Stack recycling is added to the thread library.

Still, it does not support thread trees which have more than one level depth.

conts/libl4thread/src/stack.c

@@ -0,0 +1,37 @@
+/*
+ * Stack management in libl4thread.
+ *
+ * Copyright © 2009 B Labs Ltd.
+ */
+#include <stdio.h>
+#include <addr.h>
+
+/* Stack virtual region pool */
+static struct address_pool stack_region_pool;
+
+int stack_pool_init(unsigned long stack_start,
+			unsigned long stack_end,
+			unsigned long stack_size)
+{
+	int err;
+
+	/* Initialise the global stack virtual address pool. */
+	if ((err = address_pool_init(&stack_region_pool,
+					stack_start, stack_end,
+					stack_size) < 0)) {
+		printf("Stack address pool initialisation failed.\n");
+		return err;
+	}
+
+	return 0;
+}
+
+void *stack_new_space(int nitems, int size)
+{
+	return address_new(&stack_region_pool, nitems, size);
+}
+
+int stack_delete_space(void *stack_address, int nitems, int size)
+{
+	return address_del(&stack_region_pool, stack_address, nitems, size);
+}