Jeff Thompson | fa30664 | 2013-06-17 15:06:57 -0700 | [diff] [blame^] | 1 | /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */ |
| 2 | /* |
| 3 | * Copyright (c) 2013, Regents of the University of California |
| 4 | * Alexander Afanasyev |
| 5 | * Zhenkai Zhu |
| 6 | * |
| 7 | * BSD license, See the LICENSE file for more information |
| 8 | * |
| 9 | * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu> |
| 10 | * Alexander Afanasyev <alexander.afanasyev@ucla.edu> |
| 11 | */ |
| 12 | |
| 13 | #include "task.h" |
| 14 | #include "scheduler.h" |
| 15 | |
| 16 | static void |
| 17 | eventCallback(evutil_socket_t fd, short what, void *arg) |
| 18 | { |
| 19 | Task *task = static_cast<Task *>(arg); |
| 20 | task->execute(); |
| 21 | task = NULL; |
| 22 | } |
| 23 | |
| 24 | Task::Task(const Callback &callback, const Tag &tag, const SchedulerPtr &scheduler) |
| 25 | : m_callback(callback) |
| 26 | , m_tag(tag) |
| 27 | , m_scheduler(scheduler) |
| 28 | , m_invoked(false) |
| 29 | , m_event(NULL) |
| 30 | , m_tv(NULL) |
| 31 | { |
| 32 | m_event = evtimer_new(scheduler->base(), eventCallback, this); |
| 33 | m_tv = new timeval; |
| 34 | } |
| 35 | |
| 36 | Task::~Task() |
| 37 | { |
| 38 | if (m_event != NULL) |
| 39 | { |
| 40 | event_free(m_event); |
| 41 | m_event = NULL; |
| 42 | } |
| 43 | |
| 44 | if (m_tv != NULL) |
| 45 | { |
| 46 | delete m_tv; |
| 47 | m_tv = NULL; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | void |
| 52 | Task::setTv(double delay) |
| 53 | { |
| 54 | // Alex: when using abs function, i would recommend use it with std:: prefix, otherwise |
| 55 | // the standard one may be used, which converts everything to INT, making a lot of problems |
| 56 | double intPart, fraction; |
| 57 | fraction = modf(std::abs(delay), &intPart); |
| 58 | |
| 59 | m_tv->tv_sec = static_cast<int>(intPart); |
| 60 | m_tv->tv_usec = static_cast<int>((fraction * 1000000)); |
| 61 | } |
| 62 | |
| 63 | void |
| 64 | Task::execute() |
| 65 | { |
| 66 | // m_scheduler->execute(boost::bind(&Task::run, this)); |
| 67 | |
| 68 | // using a shared_ptr of this to ensure that when invoked from executor |
| 69 | // the task object still exists |
| 70 | // otherwise, it could be the case that the run() is to be executed, but before it |
| 71 | // could finish, the TaskPtr gets deleted from scheduler and the task object |
| 72 | // gets destroyed, causing crash |
| 73 | m_scheduler->execute(boost::bind(&Task::run, shared_from_this())); |
| 74 | } |