| 1 |
/* |
| 2 |
* timer.cpp - Time Manager emulation |
| 3 |
* |
| 4 |
* SheepShaver (C) 1997-2008 Christian Bauer and Marc Hellwig |
| 5 |
* |
| 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 |
#include "timer.h" |
| 23 |
#include "macos_util.h" |
| 24 |
#include "main.h" |
| 25 |
#include "cpu_emulation.h" |
| 26 |
|
| 27 |
#ifdef PRECISE_TIMING_POSIX |
| 28 |
#include <pthread.h> |
| 29 |
#include <semaphore.h> |
| 30 |
#endif |
| 31 |
|
| 32 |
#define DEBUG 0 |
| 33 |
#include "debug.h" |
| 34 |
|
| 35 |
|
| 36 |
#define TM_QUEUE 0 // Enable TMQueue management (doesn't work) |
| 37 |
|
| 38 |
|
| 39 |
// Definitions for Time Manager |
| 40 |
enum { // TMTask struct |
| 41 |
tmAddr = 6, |
| 42 |
tmCount = 10, |
| 43 |
tmWakeUp = 14, |
| 44 |
tmReserved = 18 |
| 45 |
}; |
| 46 |
|
| 47 |
|
| 48 |
// Array of additional info for each installed TMTask |
| 49 |
struct TMDesc { |
| 50 |
uint32 task; // Mac address of associated TMTask |
| 51 |
tm_time_t wakeup; // Time this task is scheduled for execution |
| 52 |
bool in_use; // Flag: descriptor in use |
| 53 |
}; |
| 54 |
|
| 55 |
const int NUM_DESCS = 64; // Maximum number of descriptors |
| 56 |
static TMDesc desc[NUM_DESCS]; |
| 57 |
|
| 58 |
#if PRECISE_TIMING |
| 59 |
#ifdef PRECISE_TIMING_BEOS |
| 60 |
static thread_id timer_thread = -1; |
| 61 |
static bool thread_active = true; |
| 62 |
static const tm_time_t wakeup_time_max = 0x7fffffffffffffff; |
| 63 |
static volatile tm_time_t wakeup_time = wakeup_time_max; |
| 64 |
static sem_id wakeup_time_sem = -1; |
| 65 |
static int32 timer_func(void *arg); |
| 66 |
#endif |
| 67 |
#ifdef PRECISE_TIMING_POSIX |
| 68 |
static pthread_t timer_thread; |
| 69 |
static bool timer_thread_active = false; |
| 70 |
static volatile bool timer_thread_cancel = false; |
| 71 |
static tm_time_t wakeup_time_max = { 0x7fffffff, 999999999 }; |
| 72 |
static tm_time_t wakeup_time = wakeup_time_max; |
| 73 |
static pthread_mutex_t wakeup_time_lock = PTHREAD_MUTEX_INITIALIZER; |
| 74 |
static void *timer_func(void *arg); |
| 75 |
#endif |
| 76 |
#endif |
| 77 |
|
| 78 |
|
| 79 |
/* |
| 80 |
* Allocate descriptor for given TMTask in list |
| 81 |
*/ |
| 82 |
|
| 83 |
static int alloc_desc(uint32 tm) |
| 84 |
{ |
| 85 |
// Search for first free descriptor |
| 86 |
for (int i=0; i<NUM_DESCS; i++) |
| 87 |
if (!desc[i].in_use) { |
| 88 |
desc[i].task = tm; |
| 89 |
desc[i].in_use = true; |
| 90 |
return i; |
| 91 |
} |
| 92 |
return -1; |
| 93 |
} |
| 94 |
|
| 95 |
|
| 96 |
/* |
| 97 |
* Free descriptor in list |
| 98 |
*/ |
| 99 |
|
| 100 |
inline static void free_desc(int i) |
| 101 |
{ |
| 102 |
desc[i].in_use = false; |
| 103 |
} |
| 104 |
|
| 105 |
|
| 106 |
/* |
| 107 |
* Find descriptor associated with given TMTask |
| 108 |
*/ |
| 109 |
|
| 110 |
inline static int find_desc(uint32 tm) |
| 111 |
{ |
| 112 |
for (int i=0; i<NUM_DESCS; i++) |
| 113 |
if (desc[i].in_use && desc[i].task == tm) |
| 114 |
return i; |
| 115 |
return -1; |
| 116 |
} |
| 117 |
|
| 118 |
|
| 119 |
/* |
| 120 |
* Enqueue task in Time Manager queue |
| 121 |
*/ |
| 122 |
|
| 123 |
static void enqueue_tm(uint32 tm) |
| 124 |
{ |
| 125 |
