forked from 0ad/0ad
janwas
836cd08d5e
also: - renamed wdll to delay_load, and wdll_ver to dll_ver - removed empty wcpu This was SVN commit r3751.
278 lines
7.2 KiB
C++
Executable File
278 lines
7.2 KiB
C++
Executable File
/**
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* =========================================================================
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* File : timer.h
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* Project : 0 A.D.
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* Description : platform-independent high resolution timer and
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* : FPS measuring code.
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*
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* @author Jan.Wassenberg@stud.uni-karlsruhe.de
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* =========================================================================
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*/
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/*
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* Copyright (c) 2003-2005 Jan Wassenberg
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*
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* Redistribution and/or modification are also permitted under the
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* terms of the GNU General Public License as published by the
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* Free Software Foundation (version 2 or later, at your option).
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef TIMER_H
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#define TIMER_H
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#include <string>
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#include "debug.h" // debug_printf
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#ifdef __cplusplus
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extern "C" {
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#endif
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// high resolution (> 1 us) timestamp [s], starting at or near 0 s.
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extern double get_time(void);
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// return resolution (expressed in [s]) of the time source underlying
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// get_time.
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extern double timer_res(void);
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// calculate fps (call once per frame)
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// several smooth filters (tuned for ~100 FPS)
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// => less fluctuation, but rapid tracking
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extern int fps; // for user display
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extern float spf; // for time-since-last-frame use
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extern void calc_fps(void);
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// since TIMER_ACCRUE et al. are called so often, we try to keep
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// overhead to an absolute minimum. this flag allows storing
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// raw tick counts (e.g. CPU cycles returned by rdtsc) instead of
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// absolute time. there are two benefits:
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// - no need to convert from raw->time on every call
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// (instead, it's only done once when displaying the totals)
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// - possibly less overhead to querying the time itself
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// (get_time may be using slower time sources with ~3us overhead)
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//
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// however, the cycle count is not necessarily a measure of wall-clock time.
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// therefore, on systems with SpeedStep active, measurements of
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// I/O or other non-CPU bound activity may be skewed. this is ok because
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// the timer is only used for profiling; just be aware of the issue.
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// if it's a problem or no raw tick source is available, disable this.
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//
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// note that overflow isn't an issue either way (63 bit cycle counts
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// at 10 GHz cover intervals of 29 years).
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#define TIMER_USE_RAW_TICKS 1
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#if TIMER_USE_RAW_TICKS
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typedef i64 TimerUnit;
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#else
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typedef double TimerUnit;
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#endif
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//
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// cumulative timer API
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//
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// this supplements in-game profiling by providing low-overhead,
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// high resolution time accounting.
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// opaque - do not access its fields!
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// note: must be defined here because clients instantiate them;
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// fields cannot be made private due to C compatibility requirement.
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struct TimerClient
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{
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TimerUnit sum; // total bill
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// only store a pointer for efficiency.
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const char* description;
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TimerClient* next;
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// how often timer_bill_client was called (helps measure relative
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// performance of something that is done indeterminately often).
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uint num_calls;
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};
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// make the given TimerClient (usually instantiated as static data)
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// ready for use. returns its address for TIMER_ADD_CLIENT's convenience.
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// this client's total (added to by timer_bill_client) will be
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// displayed by timer_display_client_totals.
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// notes:
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// - may be called at any time;
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// - always succeeds (there's no fixed limit);
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// - free() is not needed nor possible.
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// - description must remain valid until exit; a string literal is safest.
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extern TimerClient* timer_add_client(TimerClient* tc, const char* description);
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// add <dt> to the client's total.
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extern void timer_bill_client(TimerClient* tc, TimerUnit dt);
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// display all clients' totals; does not reset them.
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// typically called at exit.
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extern void timer_display_client_totals();
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#ifdef __cplusplus
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}
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#endif
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// used via TIMER* macros below.
