SDL 2.0
testtimer.c File Reference
#include <stdlib.h>
#include <stdio.h>
#include "SDL.h"
+ Include dependency graph for testtimer.c:

Go to the source code of this file.

Macros

#define DEFAULT_RESOLUTION   1
 

Functions

static Uint32 ticktock (Uint32 interval, void *param)
 
static Uint32 callback (Uint32 interval, void *param)
 
int main (int argc, char *argv[])
 

Variables

static int ticks = 0
 

Macro Definition Documentation

◆ DEFAULT_RESOLUTION

#define DEFAULT_RESOLUTION   1

Definition at line 22 of file testtimer.c.

Function Documentation

◆ callback()

◆ main()

int main ( int  argc,
char *  argv[] 
)

Definition at line 41 of file testtimer.c.

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}
#define SDL_INIT_TIMER
Definition: SDL.h:77
#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
@ 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
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
#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

References callback(), DEFAULT_RESOLUTION, i, NULL, SDL_AddTimer, SDL_Delay, SDL_GetError, SDL_GetPerformanceCounter, SDL_GetPerformanceFrequency(), SDL_GetTicks(), SDL_Init, SDL_INIT_TIMER, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_PRIu64, SDL_Quit, SDL_RemoveTimer, ticks, and ticktock().

◆ ticktock()

static Uint32 ticktock ( Uint32  interval,
void param 
)
static

Definition at line 27 of file testtimer.c.

28{
29 ++ticks;
30 return (interval);
31}

References ticks.

Referenced by main().

Variable Documentation

◆ ticks

int ticks = 0
static

Definition at line 24 of file testtimer.c.

Referenced by main(), and ticktock().