1 /* 2 * libusbx 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 #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 33 int 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 51 finish: 52 if (attr == &stack_attr) 53 pthread_mutexattr_destroy(&stack_attr); 54 55 return err; 56 } 57 58 int 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
