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125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
/*
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* Copyright 2013-2019 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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/******************************************************************************
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* File: timeout.h
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* Description: Millisecond resolution timeouts. Uses a dedicated thread to
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* call an optional callback function upon timeout expiry.
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* Reference:
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*****************************************************************************/
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#ifndef SRSLTE_TIMEOUT_H
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#define SRSLTE_TIMEOUT_H
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#include "srslte/srslte.h"
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#include <pthread.h>
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#include <stdint.h>
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#include <sys/time.h>
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#include <unistd.h>
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namespace srslte {
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class timeout_callback
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{
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public:
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virtual void timeout_expired(uint32_t timeout_id) = 0;
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};
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class timeout
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{
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public:
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timeout() : running(false), callback(NULL), thread(0), timeout_id(0) {}
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~timeout()
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{
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if (running && callback)
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pthread_join(thread, NULL);
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}
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void start(int duration_msec_, uint32_t timeout_id_ = 0, timeout_callback* callback_ = NULL)
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{
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if (duration_msec_ < 0)
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return;
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reset();
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gettimeofday(&start_time[1], NULL);
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duration_msec = duration_msec_;
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running = true;
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timeout_id = timeout_id_;
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callback = callback_;
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if (callback)
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pthread_create(&thread, NULL, &thread_start, this);
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}
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void reset()
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{
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if (callback)
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pthread_cancel(thread);
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running = false;
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}
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static void* thread_start(void* t_)
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{
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timeout* t = (timeout*)t_;
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t->thread_func();
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return NULL;
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}
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void thread_func()
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{
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// substract time elapsed until now from timer duration
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gettimeofday(&start_time[2], NULL);
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get_time_interval(start_time);
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int32_t usec = duration_msec * 1000 - start_time[0].tv_usec;
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if (usec > 0)
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usleep(usec);
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if (callback && running)
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callback->timeout_expired(timeout_id);
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}
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bool expired()
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{
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if (running) {
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gettimeofday(&start_time[2], NULL);
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get_time_interval(start_time);
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return start_time[0].tv_usec > duration_msec * 1000;
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} else {
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return false;
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}
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}
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int32_t get_msec_to_expire()
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{
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if (running) {
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gettimeofday(&start_time[2], NULL);
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get_time_interval(start_time);
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return (duration_msec * 1000 - start_time[0].tv_usec) / 1000;
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}
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return 0;
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}
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bool is_running() { return running; }
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private:
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struct timeval start_time[3];
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pthread_t thread;
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uint32_t timeout_id;
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timeout_callback* callback;
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bool running;
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int duration_msec;
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};
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} // namespace srslte
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#endif // SRSLTE_TIMEOUT_H
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