1 | // boost thread_clock.cpp -----------------------------------------------------------//
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2 |
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3 | // Copyright Beman Dawes 1994, 2006, 2008
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4 | // Copyright Vicente J. Botet Escriba 2009-2011
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5 |
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6 | // Distributed under the Boost Software License, Version 1.0.
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7 | // See http://www.boost.org/LICENSE_1_0.txt
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8 |
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9 | // See http://www.boost.org/libs/chrono for documentation.
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10 |
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11 | //--------------------------------------------------------------------------------------//
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12 |
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13 | #include <boost/chrono/config.hpp>
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14 | #include <boost/chrono/thread_clock.hpp>
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15 | #include <cassert>
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16 |
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17 | #if !defined(__VXWORKS__)
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18 | # include <sys/times.h>
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19 | #endif
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20 | # include <pthread.h>
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21 | # include <unistd.h>
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22 |
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23 | namespace boost { namespace chrono {
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24 |
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25 | thread_clock::time_point thread_clock::now( ) BOOST_NOEXCEPT
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26 | {
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27 | struct timespec ts;
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28 | #if defined CLOCK_THREAD_CPUTIME_ID
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29 | // get the timespec associated to the thread clock
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30 | if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
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31 | #else
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32 | // get the current thread
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33 | pthread_t pth=pthread_self();
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34 | // get the clock_id associated to the current thread
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35 | clockid_t clock_id;
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36 | pthread_getcpuclockid(pth, &clock_id);
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37 | // get the timespec associated to the thread clock
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38 | if ( ::clock_gettime( clock_id, &ts ) )
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39 | #endif
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40 | {
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41 | BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
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42 | }
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43 |
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44 | // transform to nanoseconds
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45 | return time_point(duration(
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46 | static_cast<thread_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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47 |
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48 | }
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49 |
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50 | #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
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51 | thread_clock::time_point thread_clock::now( system::error_code & ec )
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52 | {
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53 | struct timespec ts;
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54 | #if defined CLOCK_THREAD_CPUTIME_ID
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55 | // get the timespec associated to the thread clock
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56 | if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
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57 | #else
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58 | // get the current thread
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59 | pthread_t pth=pthread_self();
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60 | // get the clock_id associated to the current thread
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61 | clockid_t clock_id;
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62 | pthread_getcpuclockid(pth, &clock_id);
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63 | // get the timespec associated to the thread clock
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64 | if ( ::clock_gettime( clock_id, &ts ) )
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65 | #endif
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66 | {
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67 | if (BOOST_CHRONO_IS_THROWS(ec))
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68 | {
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69 | boost::throw_exception(
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70 | system::system_error(
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71 | errno,
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72 | BOOST_CHRONO_SYSTEM_CATEGORY,
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73 | "chrono::thread_clock" ));
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74 | }
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75 | else
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76 | {
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77 | ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
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78 | return time_point();
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79 | }
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80 | }
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81 | if (!BOOST_CHRONO_IS_THROWS(ec))
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82 | {
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83 | ec.clear();
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84 | }
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85 | // transform to nanoseconds
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86 | return time_point(duration(
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87 | static_cast<thread_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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88 |
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89 | }
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90 | #endif
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91 | } }
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