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evdev: set flag in a thread-safe way

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This commit is contained in:
Tillmann Karras
2016-12-05 00:37:36 +00:00
parent 3c090a37d4
commit f575902cf3
1 changed files with 11 additions and 9 deletions
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12
Source/Core/InputCommon/ControllerInterface/evdev/evdev.cpp
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@ -116,26 +116,28 @@ static void HotplugThreadFunc()
static void StartHotplugThread() static void StartHotplugThread()
{ {
if (s_hotplug_thread_running.IsSet()) // Mark the thread as running.
if (!s_hotplug_thread_running.TestAndSet())
// It was already running.
return; return;
s_wakeup_eventfd = eventfd(0, 0); s_wakeup_eventfd = eventfd(0, 0);
_assert_msg_(PAD, s_wakeup_eventfd != -1, "Couldn't create eventfd."); _assert_msg_(PAD, s_wakeup_eventfd != -1, "Couldn't create eventfd.");
s_hotplug_thread_running.Set(true);
s_hotplug_thread = std::thread(HotplugThreadFunc); s_hotplug_thread = std::thread(HotplugThreadFunc);
} }
static void StopHotplugThread() static void StopHotplugThread()
{ {
if (s_hotplug_thread_running.TestAndClear()) // Tell the hotplug thread to stop.
{ if (!s_hotplug_thread_running.TestAndClear())
// It wasn't running, we're done.
return;
// Write something to efd so that select() stops blocking. // Write something to efd so that select() stops blocking.
uint64_t value = 1; uint64_t value = 1;
if (write(s_wakeup_eventfd, &value, sizeof(uint64_t)) < 0) if (write(s_wakeup_eventfd, &value, sizeof(uint64_t)) < 0)
{ {
} }
s_hotplug_thread.join(); s_hotplug_thread.join();
}
} }
void Init() void Init()