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Set process affinity on Windows #8

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Merged
redstrate merged 1 commit into from
May 28, 2026
Merged

Set process affinity on Windows #8

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21 changes: 21 additions & 0 deletions launcher/src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,11 @@

#ifdef Q_OS_WINDOWS
#include <QStyleFactory>

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#include "umbra_log.h"
#endif

#include "umbra-version.h"
Expand All @@ -24,6 +29,22 @@ using namespace Qt::StringLiterals;

int main(int argc, char *argv[])
{
// Restrict to first 14 threads on Windows as the game will crash when running on 16 or more threads.
// This is handled via taskset on Linux, but on Windows that doesn't exist. If we set our own affinity, that's then passed to our children.
#if defined(Q_OS_WIN)
HANDLE hProcess = GetCurrentProcess();

unsigned long lProcessAffinityMask = 0;
unsigned long lSystemAffinityMask = 0;
GetProcessAffinityMask(hProcess, reinterpret_cast<PDWORD_PTR>(&lProcessAffinityMask), reinterpret_cast<PDWORD_PTR>(&lSystemAffinityMask));

lProcessAffinityMask &= 0x3FFF;

if (!SetProcessAffinityMask(hProcess, lProcessAffinityMask)) {
qCWarning(UMBRA_LOG) << "Could not set process affinity, the game will NOT launch correctly on certain systems!";
}
#endif

KIconTheme::initTheme(); // TODO: KirigamiApp doesn't call this before app construction so it doesn't work on Windows

KirigamiApp::App app(argc, argv);
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