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/**
* @file threadpool.cpp
* @author Nat Goodspeed
* @date 2021-10-21
* @brief Implementation for threadpool.
*
* $LicenseInfo:firstyear=2021&license=viewerlgpl$
* Copyright (c) 2021, Linden Research, Inc.
* $/LicenseInfo$
*/
// Precompiled header
#include "linden_common.h"
// associated header
#include "threadpool.h"
// STL headers
// std headers
// external library headers
// other Linden headers
#include "llerror.h"
#include "llevents.h"
#include "stringize.h"
LL::ThreadPool::ThreadPool(const std::string& name, size_t threads, size_t capacity):
mQueue(name, capacity),
mName("ThreadPool:" + name),
mThreadCount(threads)
{}
void LL::ThreadPool::start()
{
for (size_t i = 0; i < mThreadCount; ++i)
{
std::string tname{ stringize(mName, ':', (i+1), '/', mThreadCount) };
mThreads.emplace_back(tname, [this, tname]()
{
LL_PROFILER_SET_THREAD_NAME(tname.c_str());
run(tname);
});
}
// Listen on "LLApp", and when the app is shutting down, close the queue
// and join the workers.
LLEventPumps::instance().obtain("LLApp").listen(
mName,
[this](const LLSD& stat)
{
std::string status(stat["status"]);
if (status != "running")
{
// viewer is starting shutdown -- proclaim the end is nigh!
LL_DEBUGS("ThreadPool") << mName << " saw " << status << LL_ENDL;
close();
}
return false;
});
}
LL::ThreadPool::~ThreadPool()
{
close();
}
void LL::ThreadPool::close()
{
if (! mQueue.isClosed())
{
LL_DEBUGS("ThreadPool") << mName << " closing queue and joining threads" << LL_ENDL;
mQueue.close();
for (auto& pair: mThreads)
{
LL_DEBUGS("ThreadPool") << mName << " waiting on thread " << pair.first << LL_ENDL;
pair.second.join();
}
LL_DEBUGS("ThreadPool") << mName << " shutdown complete" << LL_ENDL;
}
}
void LL::ThreadPool::run(const std::string& name)
{
LL_DEBUGS("ThreadPool") << name << " starting" << LL_ENDL;
run();
LL_DEBUGS("ThreadPool") << name << " stopping" << LL_ENDL;
}
void LL::ThreadPool::run()
{
mQueue.runUntilClose();
}
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