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Change missed by the mirror (dotnet/coreclr#26251)
[mono-project.git] / libgc / darwin_stop_world.c
blob9904a3e1d0f17cb8e63f0f0aafaf9e1919f37fd2
1 #include "private/pthread_support.h"
2
3 # if defined(GC_DARWIN_THREADS)
4
5 #include <AvailabilityMacros.h>
6 #include "mono/utils/mono-compiler.h"
7
8 /* From "Inside Mac OS X - Mach-O Runtime Architecture" published by Apple
9 Page 49:
10 "The space beneath the stack pointer, where a new stack frame would normally
11 be allocated, is called the red zone. This area as shown in Figure 3-2 may
12 be used for any purpose as long as a new stack frame does not need to be
13 added to the stack."
14
15 Page 50: "If a leaf procedure's red zone usage would exceed 224 bytes, then
16 it must set up a stack frame just like routines that call other routines."
17 */
18 #ifdef POWERPC
19 # if CPP_WORDSZ == 32
20 # define PPC_RED_ZONE_SIZE 224
21 # elif CPP_WORDSZ == 64
22 # define PPC_RED_ZONE_SIZE 320
23 # endif
24 #endif
25
26 typedef struct StackFrame {
27 unsigned long savedSP;
28 unsigned long savedCR;
29 unsigned long savedLR;
30 unsigned long reserved[2];
31 unsigned long savedRTOC;
32 } StackFrame;
33
34 unsigned long FindTopOfStack(unsigned int stack_start) {
35 StackFrame *frame;
36
37 if (stack_start == 0) {
38 # ifdef POWERPC
39 # if CPP_WORDSZ == 32
40 __asm__ volatile("lwz %0,0(r1)" : "=r" (frame));
41 # else
42 __asm__ volatile("ldz %0,0(r1)" : "=r" (frame));
43 # endif
44 # endif
45 } else {
46 frame = (StackFrame *)stack_start;
47 }
48
49 # ifdef DEBUG_THREADS
50 /* GC_printf1("FindTopOfStack start at sp = %p\n", frame); */
51 # endif
52 do {
53 if (frame->savedSP == 0) break;
54 /* if there are no more stack frames, stop */
55
56 frame = (StackFrame*)frame->savedSP;
57
58 /* we do these next two checks after going to the next frame
59 because the LR for the first stack frame in the loop
60 is not set up on purpose, so we shouldn't check it. */
61 if ((frame->savedLR & ~3) == 0) break; /* if the next LR is bogus, stop */
62 if ((~(frame->savedLR) & ~3) == 0) break; /* ditto */
63 } while (1);
64
65 # ifdef DEBUG_THREADS
66 /* GC_printf1("FindTopOfStack finish at sp = %p\n", frame); */
67 # endif
68
69 return (unsigned long)frame;
70 }
71
72 #ifdef DARWIN_DONT_PARSE_STACK
73 void GC_push_all_stacks() {
74 int i;
75 kern_return_t r;
76 GC_thread p;
77 pthread_t me;
78 ptr_t lo, hi, altstack_lo, altstack_hi;
79 #if defined(POWERPC)
80 ppc_thread_state_t state;
81 mach_msg_type_number_t thread_state_count = PPC_THREAD_STATE_COUNT;
82 #elif defined(I386)
83 i386_thread_state_t state;
84 mach_msg_type_number_t thread_state_count = i386_THREAD_STATE_COUNT;
85 #elif defined(ARM)
86 arm_thread_state_t state;
87 mach_msg_type_number_t thread_state_count = ARM_THREAD_STATE_COUNT;
88 #elif defined(X86_64)
89 x86_thread_state64_t state;
90 mach_msg_type_number_t thread_state_count = x86_THREAD_STATE64_COUNT;
91 #else
92 # error FIXME for non-x86 || ppc architectures
