| // 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_ |