Adding use_system_libusb option for third_party/libusb

third_party/libusb/libusb/os/threads_posix.c

-/*
- * libusb synchronization using POSIX Threads
- *
- * Copyright (C) 2011 Vitali Lovich <vlovich@aliph.com>
- * Copyright (C) 2011 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
- */
-
-#ifdef _XOPEN_SOURCE
-# if _XOPEN_SOURCE < 500
-#  undef _XOPEN_SOURCE
-#  define _XOPEN_SOURCE 500
-# endif
-#else
-#define _XOPEN_SOURCE 500
-#endif /* _XOPEN_SOURCE */
-
-#include <pthread.h>
-
-int usbi_mutex_init_recursive(pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
-{
-        int err;
-        pthread_mutexattr_t stack_attr;
-        if (!attr) {
-                attr = &stack_attr;
-                err = pthread_mutexattr_init(&stack_attr);
-                if (err != 0)
-                        return err;
-        }
-
-        err = pthread_mutexattr_settype(attr, PTHREAD_MUTEX_RECURSIVE);
-        if (err != 0)
-                goto finish;
-
-        err = pthread_mutex_init(mutex, attr);
-
-finish:
-        if (attr == &stack_attr)
-                pthread_mutexattr_destroy(&stack_attr);
-
-        return err;
-}