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comparison src/timer/mint/SDL_systimer.c @ 1045:63b8e93a3a52

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Release CPU when waiting
author Patrice Mandin <patmandin@gmail.com>
date Fri, 01 Apr 2005 15:19:26 +0000
parents b8d311d90021
children c9b51268668f
comparison
equal deleted inserted replaced
1044:d36ea7925763 1045:63b8e93a3a52
37 #include <signal.h> 37 #include <signal.h>
38 #include <unistd.h> 38 #include <unistd.h>
39 #include <string.h> 39 #include <string.h>
40 #include <errno.h> 40 #include <errno.h>
41 41
42 #include <mint/cookie.h>
43 #include <mint/sysvars.h>
42 #include <mint/osbind.h> 44 #include <mint/osbind.h>
43 #include <mint/sysvars.h> 45 #include <mint/mintbind.h>
44 46
45 #include "SDL_error.h" 47 #include "SDL_error.h"
46 #include "SDL_timer.h" 48 #include "SDL_timer.h"
47 #include "SDL_timer_c.h" 49 #include "SDL_timer_c.h"
48 #include "SDL_thread.h" 50 #include "SDL_thread.h"
50 #include "mint/SDL_vbltimer_s.h" 52 #include "mint/SDL_vbltimer_s.h"
51 53
52 /* The first ticks value of the application */ 54 /* The first ticks value of the application */
53 static Uint32 start; 55 static Uint32 start;
54 static SDL_bool supervisor; 56 static SDL_bool supervisor;
57 static int mint_present; /* can we use Syield() ? */
55 58
56 void SDL_StartTicks(void) 59 void SDL_StartTicks(void)
57 { 60 {
58 void *oldpile; 61 void *oldpile;
62 unsigned long dummy;
59 63
60 /* Set first ticks value */ 64 /* Set first ticks value */
61 oldpile=(void *)Super(0); 65 oldpile=(void *)Super(0);
62 start=*((volatile long *)_hz_200); 66 start=*((volatile long *)_hz_200);
63 Super(oldpile); 67 Super(oldpile);
64 68
65 start *= 5; /* One _hz_200 tic is 5ms */ 69 start *= 5; /* One _hz_200 tic is 5ms */
70
71 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
66 } 72 }
67 73
68 Uint32 SDL_GetTicks (void) 74 Uint32 SDL_GetTicks (void)
69 { 75 {
70 Uint32 now; 76 Uint32 now;
71 void *oldpile; 77 void *oldpile=NULL;
72 78
73 /* Check if we are in supervisor mode 79 /* Check if we are in supervisor mode
74 (this is the case when called from SDL_ThreadedTimerCheck, 80 (this is the case when called from SDL_ThreadedTimerCheck,
75 which is called from RunTimer, running in the vbl vector) 81 which is called from RunTimer, running in the vbl vector)
76 */ 82 */
91 { 97 {
92 Uint32 now; 98 Uint32 now;
93 99
94 now = SDL_GetTicks(); 100 now = SDL_GetTicks();
95 while ((SDL_GetTicks()-now)<ms){ 101 while ((SDL_GetTicks()-now)<ms){
102 if (mint_present) {
103 Syield();
104 }
96 } 105 }
97 } 106 }
98 107
99 /* Data to handle a single periodic alarm */ 108 /* Data to handle a single periodic alarm */
100 static SDL_bool timer_installed=SDL_FALSE; 109 static SDL_bool timer_installed=SDL_FALSE;