New file.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@1573 72102866-910b-0410-8b05-ffd578937521
2025-04-22 16:33:29 +00:00 · 1996-05-28 20:53:06 +00:00 · 1996-05-28 20:53:06 +00:00 · b84f4e6bfa
commit b84f4e6bfa
parent e9ffc72f54
1 changed files with 127 additions and 0 deletions
--- a/Source/NSPage.m
+++ b/Source/NSPage.m
@ -0,0 +1,127 @@
+/* Implementation of page-related functions for OpenStep
+   Copyright (C) 1996 Free Software Foundation, Inc.
+   
+   Written by:  Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
+   Created: May 1996
+   
+   This file is part of the GNUstep Base Library.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   */ 
+
+#include <gnustep/base/preface.h>
+#include <unistd.h>
+#include <stdio.h>
+#if __mach__
+#include <mach.h>
+#endif
+
+/* Cache the size of a memory page here, so we don't have to make the
+   getpagesize() system call repeatedly. */
+static unsigned ns_page_size = 0;
+
+/* Return the number of bytes in a memory page. */
+unsigned
+NSPageSize (void)
+{
+  if (!ns_page_size)
+#if __mach__
+    ns_page_size = (unsigned) vm_page_size ();
+#else
+    ns_page_size = (unsigned) getpagesize ();
+#endif
+  return ns_page_size;
+}
+
+/* Return log base 2 of the number of bytes in a memory page. */
+unsigned
+NSLogPageSize (void)
+{
+  unsigned tmp_page_size;
+  unsigned log = 1;
+
+  if (!ns_page_size)
+    ns_page_size = (unsigned) getpagesize ();
+  tmp_page_size = ns_page_size;
+  while (tmp_page_size >> 1)
+    log++;
+  return log;
+}
+
+/* Round BYTES down to the nearest multiple of the memory page size,
+   and return it. */
+unsigned
+NSRoundDownToMultipleOfPageSize (unsigned bytes)
+{
+  if (!ns_page_size)
+    ns_page_size = (unsigned) getpagesize ();
+  return (bytes / ns_page_size) * ns_page_size;
+}
+
+/* Round BYTES up to the nearest multiple of the memory page size,
+   and return it. */
+unsigned
+NSRoundUpToMultipleOfPageSize (unsigned bytes)
+{
+  if (!ns_page_size)
+    ns_page_size = (unsigned) getpagesize ();
+  return ((bytes % ns_page_size)
+	  ? ((bytes / ns_page_size + 1) * ns_page_size)
+	  : bytes);
+}
+
+unsigned
+NSRealMemoryAvailable ()
+{
+  fprintf (stderr, "NSRealMemoryAvailable() not implemented.\n");
+  return 0;
+}
+
+void *
+NSAllocateMemoryPages (unsigned bytes)
+{
+#if __mach__
+  void *where;
+  kern_return_t r;
+  r = vm_allocate (mach_task_self(), &where, (vm_size_t) bytes, 1);
+  NSParameterAssert (r == KERN_SUCCESS);
+  return where;
+#else
+  return calloc (bytes, 1);
+#endif
+}
+
+void
+NSDeallocateMemoryPages (void *ptr, unsigned bytes)
+{
+#if __mach__
+  vm_deallocate (mach_task_self (), ptr, bytes);
+#else
+  free (ptr);
+#endif
+}
+
+void
+NSCopyMemoryPages (const void *source, void *dest, unsigned bytes)
+{
+#if __mach__
+  kern_return_t r;
+  r = vm_copy (mach_task_self(), source, bytes, dest);
+  NSParameterAssert (r == KERN_SUCCESS);
+#else
+  memcpy (dest, source, bytes);
+#endif
+}
+