Reorganise memory utilities

src/os/mem/posix/mem_os_posix.h

@@ -0,0 +1,33 @@
+#ifndef MEM_OS_POSIX_H
+#define MEM_OS_POSIX_H
+
+#include "platform.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // !__cplusplus
+
+#ifdef WAPP_PLATFORM_POSIX
+
+#include <sys/mman.h>
+
+typedef enum mem_alloc_flags {
+#if defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT  = MAP_POPULATE,
+#elif defined(WAPP_PLATFORM_FREE_BSD)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT  = MAP_PREFAULT_READ,
+#elif defined(WAPP_PLATFORM_BSD) || defined(WAPP_PLATFORM_UNIX) || defined(WAPP_PLATFORM_APPLE)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT  = 0,
+#endif
+} MemAllocFlags;
+
+#endif // !WAPP_PLATFORM_POSIX
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // !__cplusplus
+
+#endif // !MEM_OS_POSIX_H