src/Windows/timer_windows.cpp

/*
 *  timer_windows.cpp - Time Manager emulation, Windows specific stuff
 *
 *  Basilisk II (C) 1997-2005 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#include "main.h"
#include "macos_util.h"
#include "timer.h"

#define DEBUG 0
#include "debug.h"


// Helper time functions
#define MSECS2TICKS(MSECS) (((uint64)(MSECS) * frequency) / 1000)
#define USECS2TICKS(USECS) (((uint64)(USECS) * frequency) / 1000000)
#define TICKS2USECS(TICKS) (((uint64)(TICKS) * 1000000) / frequency)

// From main_windows.cpp
extern HANDLE emul_thread;

// Global variables
static uint32 frequency;                                // CPU frequency in Hz (< 4 GHz)
static tm_time_t mac_boot_ticks;
static tm_time_t mac_1904_ticks;
static tm_time_t mac_now_diff;


/*
 *  Initialize native Windows timers
 */

void timer_init(void)
{
        D(bug("SysTimerInit\n"));

        LARGE_INTEGER tt;
        if (!QueryPerformanceFrequency(&tt)) {
                ErrorAlert("No high resolution timers available\n");
                QuitEmulator();
        }
        frequency = tt.LowPart;
        D(bug(" frequency %d\n", frequency));

        // mac_boot_ticks is 1.18 us since Basilisk II was started
        QueryPerformanceCounter(&tt);
        mac_boot_ticks = tt.QuadPart;

        // mac_1904_ticks is 1.18 us since Mac time started 1904
        mac_1904_ticks = time(NULL) * frequency;
        mac_now_diff = mac_1904_ticks - mac_boot_ticks;
}


  /*
 *  Return microseconds since boot (64 bit)
 */

void Microseconds(uint32 &hi, uint32 &lo)
{
        D(bug("Microseconds\n"));
        LARGE_INTEGER tt;
        QueryPerformanceCounter(&tt);
        tt.QuadPart = TICKS2USECS(tt.QuadPart - mac_boot_ticks);
        hi = tt.HighPart;
        lo = tt.LowPart;
}


/*
 *  Return local date/time in Mac format (seconds since 1.1.1904)
 */

uint32 TimerDateTime(void)
{
        return TimeToMacTime(time(NULL));
}


/*
 *  Get current time
 */

void timer_current_time(tm_time_t &t)
{
        LARGE_INTEGER tt;
        QueryPerformanceCounter(&tt);
        t = tt.QuadPart + mac_now_diff;
}


/*
 *  Add times
 */

void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
{
        res = a + b;
}


/*
 *  Subtract times
 */

void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
{
        res = a - b;
}


/*
 *  Compare times (<0: a < b, =0: a = b, >0: a > b)
 */

int timer_cmp_time(tm_time_t a, tm_time_t b)
{
        tm_time_t r = a - b;
        return r < 0 ? -1 : (r > 0 ? 1 : 0);
}


/*
 *  Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
 */

void timer_mac2host_time(tm_time_t &res, int32 mactime)
{
        if (mactime > 0) {
                // Time in milliseconds
                res = MSECS2TICKS(mactime);
        } else {
                // Time in negative microseconds
                res = USECS2TICKS(-mactime);
        }
}


/*
 *  Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
 *  A negative input value for hosttime results in a zero return value
 *  As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
 */

int32 timer_host2mac_time(tm_time_t hosttime)
{
        if (hosttime < 0)
                return 0;
        else {
                uint64 t = TICKS2USECS(hosttime);
                if (t > 0x7fffffff)
                        return t / 1000;        // Time in milliseconds
                else
                        return -t;                      // Time in negative microseconds
        }
}


/*
 *  Get current value of microsecond timer
 */

uint64 GetTicks_usec(void)
{
        LARGE_INTEGER tt;
        QueryPerformanceCounter(&tt);
        return TICKS2USECS(tt.QuadPart - mac_boot_ticks);
}


/*
 *  Delay by specified number of microseconds (<1 second)
 */

void Delay_usec(uint32 usec)
{
        // FIXME: fortunately, Delay_usec() is generally used with
        // millisecond resolution anyway
        Sleep(usec / 1000);
}


