SDL 2.0
testtimer.c
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1/*
2 Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
3
4 This software is provided 'as-is', without any express or implied
5 warranty. In no event will the authors be held liable for any damages
6 arising from the use of this software.
7
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
10 freely.
11*/
12
13/* Test program to check the resolution of the SDL timer on the current
14 platform
15*/
16
17#include <stdlib.h>
18#include <stdio.h>
19
20#include "SDL.h"
21
22#define DEFAULT_RESOLUTION 1
23
24static int ticks = 0;
25
26static Uint32 SDLCALL
27ticktock(Uint32 interval, void *param)
28{
29 ++ticks;
30 return (interval);
31}
32
33static Uint32 SDLCALL
34callback(Uint32 interval, void *param)
35{
36 SDL_Log("Timer %d : param = %d\n", interval, (int) (uintptr_t) param);
37 return interval;
38}
39
40int
41main(int argc, char *argv[])
42{
43 int i, desired;
44 SDL_TimerID t1, t2, t3;
45 Uint32 start32, now32;
46 Uint64 start, now;
47
48 /* Enable standard application logging */
50
51 if (SDL_Init(SDL_INIT_TIMER) < 0) {
52 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
53 return (1);
54 }
55
56 /* Start the timer */
57 desired = 0;
58 if (argv[1]) {
59 desired = atoi(argv[1]);
60 }
61 if (desired == 0) {
62 desired = DEFAULT_RESOLUTION;
63 }
64 t1 = SDL_AddTimer(desired, ticktock, NULL);
65
66 /* Wait 10 seconds */
67 SDL_Log("Waiting 10 seconds\n");
68 SDL_Delay(10 * 1000);
69
70 /* Stop the timer */
72
73 /* Print the results */
74 if (ticks) {
75 SDL_Log("Timer resolution: desired = %d ms, actual = %f ms\n",
76 desired, (double) (10 * 1000) / ticks);
77 }
78
79 /* Test multiple timers */
80 SDL_Log("Testing multiple timers...\n");
81 t1 = SDL_AddTimer(100, callback, (void *) 1);
82 if (!t1)
83 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 1: %s\n", SDL_GetError());
84 t2 = SDL_AddTimer(50, callback, (void *) 2);
85 if (!t2)
86 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 2: %s\n", SDL_GetError());
87 t3 = SDL_AddTimer(233, callback, (void *) 3);
88 if (!t3)
89 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 3: %s\n", SDL_GetError());
90
91 /* Wait 10 seconds */
92 SDL_Log("Waiting 10 seconds\n");
93 SDL_Delay(10 * 1000);
94
95 SDL_Log("Removing timer 1 and waiting 5 more seconds\n");
97
98 SDL_Delay(5 * 1000);
99
100 SDL_RemoveTimer(t2);
101 SDL_RemoveTimer(t3);
102
104 for (i = 0; i < 1000000; ++i) {
105 ticktock(0, NULL);
106 }
108 SDL_Log("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
109
110 SDL_Log("Performance counter frequency: %"SDL_PRIu64"\n", (unsigned long long) SDL_GetPerformanceFrequency());
111 start32 = SDL_GetTicks();
113 SDL_Delay(1000);
115 now32 = SDL_GetTicks();
116 SDL_Log("Delay 1 second = %d ms in ticks, %f ms according to performance counter\n", (now32-start32), (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
117
118 SDL_Quit();
119 return (0);
120}
121
122/* vi: set ts=4 sw=4 expandtab: */
#define SDL_INIT_TIMER
Definition: SDL.h:77
unsigned int uintptr_t
#define SDL_GetError
#define SDL_AddTimer
#define SDL_RemoveTimer
#define SDL_LogSetPriority
#define SDL_LogError
#define SDL_GetPerformanceCounter
#define SDL_Delay
#define SDL_Quit
#define SDL_Init
#define SDL_Log
#define SDLCALL
Definition: SDL_internal.h:49
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
GLuint start
Definition: SDL_opengl.h:1571
GLfloat param
GLuint GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat t1
#define SDL_PRIu64
Definition: SDL_stdinc.h:238
uint32_t Uint32
Definition: SDL_stdinc.h:203
uint64_t Uint64
Definition: SDL_stdinc.h:216
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
Uint64 SDL_GetPerformanceFrequency(void)
Get the count per second of the high resolution counter.
int SDL_TimerID
Definition: SDL_timer.h:86
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:167
int main(int argc, char *argv[])
Definition: testtimer.c:41
#define DEFAULT_RESOLUTION
Definition: testtimer.c:22
static Uint32 ticktock(Uint32 interval, void *param)
Definition: testtimer.c:27
static int ticks
Definition: testtimer.c:24
static Uint32 callback(Uint32 interval, void *param)
Definition: testtimer.c:34