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/* |
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* timer_windows.cpp - Time Manager emulation, Windows specific stuff |
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* |
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* Basilisk II (C) 1997-2005 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "sysdeps.h" |
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|
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#define WIN32_LEAN_AND_MEAN |
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#include <windows.h> |
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|
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#include "main.h" |
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#include "macos_util.h" |
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#include "timer.h" |
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|
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#define DEBUG 0 |
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#include "debug.h" |
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|
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|
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// Helper time functions |
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#define MSECS2TICKS(MSECS) (((uint64)(MSECS) * frequency) / 1000) |
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#define USECS2TICKS(USECS) (((uint64)(USECS) * frequency) / 1000000) |
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#define TICKS2USECS(TICKS) (((uint64)(TICKS) * 1000000) / frequency) |
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|
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// From main_windows.cpp |
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extern HANDLE emul_thread; |
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|
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// Global variables |
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static uint32 frequency; // CPU frequency in Hz (< 4 GHz) |
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static tm_time_t mac_boot_ticks; |
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static tm_time_t mac_1904_ticks; |
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static tm_time_t mac_now_diff; |
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|
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|
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/* |
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* Initialize native Windows timers |
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*/ |
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|
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void timer_init(void) |
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{ |
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D(bug("SysTimerInit\n")); |
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|
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LARGE_INTEGER tt; |
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if (!QueryPerformanceFrequency(&tt)) { |
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ErrorAlert("No high resolution timers available\n"); |
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QuitEmulator(); |
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} |
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frequency = tt.LowPart; |
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D(bug(" frequency %d\n", frequency)); |
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|
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// mac_boot_ticks is 1.18 us since Basilisk II was started |
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QueryPerformanceCounter(&tt); |
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mac_boot_ticks = tt.QuadPart; |
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|
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// mac_1904_ticks is 1.18 us since Mac time started 1904 |
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mac_1904_ticks = time(NULL) * frequency; |
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mac_now_diff = mac_1904_ticks - mac_boot_ticks; |
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} |
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|
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|
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/* |
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* Return microseconds since boot (64 bit) |
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*/ |
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|
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void Microseconds(uint32 &hi, uint32 &lo) |
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{ |
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D(bug("Microseconds\n")); |
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LARGE_INTEGER tt; |
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QueryPerformanceCounter(&tt); |
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tt.QuadPart = TICKS2USECS(tt.QuadPart - mac_boot_ticks); |
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hi = tt.HighPart; |
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lo = tt.LowPart; |
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} |
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|
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|
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/* |
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* Return local date/time in Mac format (seconds since 1.1.1904) |
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*/ |
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|
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uint32 TimerDateTime(void) |
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{ |
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return TimeToMacTime(time(NULL)); |
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} |
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|
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|
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/* |
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* Get current time |
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*/ |
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|
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void timer_current_time(tm_time_t &t) |
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{ |
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LARGE_INTEGER tt; |
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QueryPerformanceCounter(&tt); |
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t = tt.QuadPart + mac_now_diff; |
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} |
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|
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|
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/* |
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* Add times |
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*/ |
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|
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void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b) |
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{ |
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res = a + b; |
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} |
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|
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|
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/* |
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* Subtract times |
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*/ |
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|
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void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b) |
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{ |
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res = a - b; |
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} |
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|
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|
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/* |
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* Compare times (<0: a < b, =0: a = b, >0: a > b) |
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*/ |
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|
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int timer_cmp_time(tm_time_t a, tm_time_t b) |
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{ |
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tm_time_t r = a - b; |
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return r < 0 ? -1 : (r > 0 ? 1 : 0); |
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} |
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|
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|
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/* |
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* Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t |
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*/ |
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|
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void timer_mac2host_time(tm_time_t &res, int32 mactime) |
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{ |
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if (mactime > 0) { |
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// Time in milliseconds |
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res = MSECS2TICKS(mactime); |
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} else { |
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// Time in negative microseconds |
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res = USECS2TICKS(-mactime); |
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} |
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} |
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|
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|
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/* |
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* Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds) |
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* A negative input value for hosttime results in a zero return value |
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* As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds! |
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*/ |
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|
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int32 timer_host2mac_time(tm_time_t hosttime) |
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{ |
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if (hosttime < 0) |
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return 0; |
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else { |
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uint64 t = TICKS2USECS(hosttime); |
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if (t > 0x7fffffff) |
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return t / 1000; // Time in milliseconds |
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else |
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return -t; // Time in negative microseconds |
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} |
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} |
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|
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|
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/* |
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* Get current value of microsecond timer |
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*/ |
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|
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uint64 GetTicks_usec(void) |
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{ |
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LARGE_INTEGER tt; |
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QueryPerformanceCounter(&tt); |
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return TICKS2USECS(tt.QuadPart - mac_boot_ticks); |
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} |
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|
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|
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/* |
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* Delay by specified number of microseconds (<1 second) |
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*/ |
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|
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void Delay_usec(uint32 usec) |
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{ |
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// FIXME: fortunately, Delay_usec() is generally used with |
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// millisecond resolution anyway |
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Sleep(usec / 1000); |
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} |
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|
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|
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/* |
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* Suspend emulator thread, virtual CPU in idle mode |
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*/ |
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|
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struct idle_sentinel { |
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idle_sentinel(); |
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~idle_sentinel(); |
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}; |
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static idle_sentinel idle_sentinel; |
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|
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static int idle_sem_ok = -1; |
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static HANDLE idle_sem = NULL; |
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|
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static HANDLE idle_lock = NULL; |
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#define LOCK_IDLE WaitForSingleObject(idle_lock, INFINITE) |
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#define UNLOCK_IDLE ReleaseMutex(idle_lock) |
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|
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idle_sentinel::idle_sentinel() |
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{ |
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LOCK_IDLE; |
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idle_sem_ok = 1; |
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if ((idle_sem = CreateSemaphore(0, 0, 1, NULL)) == NULL) |
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idle_sem_ok = 0; |
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if ((idle_lock = CreateMutex(NULL, FALSE, NULL)) == NULL) |
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idle_sem_ok = 0; |
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UNLOCK_IDLE; |
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} |
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|
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idle_sentinel::~idle_sentinel() |
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{ |
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if (idle_lock) { |
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ReleaseMutex(idle_lock); |
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CloseHandle(idle_lock); |
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} |
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if (idle_sem) { |
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ReleaseSemaphore(idle_sem, 1, NULL); |
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CloseHandle(idle_sem); |
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} |
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} |
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|
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void idle_wait(void) |
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{ |
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LOCK_IDLE; |
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if (idle_sem_ok > 0) { |
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idle_sem_ok++; |
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UNLOCK_IDLE; |
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WaitForSingleObject(idle_sem, INFINITE); |
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return; |
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} |
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UNLOCK_IDLE; |
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|
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// Fallback: sleep 10 ms (this should not happen though) |
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Delay_usec(10000); |
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} |
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|
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|
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/* |
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* Resume execution of emulator thread, events just arrived |
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*/ |
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|
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void idle_resume(void) |
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{ |
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LOCK_IDLE; |
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if (idle_sem_ok > 1) { |
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idle_sem_ok--; |
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UNLOCK_IDLE; |
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ReleaseSemaphore(idle_sem, 1, NULL); |
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return; |
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} |
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UNLOCK_IDLE; |
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} |
