| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| |
| /* Barrier implementation because Android/Bionic don't have pthread_barrier. |
| This implementation came from Brent Priddy and was posted on |
| StackOverflow. It is used with his permission. */ |
| |
| typedef struct _SDL_ThreadBarrier |
| { |
| SDL_Mutex *mutex; |
| SDL_Condition *cond; |
| Uint32 count; |
| Uint32 trip_count; |
| } SDL_ThreadBarrier; |
| |
| static int SDL_CreateThreadBarrier(SDL_ThreadBarrier *barrier, Uint32 count) |
| { |
| SDL_assert(barrier != NULL); |
| SDL_assert(count != 0); |
| |
| barrier->mutex = SDL_CreateMutex(); |
| if (barrier->mutex == NULL) { |
| return -1; /* Error set by CreateMutex */ |
| } |
| barrier->cond = SDL_CreateCondition(); |
| if (barrier->cond == NULL) { |
| return -1; /* Error set by CreateCond */ |
| } |
| |
| barrier->trip_count = count; |
| barrier->count = 0; |
| |
| return 0; |
| } |
| |
| static void SDL_DestroyThreadBarrier(SDL_ThreadBarrier *barrier) |
| { |
| SDL_DestroyCondition(barrier->cond); |
| SDL_DestroyMutex(barrier->mutex); |
| } |
| |
| static int SDL_WaitThreadBarrier(SDL_ThreadBarrier *barrier) |
| { |
| SDL_LockMutex(barrier->mutex); |
| barrier->count += 1; |
| if (barrier->count >= barrier->trip_count) { |
| barrier->count = 0; |
| SDL_BroadcastCondition(barrier->cond); |
| SDL_UnlockMutex(barrier->mutex); |
| return 1; |
| } |
| SDL_WaitCondition(barrier->cond, barrier->mutex); |
| SDL_UnlockMutex(barrier->mutex); |
| return 0; |
| } |
| |
| #include "../../thread/SDL_systhread.h" |
| |
| #define HIDAPI_THREAD_TIMED_OUT SDL_MUTEX_TIMEDOUT |
| |
| typedef Uint64 hidapi_timespec; |
| |
| typedef struct |
| { |
| SDL_Thread *thread; |
| SDL_Mutex *mutex; /* Protects input_reports */ |
| SDL_Condition *condition; |
| SDL_ThreadBarrier barrier; /* Ensures correct startup sequence */ |
| |
| } hidapi_thread_state; |
| |
| static void hidapi_thread_state_init(hidapi_thread_state *state) |
| { |
| state->mutex = SDL_CreateMutex(); |
| state->condition = SDL_CreateCondition(); |
| SDL_CreateThreadBarrier(&state->barrier, 2); |
| } |
| |
| static void hidapi_thread_state_destroy(hidapi_thread_state *state) |
| { |
| SDL_DestroyThreadBarrier(&state->barrier); |
| SDL_DestroyCondition(state->condition); |
| SDL_DestroyMutex(state->mutex); |
| } |
| |
| static void hidapi_thread_cleanup_push(void (*routine)(void *), void *arg) |
| { |
| /* There isn't an equivalent in SDL, and it's only useful for threads calling hid_read_timeout() */ |
| } |
| |
| static void hidapi_thread_cleanup_pop(int execute) |
| { |
| } |
| |
| static void hidapi_thread_mutex_lock(hidapi_thread_state *state) |
| { |
| SDL_LockMutex(state->mutex); |
| } |
| |
| static void hidapi_thread_mutex_unlock(hidapi_thread_state *state) |
| { |
| SDL_UnlockMutex(state->mutex); |
| } |
| |
| static void hidapi_thread_cond_wait(hidapi_thread_state *state) |
| { |
| SDL_WaitCondition(state->condition, state->mutex); |
| } |
| |
| static int hidapi_thread_cond_timedwait(hidapi_thread_state *state, hidapi_timespec *ts) |
| { |
| Sint64 timeout_ns; |
| Sint32 timeout_ms; |
| |
| timeout_ns = (Sint64)(*ts - SDL_GetTicksNS()); |
| if (timeout_ns <= 0) { |
| timeout_ms = 0; |
| } else { |
| timeout_ms = (Sint32)SDL_NS_TO_MS(timeout_ns); |
| } |
| return SDL_WaitConditionTimeout(state->condition, state->mutex, timeout_ms); |
| } |
| |
| static void hidapi_thread_cond_signal(hidapi_thread_state *state) |
| { |
| SDL_SignalCondition(state->condition); |
| } |
| |
| static void hidapi_thread_cond_broadcast(hidapi_thread_state *state) |
| { |
| SDL_BroadcastCondition(state->condition); |
| } |
| |
| static void hidapi_thread_barrier_wait(hidapi_thread_state *state) |
| { |
| SDL_WaitThreadBarrier(&state->barrier); |
| } |
| |
| typedef struct |
| { |
| void *(*func)(void*); |
| void *func_arg; |
| |
| } RunInputThreadParam; |
| |
| static int RunInputThread(void *param) |
| { |
| RunInputThreadParam *data = (RunInputThreadParam *)param; |
| void *(*func)(void*) = data->func; |
| void *func_arg = data->func_arg; |
| SDL_free(data); |
| func(func_arg); |
| return 0; |
| } |
| |
| static void hidapi_thread_create(hidapi_thread_state *state, void *(*func)(void*), void *func_arg) |
| { |
| RunInputThreadParam *param = (RunInputThreadParam *)malloc(sizeof(*param)); |
| /* Note that the hidapi code didn't check for thread creation failure. |
| * We'll crash if malloc() fails |
| */ |
| param->func = func; |
| param->func_arg = func_arg; |
| state->thread = SDL_CreateThreadInternal(RunInputThread, "libusb", 0, param); |
| } |
| |
| static void hidapi_thread_join(hidapi_thread_state *state) |
| { |
| SDL_WaitThread(state->thread, NULL); |
| } |
| |
| static void hidapi_thread_gettime(hidapi_timespec *ts) |
| { |
| *ts = SDL_GetTicksNS(); |
| } |
| |
| static void hidapi_thread_addtime(hidapi_timespec *ts, int milliseconds) |
| { |
| *ts += SDL_MS_TO_NS(milliseconds); |
| } |