source: libcfa/src/concurrency/kernel.cfa@ d5d3a90

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since d5d3a90 was 95789be, checked in by Thierry Delisle <tdelisle@…>, 5 years ago

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc
  • Property mode set to 100644
File size: 20.4 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// kernel.c --
8//
9// Author : Thierry Delisle
10// Created On : Tue Jan 17 12:27:26 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Thu Jul 9 06:22:54 2020
13// Update Count : 66
14//
15
16#define __cforall_thread__
17// #define __CFA_DEBUG_PRINT_RUNTIME_CORE__
18
19//C Includes
20#include <errno.h>
21#include <stdio.h>
22#include <signal.h>
23#include <unistd.h>
24
25//CFA Includes
26#include "kernel_private.hfa"
27#include "preemption.hfa"
28
29//Private includes
30#define __CFA_INVOKE_PRIVATE__
31#include "invoke.h"
32
33
34//-----------------------------------------------------------------------------
35// Some assembly required
36#if defined( __i386 )
37 // mxcr : SSE Status and Control bits (control bits are preserved across function calls)
38 // fcw : X87 FPU control word (preserved across function calls)
39 #define __x87_store \
40 uint32_t __mxcr; \
41 uint16_t __fcw; \
42 __asm__ volatile ( \
43 "stmxcsr %0\n" \
44 "fnstcw %1\n" \
45 : "=m" (__mxcr),\
46 "=m" (__fcw) \
47 )
48
49 #define __x87_load \
50 __asm__ volatile ( \
51 "fldcw %1\n" \
52 "ldmxcsr %0\n" \
53 ::"m" (__mxcr),\
54 "m" (__fcw) \
55 )
56
57#elif defined( __x86_64 )
58 #define __x87_store \
59 uint32_t __mxcr; \
60 uint16_t __fcw; \
61 __asm__ volatile ( \
62 "stmxcsr %0\n" \
63 "fnstcw %1\n" \
64 : "=m" (__mxcr),\
65 "=m" (__fcw) \
66 )
67
68 #define __x87_load \
69 __asm__ volatile ( \
70 "fldcw %1\n" \
71 "ldmxcsr %0\n" \
72 :: "m" (__mxcr),\
73 "m" (__fcw) \
74 )
75
76
77#elif defined( __ARM_ARCH )
78#else
79 #error unknown hardware architecture
80#endif
81
82extern $thread * mainThread;
83extern processor * mainProcessor;
84
85//-----------------------------------------------------------------------------
86// Kernel Scheduling logic
87static $thread * __next_thread(cluster * this);
88static bool __has_next_thread(cluster * this);
89static void __run_thread(processor * this, $thread * dst);
90static bool __wake_one(struct __processor_id_t * id, cluster * cltr);
91static void __halt(processor * this);
92bool __wake_proc(processor *);
93
94//=============================================================================================
95// Kernel Scheduling logic
96//=============================================================================================
97//Main of the processor contexts
98void main(processorCtx_t & runner) {
99 // Because of a bug, we couldn't initialized the seed on construction
100 // Do it here
101 kernelTLS.rand_seed ^= rdtscl();
102
103 processor * this = runner.proc;
104 verify(this);
105
106 __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this);
107 #if !defined(__CFA_NO_STATISTICS__)
108 if( this->print_halts ) {
109 __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->id, this->name, (void*)this);
110 }
111 #endif
112
113 {
114 // Setup preemption data
115 preemption_scope scope = { this };
116
117 __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this);
118
119 $thread * readyThread = 0p;
120 for( unsigned int spin_count = 0;; spin_count++ ) {
121 // Try to get the next thread
122 readyThread = __next_thread( this->cltr );
123
124 // Check if we actually found a thread
125 if( readyThread ) {
126 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
127 /* paranoid */ verifyf( readyThread->state == Ready || readyThread->preempted != __NO_PREEMPTION, "state : %d, preempted %d\n", readyThread->state, readyThread->preempted);
128 /* paranoid */ verifyf( readyThread->link.next == 0p, "Expected null got %p", readyThread->link.next );
129 __builtin_prefetch( readyThread->context.SP );
130
131 // We found a thread run it
132 __run_thread(this, readyThread);
133
134 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
135 }
136
137 if(__atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST)) break;
138
139 if( !readyThread ) {
140 // Block until a thread is ready
141 __halt(this);
142 }
143 }
144
145 __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this);
146 }
147
148 V( this->terminated );
149
150 if(this == mainProcessor) {
151 // HACK : the coroutine context switch expects this_thread to be set
152 // and it make sense for it to be set in all other cases except here
153 // fake it
154 kernelTLS.this_thread = mainThread;
155 }
156
157 __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this);
158}
159
160static int * __volatile_errno() __attribute__((noinline));
161static int * __volatile_errno() { asm(""); return &errno; }
162
163// KERNEL ONLY
164// runThread runs a thread by context switching
165// from the processor coroutine to the target thread
166static void __run_thread(processor * this, $thread * thrd_dst) {
167 $coroutine * proc_cor = get_coroutine(this->runner);
168
169 // Update global state
170 kernelTLS.this_thread = thrd_dst;
171
172 // set state of processor coroutine to inactive
173 verify(proc_cor->state == Active);
174 proc_cor->state = Blocked;
175
176 // Actually run the thread
177 RUNNING: while(true) {
178 thrd_dst->preempted = __NO_PREEMPTION;
179 thrd_dst->state = Active;
180
181 __cfaabi_dbg_debug_do(
182 thrd_dst->park_stale = true;
183 thrd_dst->unpark_stale = true;
184 )
185
186 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
187 /* paranoid */ verify( kernelTLS.this_thread == thrd_dst );
188 /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor, "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); // add escape condition if we are setting up the processor
189 /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor, "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); // add escape condition if we are setting up the processor
190
191 // set context switch to the thread that the processor is executing
192 verify( thrd_dst->context.SP );
193 __cfactx_switch( &proc_cor->context, &thrd_dst->context );
194 // when __cfactx_switch returns we are back in the processor coroutine
195
196 /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst );
197 /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst );
198 /* paranoid */ verify( kernelTLS.this_thread == thrd_dst );
199 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
200
201
202 // We just finished running a thread, there are a few things that could have happened.
