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// Copyright 2014 The Chromium Authors
// 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 "sandbox/sandbox_export.h"
namespace base { class Thread; }
namespace sandbox {
class SANDBOX_EXPORT ThreadHelpers {
public:
ThreadHelpers() = delete;
ThreadHelpers(const ThreadHelpers&) = delete;
ThreadHelpers& operator=(const ThreadHelpers&) = delete;
// Checks whether the current process is single threaded. |proc_fd|
// must be a file descriptor to /proc/ and remains owned by the
// caller.
static bool IsSingleThreaded(int proc_fd);
static bool IsSingleThreaded();
// Crashes 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.
static void AssertSingleThreaded(int proc_fd);
static void AssertSingleThreaded();
// Starts |thread| and ensure that it has an entry in /proc/self/task/ from
// the point of view of the current thread.
static bool StartThreadAndWatchProcFS(int proc_fd, base::Thread* thread);
// Stops |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_fd, base::Thread* thread);
static const char* GetAssertSingleThreadedErrorMessageForTests();
};
} // namespace sandbox
#endif // SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_
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