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28 #include "talk/base/task.h"
29 #include "talk/base/common.h"
30 #include "talk/base/taskrunner.h"
34 int32 Task::unique_id_seed_ = 0;
36 Task::Task(TaskParent *parent)
37 : TaskParent(this, parent),
47 timeout_suspended_(false) {
48 unique_id_ = unique_id_seed_++;
50 // sanity check that we didn't roll-over our id seed
51 ASSERT(unique_id_ < unique_id_seed_);
55 // Is this task being deleted in the correct manner?
56 ASSERT(!done_ || GetRunner()->is_ok_to_delete(this));
57 ASSERT(state_ == STATE_INIT || done_);
58 ASSERT(state_ == STATE_INIT || blocked_);
60 // If the task is being deleted without being done, it
61 // means that it hasn't been removed from its parent.
62 // This happens if a task is deleted outside of TaskRunner.
68 int64 Task::CurrentTime() {
69 return GetRunner()->CurrentTime();
72 int64 Task::ElapsedTime() {
73 return CurrentTime() - start_time_;
77 if (state_ != STATE_INIT)
79 // Set the start time before starting the task. Otherwise if the task
80 // finishes quickly and deletes the Task object, setting start_time_
82 start_time_ = CurrentTime();
83 GetRunner()->StartTask(this);
89 // we do not know how !blocked_ happens when done_ - should be impossible.
90 // But it causes problems, so in retail build, we force blocked_, and
91 // under debug we assert.
99 // Async Error() was called
102 state_ = STATE_ERROR;
104 // obsolete - an errored task is not considered done now
109 // verify that stop removed this from its parent
110 ASSERT(!parent()->IsChildTask(this));
116 int new_state = Process(state_);
120 Abort(true); // no need to wake because we're awake
124 if (new_state == STATE_BLOCKED) {
126 // Let the timeout continue
133 if (new_state == STATE_DONE) {
135 } else if (new_state == STATE_ERROR) {
141 // obsolete - call this yourself
146 // verify that stop removed this from its parent
147 ASSERT(!parent()->IsChildTask(this));
153 void Task::Abort(bool nowake) {
154 // Why only check for done_ (instead of "aborted_ || done_")?
156 // If aborted_ && !done_, it means the logic for aborting still
157 // needs to be executed (because busy_ must have been true when
158 // Abort() was previously called).
167 // "done_" is set before calling "Stop()" to ensure that this code
168 // doesn't execute more than once (recursively) for the same task.
171 // verify that stop removed this from its parent
172 ASSERT(!parent()->IsChildTask(this));
175 // WakeTasks to self-delete.
176 // Don't call Wake() because it is a no-op after "done_" is set.
177 // Even if Wake() did run, it clears "blocked_" which isn't desireable.
178 GetRunner()->WakeTasks();
188 GetRunner()->WakeTasks();
199 std::string Task::GetStateName(int state) const {
201 case STATE_BLOCKED: return "BLOCKED";
202 case STATE_INIT: return "INIT";
203 case STATE_START: return "START";
204 case STATE_DONE: return "DONE";
205 case STATE_ERROR: return "ERROR";
206 case STATE_RESPONSE: return "RESPONSE";
211 int Task::Process(int state) {
212 int newstate = STATE_ERROR;
216 newstate = OnTimeout();
221 newstate = STATE_START;
224 newstate = ProcessStart();
227 newstate = ProcessResponse();
231 newstate = STATE_BLOCKED;
240 // No need to wake because we're either awake or in abort
241 TaskParent::OnStopped(this);
244 void Task::set_timeout_seconds(const int timeout_seconds) {
245 timeout_seconds_ = timeout_seconds;
249 bool Task::TimedOut() {
250 return timeout_seconds_ &&
252 CurrentTime() >= timeout_time_;
255 void Task::ResetTimeout() {
256 int64 previous_timeout_time = timeout_time_;
257 bool timeout_allowed = (state_ != STATE_INIT)
258 && (state_ != STATE_DONE)
259 && (state_ != STATE_ERROR);
260 if (timeout_seconds_ && timeout_allowed && !timeout_suspended_)
261 timeout_time_ = CurrentTime() +
262 (timeout_seconds_ * kSecToMsec * kMsecTo100ns);
266 GetRunner()->UpdateTaskTimeout(this, previous_timeout_time);
269 void Task::ClearTimeout() {
270 int64 previous_timeout_time = timeout_time_;
272 GetRunner()->UpdateTaskTimeout(this, previous_timeout_time);
275 void Task::SuspendTimeout() {
276 if (!timeout_suspended_) {
277 timeout_suspended_ = true;
282 void Task::ResumeTimeout() {
283 if (timeout_suspended_) {
284 timeout_suspended_ = false;
289 } // namespace talk_base