93 mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
94 #endif
95
96 me = pthread_self();
97 if (!GC_thr_initialized) GC_thr_init();
98
99 for(i=0;i<THREAD_TABLE_SZ;i++) {
100 for(p=GC_threads[i];p!=0;p=p->next) {
101 if(p -> flags & FINISHED) continue;
102 if(pthread_equal(p->id,me)) {
103 lo = GC_approx_sp();
104 } else {
105 /* Get the thread state (registers, etc) */
106 r = thread_get_state(
107 p->stop_info.mach_thread,
108 GC_MACH_THREAD_STATE_FLAVOR,
109 (natural_t*)&state,
110 &thread_state_count);
111 if(r != KERN_SUCCESS) continue;
112
113 #if defined(I386)
114 #if defined (TARGET_IOS) || (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5)
115
116 lo = state.__esp;
117
118 GC_push_one(state.__eax);
119 GC_push_one(state.__ebx);
120 GC_push_one(state.__ecx);
121 GC_push_one(state.__edx);
122 GC_push_one(state.__edi);
123 GC_push_one(state.__esi);
124 GC_push_one(state.__ebp);
125 #else
126 lo = state.esp;
127
128 GC_push_one(state.eax);
129 GC_push_one(state.ebx);
130 GC_push_one(state.ecx);
131 GC_push_one(state.edx);
132 GC_push_one(state.edi);
133 GC_push_one(state.esi);
134 GC_push_one(state.ebp);
135 #endif
136 #elif defined(X86_64)
137 lo = state.__rsp;
138 GC_push_one(state.__rax);
139 GC_push_one(state.__rbx);
140 GC_push_one(state.__rcx);
141 GC_push_one(state.__rdx);
142 GC_push_one(state.__rdi);
143 GC_push_one(state.__rsi);
144 GC_push_one(state.__rbp);
145 GC_push_one(state.__r8);
146 GC_push_one(state.__r9);
147 GC_push_one(state.__r10);
148 GC_push_one(state.__r11);
149 GC_push_one(state.__r12);
150 GC_push_one(state.__r13);
151 GC_push_one(state.__r14);
152 GC_push_one(state.__r15);
153 #elif defined(POWERPC)
154 #if defined(_STRUCT_PPC_EXCEPTION_STATE) && defined(__DARWIN_UNIX03)
155 lo = (void*)(state.__r1 - PPC_RED_ZONE_SIZE);
156
157 GC_push_one(state.__r0);
158 GC_push_one(state.__r2);
159 GC_push_one(state.__r3);
160 GC_push_one(state.__r4);
161 GC_push_one(state.__r5);
162 GC_push_one(state.__r6);
163 GC_push_one(state.__r7);
164 GC_push_one(state.__r8);
165 GC_push_one(state.__r9);
166 GC_push_one(state.__r10);
167 GC_push_one(state.__r11);
168 GC_push_one(state.__r12);
169 GC_push_one(state.__r13);
170 GC_push_one(state.__r14);
171 GC_push_one(state.__r15);
172 GC_push_one(state.__r16);
173 GC_push_one(state.__r17);
174 GC_push_one(state.__r18);
175 GC_push_one(state.__r19);
176 GC_push_one(state.__r20);
177 GC_push_one(state.__r21);
178 GC_push_one(state.__r22);
179 GC_push_one(state.__r23);
180 GC_push_one(state.__r24);
181 GC_push_one(state.__r25);
182 GC_push_one(state.__r26);
183 GC_push_one(state.__r27);
184 GC_push_one(state.__r28);
185 GC_push_one(state.__r29);
186 GC_push_one(state.__r30);
187 GC_push_one(state.__r31);
188 #else
189 lo = (void*)(state.r1 - PPC_RED_ZONE_SIZE);
190
191 GC_push_one(state.r0);
192 GC_push_one(state.r2);
193 GC_push_one(state.r3);
194 GC_push_one(state.r4);
195 GC_push_one(state.r5);
196 GC_push_one(state.r6);
197 GC_push_one(state.r7);
198 GC_push_one(state.r8);
199 GC_push_one(state.r9);
200 GC_push_one(state.r10);
