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Remove atomics from keyboard_uhid 

The UHID output callback is now called from the same (main) thread as
the process_key() function.

PR #5270 <https://github.com/Genymobile/scrcpy/pull/5270>
This commit is contained in:
Romain Vimont 2024-09-06 23:08:08 +02:00
parent cbf5db85c1
commit a84b0dfd0c
2 changed files with 10 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
app/src/uhid/keyboard_uhid.c
View File

@ -31,16 +31,13 @@ static void
sc_keyboard_uhid_synchronize_mod(struct sc_keyboard_uhid *kb) {
SDL_Keymod sdl_mod = SDL_GetModState();
uint16_t mod = sc_mods_state_from_sdl(sdl_mod) & (SC_MOD_CAPS | SC_MOD_NUM);
uint16_t device_mod =
atomic_load_explicit(&kb->device_mod, memory_order_relaxed);
uint16_t diff = mod ^ device_mod;
uint16_t diff = mod ^ kb->device_mod;
if (diff) {
// Inherently racy (the HID output reports arrive asynchronously in
// response to key presses), but will re-synchronize on next key press
// or HID output anyway
atomic_store_explicit(&kb->device_mod, mod, memory_order_relaxed);
kb->device_mod = mod;
struct sc_hid_event hid_event;
if (!sc_hid_keyboard_event_from_mods(&hid_event, diff)) {
@ -59,6 +56,8 @@ sc_key_processor_process_key(struct sc_key_processor *kp,
uint64_t ack_to_wait) {
(void) ack_to_wait;
assert(sc_thread_get_id() == SC_MAIN_THREAD_ID);
if (event->repeat) {
// In USB HID protocol, key repeat is handled by the host (Android), so
// just ignore key repeat here.
@ -72,11 +71,9 @@ sc_key_processor_process_key(struct sc_key_processor *kp,
// Not all keys are supported, just ignore unsupported keys
if (sc_hid_keyboard_event_from_key(&kb->hid, &hid_event, event)) {
if (event->scancode == SC_SCANCODE_CAPSLOCK) {
atomic_fetch_xor_explicit(&kb->device_mod, SC_MOD_CAPS,
memory_order_relaxed);
kb->device_mod ^= SC_MOD_CAPS;
} else if (event->scancode == SC_SCANCODE_NUMLOCK) {
atomic_fetch_xor_explicit(&kb->device_mod, SC_MOD_NUM,
memory_order_relaxed);
kb->device_mod ^= SC_MOD_NUM;
} else {
// Synchronize modifiers (only if the scancode itself does not
// change the modifiers)
@ -103,7 +100,7 @@ sc_keyboard_uhid_to_sc_mod(uint8_t hid_led) {
static void
sc_uhid_receiver_process_output(struct sc_uhid_receiver *receiver,
const uint8_t *data, size_t len) {
// Called from the thread receiving device messages
assert(sc_thread_get_id() == SC_MAIN_THREAD_ID);
assert(len);
@ -117,7 +114,7 @@ sc_uhid_receiver_process_output(struct sc_uhid_receiver *receiver,
uint8_t hid_led = data[0];
uint16_t device_mod = sc_keyboard_uhid_to_sc_mod(hid_led);
atomic_store_explicit(&kb->device_mod, device_mod, memory_order_relaxed);
kb->device_mod = device_mod;
}
bool
@ -127,7 +124,7 @@ sc_keyboard_uhid_init(struct sc_keyboard_uhid *kb,
sc_hid_keyboard_init(&kb->hid);
kb->controller = controller;
atomic_init(&kb->device_mod, 0);
kb->device_mod = 0;
static const struct sc_key_processor_ops ops = {
.process_key = sc_key_processor_process_key,

2
app/src/uhid/keyboard_uhid.h
View File

@ -16,7 +16,7 @@ struct sc_keyboard_uhid {
struct sc_hid_keyboard hid;
struct sc_controller *controller;
atomic_uint_least16_t device_mod;
uint16_t device_mod;
};
bool