1 /* 2 * libusb synchronization using POSIX Threads 3 * 4 * Copyright 2011 Vitali Lovich <vlovich (at) aliph.com> 5 * Copyright 2011 Peter Stuge <peter (at) 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 #include <config.h> 23 24 #include <time.h> 25 #if defined(__linux__) || defined(__OpenBSD__) 26 # if defined(__OpenBSD__) 27 # define _BSD_SOURCE 28 # endif 29 # include <unistd.h> 30 # include <sys/syscall.h> 31 #elif defined(__APPLE__) 32 # include <mach/mach.h> 33 #elif defined(__CYGWIN__) 34 # include <windows.h> 35 #endif 36 37 #include "threads_posix.h" 38 #include "libusbi.h" 39 40 int usbi_cond_timedwait(pthread_cond_t *cond, 41 pthread_mutex_t *mutex, const struct timeval *tv) 42 { 43 struct timespec timeout; 44 int r; 45 46 r = usbi_backend->clock_gettime(USBI_CLOCK_REALTIME, &timeout); 47 if (r < 0) 48 return r; 49 50 timeout.tv_sec += tv->tv_sec; 51 timeout.tv_nsec += tv->tv_usec * 1000; 52 while (timeout.tv_nsec >= 1000000000L) { 53 timeout.tv_nsec -= 1000000000L; 54 timeout.tv_sec++; 55 } 56 57 return pthread_cond_timedwait(cond, mutex, &timeout); 58 } 59 60 int usbi_get_tid(void) 61 { 62 int ret = -1; 63 #if defined(__ANDROID__) 64 ret = gettid(); 65 #elif defined(__linux__) 66 ret = syscall(SYS_gettid); 67 #elif defined(__OpenBSD__) 68 /* The following only works with OpenBSD > 5.1 as it requires 69 real thread support. For 5.1 and earlier, -1 is returned. */ 70 ret = syscall(SYS_getthrid); 71 #elif defined(__APPLE__) 72 ret = mach_thread_self(); 73 mach_port_deallocate(mach_task_self(), ret); 74 #elif defined(__CYGWIN__) 75 ret = GetCurrentThreadId(); 76 #endif 77 /* TODO: NetBSD thread ID support */ 78 return ret; 79 } 80
