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/**
* @file workqueue.cpp
* @author Nat Goodspeed
* @date 2021-10-06
* @brief Implementation for WorkQueue.
*
* $LicenseInfo:firstyear=2021&license=viewerlgpl$
* Copyright (c) 2021, Linden Research, Inc.
* $/LicenseInfo$
*/
// Precompiled header
#include "linden_common.h"
// associated header
#include "workqueue.h"
// STL headers
// std headers
// external library headers
// other Linden headers
#include "llcoros.h"
#include LLCOROS_MUTEX_HEADER
#include "llerror.h"
#include "llexception.h"
#include "stringize.h"
using Mutex = LLCoros::Mutex;
using Lock = LLCoros::LockType;
LL::WorkQueue::WorkQueue(const std::string& name, size_t capacity):
super(makeName(name)),
mQueue(capacity)
{
// TODO: register for "LLApp" events so we can implicitly close() on
// viewer shutdown.
}
void LL::WorkQueue::close()
{
mQueue.close();
}
size_t LL::WorkQueue::size()
{
return mQueue.size();
}
bool LL::WorkQueue::isClosed()
{
return mQueue.isClosed();
}
bool LL::WorkQueue::done()
{
return mQueue.done();
}
void LL::WorkQueue::runUntilClose()
{
try
{
for (;;)
{
LL_PROFILE_ZONE_SCOPED;
callWork(mQueue.pop());
}
}
catch (const Queue::Closed&)
{
}
}
bool LL::WorkQueue::runPending()
{
LL_PROFILE_ZONE_SCOPED;
for (Work work; mQueue.tryPop(work); )
{
callWork(work);
}
return ! mQueue.done();
}
bool LL::WorkQueue::runOne()
{
Work work;
if (mQueue.tryPop(work))
{
callWork(work);
}
return ! mQueue.done();
}
bool LL::WorkQueue::runUntil(const TimePoint& until)
{
LL_PROFILE_ZONE_SCOPED;
// Should we subtract some slop to allow for typical Work execution time?
// How much slop?
// runUntil() is simply a time-bounded runPending().
for (Work work; TimePoint::clock::now() < until && mQueue.tryPop(work); )
{
callWork(work);
}
return ! mQueue.done();
}
std::string LL::WorkQueue::makeName(const std::string& name)
{
if (! name.empty())
return name;
static U32 discriminator = 0;
static Mutex mutex;
U32 num;
{
// Protect discriminator from concurrent access by different threads.
// It can't be thread_local, else two racing threads will come up with
// the same name.
Lock lk(mutex);
num = discriminator++;
}
return STRINGIZE("WorkQueue" << num);
}
void LL::WorkQueue::callWork(const Queue::DataTuple& work)
{
// ThreadSafeSchedule::pop() always delivers a tuple, even when
// there's only one data field per item, as for us.
callWork(std::get<0>(work));
}
void LL::WorkQueue::callWork(const Work& work)
{
LL_PROFILE_ZONE_SCOPED;
try
{
work();
}
catch (...)
{
// No matter what goes wrong with any individual work item, the worker
// thread must go on! Log our own instance name with the exception.
LOG_UNHANDLED_EXCEPTION(getKey());
}
}
void LL::WorkQueue::error(const std::string& msg)
{
LL_ERRS("WorkQueue") << msg << LL_ENDL;
}
void LL::WorkQueue::checkCoroutine(const std::string& method)
{
// By convention, the default coroutine on each thread has an empty name
// string. See also LLCoros::logname().
if (LLCoros::getName().empty())
{
LLTHROW(Error("Do not call " + method + " from a thread's default coroutine"));
}
}
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