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Core/TaskScheduler: Fix WaitForTasks returning before all tasks are executed 

This could happen because a worker only counts as active when starting a job, but after acquiring one.

So one possibility was that :
1. All workers except W1 and W2 are idle
2. W1 is about to notify as idle, as W2 got a task (but did not notify as active yet)
3. W1 notifies as idle, idle count == worker count -> wake main thread
4. W2 didn't run its task yet
This commit is contained in:
SirLynix 2024-02-03 14:41:10 +01:00
parent 653e56f8ce
commit 8b9b47ba59
1 changed files with 3 additions and 12 deletions
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15
src/Nazara/Core/TaskScheduler.cpp
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@ -130,7 +130,6 @@ namespace Nz
std::shuffle(randomWorkerIndices.begin(), randomWorkerIndices.end(), gen);
}
bool idle = false;
do
{
// Get a task
@ -152,12 +151,6 @@ namespace Nz
if (task)
{
if (idle)
{
m_owner.NotifyWorkerActive();
idle = false;
}
#ifdef NAZARA_WITH_TSAN
// Workaround for TSan false-positive
__tsan_acquire(task);
@ -173,14 +166,12 @@ namespace Nz
else
{
// Wait for tasks if we don't have any right now
if (!idle)
{
m_owner.NotifyWorkerIdle();
idle = true;
}
m_owner.NotifyWorkerIdle();
m_notifier.wait(false);
m_notifier.clear();
m_owner.NotifyWorkerActive();
}
}
while (m_running.load(std::memory_order_relaxed));