1/*
2 * libusbx synchronization using POSIX Threads
3 *
4 * Copyright © 2011 Vitali Lovich <vlovich@aliph.com>
5 * Copyright © 2011 Peter Stuge <peter@stuge.se>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#if defined(__linux__) || defined(__OpenBSD__)
23# include <unistd.h>
24# include <sys/syscall.h>
25#elif defined(__APPLE__)
26# include <mach/mach.h>
27#elif defined(__CYGWIN__)
28# include <windows.h>
29#endif
30
31#include "threads_posix.h"
32
33int usbi_mutex_init_recursive(pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
34{
35	int err;
36	pthread_mutexattr_t stack_attr;
37	if (!attr) {
38		attr = &stack_attr;
39		err = pthread_mutexattr_init(&stack_attr);
40		if (err != 0)
41			return err;
42	}
43
44	/* mutexattr_settype requires _GNU_SOURCE or _XOPEN_SOURCE >= 500 on Linux */
45	err = pthread_mutexattr_settype(attr, PTHREAD_MUTEX_RECURSIVE);
46	if (err != 0)
47		goto finish;
48
49	err = pthread_mutex_init(mutex, attr);
50
51finish:
52	if (attr == &stack_attr)
53		pthread_mutexattr_destroy(&stack_attr);
54
55	return err;
56}
57
58int usbi_get_tid(void)
59{
60	int ret = -1;
61#if defined(__ANDROID__)
62	ret = gettid();
63#elif defined(__linux__)
64	ret = syscall(SYS_gettid);
65#elif defined(__OpenBSD__)
66	/* The following only works with OpenBSD > 5.1 as it requires
67	   real thread support. For 5.1 and earlier, -1 is returned. */
68	ret = syscall(SYS_getthrid);
69#elif defined(__APPLE__)
70	ret = mach_thread_self();
71	mach_port_deallocate(mach_task_self(), ret);
72#elif defined(__CYGWIN__)
73	ret = GetCurrentThreadId();
74#endif
75/* TODO: NetBSD thread ID support */
76	return ret;
77}
78