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      1 /*
      2  * Copyright (C) 2005 The Android Open Source Project
      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 // Timer functions.
     19 //
     20 #include <utils/Timers.h>
     21 #include <utils/Log.h>
     22 
     23 #include <stdlib.h>
     24 #include <stdio.h>
     25 #include <unistd.h>
     26 #include <sys/time.h>
     27 #include <time.h>
     28 #include <errno.h>
     29 #include <limits.h>
     30 
     31 #ifdef HAVE_WIN32_THREADS
     32 #include <windows.h>
     33 #endif
     34 
     35 #if defined(HAVE_ANDROID_OS)
     36 nsecs_t systemTime(int clock)
     37 {
     38     static const clockid_t clocks[] = {
     39             CLOCK_REALTIME,
     40             CLOCK_MONOTONIC,
     41             CLOCK_PROCESS_CPUTIME_ID,
     42             CLOCK_THREAD_CPUTIME_ID,
     43             CLOCK_BOOTTIME
     44     };
     45     struct timespec t;
     46     t.tv_sec = t.tv_nsec = 0;
     47     clock_gettime(clocks[clock], &t);
     48     return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
     49 }
     50 #else
     51 nsecs_t systemTime(int /*clock*/)
     52 {
     53     // Clock support varies widely across hosts. Mac OS doesn't support
     54     // posix clocks, older glibcs don't support CLOCK_BOOTTIME and Windows
     55     // is windows.
     56     struct timeval t;
     57     t.tv_sec = t.tv_usec = 0;
     58     gettimeofday(&t, NULL);
     59     return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
     60 }
     61 #endif
     62 
     63 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
     64 {
     65     int timeoutDelayMillis;
     66     if (timeoutTime > referenceTime) {
     67         uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
     68         if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
     69             timeoutDelayMillis = -1;
     70         } else {
     71             timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
     72         }
     73     } else {
     74         timeoutDelayMillis = 0;
     75     }
     76     return timeoutDelayMillis;
     77 }
     78