201 GC_push_one(state.r11);
202 GC_push_one(state.r12);
203 GC_push_one(state.r13);
204 GC_push_one(state.r14);
205 GC_push_one(state.r15);
206 GC_push_one(state.r16);
207 GC_push_one(state.r17);
208 GC_push_one(state.r18);
209 GC_push_one(state.r19);
210 GC_push_one(state.r20);
211 GC_push_one(state.r21);
212 GC_push_one(state.r22);
213 GC_push_one(state.r23);
214 GC_push_one(state.r24);
215 GC_push_one(state.r25);
216 GC_push_one(state.r26);
217 GC_push_one(state.r27);
218 GC_push_one(state.r28);
219 GC_push_one(state.r29);
220 GC_push_one(state.r30);
221 GC_push_one(state.r31);
222 #endif
223 #elif defined(ARM)
224 lo = (void*)state.__sp;
225
226 GC_push_one(state.__r[0]);
227 GC_push_one(state.__r[1]);
228 GC_push_one(state.__r[2]);
229 GC_push_one(state.__r[3]);
230 GC_push_one(state.__r[4]);
231 GC_push_one(state.__r[5]);
232 GC_push_one(state.__r[6]);
233 GC_push_one(state.__r[7]);
234 GC_push_one(state.__r[8]);
235 GC_push_one(state.__r[9]);
236 GC_push_one(state.__r[10]);
237 GC_push_one(state.__r[11]);
238 GC_push_one(state.__r[12]);
239 /* GC_push_one(state.__sp); */
240 GC_push_one(state.__lr);
241 GC_push_one(state.__pc);
242 GC_push_one(state.__cpsr);
243 #else
244 # error FIXME for non-x86 || ppc architectures
245 #endif
246 } /* p != me */
247 if(p->flags & MAIN_THREAD)
248 hi = GC_stackbottom;
249 else
250 hi = p->stack_end;
251
252 if (p->altstack && lo >= p->altstack && lo <= p->altstack + p->altstack_size) {
253 altstack_lo = lo;
254 altstack_hi = p->altstack + p->altstack_size;
255 lo = (char*)p->stack;
256 hi = (char*)p->stack + p->stack_size;
257 } else {
258 altstack_lo = NULL;
259 }
260
261 #if DEBUG_THREADS
262 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
263 (unsigned long) p -> id,
264 (unsigned long) lo,
265 (unsigned long) hi
266 );
267 #endif
268 if (lo)
269 GC_push_all_stack(lo,hi);
270 if (altstack_lo)
271 GC_push_all_stack(altstack_lo,altstack_hi);
272 } /* for(p=GC_threads[i]...) */
273 } /* for(i=0;i<THREAD_TABLE_SZ...) */
274 }
275
276 #else /* !DARWIN_DONT_PARSE_STACK; Use FindTopOfStack() */
277
278 void GC_push_all_stacks() {
279 int i;
280 task_t my_task;
281 kern_return_t r;
282 mach_port_t me;
283 ptr_t lo, hi;
284 thread_act_array_t act_list = 0;
285 mach_msg_type_number_t listcount = 0;
286
287 me = mach_thread_self();
288 if (!GC_thr_initialized) GC_thr_init();
289
290 my_task = current_task();
291 r = task_threads(my_task, &act_list, &listcount);
292 if(r != KERN_SUCCESS) ABORT("task_threads failed");
293 for(i = 0; i < listcount; i++) {
294 thread_act_t thread = act_list[i];
295 if (thread == me) {
296 lo = GC_approx_sp();
297 hi = (ptr_t)FindTopOfStack(0);
298 } else {
299 # if defined(POWERPC)
300 # if CPP_WORDSZ == 32
301 ppc_thread_state_t info;
302 # else
303 ppc_thread_state64_t info;
304 # endif
305 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
306 r = thread_get_state(thread, GC_MACH_THREAD_STATE_FLAVOR,
307 (natural_t *)&info, &outCount);
308 if(r != KERN_SUCCESS) continue;
309
