--- /dev/null
+/*
+ * libusb synchronization using POSIX Threads
+ *
+ * Copyright © 2011 Vitali Lovich <vlovich@aliph.com>
+ * Copyright © 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
+ */
+
+#if defined(__linux__) || defined(__OpenBSD__)
+# if defined(__linux__)
+# define _GNU_SOURCE
+# else
+# define _BSD_SOURCE
+# endif
+# include <unistd.h>
+# include <sys/syscall.h>
+#elif defined(__APPLE__)
+# include <mach/mach.h>
+#elif defined(__CYGWIN__)
+# include <windows.h>
+#endif
+
+#include "threads_posix.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;
+ }
+
+ /* mutexattr_settype requires _GNU_SOURCE or _XOPEN_SOURCE >= 500 on Linux */
+ 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;
+}
+
+int usbi_get_tid(void) {
+ int ret = -1;
+#if defined(__ANDROID__)
+ ret = gettid();
+#elif defined(__linux__)
+ ret = syscall(SYS_gettid);
+#elif defined(__OpenBSD__)
+ /* The following only works with OpenBSD > 5.1 as it requires
+ real thread support. For 5.1 and earlier, -1 is returned. */
+ ret = syscall(SYS_getthrid);
+#elif defined(__APPLE__)
+ ret = mach_thread_self();
+ mach_port_deallocate(mach_task_self(), ret);
+#elif defined(__CYGWIN__)
+ ret = GetCurrentThreadId();
+#endif
+ /* TODO: NetBSD thread ID support */
+ return ret;
+}