/*
 *  Suspend emulator thread, virtual CPU in idle mode
 */

struct idle_sentinel {
        idle_sentinel();
        ~idle_sentinel();
};
static idle_sentinel idle_sentinel;

static int idle_sem_ok = -1;
static HANDLE idle_sem = NULL;

static HANDLE idle_lock = NULL;
#define LOCK_IDLE WaitForSingleObject(idle_lock, INFINITE)
#define UNLOCK_IDLE ReleaseMutex(idle_lock)

idle_sentinel::idle_sentinel()
{
        LOCK_IDLE;
        idle_sem_ok = 1;
        if ((idle_sem = CreateSemaphore(0, 0, 1, NULL)) == NULL)
                idle_sem_ok = 0;
        if ((idle_lock = CreateMutex(NULL, FALSE, NULL)) == NULL)
                idle_sem_ok = 0;
        UNLOCK_IDLE;
}

idle_sentinel::~idle_sentinel()
{
        if (idle_lock) {
                ReleaseMutex(idle_lock);
                CloseHandle(idle_lock);
        }
        if (idle_sem) {
                ReleaseSemaphore(idle_sem, 1, NULL);
                CloseHandle(idle_sem);
        }
}

void idle_wait(void)
{
        LOCK_IDLE;
        if (idle_sem_ok > 0) {
                idle_sem_ok++;
                UNLOCK_IDLE;
                WaitForSingleObject(idle_sem, INFINITE);
                return;
        }
        UNLOCK_IDLE;

        // Fallback: sleep 10 ms (this should not happen though)
        Delay_usec(10000);
}


