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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_
#define SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_
#include "base/basictypes.h"
#include "sandbox/sandbox_export.h"
namespace base { class Thread; }
namespace sandbox {
class SANDBOX_EXPORT ThreadHelpers {
public:
// Check whether the current process is single threaded. |proc_self_tasks|
// can be a file descriptor to /proc/self/task/ and remains owned by the
// caller or -1.
// If |proc_self_tasks| is -1, this method will open /proc/self/task/ and
// crash if it cannot.
static bool IsSingleThreaded(int proc_self_task);
// Crash if the current process is not single threaded. This will wait
// on /proc to be updated. In the case where this doesn't crash, this will
// return promptly. In the case where this does crash, this will first wait
// for a few ms in Debug mode, a few seconds in Release mode.
// If |proc_self_tasks| is -1, this method will open /proc/self/task/ and
// crash if it cannot.
static void AssertSingleThreaded(int proc_self_task);
// Stop |thread| and ensure that it does not have an entry in
// /proc/self/task/ from the point of view of the current thread. This is
// the way to stop threads before calling IsSingleThreaded().
static bool StopThreadAndWatchProcFS(int proc_self_task,
base::Thread* thread);
static const char* GetAssertSingleThreadedErrorMessageForTests();
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(ThreadHelpers);
};
} // namespace sandbox
#endif // SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_
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