310 #if defined(_STRUCT_PPC_EXCEPTION_STATE)
311 lo = (void*)(info.__r1 - PPC_RED_ZONE_SIZE);
312 hi = (ptr_t)FindTopOfStack(info.__r1);
313
314 GC_push_one(info.__r0);
315 GC_push_one(info.__r2);
316 GC_push_one(info.__r3);
317 GC_push_one(info.__r4);
318 GC_push_one(info.__r5);
319 GC_push_one(info.__r6);
320 GC_push_one(info.__r7);
321 GC_push_one(info.__r8);
322 GC_push_one(info.__r9);
323 GC_push_one(info.__r10);
324 GC_push_one(info.__r11);
325 GC_push_one(info.__r12);
326 GC_push_one(info.__r13);
327 GC_push_one(info.__r14);
328 GC_push_one(info.__r15);
329 GC_push_one(info.__r16);
330 GC_push_one(info.__r17);
331 GC_push_one(info.__r18);
332 GC_push_one(info.__r19);
333 GC_push_one(info.__r20);
334 GC_push_one(info.__r21);
335 GC_push_one(info.__r22);
336 GC_push_one(info.__r23);
337 GC_push_one(info.__r24);
338 GC_push_one(info.__r25);
339 GC_push_one(info.__r26);
340 GC_push_one(info.__r27);
341 GC_push_one(info.__r28);
342 GC_push_one(info.__r29);
343 GC_push_one(info.__r30);
344 GC_push_one(info.__r31);
345 #else
346 lo = (void*)(info.r1 - PPC_RED_ZONE_SIZE);
347 hi = (ptr_t)FindTopOfStack(info.r1);
348
349 GC_push_one(info.r0);
350 GC_push_one(info.r2);
351 GC_push_one(info.r3);
352 GC_push_one(info.r4);
353 GC_push_one(info.r5);
354 GC_push_one(info.r6);
355 GC_push_one(info.r7);
356 GC_push_one(info.r8);
357 GC_push_one(info.r9);
358 GC_push_one(info.r10);
359 GC_push_one(info.r11);
360 GC_push_one(info.r12);
361 GC_push_one(info.r13);
362 GC_push_one(info.r14);
363 GC_push_one(info.r15);
364 GC_push_one(info.r16);
365 GC_push_one(info.r17);
366 GC_push_one(info.r18);
367 GC_push_one(info.r19);
368 GC_push_one(info.r20);
369 GC_push_one(info.r21);
370 GC_push_one(info.r22);
371 GC_push_one(info.r23);
372 GC_push_one(info.r24);
373 GC_push_one(info.r25);
374 GC_push_one(info.r26);
375 GC_push_one(info.r27);
376 GC_push_one(info.r28);
377 GC_push_one(info.r29);
378 GC_push_one(info.r30);
379 GC_push_one(info.r31);
380 #endif
381 # elif defined(I386) /* !POWERPC */
382 /* FIXME: Remove after testing: */
383 WARN("This is completely untested and likely will not work\n", 0);
384 i386_thread_state_t info;
385 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
386 r = thread_get_state(thread, GC_MACH_THREAD_STATE_FLAVOR,
387 (natural_t *)&info, &outCount);
388 if(r != KERN_SUCCESS) continue;
389
390 #if defined (TARGET_IOS) || (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5)
391 lo = (void*)info.__esp;
392 hi = (ptr_t)FindTopOfStack(info.__esp);
393
394 GC_push_one(info.__eax);
395 GC_push_one(info.__ebx);
396 GC_push_one(info.__ecx);
397 GC_push_one(info.__edx);
398 GC_push_one(info.__edi);
399 GC_push_one(info.__esi);
400 GC_push_one(info.__ebp);
401 /* GC_push_one(info.__esp); */
402 GC_push_one(info.__ss);
403 GC_push_one(info.__eip);
404 GC_push_one(info.__cs);
405 GC_push_one(info.__ds);
406 GC_push_one(info.__es);
407 GC_push_one(info.__fs);
408 GC_push_one(info.__gs);
409 #else
410 lo = (void*)info.esp;
411 hi = (ptr_t)FindTopOfStack(info.esp);
412
