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annotate packages/language/c/libc/time/current/src/clock.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children 0ae0bc38e387
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115
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1 //===========================================================================
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2 //
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3 // clock.cxx
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4 //
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5 // ISO C date and time implementation for clock()
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6 //
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7 //===========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors: jlarmour
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36 // Date: 1999-03-05
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37 // Purpose: Provides an implementation of the ISO C function clock()
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38 // from ISO C section 7.12.2.1
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39 // Description: This file uses the kernel real time clock to determine
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40 // the complete running time of the system - since we only
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41 // have one task, even though there are perhaps multiple threads
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42 // that is still the running time of the "program"
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43 // Usage:
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //===========================================================================
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48
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49 // CONFIGURATION
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50
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51 #include <pkgconf/libc_time.h> // Configuration header
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52
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53 #ifdef CYGSEM_LIBC_TIME_CLOCK_WORKING
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54 # include <pkgconf/kernel.h> // Kernel config header
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55 #endif
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56
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57 // INCLUDES
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58
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59 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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60 #include <cyg/infra/cyg_ass.h> // Assertion infrastructure
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61 #include <cyg/infra/cyg_trac.h> // Tracing infrastructure
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62
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63 #include <time.h> // Header for all time-related functions
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64
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65 #ifdef CYGSEM_LIBC_TIME_CLOCK_WORKING
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66 # include <cyg/kernel/clock.hxx> // Kernel clock definitions
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67 # include <cyg/kernel/clock.inl> // Kernel clock inline functions
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68 #endif
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69
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70
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71 // TRACE
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72
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73 # if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_LIBC_TIME_CLOCK_TRACE_LEVEL)
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74 static int clock_trace = CYGNUM_LIBC_TIME_CLOCK_TRACE_LEVEL;
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75 # define TL1 (0 < clock_trace)
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76 # else
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77 # define TL1 (0)
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78 # endif
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79
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80 // FUNCTIONS
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81
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82 externC clock_t
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83 clock( void )
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84 {
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85 CYG_REPORT_FUNCNAMETYPE( "clock", "returning clock tick %d" );
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86 CYG_REPORT_FUNCARGVOID();
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87
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88 #ifdef CYGSEM_LIBC_TIME_CLOCK_WORKING
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89 cyg_tick_count curr_clock; // kernel clock value
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90 Cyg_Clock::cyg_resolution resolution; // kernel clock resolution
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91 clock_t clocks;
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92
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93 CYG_TRACE0( TL1, "getting clock resolution" );
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94
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95 // get the resolution
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96 resolution = Cyg_Clock::real_time_clock->get_resolution();
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97
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98 CYG_TRACE2( TL1, "got resolution dividend %d divisor %d. Getting "
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99 "clock value", resolution.dividend, resolution.divisor );
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100
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101 // get the value
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102 curr_clock = Cyg_Clock::real_time_clock->current_value();
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103
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104 CYG_TRACE1( TL1, "got clock value %d", curr_clock );
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105
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106 // scale the value so that clock()/CLOCKS_PER_SEC works - clock_t
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107 // should be big enough to cope
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108 clocks = ((clock_t)curr_clock * resolution.dividend) /
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109 (resolution.divisor * (1000000000 / CLOCKS_PER_SEC));
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110
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111 CYG_REPORT_RETVAL( clocks );
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112 return clocks;
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113
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114 #else // i.e. ifndef CYGSEM_LIBC_TIME_CLOCK_WORKING
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115 CYG_REPORT_RETVAL( -1 );
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116 return (clock_t) -1;
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117 #endif
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118
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119 } // clock()
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120
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121
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122 // EOF clock.cxx