81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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/*
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* libusbx synchronization using POSIX Threads
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*
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* Copyright © 2011 Vitali Lovich <vlovich@aliph.com>
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* Copyright © 2011 Peter Stuge <peter@stuge.se>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if defined(__linux__) || defined(__OpenBSD__)
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# if defined(__linux__)
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# define _GNU_SOURCE
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# else
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# define _BSD_SOURCE
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# endif
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# include <unistd.h>
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# include <sys/syscall.h>
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#elif defined(__APPLE__)
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# include <mach/mach.h>
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#elif defined(__CYGWIN__)
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# include <windows.h>
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#endif
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#include "threads_posix.h"
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int usbi_mutex_init_recursive(pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
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{
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int err;
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pthread_mutexattr_t stack_attr;
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if (!attr) {
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attr = &stack_attr;
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err = pthread_mutexattr_init(&stack_attr);
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if (err != 0)
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return err;
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}
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/* mutexattr_settype requires _GNU_SOURCE or _XOPEN_SOURCE >= 500 on Linux */
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err = pthread_mutexattr_settype(attr, PTHREAD_MUTEX_RECURSIVE);
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if (err != 0)
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goto finish;
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err = pthread_mutex_init(mutex, attr);
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finish:
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if (attr == &stack_attr)
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pthread_mutexattr_destroy(&stack_attr);
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return err;
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}
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int usbi_get_tid(void)
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{
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int ret = -1;
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#if defined(__linux__)
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ret = syscall(SYS_gettid);
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#elif defined(__OpenBSD__)
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/* The following only works with OpenBSD > 5.1 as it requires
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real thread support. For 5.1 and earlier, -1 is returned. */
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ret = syscall(SYS_getthrid);
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#elif defined(__APPLE__)
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ret = mach_thread_self();
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mach_port_deallocate(mach_task_self(), ret);
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#elif defined(__CYGWIN__)
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ret = GetCurrentThreadId();
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#endif
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/* TODO: NetBSD thread ID support */
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return ret;
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}
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