413 GC_push_one(info.eax);
414 GC_push_one(info.ebx);
415 GC_push_one(info.ecx);
416 GC_push_one(info.edx);
417 GC_push_one(info.edi);
418 GC_push_one(info.esi);
419 GC_push_one(info.ebp);
420 /* GC_push_one(info.esp); */
421 GC_push_one(info.ss);
422 GC_push_one(info.eip);
423 GC_push_one(info.cs);
424 GC_push_one(info.ds);
425 GC_push_one(info.es);
426 GC_push_one(info.fs);
427 GC_push_one(info.gs);
428 #endif
429 # elif defined(ARM) /* !I386 */
430 arm_thread_state_t info;
431 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
432 r = thread_get_state(thread, GC_MACH_THREAD_STATE_FLAVOR,
433 (natural_t *)&info, &outCount);
434 if(r != KERN_SUCCESS) continue;
435
436 lo = (void*)info.__sp;
437 hi = (ptr_t)FindTopOfStack(info.__sp);
438
439 GC_push_one(info.__r[0]);
440 GC_push_one(info.__r[1]);
441 GC_push_one(info.__r[2]);
442 GC_push_one(info.__r[3]);
443 GC_push_one(info.__r[4]);
444 GC_push_one(info.__r[5]);
445 GC_push_one(info.__r[6]);
446 GC_push_one(info.__r[7]);
447 GC_push_one(info.__r[8]);
448 GC_push_one(info.__r[9]);
449 GC_push_one(info.__r[10]);
450 GC_push_one(info.__r[11]);
451 GC_push_one(info.__r[12]);
452 /* GC_push_one(info.__sp); */
453 GC_push_one(info.__lr);
454 GC_push_one(info.__pc);
455 GC_push_one(info.__cpsr);
456 # endif /* !ARM */
457 }
458 # if DEBUG_THREADS
459 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
460 (unsigned long) thread,
461 (unsigned long) lo,
462 (unsigned long) hi
463 );
464 # endif
465 GC_push_all_stack(lo, hi);
466 mach_port_deallocate(my_task, thread);
467 } /* for(p=GC_threads[i]...) */
468 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
469 mach_port_deallocate(my_task, me);
470 }
471 #endif /* !DARWIN_DONT_PARSE_STACK */
472
473 static mach_port_t GC_mach_handler_thread;
474 static int GC_use_mach_handler_thread = 0;
475
476 #define SUSPEND_THREADS_SIZE 2048
477 static struct GC_mach_thread GC_mach_threads[SUSPEND_THREADS_SIZE];
478 static int GC_mach_threads_count;
479
480 void GC_stop_init() {
481 int i;
482
483 for (i = 0; i < SUSPEND_THREADS_SIZE; i++) {
484 GC_mach_threads[i].thread = 0;
485 GC_mach_threads[i].already_suspended = 0;
486 }
487 GC_mach_threads_count = 0;
488 }
489
490 /* returns true if there's a thread in act_list that wasn't in old_list */
491 int GC_suspend_thread_list(thread_act_array_t act_list, int count,
492 thread_act_array_t old_list, int old_count) {
493 mach_port_t my_thread = mach_thread_self();
494 int i, j;
495
496 int changed = 0;
497
498 for(i = 0; i < count; i++) {
499 thread_act_t thread = act_list[i];
500 # if DEBUG_THREADS
501 GC_printf1("Attempting to suspend thread %p\n", thread);
502 # endif
503 /* find the current thread in the old list */
504 int found = 0;
505 for(j = 0; j < old_count; j++) {
506 thread_act_t old_thread = old_list[j];
507 if (old_thread == thread) {
508 found = 1;
509 break;
510 }
511 }
512 if (!found) {
513 /* add it to the GC_mach_threads list */
514 GC_mach_threads[GC_mach_threads_count].thread = thread;
515 /* default is not suspended */
