Imported BitmapManager code. Not documented yet.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2700 a95241bf-73f2-0310-859d-f6bbb57e9c96
2003-02-13 00:03:31 +00:00
parent e16ebaf892
commit fde0b388cc
7 changed files with 1429 additions and 1 deletions
@@ -0,0 +1,48 @@
+#include <OS.h>
+#include "bget.h"
+#include <stdio.h>
+
+void * expand_area_storage(long size);
+void contract_area_storage(void *buffer);
+
+void set_area_buffer_management(void)
+{
+	bectl(NULL, expand_area_storage, contract_area_storage, B_PAGE_SIZE);
+}
+
+void * expand_area_storage(long size)
+{
+	long areasize=0;
+	area_id a;
+	int *parea;
+	
+	if(size<B_PAGE_SIZE)
+		areasize=B_PAGE_SIZE;
+	else
+	{
+		if((size % B_PAGE_SIZE)!=0)
+			areasize=((long)(size/B_PAGE_SIZE)+1)*B_PAGE_SIZE;
+		else
+			areasize=size;
+	}
+	a=create_area("bitmap_area",(void**)&parea,B_ANY_ADDRESS,areasize,
+			B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);
+	if(a==B_BAD_VALUE ||
+	   a==B_NO_MEMORY ||
+	   a==B_ERROR)
+	{
+	   	printf("PANIC: BitmapManager couldn't allocate area!!\n");
+	   	return NULL;
+	}
+
+	return parea;
+}
+
+void contract_area_storage(void *buffer)
+{
+	area_id trash=area_for(buffer);
+
+	if(trash==B_ERROR)
+		return;
+	delete_area(trash);
+}