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Improved sensor thread-safety

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This fixes an issue where the main thread would hang indefinitely when polling events if sensors were initialized and shutdown on another thread.
This commit is contained in:
Sam Lantinga
2023-08-08 22:08:40 -07:00
parent 4ee0e5a984
commit 6b93e788fa
4 changed files with 204 additions and 112 deletions
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17
src/sensor/SDL_sensor_c.h
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@@ -23,6 +23,10 @@
#ifndef SDL_sensor_c_h_
#define SDL_sensor_c_h_
#ifdef SDL_THREAD_SAFETY_ANALYSIS
extern SDL_Mutex *SDL_sensor_lock;
#endif
struct SDL_SensorDriver;
/* Useful functions and variables from SDL_sensor.c */
@@ -34,8 +38,17 @@ extern SDL_SensorID SDL_GetNextSensorInstanceID(void);
extern int SDL_InitSensors(void);
extern void SDL_QuitSensors(void);
extern void SDL_LockSensors(void);
extern void SDL_UnlockSensors(void);
/* Return whether the sensor system is currently initialized */
extern SDL_bool SDL_SensorsInitialized(void);
/* Return whether the sensors are currently locked */
extern SDL_bool SDL_SensorsLocked(void);
/* Make sure we currently have the sensors locked */
extern void SDL_AssertSensorsLocked(void) SDL_ASSERT_CAPABILITY(SDL_sensor_lock);
extern void SDL_LockSensors(void) SDL_ACQUIRE(SDL_sensor_lock);
extern void SDL_UnlockSensors(void) SDL_RELEASE(SDL_sensor_lock);
/* Function to return whether there are any sensors opened by the application */
extern SDL_bool SDL_SensorsOpened(void);