mem: add mmap allocator

use it for heaps and fiber stacks.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/mem-mmap.c b/src/mem-mmap.c
new file mode 100644
index 0000000..b8e83cb
--- /dev/null
+++ b/src/mem-mmap.c
@@ -0,0 +1,41 @@
+/* mem-mmap.c - mmap wrappings for large memory allocation
+ *
+ * Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 or later as
+ * published by the Free Software Foundation.
+ *
+ * See http://www.gnu.org/ for details.
+ */
+
+#include <sys/mman.h>
+#include <libtf/defines.h>
+#include <libtf/memory.h>
+
+void *tf_bmem_alloc(size_t size)
+{
+	void *ptr;
+
+	ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+		   MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+	if (ptr == MAP_FAILED)
+		return NULL;
+	return ptr;
+}
+
+void *tf_bmem_resize(void *oldptr, size_t oldsize, size_t newsize)
+{
+	void *ptr;
+
+	ptr = mremap(oldptr, oldsize, newsize, MREMAP_MAYMOVE);
+	if (ptr == MAP_FAILED)
+		return NULL;
+	return ptr;
+}
+
+void tf_bmem_free(void *ptr, size_t size)
+{
+	munmap(ptr, size);
+}