core: kill process if threads are in a deadlock

src/core/PortalManager.cpp

@@ -11,6 +11,7 @@
 #include <sys/poll.h>
 #include <sys/mman.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #include <thread>
 
@@ -242,6 +243,8 @@ void CPortalManager::onGlobalRemoved(void* data, struct wl_registry* registry, u
 }
 
 void CPortalManager::init() {
+    m_iPID = getpid();
+
     try {
         m_pConnection = sdbus::createDefaultBusConnection("org.freedesktop.impl.portal.desktop.hyprland");
     } catch (std::exception& e) {
@@ -517,6 +520,11 @@ void CPortalManager::addTimer(const CTimer& timer) {
 void CPortalManager::terminate() {
     m_bTerminate = true;
 
+    // if we don't exit in 5s, we'll kill by force. Nuclear option. PIDs are not reused in linux until a wrap-around,
+    // and I doubt anyone will make 4.2M PIDs within 5s.
+    if (fork() == 0)
+        execl("/bin/sh", "/bin/sh", "-c", std::format("sleep 5 && kill -9 {}", m_iPID).c_str());
+
     {
         m_sEventLoopInternals.shouldProcess = true;
         m_sEventLoopInternals.loopSignal.notify_all();

src/core/PortalManager.hpp

@@ -78,6 +78,7 @@ class CPortalManager {
     void  startEventLoop();
 
     bool  m_bTerminate = false;
+    pid_t m_iPID       = 0;
 
     struct {
         std::condition_variable loopSignal;