516 GC_mach_threads[GC_mach_threads_count].already_suspended = 0;
517 changed = 1;
518 }
519
520 if (thread != my_thread &&
521 (!GC_use_mach_handler_thread
522 || (GC_use_mach_handler_thread
523 && GC_mach_handler_thread != thread))) {
524 struct thread_basic_info info;
525 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
526 kern_return_t kern_result = thread_info(thread, THREAD_BASIC_INFO,
527 (thread_info_t)&info, &outCount);
528 if(kern_result != KERN_SUCCESS) {
529 /* the thread may have quit since the thread_threads () call
530 * we mark already_suspended so it's not dealt with anymore later
531 */
532 if (!found) {
533 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
534 GC_mach_threads_count++;
535 }
536 continue;
537 }
538 # if DEBUG_THREADS
539 GC_printf2("Thread state for 0x%lx = %d\n", thread, info.run_state);
540 # endif
541 if (!found) {
542 GC_mach_threads[GC_mach_threads_count].already_suspended = info.suspend_count;
543 }
544 if (info.suspend_count) continue;
545
546 # if DEBUG_THREADS
547 GC_printf1("Suspending 0x%lx\n", thread);
548 # endif
549 /* Suspend the thread */
550 kern_result = thread_suspend(thread);
551 if(kern_result != KERN_SUCCESS) {
552 /* the thread may have quit since the thread_threads () call
553 * we mark already_suspended so it's not dealt with anymore later
554 */
555 if (!found) {
556 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
557 GC_mach_threads_count++;
558 }
559 continue;
560 }
561 }
562 if (!found) GC_mach_threads_count++;
563 }
564
565 mach_port_deallocate(current_task(), my_thread);
566 return changed;
567 }
568
569
570 /* Caller holds allocation lock. */
571 void GC_stop_world()
572 {
573 int i, changes;
574 GC_thread p;
575 task_t my_task = current_task();
576 mach_port_t my_thread = mach_thread_self();
577 kern_return_t kern_result;
578 thread_act_array_t act_list, prev_list;
579 mach_msg_type_number_t listcount, prevcount;
580
581 if (GC_notify_event)
582 GC_notify_event (GC_EVENT_PRE_STOP_WORLD);
583 GC_process_togglerefs ();
584
585 # if DEBUG_THREADS
586 GC_printf1("Stopping the world from 0x%lx\n", mach_thread_self());
587 # endif
588
589 /* clear out the mach threads list table */
590 GC_stop_init();
591
592 /* Make sure all free list construction has stopped before we start. */
593 /* No new construction can start, since free list construction is */
594 /* required to acquire and release the GC lock before it starts, */
595 /* and we have the lock. */
596 # ifdef PARALLEL_MARK
597 GC_acquire_mark_lock();
598 GC_ASSERT(GC_fl_builder_count == 0);
599 /* We should have previously waited for it to become zero. */
600 # endif /* PARALLEL_MARK */
601
602 /* Loop stopping threads until you have gone over the whole list
603 twice without a new one appearing. thread_create() won't
604 return (and thus the thread stop) until the new thread
605 exists, so there is no window whereby you could stop a
606 thread, recognise it is stopped, but then have a new thread
607 it created before stopping show up later.
