_INFO si;
+
+   GetSystemInfo(&si);
+
+   _page_size = (int)si.dwPageSize;
+#elif defined _SC_PAGESIZE
+   _page_size = (int)sysconf(_SC_PAGESIZE);
+#elif defined _SC_PAGE_SIZE
+   _page_size = (int)sysconf(_SC_PAGE_SIZE);
+#elif defined HAVE_GETPAGESIZE
+   _page_size = getpagesize();
+#else
+# warn "Falling back to a safe default page size (4K) !"
+   _page_size = 4096;
+#endif
+   if (_page_size < 1)
+     {
+        EINA_LOG_ERR("system reported weird value for PAGESIZE, assuming 4096.");
+        _page_size = 4096;
+     }
+}
+
+EAPI int eina_cpu_page_size(void)
+{
+   if (_page_size == 0) _eina_page_size();
+   return _page_size;
+}
+
 EAPI int eina_cpu_count(void)
 {
    return _cpu_count;
diff --git a/src/lib/eina/eina_cpu.h b/src/lib/eina/eina_cpu.h
index 651d925653..e31ed76735 100644
--- a/src/lib/eina/eina_cpu.h
+++ b/src/lib/eina/eina_cpu.h
@@ -40,6 +40,7 @@ EAPI extern Eina_Cpu_Features eina_cpu_features;
 
 EAPI Eina_Cpu_Features eina_cpu_features_get(void);
 EAPI int               eina_cpu_count(void);
+EAPI int               eina_cpu_page_size(void);
 
 static inline unsigned short eina_swap16(unsigned short x);
 static inline unsigned int eina_swap32(unsigned int x);