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class ScopeTimer
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{
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double t0;
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const char* description;
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public:
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ScopeTimer(const char* _description)
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{
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t0 = get_time();
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description = _description;
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}
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~ScopeTimer()
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{
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double t1 = get_time();
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double dt = t1-t0;
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// determine scale factor for pretty display
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double scale = 1e6;
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const char* unit = "us";
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if(dt > 1.0)
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scale = 1, unit = "s";
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else if(dt > 1e-3)
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scale = 1e3, unit = "ms";
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debug_printf("TIMER| %s: %g %s\n", description, dt*scale, unit);
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}
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// disallow copying (makes no sense)
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private:
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ScopeTimer& operator=(const ScopeTimer&);
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};
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/*
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Measure the time taken to execute code up until end of the current scope;
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display it via debug_printf. Can safely be nested.
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Useful for measuring time spent in a function or basic block.
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<description> must remain valid over the lifetime of this object;
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a string literal is safest.
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Example usage:
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void func()
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{
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TIMER("description");
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// code to be measured
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}
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*/
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#define TIMER(description) ScopeTimer UID__(description)
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/*
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Measure the time taken to execute code between BEGIN and END markers;
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display it via debug_printf. Can safely be nested.
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Useful for measuring several pieces of code within the same function/block.
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<description> must remain valid over the lifetime of this object;
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a string literal is safest.
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Caveats:
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- this wraps the code to be measured in a basic block, so any
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variables defined there are invisible to surrounding code.
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- the description passed to END isn't inspected; you are responsible for
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ensuring correct nesting!
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Example usage:
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void func2()
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{
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// uninteresting code
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TIMER_BEGIN("description2");
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// code to be measured
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TIMER_END("description2");
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// uninteresting code
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}
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*/
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#define TIMER_BEGIN(description) { ScopeTimer UID__(description)
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#define TIMER_END(description) }
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// used via TIMER_ACCRUE
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class ScopeTimerAccrue
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{
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TimerUnit t0;
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TimerClient* tc;
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public:
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ScopeTimerAccrue(TimerClient* tc_)
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{
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#if TIMER_USE_RAW_TICKS
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# if CPU_IA32
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t0 = rdtsc();
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# else
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# error "port"
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# endif
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#else
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t0 = get_time();
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#endif
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tc = tc_;
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}
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~ScopeTimerAccrue()
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{
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#if TIMER_USE_RAW_TICKS
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# if CPU_IA32
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TimerUnit t1 = rdtsc();
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# else
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# error "port"
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# endif
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#else
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TimerUnit t1 = get_time();
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#endif
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TimerUnit dt = t1-t0;
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timer_bill_client(tc, dt);
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}
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// disallow copying (makes no sense)
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private:
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ScopeTimerAccrue& operator=(const ScopeTimerAccrue&);
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};
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// "allocate" a new TimerClient that will keep track of the total time
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// billed to it, along with a description string. These are displayed when
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// timer_display_client_totals is called.
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// Invoke this at file or function scope; a (static) TimerClient pointer of
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// name <id> will be defined, which should be passed to TIMER_ACCRUE.
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#define TIMER_ADD_CLIENT(id)\
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static TimerClient UID__;\
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static TimerClient* id = timer_add_client(&UID__, #id);
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/*
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Measure the time taken to execute code up until end of the current scope;
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bill it to the given TimerClient object. Can safely be nested.
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Useful for measuring total time spent in a function or basic block over the
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entire program.
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<description> must remain valid over the lifetime of this object;
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a string literal is safest.
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Example usage:
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TIMER_ADD_CLIENT(identifier)
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void func()
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{
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TIMER_ACCRUE(name_of_pointer_to_client);
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// code to be measured
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}
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[at exit]
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timer_display_client_totals();
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*/
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#define TIMER_ACCRUE(client) ScopeTimerAccrue UID__(client)
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#endif // #ifndef TIMER_H
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