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// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.
#include "element_impl.hpp"
#include <gras/top_block.hpp>
#include <boost/thread/thread.hpp> //sleep
using namespace gras;
TopBlock::TopBlock(void)
{
//NOP
}
TopBlock::TopBlock(const std::string &name):
HierBlock(name)
{
(*this)->executor.reset(new Apology::Executor((*this)->topology.get()));
(*this)->token = Token::make();
(*this)->thread_group = SharedThreadGroup(new boost::thread_group());
}
TopBlock::~TopBlock(void)
{
//NOP
}
void ElementImpl::top_block_cleanup(void)
{
this->bcast_prio_msg(TopInertMessage());
this->topology->clear_all();
this->executor->commit();
}
void TopBlock::commit_config(void)
{
HierBlock::commit_config();
}
void TopBlock::commit(void)
{
this->commit_config();
this->start(); //ok to re-start, means update
}
void TopBlock::start(void)
{
(*this)->executor->commit();
{
TopThreadMessage message;
message.thread_group = (*this)->thread_group;
(*this)->bcast_prio_msg(message);
}
{
TopTokenMessage message;
message.token = (*this)->token;
(*this)->bcast_prio_msg(message);
}
{
//send the global block config before alloc
TopConfigMessage message;
message.config = (*this)->global_config;
(*this)->bcast_prio_msg(message);
}
{
(*this)->bcast_prio_msg(TopAllocMessage());
}
{
(*this)->bcast_prio_msg(TopActiveMessage());
}
}
void TopBlock::stop(void)
{
//interrupt these "special" threads
(*this)->thread_group->interrupt_all();
//message all blocks to mark done
(*this)->bcast_prio_msg(TopInertMessage());
}
void TopBlock::run(void)
{
this->start();
this->wait();
}
GRAS_FORCE_INLINE void wait_thread_yield(void)
{
//boost::this_thread::yield();
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
}
static const boost::posix_time::time_duration CHECK_DONE_INTERVAL = boost::posix_time::milliseconds(100);
static const boost::posix_time::time_duration INPUT_DONE_GRACE_PERIOD = boost::posix_time::milliseconds(100);
void TopBlock::wait(void)
{
//We do not need to join "special" threads;
//the token mechainism will do just fine.
//FIXME it might be nice to uncomment this for some nice quiet wait(),
//however, thread group cant be joined twice and this breaks some qa code
//(*this)->thread_group->join_all();
//QA lockup detection setup
bool lockup_debug = getenv("GRAS_LOCKUP_DEBUG") != NULL;
boost::system_time check_done_time = boost::get_system_time();
bool has_a_done = false;
//wait for all blocks to release the token
while (not (*this)->token.unique())
{
wait_thread_yield();
//determine if we should check on the done status
if (boost::get_system_time() < check_done_time) continue;
check_done_time += CHECK_DONE_INTERVAL;
//optional dot print to understand lockup condition
if (has_a_done and lockup_debug)
{
std::cerr << TopBlock::query("{\"path\":\"/topology.dot\"}") << std::endl;
lockup_debug = false;
}
//loop through blocks looking for non-done blocks with done inputs
BOOST_FOREACH(Apology::Worker *w, (*this)->topology->get_workers())
{
BlockActor *actor = dynamic_cast<BlockActor *>(w->get_actor());
if (actor->data->block_state == BLOCK_STATE_DONE) has_a_done = true;
if (actor->data->inputs_done.size() and actor->data->inputs_done.any())
{
const boost::system_time grace_over = actor->data->first_input_done_time + INPUT_DONE_GRACE_PERIOD;
if ((not lockup_debug) and (boost::get_system_time() > grace_over))
{
actor->GetFramework().Send(TopInertMessage(), Theron::Address::Null(), actor->GetAddress());
}
}
}
}
}
bool TopBlock::wait(const double timeout)
{
const boost::system_time exit_time = boost::get_system_time() +
boost::posix_time::microseconds(long(timeout*1e6));
//wait for all blocks to release the token
while (not (*this)->token.unique() or boost::get_system_time() < exit_time)
{
wait_thread_yield();
}
return (*this)->token.unique();
}
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