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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "simple_thread_bundle.h"
#include "exceptions.h"
#include <cassert>
using namespace vespalib::fixed_thread_bundle;
namespace vespalib {
VESPA_THREAD_STACK_TAG(simple_thread_bundle_executor);
namespace {
struct SignalHook : Runnable {
Signal &signal;
SignalHook(Signal &s) : signal(s) {}
void run() override { signal.send(); }
};
struct BroadcastHook : Runnable {
Signal &signal;
BroadcastHook(Signal &s) : signal(s) {}
void run() override { signal.broadcast(); }
};
struct PartHook : Runnable {
Part part;
PartHook(const Part &p) : part(p) {}
void run() override { part.perform(); }
};
struct HookPair : Runnable {
Runnable::UP first;
Runnable::UP second;
HookPair(Runnable::UP f, Runnable::UP s) : first(std::move(f)), second(std::move(s)) {}
void run() override {
first->run();
second->run();
}
};
Runnable::UP wrap(Runnable *runnable) {
return Runnable::UP(runnable);
}
Runnable::UP chain(Runnable::UP first, Runnable::UP second) {
return std::make_unique<HookPair>(std::move(first), std::move(second));
}
} // namespace vespalib::<unnamed>
//-----------------------------------------------------------------------------
Signal::Signal() noexcept
: valid(true),
generation(0),
monitor(std::make_unique<std::mutex>()),
cond(std::make_unique<std::condition_variable>())
{}
Signal::~Signal() = default;
SimpleThreadBundle::Pool::Pool(size_t bundleSize, init_fun_t init_fun)
: _lock(),
_bundleSize(bundleSize),
_init_fun(init_fun),
_bundles()
{
}
SimpleThreadBundle::Pool::~Pool()
{
while (!_bundles.empty()) {
delete _bundles.back();
_bundles.pop_back();
}
}
SimpleThreadBundle::UP
SimpleThreadBundle::Pool::obtain()
{
{
std::lock_guard guard(_lock);
if (!_bundles.empty()) {
SimpleThreadBundle::UP ret(_bundles.back());
_bundles.pop_back();
return ret;
}
}
return std::make_unique<SimpleThreadBundle>(_bundleSize, _init_fun);
}
void
SimpleThreadBundle::Pool::release(SimpleThreadBundle::UP bundle)
{
std::lock_guard guard(_lock);
_bundles.push_back(bundle.get());
bundle.release();
}
//-----------------------------------------------------------------------------
SimpleThreadBundle::SimpleThreadBundle(size_t size_in, Runnable::init_fun_t init_fun, Strategy strategy)
: _work(),
_signals(),
_workers(),
_hook()
{
if (size_in == 0) {
throw IllegalArgumentException("size must be greater than 0");
}
if (strategy == USE_BROADCAST) {
_signals.resize(1); // share single signal
} else {
_signals.resize(size_in - 1); // separate signal per worker
}
size_t next_unwired = 1;
for (size_t i = 0; i < size_in; ++i) {
Runnable::UP hook(new PartHook(Part(_work, i)));
if (strategy == USE_SIGNAL_TREE) {
for (size_t child = 0; child < 2 && next_unwired < size_in; ++child, ++next_unwired) {
hook = chain(wrap(new SignalHook(_signals[next_unwired - 1])), std::move(hook));
}
} else if (i == 0) { // first thread should wake others
if (strategy == USE_BROADCAST) {
hook = chain(wrap(new BroadcastHook(_signals[0])), std::move(hook));
} else {
assert(strategy == USE_SIGNAL_LIST);
for (; next_unwired < size_in; ++next_unwired) {
hook = chain(wrap(new SignalHook(_signals[next_unwired - 1])), std::move(hook));
}
}
}
if (i == 0) {
_hook = std::move(hook);
} else {
size_t signal_idx = (strategy == USE_BROADCAST) ? 0 : (i - 1);
_workers.push_back(std::make_unique<Worker>(_signals[signal_idx], init_fun, std::move(hook)));
}
}
}
SimpleThreadBundle::~SimpleThreadBundle()
{
for (size_t i = 0; i < _signals.size(); ++i) {
_signals[i].cancel();
}
for (size_t i = 0; i < _workers.size(); ++i) {
_workers[i]->thread.join();
}
}
size_t
SimpleThreadBundle::size() const
{
return (_workers.size() + 1);
}
void
SimpleThreadBundle::run(const std::vector<Runnable*> &targets)
{
if (targets.size() > size()) {
throw IllegalArgumentException("too many targets");
}
if (targets.empty()) {
return;
}
if (targets.size() == 1) {
targets[0]->run();
return;
}
CountDownLatch latch(size());
_work.targets = &targets;
_work.latch = &latch;
_hook->run();
latch.await();
}
SimpleThreadBundle::Worker::Worker(Signal &s, Runnable::init_fun_t init_fun, Runnable::UP h)
: thread(*this, std::move(init_fun)),
signal(s),
hook(std::move(h))
{
thread.start();
}
void
SimpleThreadBundle::Worker::run() {
for (size_t gen = 0; signal.wait(gen) > 0; ) {
hook->run();
}
}
} // namespace vespalib
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