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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) 1997-2004 Christian Bauer |
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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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// 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 TICKS2MSECS(TICKS) (((uint64)(TICKS) * 1000) / frequency) |
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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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* Initialize native Windows timers |
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*/ |
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void SysTimerInit(void) |
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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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if (hosttime < 0) |
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return 0; |
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else { |
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uint64 t = TICKS2MSECS(hosttime); |
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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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// 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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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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} |
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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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} |
