Updated with upstream suggestions in https://github.com/libusb/hidapi/pull/582

src/hidapi/libusb/hidapi_thread_pthread.h

@@ -0,0 +1,163 @@
+/*******************************************************
+ HIDAPI - Multi-Platform library for
+ communication with HID devices.
+
+ Alan Ott
+ Signal 11 Software
+
+ libusb/hidapi Team
+
+ Copyright 2022, All Rights Reserved.
+
+ At the discretion of the user of this library,
+ this software may be licensed under the terms of the
+ GNU General Public License v3, a BSD-Style license, or the
+ original HIDAPI license as outlined in the LICENSE.txt,
+ LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
+ files located at the root of the source distribution.
+ These files may also be found in the public source
+ code repository located at:
+        https://github.com/libusb/hidapi .
+********************************************************/
+
+#include <pthread.h>
+
+#if defined(__ANDROID__) && __ANDROID_API__ < __ANDROID_API_N__
+
+/* 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 int pthread_barrierattr_t;
+typedef struct pthread_barrier {
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    int count;
+    int trip_count;
+} pthread_barrier_t;
+
+static int pthread_barrier_init(pthread_barrier_t *barrier, const pthread_barrierattr_t *attr, unsigned int count)
+{
+	if(count == 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if(pthread_mutex_init(&barrier->mutex, 0) < 0) {
+		return -1;
+	}
+	if(pthread_cond_init(&barrier->cond, 0) < 0) {
+		pthread_mutex_destroy(&barrier->mutex);
+		return -1;
+	}
+	barrier->trip_count = count;
+	barrier->count = 0;
+
+	return 0;
+}
+
+static int pthread_barrier_destroy(pthread_barrier_t *barrier)
+{
+	pthread_cond_destroy(&barrier->cond);
+	pthread_mutex_destroy(&barrier->mutex);
+	return 0;
+}
+
+static int pthread_barrier_wait(pthread_barrier_t *barrier)
+{
+	pthread_mutex_lock(&barrier->mutex);
+	++(barrier->count);
+	if(barrier->count >= barrier->trip_count)
+	{
+		barrier->count = 0;
+		pthread_cond_broadcast(&barrier->cond);
+		pthread_mutex_unlock(&barrier->mutex);
+		return 1;
+	}
+	else
+	{
+		pthread_cond_wait(&barrier->cond, &(barrier->mutex));
+		pthread_mutex_unlock(&barrier->mutex);
+		return 0;
+	}
+}
+
+#endif
+
+#define HIDAPI_THREAD_TIMED_OUT	ETIMEDOUT
+
+typedef struct
+{
+	pthread_t thread;
+	pthread_mutex_t mutex; /* Protects input_reports */
+	pthread_cond_t condition;
+	pthread_barrier_t barrier; /* Ensures correct startup sequence */
+
+} hidapi_thread_state;
+
+static void hidapi_thread_state_init(hidapi_thread_state *state)
+{
+	pthread_mutex_init(&state->mutex, NULL);
+	pthread_cond_init(&state->condition, NULL);
+	pthread_barrier_init(&state->barrier, NULL, 2);
+}
+
+static void hidapi_thread_state_destroy(hidapi_thread_state *state)
+{
+	pthread_barrier_destroy(&state->barrier);
+	pthread_cond_destroy(&state->condition);
+	pthread_mutex_destroy(&state->mutex);
+}
+
+#define hidapi_thread_cleanup_push	pthread_cleanup_push
+#define hidapi_thread_cleanup_pop	pthread_cleanup_pop
+
+static void hidapi_thread_mutex_lock(hidapi_thread_state *state)
+{
+	pthread_mutex_lock(&state->mutex);
+}
+
+static void hidapi_thread_mutex_unlock(hidapi_thread_state *state)
+{
+	pthread_mutex_unlock(&state->mutex);
+}
+
+static void hidapi_thread_cond_wait(hidapi_thread_state *state)
+{
+	pthread_cond_wait(&state->condition, &state->mutex);
+}
+
+static int hidapi_thread_cond_timedwait(hidapi_thread_state *state, struct timespec *ts)
+{
+	return pthread_cond_timedwait(&state->condition, &state->mutex, ts);
+}
+
+static void hidapi_thread_cond_signal(hidapi_thread_state *state)
+{
+	pthread_cond_signal(&state->condition);
+}
+
+static void hidapi_thread_cond_broadcast(hidapi_thread_state *state)
+{
+	pthread_cond_broadcast(&state->condition);
+}
+
+static void hidapi_thread_barrier_wait(hidapi_thread_state *state)
+{
+	pthread_barrier_wait(&state->barrier);
+}
+
+static void hidapi_thread_create(hidapi_thread_state *state, void *(*func)(void*), void *func_arg)
+{
+	pthread_create(&state->thread, NULL, func, func_arg);
+}
+
+static void hidapi_thread_join(hidapi_thread_state *state)
+{
+	pthread_join(state->thread, NULL);
+}
+
+static void hidapi_thread_gettime(struct timespec *ts)
+{
+	clock_gettime(CLOCK_REALTIME, ts);
+}
+