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"
39 int usbi_mutex_init_recursive(pthread_mutex_t *mutex)
42 pthread_mutexattr_t attr;
44 err = pthread_mutexattr_init(&attr);
48 /* mutexattr_settype requires _GNU_SOURCE or _XOPEN_SOURCE >= 500 on Linux */
49 err = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
53 err = pthread_mutex_init(mutex, &attr);
56 pthread_mutexattr_destroy(&attr);
61 int usbi_cond_timedwait(pthread_cond_t *cond,
62 pthread_mutex_t *mutex, const struct timeval *tv)
64 struct timespec timeout;
67 r = clock_gettime(CLOCK_REALTIME, &timeout);
71 timeout.tv_sec += tv->tv_sec;
72 timeout.tv_nsec += tv->tv_usec * 1000;
73 while (timeout.tv_nsec >= 1000000000L) {
74 timeout.tv_nsec -= 1000000000L;
78 return pthread_cond_timedwait(cond, mutex, &timeout);
81 int usbi_get_tid(void)
84 #if defined(__ANDROID__)
86 #elif defined(__linux__)
87 ret = syscall(SYS_gettid);
88 #elif defined(__OpenBSD__)
89 /* The following only works with OpenBSD > 5.1 as it requires
90 real thread support. For 5.1 and earlier, -1 is returned. */
91 ret = syscall(SYS_getthrid);
92 #elif defined(__APPLE__)
93 ret = mach_thread_self();
94 mach_port_deallocate(mach_task_self(), ret);
95 #elif defined(__CYGWIN__)
96 ret = GetCurrentThreadId();
98 /* TODO: NetBSD thread ID support */