XIAOHUI TAO / Mbed 2 deprecated hw2_protothread

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

timer.h@0:ee91220d7bea, 2010-11-30 (annotated)

Committer:
taoxh
Date:
Tue Nov 30 23:53:06 2010 +0000
Revision:
0:ee91220d7bea
HW2 PROTOTHREAD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
taoxh 0:ee91220d7bea 1 #ifndef TIMER_H
taoxh 0:ee91220d7bea 2 #define TIMER_H
taoxh 0:ee91220d7bea 3
taoxh 0:ee91220d7bea 4 #include <ctime>
taoxh 0:ee91220d7bea 5 #include <iostream>
taoxh 0:ee91220d7bea 6 #include <iomanip>
taoxh 0:ee91220d7bea 7
taoxh 0:ee91220d7bea 8 class timer
taoxh 0:ee91220d7bea 9 {
taoxh 0:ee91220d7bea 10 friend std::ostream& operator<<(std::ostream& os, timer& t);
taoxh 0:ee91220d7bea 11
taoxh 0:ee91220d7bea 12 private:
taoxh 0:ee91220d7bea 13 bool running;
taoxh 0:ee91220d7bea 14 clock_t start_clock;
taoxh 0:ee91220d7bea 15 time_t start_time;
taoxh 0:ee91220d7bea 16 double acc_time;
taoxh 0:ee91220d7bea 17
taoxh 0:ee91220d7bea 18 double elapsed_time();
taoxh 0:ee91220d7bea 19
taoxh 0:ee91220d7bea 20 public:
taoxh 0:ee91220d7bea 21 // 'running' is initially false. A timer needs to be explicitly started
taoxh 0:ee91220d7bea 22 // using 'start' or 'restart'
taoxh 0:ee91220d7bea 23 timer() : running(false), start_clock(0), start_time(0), acc_time(0) { }
taoxh 0:ee91220d7bea 24
taoxh 0:ee91220d7bea 25 void start(const char* msg = 0);
taoxh 0:ee91220d7bea 26 void restart(const char* msg = 0);
taoxh 0:ee91220d7bea 27 void stop(const char* msg = 0);
taoxh 0:ee91220d7bea 28 void check(const char* msg = 0);
taoxh 0:ee91220d7bea 29
taoxh 0:ee91220d7bea 30 }; // class timer
taoxh 0:ee91220d7bea 31
taoxh 0:ee91220d7bea 32 //===========================================================================
taoxh 0:ee91220d7bea 33 // Return the total time that the timer has been in the "running"
taoxh 0:ee91220d7bea 34 // state since it was first "started" or last "restarted". For
taoxh 0:ee91220d7bea 35 // "short" time periods (less than an hour), the actual cpu time
taoxh 0:ee91220d7bea 36 // used is reported instead of the elapsed time.
taoxh 0:ee91220d7bea 37
taoxh 0:ee91220d7bea 38 inline double timer::elapsed_time()
taoxh 0:ee91220d7bea 39 {
taoxh 0:ee91220d7bea 40 time_t acc_sec = time(0) - start_time;
taoxh 0:ee91220d7bea 41 if (acc_sec < 3600)
taoxh 0:ee91220d7bea 42 return (clock() - start_clock) / (1.0 * CLOCKS_PER_SEC);
taoxh 0:ee91220d7bea 43 else
taoxh 0:ee91220d7bea 44 return (1.0 * acc_sec);
taoxh 0:ee91220d7bea 45
taoxh 0:ee91220d7bea 46 } // timer::elapsed_time
taoxh 0:ee91220d7bea 47
taoxh 0:ee91220d7bea 48 //===========================================================================
taoxh 0:ee91220d7bea 49 // Start a timer. If it is already running, let it continue running.
taoxh 0:ee91220d7bea 50 // Print an optional message.
taoxh 0:ee91220d7bea 51
taoxh 0:ee91220d7bea 52 inline void timer::start(const char* msg)
taoxh 0:ee91220d7bea 53 {
taoxh 0:ee91220d7bea 54 // Print an optional message, something like "Starting timer t";
taoxh 0:ee91220d7bea 55 if (msg) std::cout << msg << std::endl;
taoxh 0:ee91220d7bea 56
taoxh 0:ee91220d7bea 57 // Return immediately if the timer is already running
taoxh 0:ee91220d7bea 58 if (running) return;
taoxh 0:ee91220d7bea 59
taoxh 0:ee91220d7bea 60 // Set timer status to running and set the start time
taoxh 0:ee91220d7bea 61 running = true;
taoxh 0:ee91220d7bea 62 start_clock = clock();
taoxh 0:ee91220d7bea 63 start_time = time(0);
taoxh 0:ee91220d7bea 64
