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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "document_runnable.h"
#include <vespa/vespalib/util/exceptions.h>
#include <cassert>
namespace document {
Runnable::Runnable()
: _stateLock(),
_stateCond(),
_state(NOT_RUNNING)
{
}
Runnable::~Runnable() {
std::lock_guard monitorGuard(_stateLock);
assert(_state == NOT_RUNNING);
}
bool Runnable::start(FastOS_ThreadPool& pool)
{
std::unique_lock guard(_stateLock);
_stateCond.wait(guard, [&](){ return (_state != STOPPING);});
if (_state != NOT_RUNNING) return false;
_state = STARTING;
if (pool.NewThread(this) == nullptr) {
throw vespalib::IllegalStateException("Failed starting a new thread", VESPA_STRLOC);
}
return true;
}
bool Runnable::stop()
{
std::lock_guard monitor(_stateLock);
if (_state == STOPPING || _state == NOT_RUNNING) return false;
GetThread()->SetBreakFlag();
_state = STOPPING;
return onStop();
}
bool Runnable::onStop()
{
return true;
}
bool Runnable::join() const
{
std::unique_lock guard(_stateLock);
assert ((_state != STARTING) && (_state != RUNNING));
_stateCond.wait(guard, [&](){ return (_state == NOT_RUNNING);});
return true;
}
void Runnable::Run(FastOS_ThreadInterface*, void*)
{
{
std::lock_guard guard(_stateLock);
// Dont set state if its alreadyt at stopping. (And let run() be
// called even though about to stop for consistency)
if (_state == STARTING) {
_state = RUNNING;
}
}
// By not catching exceptions, they should abort whole application.
// We should thus not need to have a catch all to set state to not
// running.
run();
{
std::lock_guard guard(_stateLock);
_state = NOT_RUNNING;
_stateCond.notify_all();
}
}
}
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