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Executor.cpp
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93 lines (77 loc) · 1.82 KB
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#include "Executor.h"
#include "Task.h"
#include "ThreadPool.h"
#include <cassert>
namespace Sun {
Executor::Executor() {
pool_ = new ThreadPool(std::thread::hardware_concurrency());
}
Executor::~Executor() {
delete pool_;
}
void Executor::run(Task* taskf) {
if (taskf == nullptr) return;
//递归taskf,计算总task 数
totalUnFinishedTaskNum_ = taskf->getTaskNum();
//totalUnFinishedTaskNum_ -= 1;
spawn(taskf);
while (totalUnFinishedTaskNum_>0) {
queue_.wait();
if (queue_.empty()) {
assert(false);
}
Msg msg = queue_.front();
//在pop,之前，先把msg push到队列，从而保证队列始终非空
if (msg.taskState == TaskState::FINISH) {
totalUnFinishedTaskNum_ -= 1;
if (totalUnFinishedTaskNum_ == 0) {
//queue_.stop_wait();
}
for (Task* task : msg.task->successors_) {
task->unfinished_dependents_num_ -= 1;
if (task->unfinished_dependents_num_ == 0) {
spawn(task);
}
}
if (msg.task->parent) {
msg.task->parent->unfinished_children_num_ -= 1;
if (msg.task->parent->unfinished_children_num_ == 0)
{
Msg msg2;
msg2.task = msg.task;
notify(msg2);
}
}
else{
assert(totalUnFinishedTaskNum_ == 0);
}
}
queue_.pop();
}
}
void Executor::spawn(Task* task) {
//如果有子任务，先spawn子任务
if (!task->children_.empty()) {
std::vector<Task*> srcs;
for (auto& it : task->children_) {
if (it->dependents_.empty()) {
srcs.push_back(it);
}
}
for (auto& it : srcs) {
spawn(it);
}
}
else {
auto ftr = pool_->enqueue([task, this]() {
task->run();
Msg msg;
msg.task = task;
notify(msg);
});
}
}
void Executor::notify(const Msg& msg) {
queue_.push(msg);
}
}