/*
 *  Resume execution of emulator thread, events just arrived
 */

void idle_resume(void)
{
        LOCK_IDLE;
        if (idle_sem_ok > 1) {
                idle_sem_ok--;
                UNLOCK_IDLE;
                ReleaseSemaphore(idle_sem, 1, NULL);
                return;
        }
        UNLOCK_IDLE;
}
Revision:	1.6
Committed:	2006-05-01T06:12:50Z (18 years, 7 months ago) by gbeauche
Branch:	MAIN
Changes since 1.5:	+57 -0 lines
Log Message:	Implement better Windows suspend/resume routines so that we don't oversleep. i.e. really wake up the thread on next TriggerInterrupt().
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* timer_windows.cpp - Time Manager emulation, Windows specific stuff
3			*
4	gbeauche	1.4	* Basilisk II (C) 1997-2005 Christian Bauer
5	gbeauche	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include "sysdeps.h"
22
23			#define WIN32_LEAN_AND_MEAN
24			#include <windows.h>
25
26			#include "main.h"
27			#include "macos_util.h"
28			#include "timer.h"
29
30			#define DEBUG 0
31			#include "debug.h"
32
33
34			// Helper time functions
35			#define MSECS2TICKS(MSECS) (((uint64)(MSECS) * frequency) / 1000)
36			#define USECS2TICKS(USECS) (((uint64)(USECS) * frequency) / 1000000)
37			#define TICKS2USECS(TICKS) (((uint64)(TICKS) * 1000000) / frequency)
38
39	gbeauche	1.6	// From main_windows.cpp
40			extern HANDLE emul_thread;
41
42	gbeauche	1.1	// Global variables
43			static uint32 frequency; // CPU frequency in Hz (< 4 GHz)
44			static tm_time_t mac_boot_ticks;
45			static tm_time_t mac_1904_ticks;
46			static tm_time_t mac_now_diff;
47
48
49			/*
50			* Initialize native Windows timers
51			*/
52
53	gbeauche	1.3	void timer_init(void)
54	gbeauche	1.1	{
55			D(bug("SysTimerInit\n"));
56
57			LARGE_INTEGER tt;
58			if (!QueryPerformanceFrequency(&tt)) {
59			ErrorAlert("No high resolution timers available\n");
60			QuitEmulator();
61			}
62			frequency = tt.LowPart;
63			D(bug(" frequency %d\n", frequency));
64
65			// mac_boot_ticks is 1.18 us since Basilisk II was started
66			QueryPerformanceCounter(&tt);
67			mac_boot_ticks = tt.QuadPart;
68
69			// mac_1904_ticks is 1.18 us since Mac time started 1904
70			mac_1904_ticks = time(NULL) * frequency;
71			mac_now_diff = mac_1904_ticks - mac_boot_ticks;
72			}
73
74
75			/*
76			* Return microseconds since boot (64 bit)
77			*/
78
79			void Microseconds(uint32 &hi, uint32 &lo)
80			{
81			D(bug("Microseconds\n"));
82			LARGE_INTEGER tt;
83			QueryPerformanceCounter(&tt);
84			tt.QuadPart = TICKS2USECS(tt.QuadPart - mac_boot_ticks);
85			hi = tt.HighPart;
86			lo = tt.LowPart;
87			}
88
89
90			/*
91			* Return local date/time in Mac format (seconds since 1.1.1904)
92			*/
93
94			uint32 TimerDateTime(void)
95			{
96			return TimeToMacTime(time(NULL));
97			}
98
99
100			/*
101			* Get current time
102			*/
103
104			void timer_current_time(tm_time_t &t)
105			{
106			LARGE_INTEGER tt;
107			QueryPerformanceCounter(&tt);
108			t = tt.QuadPart + mac_now_diff;
109			}
110
111
112			/*
113			* Add times
114			*/
115
116			void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
117			{
118			res = a + b;
119			}
120
121
122			/*
123			* Subtract times
124			*/
125
126			void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
127			{
128			res = a - b;
129			}
130
131
132			/*
133			* Compare times (<0: a < b, =0: a = b, >0: a > b)
134			*/
135
136			int timer_cmp_time(tm_time_t a, tm_time_t b)
137			{
138			tm_time_t r = a - b;
139			return r < 0 ? -1 : (r > 0 ? 1 : 0);
140			}
141
142
143			/*
144			* Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
145			*/
146
147			void timer_mac2host_time(tm_time_t &res, int32 mactime)
148			{
149			if (mactime > 0) {
150			// Time in milliseconds
151			res = MSECS2TICKS(mactime);
152			} else {
153			// Time in negative microseconds
154			res = USECS2TICKS(-mactime);
155			}
156			}
157
158
159			/*
160			* Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
161			* A negative input value for hosttime results in a zero return value
162			* As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
163			*/
164
165			int32 timer_host2mac_time(tm_time_t hosttime)
166			{
167			if (hosttime < 0)
168			return 0;
169			else {
170	gbeauche	1.2	uint64 t = TICKS2USECS(hosttime);
171	gbeauche	1.1	if (t > 0x7fffffff)
172			return t / 1000; // Time in milliseconds
173			else
174			return -t; // Time in negative microseconds
175			}
176			}
177
178
179			/*
180			* Get current value of microsecond timer
181			*/
182
183			uint64 GetTicks_usec(void)
184			{
185			LARGE_INTEGER tt;
186			QueryPerformanceCounter(&tt);
187			return TICKS2USECS(tt.QuadPart - mac_boot_ticks);
188			}
189
190
191			/*
192			* Delay by specified number of microseconds (<1 second)
193			*/
194
195			void Delay_usec(uint32 usec)
196			{
197			// FIXME: fortunately, Delay_usec() is generally used with
198			// millisecond resolution anyway
199			Sleep(usec / 1000);
200			}
201	gbeauche	1.5
202
203			/*
204			* Suspend emulator thread, virtual CPU in idle mode
205			*/
206
207	gbeauche	1.6	struct idle_sentinel {
208			idle_sentinel();
209			~idle_sentinel();
210			};
211			static idle_sentinel idle_sentinel;
212
213			static int idle_sem_ok = -1;
214			static HANDLE idle_sem = NULL;
215
216			static HANDLE idle_lock = NULL;
217			#define LOCK_IDLE WaitForSingleObject(idle_lock, INFINITE)
218			#define UNLOCK_IDLE ReleaseMutex(idle_lock)
219
220			idle_sentinel::idle_sentinel()
221			{
222			LOCK_IDLE;
223			idle_sem_ok = 1;
224			if ((idle_sem = CreateSemaphore(0, 0, 1, NULL)) == NULL)
225			idle_sem_ok = 0;
226			if ((idle_lock = CreateMutex(NULL, FALSE, NULL)) == NULL)
227			idle_sem_ok = 0;
228			UNLOCK_IDLE;
229			}
230
231			idle_sentinel::~idle_sentinel()
232			{
233			if (idle_lock) {
234			ReleaseMutex(idle_lock);
235			CloseHandle(idle_lock);
236			}
237			if (idle_sem) {
238			ReleaseSemaphore(idle_sem, 1, NULL);
239			CloseHandle(idle_sem);
240			}
241			}
242
243	gbeauche	1.5	void idle_wait(void)
244			{
245	gbeauche	1.6	LOCK_IDLE;
246			if (idle_sem_ok > 0) {
247			idle_sem_ok++;
248			UNLOCK_IDLE;
249			WaitForSingleObject(idle_sem, INFINITE);
250			return;
251			}
252			UNLOCK_IDLE;
253
254			// Fallback: sleep 10 ms (this should not happen though)
255	gbeauche	1.5	Delay_usec(10000);
256			}
257
258
259			/*
260			* Resume execution of emulator thread, events just arrived
261			*/
262
263			void idle_resume(void)
264			{
265	gbeauche	1.6	LOCK_IDLE;
266			if (idle_sem_ok > 1) {
267			idle_sem_ok--;
268			UNLOCK_IDLE;
269			ReleaseSemaphore(idle_sem, 1, NULL);
270			return;
271			}
272			UNLOCK_IDLE;
273	gbeauche	1.5	}