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-rw-r--r--third_party/libjingle/files/talk/base/task.cc299
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diff --git a/third_party/libjingle/files/talk/base/task.cc b/third_party/libjingle/files/talk/base/task.cc
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-/*
- * libjingle
- * Copyright 2004--2006, Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <algorithm>
-
-#include "talk/base/task.h"
-#include "talk/base/common.h"
-#include "talk/base/taskrunner.h"
-
-namespace talk_base {
-
-int32 Task::unique_id_seed_ = 0;
-
-Task::Task(Task *parent)
- : state_(STATE_INIT),
- parent_(parent),
- blocked_(false),
- done_(false),
- aborted_(false),
- busy_(false),
- error_(false),
- child_error_(false),
- start_time_(0),
- timeout_seconds_(0),
- timeout_time_(0),
- timeout_suspended_(false) {
- children_.reset(new ChildSet());
- runner_ = ((parent == NULL) ?
- reinterpret_cast<TaskRunner *>(this) :
- parent->GetRunner());
- if (parent_ != NULL) {
- parent_->AddChild(this);
- }
-
- unique_id_ = unique_id_seed_++;
-
- // sanity check that we didn't roll-over our id seed
- ASSERT(unique_id_ < unique_id_seed_);
-}
-
-int64 Task::CurrentTime() {
- return runner_->CurrentTime();
-}
-
-int64 Task::ElapsedTime() {
- return CurrentTime() - start_time_;
-}
-
-void Task::Start() {
- if (state_ != STATE_INIT)
- return;
- // Set the start time before starting the task. Otherwise if the task
- // finishes quickly and deletes the Task object, setting start_time_
- // will crash.
- start_time_ = CurrentTime();
- GetRunner()->StartTask(this);
-}
-
-void Task::Step() {
- if (done_) {
-#ifdef DEBUG
- // we do not know how !blocked_ happens when done_ - should be impossible.
- // But it causes problems, so in retail build, we force blocked_, and
- // under debug we assert.
- assert(blocked_);
-#else
- blocked_ = true;
-#endif
- return;
- }
-
- // Async Error() was called
- if (error_) {
- done_ = true;
- state_ = STATE_ERROR;
- blocked_ = true;
-// obsolete - an errored task is not considered done now
-// SignalDone();
- Stop();
- return;
- }
-
- busy_ = true;
- int new_state = Process(state_);
- busy_ = false;
-
- if (aborted_) {
- Abort(true); // no need to wake because we're awake
- return;
- }
-
- if (new_state == STATE_BLOCKED) {
- blocked_ = true;
- // Let the timeout continue
- } else {
- state_ = new_state;
- blocked_ = false;
- ResetTimeout();
- }
-
- if (new_state == STATE_DONE) {
- done_ = true;
- } else if (new_state == STATE_ERROR) {
- done_ = true;
- error_ = true;
- }
-
- if (done_) {
-// obsolete - call this yourself
-// SignalDone();
- Stop();
- blocked_ = true;
- }
-}
-
-void Task::Abort(bool nowake) {
- if (done_)
- return;
- aborted_ = true;
- if (!busy_) {
- done_ = true;
- blocked_ = true;
- error_ = true;
- Stop();
- if (!nowake)
- GetRunner()->WakeTasks();
- }
-}
-
-void Task::Wake() {
- if (done_)
- return;
- if (blocked_) {
- blocked_ = false;
- GetRunner()->WakeTasks();
- }
-}
-
-void Task::Error() {
- if (error_ || done_)
- return;
- error_ = true;
- Wake();
-}
-
-std::string Task::GetStateName(int state) const {
- static const std::string STR_BLOCKED("BLOCKED");
- static const std::string STR_INIT("INIT");
- static const std::string STR_START("START");
- static const std::string STR_DONE("DONE");
- static const std::string STR_ERROR("ERROR");
- static const std::string STR_RESPONSE("RESPONSE");
- static const std::string STR_HUH("??");
- switch (state) {
- case STATE_BLOCKED: return STR_BLOCKED;
- case STATE_INIT: return STR_INIT;
- case STATE_START: return STR_START;
- case STATE_DONE: return STR_DONE;
- case STATE_ERROR: return STR_ERROR;
- case STATE_RESPONSE: return STR_RESPONSE;
- }
- return STR_HUH;
-}
-
-int Task::Process(int state) {
- int newstate = STATE_ERROR;
-
- if (TimedOut()) {
- ClearTimeout();
- newstate = OnTimeout();
- SignalTimeout();
- } else {
- switch (state) {
- case STATE_INIT:
- newstate = STATE_START;
- break;
- case STATE_START:
- newstate = ProcessStart();
- break;
- case STATE_RESPONSE:
- newstate = ProcessResponse();
- break;
- case STATE_DONE:
- case STATE_ERROR:
- newstate = STATE_BLOCKED;
- break;
- }
- }
-
- return newstate;
-}
-
-void Task::AddChild(Task *child) {
- children_->insert(child);
-}
-
-bool Task::AllChildrenDone() {
- for (ChildSet::iterator it = children_->begin();
- it != children_->end();
- ++it) {
- if (!(*it)->IsDone())
- return false;
- }
- return true;
-}
-
-bool Task::AnyChildError() {
- return child_error_;
-}
-
-void Task::AbortAllChildren() {
- if (children_->size() > 0) {
- ChildSet copy = *children_;
- for (ChildSet::iterator it = copy.begin(); it != copy.end(); ++it) {
- (*it)->Abort(true); // Note we do not wake
- }
- }
-}
-
-void Task::Stop() {
- // No need to wake because we're either awake or in abort
- AbortAllChildren();
- parent_->OnChildStopped(this);
-}
-
-void Task::OnChildStopped(Task *child) {
- if (child->HasError())
- child_error_ = true;
- children_->erase(child);
-}
-
-void Task::set_timeout_seconds(const int timeout_seconds) {
- timeout_seconds_ = timeout_seconds;
- ResetTimeout();
-}
-
-bool Task::TimedOut() {
- return timeout_seconds_ &&
- timeout_time_ &&
- CurrentTime() > timeout_time_;
-}
-
-void Task::ResetTimeout() {
- bool timeout_allowed = (state_ != STATE_INIT)
- && (state_ != STATE_DONE)
- && (state_ != STATE_ERROR);
- if (timeout_seconds_ && timeout_allowed && !timeout_suspended_)
- timeout_time_ = CurrentTime() +
- (timeout_seconds_ * kSecToMsec * kMsecTo100ns);
- else
- timeout_time_ = 0;
-
- GetRunner()->UpdateTaskTimeout(this);
-}
-
-void Task::ClearTimeout() {
- timeout_time_ = 0;
- GetRunner()->UpdateTaskTimeout(this);
-}
-
-void Task::SuspendTimeout() {
- if (!timeout_suspended_) {
- timeout_suspended_ = true;
- ResetTimeout();
- }
-}
-
-void Task::ResumeTimeout() {
- if (timeout_suspended_) {
- timeout_suspended_ = false;
- ResetTimeout();
- }
-}
-
-} // namespace talk_base