2 * libusb synchronization using POSIX Threads
4 * Copyright © 2011 Vitali Lovich <vlovich@aliph.com>
5 * Copyright © 2011 Peter Stuge <peter@stuge.se>
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.
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.
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
25 #if defined(__linux__) || defined(__OpenBSD__)
26 # if defined(__OpenBSD__)
30 # include <sys/syscall.h>
31 #elif defined(__APPLE__)
32 # include <mach/mach.h>
33 #elif defined(__CYGWIN__)
37 #include "threads_posix.h"
40 int usbi_mutex_init_recursive(pthread_mutex_t *mutex)
43 pthread_mutexattr_t attr;
45 err = pthread_mutexattr_init(&attr);
49 /* mutexattr_settype requires _GNU_SOURCE or _XOPEN_SOURCE >= 500 on Linux */
50 err = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
54 err = pthread_mutex_init(mutex, &attr);
57 pthread_mutexattr_destroy(&attr);
62 int usbi_cond_timedwait(pthread_cond_t *cond,
63 pthread_mutex_t *mutex, const struct timeval *tv)
65 struct timespec timeout;
68 r = usbi_backend->clock_gettime(USBI_CLOCK_REALTIME, &timeout);
72 timeout.tv_sec += tv->tv_sec;
73 timeout.tv_nsec += tv->tv_usec * 1000;
74 while (timeout.tv_nsec >= 1000000000L) {
75 timeout.tv_nsec -= 1000000000L;
79 return pthread_cond_timedwait(cond, mutex, &timeout);
82 int usbi_get_tid(void)
85 #if defined(__ANDROID__)
87 #elif defined(__linux__)
88 ret = syscall(SYS_gettid);
89 #elif defined(__OpenBSD__)
90 /* The following only works with OpenBSD > 5.1 as it requires
91 real thread support. For 5.1 and earlier, -1 is returned. */
92 ret = syscall(SYS_getthrid);
93 #elif defined(__APPLE__)
94 ret = mach_thread_self();
95 mach_port_deallocate(mach_task_self(), ret);
96 #elif defined(__CYGWIN__)
97 ret = GetCurrentThreadId();
99 /* TODO: NetBSD thread ID support */