#if TM_QUEUE |
| 126 |
uint32 tm_var = ReadMacInt32(0xb30); |
| 127 |
WriteMacInt32(tm + qLink, ReadMacInt32(tm_var)); |
| 128 |
WriteMacInt32(tm_var, tm); |
| 129 |
#endif |
| 130 |
} |
| 131 |
|
| 132 |
|
| 133 |
/* |
| 134 |
* Remove task from Time Manager queue |
| 135 |
*/ |
| 136 |
|
| 137 |
static void dequeue_tm(uint32 tm) |
| 138 |
{ |
| 139 |
#if TM_QUEUE |
| 140 |
uint32 p = ReadMacInt32(0xb30); |
| 141 |
while (p) { |
| 142 |
uint32 next = ReadMacInt32(p + qLink); |
| 143 |
if (next == tm) { |
| 144 |
WriteMacInt32(p + qLink, ReadMacInt32(next + qLink)); |
| 145 |
return; |
| 146 |
} |
| 147 |
} |
| 148 |
#endif |
| 149 |
} |
| 150 |
|
| 151 |
|
| 152 |
/* |
| 153 |
* Timer thread operations |
| 154 |
*/ |
| 155 |
|
| 156 |
#ifdef PRECISE_TIMING_POSIX |
| 157 |
const int SIGSUSPEND = SIGRTMIN + 6; |
| 158 |
const int SIGRESUME = SIGRTMIN + 7; |
| 159 |
static struct sigaction sigsuspend_action; |
| 160 |
static struct sigaction sigresume_action; |
| 161 |
|
| 162 |
static int suspend_count = 0; |
| 163 |
static pthread_mutex_t suspend_count_lock = PTHREAD_MUTEX_INITIALIZER; |
| 164 |
static sem_t suspend_ack_sem; |
| 165 |
static sigset_t suspend_handler_mask; |
| 166 |
|
| 167 |
// Signal handler for suspended thread |
| 168 |
static void sigsuspend_handler(int sig) |
| 169 |
{ |
| 170 |
sem_post(&suspend_ack_sem); |
| 171 |
sigsuspend(&suspend_handler_mask); |
| 172 |
} |
| 173 |
|
| 174 |
// Signal handler for resumed thread |
| 175 |
static void sigresume_handler(int sig) |
| 176 |
{ |
| 177 |
/* simply trigger a signal to stop clock_nanosleep() */ |
| 178 |
} |
| 179 |
|
| 180 |
// Initialize timer thread |
| 181 |
static bool timer_thread_init(void) |
| 182 |
{ |
| 183 |
// Install suspend signal handler |
| 184 |
sigemptyset(&sigsuspend_action.sa_mask); |
| 185 |
sigaddset(&sigsuspend_action.sa_mask, SIGRESUME); |
| 186 |
sigsuspend_action.sa_handler = sigsuspend_handler; |
| 187 |
sigsuspend_action.sa_flags = SA_RESTART; |
| 188 |
#ifdef HAVE_SIGNAL_SA_RESTORER |
| 189 |
sigsuspend_action.sa_restorer = NULL; |
| 190 |
#endif |
| 191 |
if (sigaction(SIGSUSPEND, &sigsuspend_action, NULL) < 0) |
| 192 |
return false; |
| 193 |
|
| 194 |
// Install resume signal handler |
| 195 |
sigemptyset(&sigresume_action.sa_mask); |
| 196 |
sigresume_action.sa_handler = sigresume_handler; |
| 197 |
sigresume_action.sa_flags = SA_RESTART; |
| 198 |
#ifdef HAVE_SIGNAL_SA_RESTORER |
| 199 |
sigresume_action.sa_restorer = NULL; |
| 200 |
#endif |
| 201 |
if (sigaction(SIGRESUME, &sigresume_action, NULL) < 0) |
| 202 |
return false; |
| 203 |
|
| 204 |
// Initialize semaphore |
| 205 |
if (sem_init(&suspend_ack_sem, 0, 0) < 0) |
| 206 |
return false; |
| 207 |
|
| 208 |
// Initialize suspend_handler_mask, it excludes SIGRESUME |
| 209 |
if (sigfillset(&suspend_handler_mask) != 0) |
| 210 |
return false; |
| 211 |
if (sigdelset(&suspend_handler_mask, SIGRESUME) != 0) |
| 212 |
return false; |
| 213 |
|
| 214 |
// Create thread in running state |
| 215 |
suspend_count = 0; |
| 216 |
return (pthread_create(&timer_thread, NULL, timer_func, NULL) == 0); |
| 217 |
} |
| 218 |
|
| 219 |
// Kill timer thread |
| 220 |
