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| class ThreadManager::Worker : public Runnable { enum STATE { UNINITIALIZED, STARTING, STARTED, STOPPING, STOPPED };
public: Worker(ThreadManager::Impl* manager) : manager_(manager), state_(UNINITIALIZED) {}
~Worker() {}
private: bool isActive() const { return (manager_->workerCount_ <= manager_->workerMaxCount_) || (manager_->state_ == JOINING && !manager_->tasks_.empty()); }
public:
void run() { Guard g(manager_->mutex_); bool active = manager_->workerCount_ < manager_->workerMaxCount_; if (active) { if (++manager_->workerCount_ == manager_->workerMaxCount_) { manager_->workerMonitor_.notify(); } }
while (active) { active = isActive();
while (active && manager_->tasks_.empty()) { manager_->idleCount_++; manager_->monitor_.wait(); active = isActive(); manager_->idleCount_--; }
shared_ptr<ThreadManager::Task> task;
if (active) { if (!manager_->tasks_.empty()) { task = manager_->tasks_.front(); manager_->tasks_.pop_front(); if (task->state_ == ThreadManager::Task::WAITING) { task->state_ = (task->getExpireTime() && task->getExpireTime() < Util::currentTime()) ? ThreadManager::Task::TIMEDOUT : ThreadManager::Task::EXECUTING; } }
if (manager_->pendingTaskCountMax_ != 0 && manager_->tasks_.size() <= manager_->pendingTaskCountMax_ - 1) { manager_->maxMonitor_.notify(); } }
if (task) { if (task->state_ == ThreadManager::Task::EXECUTING) { manager_->mutex_.unlock();
try { task->run(); } catch (const std::exception& e) { GlobalOutput.printf("[ERROR] task->run() raised an exception: %s", e.what()); } catch (...) { GlobalOutput.printf("[ERROR] task->run() raised an unknown exception"); }
manager_->mutex_.lock();
} else if (manager_->expireCallback_) { manager_->expireCallback_(task->getRunnable()); manager_->expiredCount_++; } } }
manager_->deadWorkers_.insert(this->thread()); if (--manager_->workerCount_ == manager_->workerMaxCount_) { manager_->workerMonitor_.notify(); } }
private: ThreadManager::Impl* manager_; friend class ThreadManager::Impl; STATE state_; };
class ThreadManager::Task : public Runnable { public: enum STATE { WAITING, EXECUTING, TIMEDOUT, COMPLETE };
Task(shared_ptr<Runnable> runnable, int64_t expiration = 0LL) : runnable_(runnable), state_(WAITING), expireTime_(expiration != 0LL ? Util::currentTime() + expiration : 0LL) {}
~Task() {}
void run() { if (state_ == EXECUTING) { runnable_->run(); state_ = COMPLETE; } }
shared_ptr<Runnable> getRunnable() { return runnable_; }
int64_t getExpireTime() const { return expireTime_; }
private: shared_ptr<Runnable> runnable_; friend class ThreadManager::Worker; STATE state_; int64_t expireTime_; };
void ThreadManager::Impl::addWorker(size_t value) { std::set<shared_ptr<Thread> > newThreads; for (size_t ix = 0; ix < value; ix++) { shared_ptr<ThreadManager::Worker> worker = shared_ptr<ThreadManager::Worker>(new ThreadManager::Worker(this)); newThreads.insert(threadFactory_->newThread(worker)); }
Guard g(mutex_); workerMaxCount_ += value; workers_.insert(newThreads.begin(), newThreads.end());
for (std::set<shared_ptr<Thread> >::iterator ix = newThreads.begin(); ix != newThreads.end(); ++ix) { shared_ptr<ThreadManager::Worker> worker = dynamic_pointer_cast<ThreadManager::Worker, Runnable>((*ix)->runnable()); worker->state_ = ThreadManager::Worker::STARTING; (*ix)->start(); idMap_.insert(std::pair<const Thread::id_t, shared_ptr<Thread> >((*ix)->getId(), *ix)); }
while (workerCount_ != workerMaxCount_) { workerMonitor_.wait(); } }
void ThreadManager::Impl::add(shared_ptr<Runnable> value, int64_t timeout, int64_t expiration) { Guard g(mutex_, timeout);
if (!g) { throw TimedOutException(); }
if (state_ != ThreadManager::STARTED) { throw IllegalStateException( "ThreadManager::Impl::add ThreadManager " "not started"); }
if (pendingTaskCountMax_ > 0 && (tasks_.size() >= pendingTaskCountMax_)) { removeExpired(true); }
if (pendingTaskCountMax_ > 0 && (tasks_.size() >= pendingTaskCountMax_)) { if (canSleep() && timeout >= 0) { while (pendingTaskCountMax_ > 0 && tasks_.size() >= pendingTaskCountMax_) { maxMonitor_.wait(timeout); } } else { throw TooManyPendingTasksException(); } }
tasks_.push_back(shared_ptr<ThreadManager::Task>(new ThreadManager::Task(value, expiration)));
if (idleCount_ > 0) { monitor_.notify(); } }
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