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WinRT: prevented a potential race condition in the XInput backend

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The race condition could've been triggered on device removal.
This commit is contained in:
David Ludwig 2013-12-25 14:42:38 -05:00
parent 8db33416a2
commit ca867fc92d
1 changed files with 4 additions and 2 deletions
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6
src/joystick/winrt/SDL_xinputjoystick.c
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@ -106,25 +106,27 @@ DeviceDetectionThreadMain(void * _data)
*/
/* See if any new devices are connected. */
SDL_LockMutex(g_DeviceInfoLock);
for (i = 0; i < XUSER_MAX_COUNT; ++i) {
if (!g_XInputData[i].isDeviceConnected &&
!g_XInputData[i].isDeviceConnectionEventPending &&
!g_XInputData[i].isDeviceRemovalEventPending)
{
SDL_UnlockMutex(g_DeviceInfoLock);
result = XInputGetCapabilities(i, 0, &tempXInputCaps);
SDL_LockMutex(g_DeviceInfoLock);
if (result == ERROR_SUCCESS) {
/* Yes, a device is connected. Mark it as such.
Others will be told about this (via an
SDL_JOYDEVICEADDED event) in the next call to
SDL_SYS_JoystickDetect.
*/
SDL_LockMutex(g_DeviceInfoLock);
g_XInputData[i].isDeviceConnected = SDL_TRUE;
g_XInputData[i].isDeviceConnectionEventPending = SDL_TRUE;
SDL_UnlockMutex(g_DeviceInfoLock);
}
}
}
SDL_UnlockMutex(g_DeviceInfoLock);
}
return 0;