1f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch/*
2f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * libjingle
3f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * Copyright 2004--2006, Google Inc.
4f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *
5f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * Redistribution and use in source and binary forms, with or without
6f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * modification, are permitted provided that the following conditions are met:
7f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *
8f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *  1. Redistributions of source code must retain the above copyright notice,
9f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *     this list of conditions and the following disclaimer.
10f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *  2. Redistributions in binary form must reproduce the above copyright notice,
11f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *     this list of conditions and the following disclaimer in the documentation
12f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *     and/or other materials provided with the distribution.
13f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *  3. The name of the author may not be used to endorse or promote products
14f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *     derived from this software without specific prior written permission.
15f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch *
16f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch */
27f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
28f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#include "talk/base/task.h"
29f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#include "talk/base/common.h"
30f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#include "talk/base/taskrunner.h"
31f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
32f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochnamespace talk_base {
33f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
34f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochint32 Task::unique_id_seed_ = 0;
35f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
36f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen MurdochTask::Task(TaskParent *parent)
37f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    : TaskParent(this, parent),
38f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      state_(STATE_INIT),
39f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      blocked_(false),
40f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      done_(false),
41f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      aborted_(false),
42f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      busy_(false),
43f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      error_(false),
44f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      start_time_(0),
45f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      timeout_time_(0),
46f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      timeout_seconds_(0),
47f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      timeout_suspended_(false)  {
48f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  unique_id_ = unique_id_seed_++;
49f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
50f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // sanity check that we didn't roll-over our id seed
513345a6884c488ff3a535c2c9acdd33d74b37e311Iain Merrick  ASSERT(unique_id_ < unique_id_seed_);
52f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
53f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
54f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen MurdochTask::~Task() {
55f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // Is this task being deleted in the correct manner?
56f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  ASSERT(!done_ || GetRunner()->is_ok_to_delete(this));
57f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  ASSERT(state_ == STATE_INIT || done_);
58f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  ASSERT(state_ == STATE_INIT || blocked_);
59f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
60f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // If the task is being deleted without being done, it
61f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // means that it hasn't been removed from its parent.
62f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // This happens if a task is deleted outside of TaskRunner.
63f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (!done_) {
64f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    Stop();
65f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
66f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
67f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
68f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochint64 Task::CurrentTime() {
69f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  return GetRunner()->CurrentTime();
70f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
71f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
72f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochint64 Task::ElapsedTime() {
73f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  return CurrentTime() - start_time_;
74f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
75f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
76f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::Start() {
77f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (state_ != STATE_INIT)
78f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
79f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // Set the start time before starting the task.  Otherwise if the task
80f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // finishes quickly and deletes the Task object, setting start_time_
81f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // will crash.
82f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  start_time_ = CurrentTime();
83f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  GetRunner()->StartTask(this);
84f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
85f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
86f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::Step() {
87f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (done_) {
88f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#ifdef _DEBUG
89f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // we do not know how !blocked_ happens when done_ - should be impossible.
90f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // But it causes problems, so in retail build, we force blocked_, and
91f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // under debug we assert.
923345a6884c488ff3a535c2c9acdd33d74b37e311Iain Merrick    ASSERT(blocked_);
93f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#else
94f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = true;
95f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#endif
96f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
97f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
98f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
99f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // Async Error() was called
100f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (error_) {
101f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    done_ = true;
102f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    state_ = STATE_ERROR;
103f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = true;
104f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch//   obsolete - an errored task is not considered done now
105f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch//   SignalDone();
106f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
107f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    Stop();
108f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#ifdef _DEBUG
109f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // verify that stop removed this from its parent
1103345a6884c488ff3a535c2c9acdd33d74b37e311Iain Merrick    ASSERT(!parent()->IsChildTask(this));
111f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#endif
112f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
113f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
114f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
115f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  busy_ = true;
116f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  int new_state = Process(state_);
117f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  busy_ = false;
118f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
119f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (aborted_) {
120f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    Abort(true);  // no need to wake because we're awake
121f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
122f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
123f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
124f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (new_state == STATE_BLOCKED) {
125f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = true;
126f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // Let the timeout continue
127f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  } else {
128f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    state_ = new_state;
129f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = false;
130f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    ResetTimeout();
131f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
132f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
133f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (new_state == STATE_DONE) {
134f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    done_ = true;
135f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  } else if (new_state == STATE_ERROR) {
136f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    done_ = true;
137f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    error_ = true;
138f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
139f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
140f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (done_) {
141f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch//  obsolete - call this yourself
142f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch//    SignalDone();
143f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
144f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    Stop();
145f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#if _DEBUG
146f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // verify that stop removed this from its parent
1473345a6884c488ff3a535c2c9acdd33d74b37e311Iain Merrick    ASSERT(!parent()->IsChildTask(this));
148f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#endif
149f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = true;
150f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
151f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
152f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
153f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::Abort(bool nowake) {
154f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // Why only check for done_ (instead of "aborted_ || done_")?