608 */
609
610 changes = 1;
611 prev_list = NULL;
612 prevcount = 0;
613 do {
614 int result;
615 kern_result = task_threads(my_task, &act_list, &listcount);
616
617 if(kern_result == KERN_SUCCESS) {
618 result = GC_suspend_thread_list(act_list, listcount,
619 prev_list, prevcount);
620 changes = result;
621
622 if(prev_list != NULL) {
623 for(i = 0; i < prevcount; i++)
624 mach_port_deallocate(my_task, prev_list[i]);
625
626 vm_deallocate(my_task, (vm_address_t)prev_list, sizeof(thread_t) * prevcount);
627 }
628
629 prev_list = act_list;
630 prevcount = listcount;
631 }
632 } while (changes);
633
634 for(i = 0; i < listcount; i++)
635 mach_port_deallocate(my_task, act_list[i]);
636
637 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
638
639
640 # ifdef MPROTECT_VDB
641 if(GC_incremental) {
642 extern void GC_mprotect_stop();
643 GC_mprotect_stop();
644 }
645 # endif
646
647 # ifdef PARALLEL_MARK
648 GC_release_mark_lock();
649 # endif
650 #if DEBUG_THREADS
651 GC_printf1("World stopped from 0x%lx\n", my_thread);
652 #endif
653
654 mach_port_deallocate(my_task, my_thread);
655
656 if (GC_notify_event)
657 GC_notify_event (GC_EVENT_POST_STOP_WORLD);
658 }
659
660 /* Caller holds allocation lock, and has held it continuously since */
661 /* the world stopped. */
662 void GC_start_world()
663 {
664 task_t my_task = current_task();
665 mach_port_t my_thread = mach_thread_self();
666 int i, j;
667 GC_thread p;
668 kern_return_t kern_result;
669 thread_act_array_t act_list;
670 mach_msg_type_number_t listcount;
671 struct thread_basic_info info;
672 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
673
674 if (GC_notify_event)
675 GC_notify_event (GC_EVENT_PRE_START_WORLD);
676
677 # if DEBUG_THREADS
678 GC_printf0("World starting\n");
679 # endif
680
681 # ifdef MPROTECT_VDB
682 if(GC_incremental) {
683 extern void GC_mprotect_resume();
684 GC_mprotect_resume();
685 }
686 # endif
687
688 kern_result = task_threads(my_task, &act_list, &listcount);
689 for(i = 0; i < listcount; i++) {
690 thread_act_t thread = act_list[i];
691 if (thread != my_thread &&
692 (!GC_use_mach_handler_thread ||
693 (GC_use_mach_handler_thread && GC_mach_handler_thread != thread))) {
694 for(j = 0; j < GC_mach_threads_count; j++) {
695 if (thread == GC_mach_threads[j].thread) {
696 if (GC_mach_threads[j].already_suspended) {
697 # if DEBUG_THREADS
698 GC_printf1("Not resuming already suspended thread %p\n", thread);
699 # endif
700 continue;
701 }
702 kern_result = thread_info(thread, THREAD_BASIC_INFO,
703 (thread_info_t)&info, &outCount);
704 if(kern_result != KERN_SUCCESS) continue;
705 # if DEBUG_THREADS
706 GC_printf2("Thread state for 0x%lx = %d\n", thread,
707 info.run_state);
708 GC_printf1("Resuming 0x%lx\n", thread);
709 # endif
710 /* Resume the thread */
711 kern_result = thread_resume(thread);
712 if(kern_result != KERN_SUCCESS) continue;
713 }
714 }
715 }
716
717 mach_port_deallocate(my_task, thread);
718 }
719 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
720
721 mach_port_deallocate(my_task, my_thread);
722
723 if (GC_notify_event)
724 GC_notify_event (GC_EVENT_POST_START_WORLD);
725
726 # if DEBUG_THREADS
727 GC_printf0("World started\n");
728 # endif
729 }
730
731 void GC_darwin_register_mach_handler_thread(mach_port_t thread) {
732 GC_mach_handler_thread = thread;
733 GC_use_mach_handler_thread = 1;
734 }
735
736 #endif
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