static void timer_thread_kill(void) |
| 221 |
{ |
| 222 |
timer_thread_cancel = true; |
| 223 |
#ifdef HAVE_PTHREAD_CANCEL |
| 224 |
pthread_cancel(timer_thread); |
| 225 |
#endif |
| 226 |
pthread_join(timer_thread, NULL); |
| 227 |
} |
| 228 |
|
| 229 |
// Suspend timer thread |
| 230 |
static void timer_thread_suspend(void) |
| 231 |
{ |
| 232 |
pthread_mutex_lock(&suspend_count_lock); |
| 233 |
if (suspend_count == 0) { |
| 234 |
suspend_count ++; |
| 235 |
if (pthread_kill(timer_thread, SIGSUSPEND) == 0) |
| 236 |
sem_wait(&suspend_ack_sem); |
| 237 |
} |
| 238 |
pthread_mutex_unlock(&suspend_count_lock); |
| 239 |
} |
| 240 |
|
| 241 |
// Resume timer thread |
| 242 |
static void timer_thread_resume(void) |
| 243 |
{ |
| 244 |
pthread_mutex_lock(&suspend_count_lock); |
| 245 |
assert(suspend_count > 0); |
| 246 |
if (suspend_count == 1) { |
| 247 |
suspend_count = 0; |
| 248 |
pthread_kill(timer_thread, SIGRESUME); |
| 249 |
} |
| 250 |
pthread_mutex_unlock(&suspend_count_lock); |
| 251 |
} |
| 252 |
#endif |
| 253 |
|
| 254 |
|
| 255 |
/* |
| 256 |
* Initialize Time Manager |
| 257 |
*/ |
| 258 |
|
| 259 |
void TimerInit(void) |
| 260 |
{ |
| 261 |
// Mark all descriptors as inactive |
| 262 |
for (int i=0; i<NUM_DESCS; i++) |
| 263 |
free_desc(i); |
| 264 |
|
| 265 |
#if PRECISE_TIMING |
| 266 |
// Start timer thread |
| 267 |
#ifdef PRECISE_TIMING_BEOS |
| 268 |
wakeup_time_sem = create_sem(1, "Wakeup Time"); |
| 269 |
timer_thread = spawn_thread(timer_func, "Time Manager", B_REAL_TIME_PRIORITY, NULL); |
| 270 |
resume_thread(timer_thread); |
| 271 |
#endif |
| 272 |
#ifdef PRECISE_TIMING_POSIX |
| 273 |
timer_thread_active = timer_thread_init(); |
| 274 |
#endif |
| 275 |
#endif |
| 276 |
} |
| 277 |
|
| 278 |
|
| 279 |
/* |
| 280 |
* Exit Time Manager |
| 281 |
*/ |
| 282 |
|
| 283 |
void TimerExit(void) |
| 284 |
{ |
| 285 |
#if PRECISE_TIMING |
| 286 |
// Quit timer thread |
| 287 |
if (timer_thread > 0) { |
| 288 |
#ifdef PRECISE_TIMING_BEOS |
| 289 |
status_t l; |
| 290 |
thread_active = false; |
| 291 |
suspend_thread(timer_thread); |
| 292 |
resume_thread(timer_thread); |
| 293 |
wait_for_thread(timer_thread, &l); |
| 294 |
delete_sem(wakeup_time_sem); |
| 295 |
#endif |
| 296 |
#ifdef PRECISE_TIMING_POSIX |
| 297 |
timer_thread_kill(); |
| 298 |
#endif |
| 299 |
} |
| 300 |
#endif |
| 301 |
} |
| 302 |
|
| 303 |
|
| 304 |
/* |
| 305 |
* Emulator reset, remove all timer tasks |
| 306 |
*/ |
| 307 |
|
| 308 |
void TimerReset(void) |
| 309 |
{ |
| 310 |
// Mark all descriptors as inactive |
| 311 |
for (int i=0; i<NUM_DESCS; i++) |
| 312 |
free_desc(i); |
| 313 |
} |
| 314 |
|
| 315 |
|
| 316 |
/* |
| 317 |
* Insert timer task |
| 318 |
*/ |
| 319 |
|
| 320 |
int16 InsTime(uint32 tm, uint16 trap) |
| 321 |
{ |
| 322 |
D(bug("InsTime %08lx, trap %04x\n", tm, trap)); |
| 323 |
WriteMacInt16((uint32)tm + qType, ReadMacInt16((uint32)tm + qType) & 0x1fff | (trap << 4) & 0x6000); |
| 324 |
if (find_desc(tm) >= 0) |
| 325 |
printf("WARNING: InsTime(): Task re-inserted\n"); |
| 326 |
else { |
| 327 |
int i = alloc_desc(tm); |
| 328 |
if (i < 0) |
| 329 |
printf("FATAL: InsTime(): No free Time Manager descriptor\n"); |