taoxh 0:ee91220d7bea 65 } // timer::start
taoxh 0:ee91220d7bea 66
taoxh 0:ee91220d7bea 67 //===========================================================================
taoxh 0:ee91220d7bea 68 // Turn the timer off and start it again from 0. Print an optional message.
taoxh 0:ee91220d7bea 69
taoxh 0:ee91220d7bea 70 inline void timer::restart(const char* msg)
taoxh 0:ee91220d7bea 71 {
taoxh 0:ee91220d7bea 72 // Print an optional message, something like "Restarting timer t";
taoxh 0:ee91220d7bea 73 if (msg) std::cout << msg << std::endl;
taoxh 0:ee91220d7bea 74
taoxh 0:ee91220d7bea 75 // Set timer status to running, reset accumulated time, and set start time
taoxh 0:ee91220d7bea 76 running = true;
taoxh 0:ee91220d7bea 77 acc_time = 0;
taoxh 0:ee91220d7bea 78 start_clock = clock();
taoxh 0:ee91220d7bea 79 start_time = time(0);
taoxh 0:ee91220d7bea 80
taoxh 0:ee91220d7bea 81 } // timer::restart
taoxh 0:ee91220d7bea 82
taoxh 0:ee91220d7bea 83 //===========================================================================
taoxh 0:ee91220d7bea 84 // Stop the timer and print an optional message.
taoxh 0:ee91220d7bea 85
taoxh 0:ee91220d7bea 86 inline void timer::stop(const char* msg)
taoxh 0:ee91220d7bea 87 {
taoxh 0:ee91220d7bea 88 // Print an optional message, something like "Stopping timer t";
taoxh 0:ee91220d7bea 89 if (msg) std::cout << msg << std::endl;
taoxh 0:ee91220d7bea 90
taoxh 0:ee91220d7bea 91 // Compute accumulated running time and set timer status to not running
taoxh 0:ee91220d7bea 92 if (running) acc_time += elapsed_time();
taoxh 0:ee91220d7bea 93 running = false;
taoxh 0:ee91220d7bea 94
taoxh 0:ee91220d7bea 95 } // timer::stop
taoxh 0:ee91220d7bea 96
taoxh 0:ee91220d7bea 97 //===========================================================================
taoxh 0:ee91220d7bea 98 // Print out an optional message followed by the current timer timing.
taoxh 0:ee91220d7bea 99
taoxh 0:ee91220d7bea 100 inline void timer::check(const char* msg)
taoxh 0:ee91220d7bea 101 {
taoxh 0:ee91220d7bea 102 // Print an optional message, something like "Checking timer t";
taoxh 0:ee91220d7bea 103 if (msg) std::cout << msg << " : ";
taoxh 0:ee91220d7bea 104
taoxh 0:ee91220d7bea 105 std::cout << "Elapsed time [" << std::setiosflags(std::ios::fixed)
taoxh 0:ee91220d7bea 106 << std::setprecision(2)
taoxh 0:ee91220d7bea 107 << acc_time + (running ? elapsed_time() : 0) << "] seconds\n";
taoxh 0:ee91220d7bea 108
taoxh 0:ee91220d7bea 109 } // timer::check
taoxh 0:ee91220d7bea 110
taoxh 0:ee91220d7bea 111 //===========================================================================
taoxh 0:ee91220d7bea 112 // Allow timers to be printed to ostreams using the syntax 'os << t'
taoxh 0:ee91220d7bea 113 // for an ostream 'os' and a timer 't'. For example, "cout << t" will
taoxh 0:ee91220d7bea 114 // print out the total amount of time 't' has been "running".
taoxh 0:ee91220d7bea 115
taoxh 0:ee91220d7bea 116 inline std::ostream& operator<<(std::ostream& os, timer& t)
taoxh 0:ee91220d7bea 117 {
taoxh 0:ee91220d7bea 118 os << std::setprecision(2) << std::setiosflags(std::ios::fixed)
taoxh 0:ee91220d7bea 119 << t.acc_time + (t.running ? t.elapsed_time() : 0);
taoxh 0:ee91220d7bea 120 return os;
taoxh 0:ee91220d7bea 121 }
taoxh 0:ee91220d7bea 122
taoxh 0:ee91220d7bea 123 //===========================================================================
taoxh 0:ee91220d7bea 124
taoxh 0:ee91220d7bea 125 #endif // TIMER_H
taoxh 0:ee91220d7bea 126