[PATCH v11 12/28] scripts/gdb: Add task iteration class

[Jan Kiszka <jan.kiszka@siemens.com>]

This class allows to iterate over all tasks of the target.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 scripts/gdb/linux/tasks.py | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 scripts/gdb/linux/tasks.py

diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
new file mode 100644
index 0000000..cd25984
--- /dev/null
+++ b/scripts/gdb/linux/tasks.py
@@ -0,0 +1,46 @@
+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+#  task & thread tools
+#
+# Copyright (c) Siemens AG, 2011-2013
+#
+# Authors:
+#  Jan Kiszka <jan.kiszka@siemens.com>
+#
+# This work is licensed under the terms of the GNU GPL version 2.
+#
+
+import gdb
+
+from linux import utils
+
+
+task_type = utils.CachedType("struct task_struct")
+
+
+class TaskList:
+    def __init__(self):
+        global task_type
+        self.task_ptr_type = task_type.get_type().pointer()
+        self.init_task = gdb.parse_and_eval("init_task")
+        self.curr_group = self.init_task.address
+        self.curr_task = None
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        t = self.curr_task
+        if not t or t == self.curr_group:
+            self.curr_group = \
+                utils.container_of(self.curr_group['tasks']['next'],
+                                   self.task_ptr_type, "tasks")
+            if self.curr_group == self.init_task.address:
+                raise StopIteration
+            t = self.curr_task = self.curr_group
+        else:
+            self.curr_task = \
+                utils.container_of(t['thread_group']['next'],
+                                   self.task_ptr_type, "thread_group")
+        return t
-- 
2.1.4