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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
*/
#include "libusbi.h"
#include <errno.h>
#if defined(__ANDROID__)
# include <unistd.h>
#elif defined(__HAIKU__)
# include <os/kernel/OS.h>
#elif defined(__linux__)
# include <sys/syscall.h>
# include <unistd.h>
#elif defined(__NetBSD__)
# include <lwp.h>
#elif defined(__OpenBSD__)
# define _BSD_SOURCE
# include <sys/syscall.h>
# include <unistd.h>
#elif defined(__sun__)
# include <sys/lwp.h>
#endif
void usbi_cond_init(pthread_cond_t *cond)
{
#ifdef HAVE_PTHREAD_CONDATTR_SETCLOCK
pthread_condattr_t condattr;
PTHREAD_CHECK(pthread_condattr_init(&condattr));
PTHREAD_CHECK(pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC));
PTHREAD_CHECK(pthread_cond_init(cond, &condattr));
PTHREAD_CHECK(pthread_condattr_destroy(&condattr));
#else
PTHREAD_CHECK(pthread_cond_init(cond, NULL));
#endif
}
int usbi_cond_timedwait(pthread_cond_t *cond,
pthread_mutex_t *mutex, const struct timeval *tv)
{
struct timespec timeout;
int r;
#ifdef HAVE_PTHREAD_CONDATTR_SETCLOCK
usbi_get_monotonic_time(&timeout);
#else
usbi_get_real_time(&timeout);
#endif
timeout.tv_sec += tv->tv_sec;
timeout.tv_nsec += tv->tv_usec * 1000L;
if (timeout.tv_nsec >= NSEC_PER_SEC) {
timeout.tv_nsec -= NSEC_PER_SEC;
timeout.tv_sec++;
}
r = pthread_cond_timedwait(cond, mutex, &timeout);
if (r == 0)
return 0;
else if (r == ETIMEDOUT)
return LIBUSB_ERROR_TIMEOUT;
else
return LIBUSB_ERROR_OTHER;
}
unsigned int usbi_get_tid(void)
{
static _Thread_local unsigned int tl_tid;
int tid;
if (tl_tid)
return tl_tid;
#if defined(__ANDROID__)
tid = gettid();
#elif defined(__APPLE__)
#ifdef HAVE_PTHREAD_THREADID_NP
uint64_t thread_id;
if (pthread_threadid_np(NULL, &thread_id) == 0)
tid = (int)thread_id;
else
tid = -1;
#else
tid = (int)pthread_mach_thread_np(pthread_self());
#endif
#elif defined(__HAIKU__)
tid = get_pthread_thread_id(pthread_self());
#elif defined(__linux__)
tid = (int)syscall(SYS_gettid);
#elif defined(__NetBSD__)
tid = _lwp_self();
#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. */
tid = syscall(SYS_getthrid);
#elif defined(__sun__)
tid = _lwp_self();
#else
tid = -1;
#endif
if (tid == -1) {
/* If we don't have a thread ID, at least return a unique
* value that can be used to distinguish individual
* threads. */
tid = (int)(intptr_t)pthread_self();
}
return tl_tid = (unsigned int)tid;
}
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