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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "threadimpl.h"
#include "threadpoolimpl.h"
#include <vespa/storageframework/generic/clock/clock.h>
#include <vespa/vespalib/util/atomic.h>
#include <vespa/vespalib/util/signalhandler.h>
#include <cinttypes>
#include <vespa/log/bufferedlogger.h>
LOG_SETUP(".framework.thread.impl");
using namespace vespalib::atomic;
namespace storage::framework::defaultimplementation {
ThreadImpl::ThreadImpl(ThreadPoolImpl& pool,
Runnable& runnable,
vespalib::stringref id,
vespalib::duration waitTime,
vespalib::duration maxProcessTime,
int ticksBeforeWait,
std::optional<vespalib::CpuUsage::Category> cpu_category)
: Thread(id),
_pool(pool),
_runnable(runnable),
_properties(waitTime, maxProcessTime, ticksBeforeWait),
_tickData(),
_tickDataPtr(0),
_interrupted(false),
_joined(false),
_thread(),
_cpu_category(cpu_category)
{
_tickData[load_relaxed(_tickDataPtr)]._lastTick = pool.getClock().getMonotonicTime();
_thread = std::thread([this](){run();});
}
ThreadImpl::~ThreadImpl()
{
interrupt();
join();
}
void
ThreadImpl::run()
{
if (_cpu_category.has_value()) {
auto usage = vespalib::CpuUsage::use(_cpu_category.value());
_runnable.run(*this);
} else {
_runnable.run(*this);
}
_pool.unregisterThread(*this);
_joined = true;
}
bool
ThreadImpl::interrupted() const
{
return _interrupted.load(std::memory_order_relaxed);
}
bool
ThreadImpl::joined() const
{
return _joined;
}
void
ThreadImpl::interrupt()
{
_interrupted.store(true, std::memory_order_relaxed);
}
void
ThreadImpl::join()
{
if (_thread.joinable()) {
_thread.join();
}
}
vespalib::string
ThreadImpl::get_live_thread_stack_trace() const
{
auto native_handle = const_cast<std::thread&>(_thread).native_handle();
return vespalib::SignalHandler::get_cross_thread_stack_trace(native_handle);
}
void
ThreadImpl::registerTick(CycleType cycleType) {
registerTick(cycleType, _pool.getClock().getMonotonicTime());
}
void
ThreadImpl::registerTick(CycleType cycleType, vespalib::steady_time now)
{
if (now.time_since_epoch() == vespalib::duration::zero()) now = _pool.getClock().getMonotonicTime();
ThreadTickData data(getTickData());
vespalib::steady_clock::time_point previousTick = data._lastTick;
data._lastTick = now;
data._lastTickType = cycleType;
setTickData(data);
if (data._lastTick.time_since_epoch() == vespalib::duration::zero()) { return; }
if (previousTick > now) {
LOGBP(warning, "Thread is registering tick at time %" PRIu64 ", but "
"last time it registered a tick, the time was %" PRIu64
". Assuming clock has been adjusted backwards",
vespalib::count_ms(now.time_since_epoch()), vespalib::count_ms(previousTick.time_since_epoch()));
return;
}
vespalib::duration cycleTime = now - previousTick;
if (cycleType == WAIT_CYCLE) {
data._maxWaitTimeSeen = std::max(data._maxWaitTimeSeen, cycleTime);
} else {
data._maxProcessingTimeSeen = std::max(data._maxProcessingTimeSeen, cycleTime);
}
}
ThreadTickData
ThreadImpl::getTickData() const
{
return _tickData[load_acquire(_tickDataPtr)].loadRelaxed();
}
void
ThreadImpl::setTickData(const ThreadTickData& tickData)
{
uint32_t nextData = (load_relaxed(_tickDataPtr) + 1) % _tickData.size();
_tickData[nextData].storeRelaxed(tickData);
store_release(_tickDataPtr, nextData);
}
ThreadTickData
ThreadImpl::AtomicThreadTickData::loadRelaxed() const noexcept
{
ThreadTickData result;
constexpr auto relaxed = std::memory_order_relaxed;
result._lastTickType = _lastTickType.load(relaxed);
result._lastTick = _lastTick.load(relaxed);
result._maxProcessingTimeSeen = _maxProcessingTimeSeen.load(relaxed);
result._maxWaitTimeSeen = _maxWaitTimeSeen.load(relaxed);
return result;
}
void
ThreadImpl::AtomicThreadTickData::storeRelaxed(const ThreadTickData& newState) noexcept
{
constexpr auto relaxed = std::memory_order_relaxed;
_lastTickType.store(newState._lastTickType, relaxed);
_lastTick.store(newState._lastTick, relaxed);
_maxProcessingTimeSeen.store(newState._maxProcessingTimeSeen, relaxed);
_maxWaitTimeSeen.store(newState._maxWaitTimeSeen, relaxed);
}
}
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