Dali 3D User Interface Engine
time-service.cpp
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1 /*
2  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 
18 // HEADER
19 #include "base/time-service.h"
20 
21 // EXTERNAL INCLUDES
22 #include <ctime>
23 
24 namespace Dali
25 {
26 
27 namespace Internal
28 {
29 
30 namespace Adaptor
31 {
32 
33 namespace TimeService
34 {
35 
36 namespace
37 {
38 const uint64_t NANOSECONDS_PER_SECOND = 1e+9;
39 }
40 
41 void GetNanoseconds( uint64_t& timeInNanoseconds )
42 {
43  timespec timeSpec;
44  clock_gettime( CLOCK_MONOTONIC, &timeSpec );
45 
46  // Convert all values to uint64_t to match our return type
47  timeInNanoseconds = ( static_cast< uint64_t >( timeSpec.tv_sec ) * NANOSECONDS_PER_SECOND ) + static_cast< uint64_t >( timeSpec.tv_nsec );
48 }
49 
50 void SleepUntil( uint64_t timeInNanoseconds )
51 {
52  timespec timeSpec;
53  timeSpec.tv_sec = timeInNanoseconds / NANOSECONDS_PER_SECOND;
54  timeSpec.tv_nsec = timeInNanoseconds % NANOSECONDS_PER_SECOND;
55 
56  // clock_nanosleep returns 0 if it sleeps for the period specified, otherwise it returns an error value
57  // If an error value is returned, just sleep again till the absolute time specified
58  while( clock_nanosleep( CLOCK_MONOTONIC, TIMER_ABSTIME, &timeSpec, NULL ) )
59  {
60  }
61 }
62 
63 } // namespace TimeService
64 
65 } // namespace Adaptor
66 
67 } // namespace Internal
68 
69 } // namespace Dali
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