linux-kernel - [PATCH v12 12/28] scripts/gdb: Add task iteration class

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Message-Id: <d432b9efccd34b50efc157cedded1f341d2995d3.1422602696.git.jan.kiszka@siemens.com>
Date:	Fri, 30 Jan 2015 08:24:41 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Ben Widawsky <ben@...dawsk.net>, Borislav Petkov <bp@...e.de>
Subject: [PATCH v12 12/28] scripts/gdb: Add task iteration class

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

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.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@...mens.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

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