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[Linux/Threading] Self-suspend with condition variable instead of spin

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This commit is contained in:
Herman S.
2025-12-25 12:08:05 +09:00
parent 9f8961c185
commit f45a254774
3 changed files with 51 additions and 21 deletions
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16
src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
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@@ -245,27 +245,17 @@ dword_result_t NtSuspendThread_entry(dword_t handle,
return X_STATUS_THREAD_IS_TERMINATING;
}
#elif XE_PLATFORM_LINUX
// On Linux, we need to handle self-suspension specially to avoid deadlock
// Handle self-suspension specially to avoid deadlock.
if (!thread->guest_object<X_KTHREAD>()->terminated) {
bool is_self_suspend =
(current_pcr->prcb_data.current_thread == thread->guest_object());
if (is_self_suspend) {
// Self-suspension: increment the suspend count and wait until
// another thread resumes us (decrements count to 0)
auto guest_thread = thread->guest_object<X_KTHREAD>();
suspend_count = guest_thread->suspend_count;
guest_thread->suspend_count++;
XELOGD("Thread {:X} self-suspending", thread->handle());
suspend_count = thread->SelfSuspend();
result = X_STATUS_SUCCESS;
XELOGD("Thread {:X} self-suspending (count: {}) - waiting for resume",
thread->handle(), guest_thread->suspend_count);
// Wait until suspend_count reaches 0 (resumed by another thread)
while (guest_thread->suspend_count > 0) {
xe::threading::Sleep(std::chrono::microseconds(100));
}
XELOGD("Thread {:X} resumed", thread->handle());
} else {
// Normal suspension of another thread
result = thread->Suspend(&suspend_count);
}
} else {