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31 * This file defines the Task Runner that executes tasks on the mainloop.
34 #ifndef OTBR_COMMON_TASK_RUNNER_HPP_
35 #define OTBR_COMMON_TASK_RUNNER_HPP_
37 #include <openthread-br/config.h>
44 #include "common/mainloop.h"
49 * This class implements the Task Runner that executes
50 * tasks on the mainloop.
57 * This type represents the generic executable task.
60 template <class T> using Task = std::function<T(void)>;
63 * This constructor initializes the Task Runner instance.
69 * This destructor destroys the Task Runner instance.
75 * This method posts a task to the task runner.
77 * Tasks are executed sequentially and follow the First-Come-First-Serve rule.
78 * It is safe to call this method in different threads concurrently.
80 * @param[in] aTask The task to be executed.
83 void Post(const Task<void> &aTask);
86 * This method posts a task and waits for the completion of the task.
88 * Tasks are executed sequentially and follow the First-Come-First-Serve rule.
89 * This method must be called in a thread other than the mainloop thread. Otherwise,
90 * the caller will be blocked forever.
92 * @returns The result returned by the task @p aTask.
95 template <class T> T PostAndWait(const Task<T> &aTask)
99 Post([&]() { pro.set_value(aTask()); });
101 return pro.get_future().get();
105 * This method updates the file descriptor and sets timeout for the mainloop.
107 * This method should only be called on the mainloop thread.
109 * @param[inout] aMainloop A reference to OpenThread mainloop context.
112 void UpdateFdSet(otSysMainloopContext &aMainloop);
115 * This method processes events.
117 * This method should only be called on the mainloop thread.
119 * @param[in] aMainloop A reference to OpenThread mainloop context.
122 void Process(const otSysMainloopContext &aMainloop);
131 void PushTask(const Task<void> &aTask);
134 // The event fds which are used to wakeup the mainloop
135 // when there are pending tasks in the task queue.
138 std::queue<Task<void>> mTaskQueue;
140 // The mutex which protects the `mTaskQueue` from being
141 // simultaneously accessed by multiple threads.
142 std::mutex mTaskQueueMutex;
147 #endif // OTBR_COMMON_TASK_RUNNER_HPP_