| 330 |
} |
| 331 |
return 0; |
| 332 |
} |
| 333 |
|
| 334 |
|
| 335 |
/* |
| 336 |
* Remove timer task |
| 337 |
*/ |
| 338 |
|
| 339 |
int16 RmvTime(uint32 tm) |
| 340 |
{ |
| 341 |
D(bug("RmvTime %08lx\n", tm)); |
| 342 |
|
| 343 |
// Find descriptor |
| 344 |
int i = find_desc(tm); |
| 345 |
if (i < 0) { |
| 346 |
printf("WARNING: RmvTime(%08lx): Descriptor not found\n", tm); |
| 347 |
return 0; |
| 348 |
} |
| 349 |
|
| 350 |
// Task active? |
| 351 |
#if PRECISE_TIMING_BEOS |
| 352 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
| 353 |
suspend_thread(timer_thread); |
| 354 |
#endif |
| 355 |
#if PRECISE_TIMING_POSIX |
| 356 |
timer_thread_suspend(); |
| 357 |
pthread_mutex_lock(&wakeup_time_lock); |
| 358 |
#endif |
| 359 |
if (ReadMacInt16(tm + qType) & 0x8000) { |
| 360 |
|
| 361 |
// Yes, make task inactive and remove it from the Time Manager queue |
| 362 |
WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff); |
| 363 |
dequeue_tm(tm); |
| 364 |
#if PRECISE_TIMING |
| 365 |
// Look for next task to be called and set wakeup_time |
| 366 |
wakeup_time = wakeup_time_max; |
| 367 |
for (int j=0; j<NUM_DESCS; j++) { |
| 368 |
if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000)) |
| 369 |
if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0) |
| 370 |
wakeup_time = desc[j].wakeup; |
| 371 |
} |
| 372 |
#endif |
| 373 |
|
| 374 |
// Compute remaining time |
| 375 |
tm_time_t remaining, current; |
| 376 |
timer_current_time(current); |
| 377 |
timer_sub_time(remaining, desc[i].wakeup, current); |
| 378 |
WriteMacInt32(tm + tmCount, timer_host2mac_time(remaining)); |
| 379 |
} else |
| 380 |
WriteMacInt32(tm + tmCount, 0); |
| 381 |
D(bug(" tmCount %ld\n", ReadMacInt32(tm + tmCount))); |
| 382 |
#if PRECISE_TIMING_BEOS |
| 383 |
release_sem(wakeup_time_sem); |
| 384 |
thread_info info; |
| 385 |
do { |
| 386 |
resume_thread(timer_thread); // This will unblock the thread |
| 387 |
get_thread_info(timer_thread, &info); |
| 388 |
} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?) |
| 389 |
#endif |
| 390 |
#if PRECISE_TIMING_POSIX |
| 391 |
pthread_mutex_unlock(&wakeup_time_lock); |
| 392 |
timer_thread_resume(); |
| 393 |
assert(suspend_count == 0); |
| 394 |
#endif |
| 395 |
|
| 396 |
// Free descriptor |
| 397 |
free_desc(i); |
| 398 |
return 0; |
| 399 |
} |
| 400 |
|
| 401 |
|
| 402 |
/* |
| 403 |
* Start timer task |
| 404 |
*/ |
| 405 |
|
| 406 |
int16 PrimeTime(uint32 tm, int32 time) |
| 407 |
{ |
| 408 |
D(bug("PrimeTime %08lx, time %ld\n", tm, time)); |
| 409 |
|
| 410 |
// Find descriptor |
| 411 |
int i = find_desc(tm); |
| 412 |
if (i < 0) { |
| 413 |
printf("FATAL: PrimeTime(): Descriptor not found\n"); |
| 414 |
return 0; |
| 415 |
} |
| 416 |
|
| 417 |
// Convert delay time |
| 418 |
tm_time_t delay; |
| 419 |
timer_mac2host_time(delay, time); |
| 420 |
|
| 421 |
// Extended task? |
| 422 |
if (ReadMacInt16(tm + qType) & 0x4000) { |
| 423 |
|
| 424 |
// Yes, tmWakeUp set? |
| 425 |
if (ReadMacInt32(tm + tmWakeUp)) { |
| 426 |
|
| 427 |
// PrimeTime(0) can either mean (a) "the task runs as soon as interrupts are enabled" |
| 428 |
