4 * Copyright 1996 Alexandre Julliard
11 #include <sys/timeb.h>
12 #include <sys/types.h>
16 #include "selectors.h"
17 #include "sig_context.h"
23 SYSTEMTIMERPROC callback; /* NULL if not in use */
28 #define NB_SYS_TIMERS 8
29 #define SYS_TIMER_RATE 54925
31 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
32 static int SYS_NbTimers = 0;
33 static BOOL32 SYS_TimersDisabled = FALSE;
36 /***********************************************************************
39 static HANDLER_DEF(SYSTEM_TimerTick)
44 for (i = 0; i < NB_SYS_TIMERS; i++)
46 if (!SYS_Timers[i].callback) continue;
47 if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
49 SYS_Timers[i].ticks += SYS_Timers[i].rate;
50 SYS_Timers[i].callback( i+1 );
55 /**********************************************************************
58 * Start the system tick timer.
60 static void SYSTEM_StartTicks(void)
62 static BOOL32 handler_installed = FALSE;
64 if (!handler_installed)
66 handler_installed = TRUE;
67 SIGNAL_SetHandler( SIGALRM, SYSTEM_TimerTick, 1 );
69 #ifndef __EMX__ /* FIXME: Time don't work... Use BIOS directly instead */
71 struct itimerval vt_timer;
73 vt_timer.it_interval.tv_sec = 0;
74 vt_timer.it_interval.tv_usec = 54929;
75 vt_timer.it_value = vt_timer.it_interval;
76 setitimer( ITIMER_REAL, &vt_timer, NULL );
82 /**********************************************************************
85 * Stop the system tick timer.
87 static void SYSTEM_StopTicks(void)
89 #ifndef __EMX__ /* FIXME: Time don't work... Use BIOS directly instead */
90 struct itimerval vt_timer;
92 vt_timer.it_interval.tv_sec = 0;
93 vt_timer.it_interval.tv_usec = 0;
94 vt_timer.it_value = vt_timer.it_interval;
95 setitimer( ITIMER_REAL, &vt_timer, NULL );
100 /***********************************************************************
101 * InquireSystem (SYSTEM.1)
103 * Note: the function always takes 2 WORD arguments, contrary to what
104 * "Undocumented Windows" says.
106 DWORD WINAPI InquireSystem( WORD code, WORD arg )
112 case 0: /* Get timer resolution */
113 return SYS_TIMER_RATE;
115 case 1: /* Get drive type */
116 drivetype = GetDriveType16( arg );
117 return MAKELONG( drivetype, drivetype );
119 case 2: /* Enable one-drive logic */
120 FIXME(system, "Case %d: set single-drive %d not supported\n", code, arg );
123 WARN(system, "Unknown code %d\n", code );
128 /***********************************************************************
129 * CreateSystemTimer (SYSTEM.2)
131 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
134 for (i = 0; i < NB_SYS_TIMERS; i++)
135 if (!SYS_Timers[i].callback) /* Found one */
137 SYS_Timers[i].rate = (UINT32)rate * 1000;
138 if (SYS_Timers[i].rate < SYS_TIMER_RATE)
139 SYS_Timers[i].rate = SYS_TIMER_RATE;
140 SYS_Timers[i].ticks = SYS_Timers[i].rate;
141 SYS_Timers[i].callback = callback;
142 if ((++SYS_NbTimers == 1) && !SYS_TimersDisabled)
144 return i + 1; /* 0 means error */
150 /***********************************************************************
151 * KillSystemTimer (SYSTEM.3)
153 * Note: do not confuse this function with USER.182
155 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
157 if (!timer || (timer > NB_SYS_TIMERS)) return timer; /* Error */
158 SYS_Timers[timer-1].callback = NULL;
159 if ((!--SYS_NbTimers) && !SYS_TimersDisabled) SYSTEM_StopTicks();
164 /***********************************************************************
165 * EnableSystemTimers (SYSTEM.4)
167 void WINAPI EnableSystemTimers(void)
169 SYS_TimersDisabled = FALSE;
170 if (SYS_NbTimers) SYSTEM_StartTicks();
174 /***********************************************************************
175 * DisableSystemTimers (SYSTEM.5)
177 void WINAPI DisableSystemTimers(void)
179 SYS_TimersDisabled = TRUE;
180 if (SYS_NbTimers) SYSTEM_StopTicks();