2 * Copyright (c) 2008-2009 Apple Inc. All rights reserved.
4 * @APPLE_APACHE_LICENSE_HEADER_START@
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * @APPLE_APACHE_LICENSE_HEADER_END@
23 // for architectures that don't always return mach_absolute_time() in nanoseconds
24 #if !(defined(__i386__) || defined(__x86_64__) || !defined(HAVE_MACH_ABSOLUTE_TIME))
25 _dispatch_host_time_data_s _dispatch_host_time_data;
28 _dispatch_get_host_time_init(void *context __attribute__((unused)))
30 mach_timebase_info_data_t tbi;
31 (void)dispatch_assume_zero(mach_timebase_info(&tbi));
32 _dispatch_host_time_data.frac = tbi.numer;
33 _dispatch_host_time_data.frac /= tbi.denom;
34 _dispatch_host_time_data.ratio_1_to_1 = (tbi.numer == tbi.denom);