// or (b) "continue previous delay" if an expired task was stopped via RmvTime() and |
| 429 |
// then re-installed using InsXTime(). Since tmWakeUp was set, this is case (b). |
| 430 |
// The remaining time was saved in tmCount by RmvTime(). |
| 431 |
timer_mac2host_time(delay, ReadMacInt16(tm + tmCount)); |
| 432 |
|
| 433 |
// Yes, calculate wakeup time relative to last scheduled time |
| 434 |
tm_time_t wakeup; |
| 435 |
timer_add_time(wakeup, desc[i].wakeup, delay); |
| 436 |
desc[i].wakeup = wakeup; |
| 437 |
|
| 438 |
} else { |
| 439 |
|
| 440 |
// No, calculate wakeup time relative to current time |
| 441 |
tm_time_t now; |
| 442 |
timer_current_time(now); |
| 443 |
timer_add_time(desc[i].wakeup, now, delay); |
| 444 |
} |
| 445 |
|
| 446 |
// Set tmWakeUp to indicate that task was scheduled |
| 447 |
WriteMacInt32(tm + tmWakeUp, 0x12345678); |
| 448 |
|
| 449 |
} else { |
| 450 |
|
| 451 |
// Not extended task, calculate wakeup time relative to current time |
| 452 |
tm_time_t now; |
| 453 |
timer_current_time(now); |
| 454 |
timer_add_time(desc[i].wakeup, now, delay); |
| 455 |
} |
| 456 |
|
| 457 |
// Make task active and enqueue it in the Time Manager queue |
| 458 |
#if PRECISE_TIMING_BEOS |
| 459 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
| 460 |
suspend_thread(timer_thread); |
| 461 |
#endif |
| 462 |
#if PRECISE_TIMING_POSIX |
| 463 |
timer_thread_suspend(); |
| 464 |
pthread_mutex_lock(&wakeup_time_lock); |
| 465 |
#endif |
| 466 |
WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) | 0x8000); |
| 467 |
enqueue_tm(tm); |
| 468 |
#if PRECISE_TIMING |
| 469 |
// Look for next task to be called and set wakeup_time |
| 470 |
wakeup_time = wakeup_time_max; |
| 471 |
for (int j=0; j<NUM_DESCS; j++) { |
| 472 |
if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000)) |
| 473 |
if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0) |
| 474 |
wakeup_time = desc[j].wakeup; |
| 475 |
} |
| 476 |
#ifdef PRECISE_TIMING_BEOS |
| 477 |
release_sem(wakeup_time_sem); |
| 478 |
thread_info info; |
| 479 |
do { |
| 480 |
resume_thread(timer_thread); // This will unblock the thread |
| 481 |
get_thread_info(timer_thread, &info); |
| 482 |
} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?) |
| 483 |
#endif |
| 484 |
#ifdef PRECISE_TIMING_POSIX |
| 485 |
pthread_mutex_unlock(&wakeup_time_lock); |
| 486 |
timer_thread_resume(); |
| 487 |
assert(suspend_count == 0); |
| 488 |
#endif |
| 489 |
#endif |
| 490 |
return 0; |
| 491 |
} |
| 492 |
|
| 493 |
|
| 494 |
/* |
| 495 |
* Time Manager thread |
| 496 |
*/ |
| 497 |
|
| 498 |
#ifdef PRECISE_TIMING_BEOS |
| 499 |
static int32 timer_func(void *arg) |
| 500 |
{ |
| 501 |
while (thread_active) { |
| 502 |
|
| 503 |
// Wait until time specified by wakeup_time |
| 504 |
snooze_until(wakeup_time, B_SYSTEM_TIMEBASE); |
| 505 |
|
| 506 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
| 507 |
if (wakeup_time < system_time()) { |
| 508 |
|
| 509 |
// Timer expired, trigger interrupt |
| 510 |
wakeup_time = 0x7fffffffffffffff; |
| 511 |
SetInterruptFlag(INTFLAG_TIMER); |
| 512 |
TriggerInterrupt(); |
| 513 |
} |
| 514 |
release_sem(wakeup_time_sem); |
