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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "CobEngine.h"
#include "CobThread.h"
#include "CobFile.h"
CR_BIND(CCobEngine, )
CR_REG_METADATA(CCobEngine, (
CR_MEMBER(threadInstances),
CR_MEMBER(tickAddedThreads),
CR_MEMBER(runningThreadIDs),
CR_MEMBER(sleepingThreadIDs),
// always null/empty when saving
CR_IGNORED(waitingThreadIDs),
CR_IGNORED(curThread),
CR_MEMBER(currentTime),
CR_MEMBER(threadCounter)
))
CR_BIND(CCobEngine::SleepingThread, )
CR_REG_METADATA(CCobEngine::SleepingThread, (
CR_MEMBER(id),
CR_MEMBER(wt)
))
int CCobEngine::AddThread(CCobThread&& thread)
{
if (thread.GetID() == -1)
thread.SetID(GenThreadID());
CCobInstance* o = thread.cobInst;
CCobThread& t = threadInstances[thread.GetID()];
// move thread into registry, hand its ID to owner
t = std::move(thread);
o->AddThreadID(t.GetID());
return (t.GetID());
}
// a thread wants to continue running at a later time, and adds itself to the scheduler
void CCobEngine::ScheduleThread(const CCobThread* thread)
{
switch (thread->GetState()) {
case CCobThread::Run: {
waitingThreadIDs.push_back(thread->GetID());
} break;
case CCobThread::Sleep: {
sleepingThreadIDs.push(SleepingThread{thread->GetID(), thread->GetWakeTime()});
} break;
default: {
LOG_L(L_ERROR, "[COBEngine::%s] unknown state %d for thread %d", __func__, thread->GetState(), thread->GetID());
} break;
}
}
void CCobEngine::SanityCheckThreads(const CCobInstance* owner)
{
if (false) {
// no threads belonging to owner should be left
for (const auto& p: threadInstances) {
assert(p.second.cobInst != owner);
}
for (const CCobThread& t: tickAddedThreads) {
assert(t.cobInst != owner);
}
}
}
void CCobEngine::TickThread(CCobThread* thread)
{
// for error messages originating in CUnitScript
curThread = thread;
// NB: threadID is still in <runningThreadIDs> here, TickRunningThreads clears it
if (thread != nullptr && !thread->Tick())
RemoveThread(thread->GetID());
curThread = nullptr;
}
void CCobEngine::WakeSleepingThreads()
{
// check on the sleeping threads, remove any whose owner died
while (!sleepingThreadIDs.empty()) {
CCobThread* zzzThread = GetThread((sleepingThreadIDs.top()).id);
if (zzzThread == nullptr) {
sleepingThreadIDs.pop();
continue;
}
// not yet time to execute this thread or any subsequent sleepers
if (zzzThread->GetWakeTime() >= currentTime)
break;
// remove executing thread from the queue
sleepingThreadIDs.pop();
// wake up the thread and tick it (if not dead)
// this can quite possibly re-add the thread to <sleepingThreadIDs>
// again, but any thread is guaranteed to sleep for at least 1 tick
switch (zzzThread->GetState()) {
case CCobThread::Sleep: {
zzzThread->SetState(CCobThread::Run);
TickThread(zzzThread);
} break;
case CCobThread::Dead: {
RemoveThread(zzzThread->GetID());
} break;
default: {
LOG_L(L_ERROR, "[COBEngine::%s] unknown state %d for thread %d", __func__, zzzThread->GetState(), zzzThread->GetID());
} break;
}
}
}
void CCobEngine::Tick(int deltaTime)
{
currentTime += deltaTime;
TickRunningThreads();
AddQueuedThreads();
WakeSleepingThreads();
AddQueuedThreads();
}
void CCobEngine::ShowScriptError(const std::string& msg)
{
if (curThread != nullptr) {
curThread->ShowError(msg.c_str());
return;
}
LOG_L(L_ERROR, "[COBEngine::%s] \"%s\" outside script execution", __func__, msg.c_str());
}
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