155f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  //
156f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // If aborted_ && !done_, it means the logic for aborting still
157f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // needs to be executed (because busy_ must have been true when
158f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // Abort() was previously called).
159f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (done_)
160f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
161f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  aborted_ = true;
162f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (!busy_) {
163f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    done_ = true;
164f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = true;
165f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    error_ = true;
166f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
167f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // "done_" is set before calling "Stop()" to ensure that this code
168f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // doesn't execute more than once (recursively) for the same task.
169f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    Stop();
170f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#ifdef _DEBUG
171f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    // verify that stop removed this from its parent
1723345a6884c488ff3a535c2c9acdd33d74b37e311Iain Merrick    ASSERT(!parent()->IsChildTask(this));
173f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch#endif
174f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    if (!nowake) {
175f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      // WakeTasks to self-delete.
176f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      // Don't call Wake() because it is a no-op after "done_" is set.
177f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      // Even if Wake() did run, it clears "blocked_" which isn't desireable.
178f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      GetRunner()->WakeTasks();
179f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    }
180f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
181f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
182f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
183f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::Wake() {
184f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (done_)
185f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
186f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (blocked_) {
187f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    blocked_ = false;
188f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    GetRunner()->WakeTasks();
189f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
190f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
191f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
192f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::Error() {
193f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (error_ || done_)
194f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    return;
195f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  error_ = true;
196f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  Wake();
197f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
198f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
199f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochstd::string Task::GetStateName(int state) const {
200f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_BLOCKED("BLOCKED");
201f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_INIT("INIT");
202f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_START("START");
203f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_DONE("DONE");
204f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_ERROR("ERROR");
205f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_RESPONSE("RESPONSE");
206f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  static const std::string STR_HUH("??");
207f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  switch (state) {
208f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    case STATE_BLOCKED: return STR_BLOCKED;
209f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    case STATE_INIT: return STR_INIT;
210f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    case STATE_START: return STR_START;
211f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    case STATE_DONE: return STR_DONE;
212f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    case STATE_ERROR: return STR_ERROR;
213f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    case STATE_RESPONSE: return STR_RESPONSE;
214f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
215f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  return STR_HUH;
216f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
217f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
218f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochint Task::Process(int state) {
219f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  int newstate = STATE_ERROR;
220f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
221f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (TimedOut()) {
222f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    ClearTimeout();
223f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    newstate = OnTimeout();
224f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    SignalTimeout();
225f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  } else {
226f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    switch (state) {
227f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      case STATE_INIT:
228f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        newstate = STATE_START;
229f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        break;
230f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      case STATE_START:
231f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        newstate = ProcessStart();
232f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        break;
233f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      case STATE_RESPONSE:
234f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        newstate = ProcessResponse();
235f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        break;
236f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      case STATE_DONE:
237f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch      case STATE_ERROR:
238f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        newstate = STATE_BLOCKED;
239f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch        break;
240f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    }
241f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
242f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
243f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  return newstate;
244f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
245f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
246f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::Stop() {
247f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  // No need to wake because we're either awake or in abort
248f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  TaskParent::OnStopped(this);
249f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
250f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
251f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::set_timeout_seconds(const int timeout_seconds) {
252f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  timeout_seconds_ = timeout_seconds;
253f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  ResetTimeout();
254f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
255f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
256f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochbool Task::TimedOut() {
257f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  return timeout_seconds_ &&
258f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    timeout_time_ &&
259f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    CurrentTime() >= timeout_time_;
260f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
261f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
262f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::ResetTimeout() {
263f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  int64 previous_timeout_time = timeout_time_;
264f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  bool timeout_allowed = (state_ != STATE_INIT)
265f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch                      && (state_ != STATE_DONE)
266f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch                      && (state_ != STATE_ERROR);
267f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (timeout_seconds_ && timeout_allowed && !timeout_suspended_)
268f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    timeout_time_ = CurrentTime() +
269f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch                    (timeout_seconds_ * kSecToMsec * kMsecTo100ns);
270f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  else
271f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    timeout_time_ = 0;
272f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
273f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  GetRunner()->UpdateTaskTimeout(this, previous_timeout_time);
274f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
275f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
276f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::ClearTimeout() {
277f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  int64 previous_timeout_time = timeout_time_;
278f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  timeout_time_ = 0;
279f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  GetRunner()->UpdateTaskTimeout(this, previous_timeout_time);
280f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
281f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
282f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::SuspendTimeout() {
283f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (!timeout_suspended_) {
284f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    timeout_suspended_ = true;
285f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    ResetTimeout();
286f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
287f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
288f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
289f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdochvoid Task::ResumeTimeout() {
290f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  if (timeout_suspended_) {
291f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    timeout_suspended_ = false;
292f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch    ResetTimeout();
293f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch  }
294f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch}
295f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch
296f74420b3285b9fe04a7e00aa3b8c0ab07ea344bcBen Murdoch} // namespace talk_base
297