| 515 |
} |
| 516 |
return 0; |
| 517 |
} |
| 518 |
#endif |
| 519 |
|
| 520 |
#ifdef PRECISE_TIMING_POSIX |
| 521 |
static void *timer_func(void *arg) |
| 522 |
{ |
| 523 |
while (!timer_thread_cancel) { |
| 524 |
|
| 525 |
// Wait until time specified by wakeup_time |
| 526 |
clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &wakeup_time, NULL); |
| 527 |
|
| 528 |
tm_time_t system_time; |
| 529 |
timer_current_time(system_time); |
| 530 |
if (timer_cmp_time(wakeup_time, system_time) < 0) { |
| 531 |
|
| 532 |
// Timer expired, trigger interrupt |
| 533 |
pthread_mutex_lock(&wakeup_time_lock); |
| 534 |
wakeup_time = wakeup_time_max; |
| 535 |
pthread_mutex_unlock(&wakeup_time_lock); |
| 536 |
SetInterruptFlag(INTFLAG_TIMER); |
| 537 |
TriggerInterrupt(); |
| 538 |
} |
| 539 |
} |
| 540 |
return NULL; |
| 541 |
} |
| 542 |
#endif |
| 543 |
|
| 544 |
|
| 545 |
/* |
| 546 |
* Timer interrupt function (executed as part of 60Hz interrupt) |
| 547 |
*/ |
| 548 |
|
| 549 |
void TimerInterrupt(void) |
| 550 |
{ |
| 551 |
// D(bug("TimerIRQ\n")); |
| 552 |
|
| 553 |
// Look for active TMTasks that have expired |
| 554 |
tm_time_t now; |
| 555 |
timer_current_time(now); |
| 556 |
for (int i=0; i<NUM_DESCS; i++) |
| 557 |
if (desc[i].in_use) { |
| 558 |
uint32 tm = desc[i].task; |
| 559 |
if ((ReadMacInt16(tm + qType) & 0x8000) && timer_cmp_time(desc[i].wakeup, now) <= 0) { |
| 560 |
|
| 561 |
// Found one, mark as inactive and remove it from the Time Manager queue |
| 562 |
WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff); |
| 563 |
dequeue_tm(tm); |
| 564 |
|
| 565 |
// Call timer function |
| 566 |
uint32 addr = ReadMacInt32(tm + tmAddr); |
| 567 |
if (addr) { |
| 568 |
D(bug("Calling TimeTask %08lx, addr %08lx\n", tm, addr)); |
| 569 |
M68kRegisters r; |
| 570 |
r.a[0] = addr; |
| 571 |
r.a[1] = tm; |
| 572 |
Execute68k(r.a[0], &r); |
| 573 |
D(bug(" returned from TimeTask\n")); |
| 574 |
} |
| 575 |
} |
| 576 |
} |
| 577 |
|
| 578 |
#if PRECISE_TIMING |
| 579 |
// Look for next task to be called and set wakeup_time |
| 580 |
#if PRECISE_TIMING_BEOS |
| 581 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
| 582 |
suspend_thread(timer_thread); |
| 583 |
#endif |
| 584 |
#if PRECISE_TIMING_POSIX |
| 585 |
timer_thread_suspend(); |
| 586 |
pthread_mutex_lock(&wakeup_time_lock); |
| 587 |
#endif |
| 588 |
wakeup_time = wakeup_time_max; |
| 589 |
for (int j=0; j<NUM_DESCS; j++) { |
| 590 |
if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000)) |
| 591 |
if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0) |
| 592 |
wakeup_time = desc[j].wakeup; |
| 593 |
} |
| 594 |
#if PRECISE_TIMING_BEOS |
| 595 |
release_sem(wakeup_time_sem); |
| 596 |
thread_info info; |
| 597 |
do { |
| 598 |
resume_thread(timer_thread); // This will unblock the thread |
| 599 |
get_thread_info(timer_thread, &info); |
| 600 |
} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?) |
| 601 |
#endif |
| 602 |
#if PRECISE_TIMING_POSIX |
| 603 |
pthread_mutex_unlock(&wakeup_time_lock); |
| 604 |
timer_thread_resume(); |
| 605 |
assert(suspend_count == 0); |
| 606 |
#endif |
| 607 |
#endif |
| 608 |
} |
