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