Import libusb 1.0.9-rc3 into third_party

third_party/libusb/libusb/os/threads_posix.h

Index: third_party/libusb/libusb/os/threads_posix.h
diff --git a/third_party/libusb/libusb/os/threads_posix.h b/third_party/libusb/libusb/os/threads_posix.h
new file mode 100644
index 0000000000000000000000000000000000000000..97522089369ba69a922e6520fc5af9b697916a43
--- /dev/null
+++ b/third_party/libusb/libusb/os/threads_posix.h
@@ -0,0 +1,48 @@
+/*
+ * libusb synchronization using POSIX Threads
+ *
+ * Copyright (C) 2010 Peter Stuge <peter@stuge.se>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LIBUSB_THREADS_POSIX_H
+#define LIBUSB_THREADS_POSIX_H
+
+#include <pthread.h>
+
+#define usbi_mutex_static_t		pthread_mutex_t
+#define USBI_MUTEX_INITIALIZER		PTHREAD_MUTEX_INITIALIZER
+#define usbi_mutex_static_lock		pthread_mutex_lock
+#define usbi_mutex_static_unlock	pthread_mutex_unlock
+
+#define usbi_mutex_t			pthread_mutex_t
+#define usbi_mutex_init			pthread_mutex_init
+#define usbi_mutex_lock			pthread_mutex_lock
+#define usbi_mutex_unlock		pthread_mutex_unlock
+#define usbi_mutex_trylock		pthread_mutex_trylock
+#define usbi_mutex_destroy		pthread_mutex_destroy
+
+#define usbi_cond_t			pthread_cond_t
+#define usbi_cond_init			pthread_cond_init
+#define usbi_cond_wait			pthread_cond_wait
+#define usbi_cond_timedwait		pthread_cond_timedwait
+#define usbi_cond_broadcast		pthread_cond_broadcast
+#define usbi_cond_destroy		pthread_cond_destroy
+#define usbi_cond_signal		pthread_cond_signal
+
+extern int usbi_mutex_init_recursive(pthread_mutex_t *mutex, pthread_mutexattr_t *attr);
+
+#endif /* LIBUSB_THREADS_POSIX_H */