203 // 1 - Regular case : the thread has blocked and now one has scheduled it yet.
204 // 2 - Racy case : the thread has blocked but someone has already tried to schedule it.
205 // 4 - Preempted
206 // In case 1, we may have won a race so we can't write to the state again.
207 // In case 2, we lost the race so we now own the thread.
208
209 if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) {
210 // The thread was preempted, reschedule it and reset the flag
211 __schedule_thread( (__processor_id_t*)this, thrd_dst );
212 break RUNNING;
213 }
214
215 if(unlikely(thrd_dst->state == Halted)) {
216 // The thread has halted, it should never be scheduled/run again
217 // We may need to wake someone up here since
218 unpark( this->destroyer __cfaabi_dbg_ctx2 );
219 this->destroyer = 0p;
220 break RUNNING;
221 }
222
223 /* paranoid */ verify( thrd_dst->state == Active );
224 thrd_dst->state = Blocked;
225
226 // set state of processor coroutine to active and the thread to inactive
227 int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST);
228 __cfaabi_dbg_debug_do( thrd_dst->park_result = old_ticket; )
229 switch(old_ticket) {
230 case 1:
231 // This is case 1, the regular case, nothing more is needed
232 break RUNNING;
233 case 2:
234 // This is case 2, the racy case, someone tried to run this thread before it finished blocking
235 // In this case, just run it again.
236 continue RUNNING;
237 default:
238 // This makes no sense, something is wrong abort
239 abort();
240 }
241 }
242
243 // Just before returning to the processor, set the processor coroutine to active
244 proc_cor->state = Active;
245 kernelTLS.this_thread = 0p;
246}
247
248// KERNEL_ONLY
249void returnToKernel() {
250 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
251 $coroutine * proc_cor = get_coroutine(kernelTLS.this_processor->runner);
252 $thread * thrd_src = kernelTLS.this_thread;
253
254 #if !defined(__CFA_NO_STATISTICS__)
255 struct processor * last_proc = kernelTLS.this_processor;
256 #endif
257
258 // Run the thread on this processor
259 {
260 int local_errno = *__volatile_errno();
261 #if defined( __i386 ) || defined( __x86_64 )
262 __x87_store;
263 #endif
264 verify( proc_cor->context.SP );
265 __cfactx_switch( &thrd_src->context, &proc_cor->context );
266 #if defined( __i386 ) || defined( __x86_64 )
267 __x87_load;
268 #endif
269 *__volatile_errno() = local_errno;
270 }
271
272 #if !defined(__CFA_NO_STATISTICS__)
273 if(last_proc != kernelTLS.this_processor) {
274 __tls_stats()->ready.threads.migration++;
275 }
276 #endif
277
278 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
279 /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too small.\n", thrd_src );
280 /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too large.\n", thrd_src );
281}
282
283//-----------------------------------------------------------------------------
284// Scheduler routines
285// KERNEL ONLY
286void __schedule_thread( struct __processor_id_t * id, $thread * thrd ) {
287 /* paranoid */ verify( thrd );
288 /* paranoid */ verify( thrd->state != Halted );
289 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
290 /* paranoid */ #if defined( __CFA_WITH_VERIFY__ )
291 /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION,
292 "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted );
293 /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active,
294 "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted );
295 /* paranoid */ #endif
296 /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next );
297
298 if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready;
299
300 ready_schedule_lock ( id );
301 push( thrd->curr_cluster, thrd );
302
303 #if !defined(__CFA_NO_STATISTICS__)
304 bool woke =
305 #endif
306 __wake_one(id, thrd->curr_cluster);
307
308 #if !defined(__CFA_NO_STATISTICS__)
309 if(woke) __tls_stats()->ready.sleep.wakes++;
310 #endif
311 ready_schedule_unlock( id );
312
313 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
314}
315
316// KERNEL ONLY
317static $thread * __next_thread(cluster * this) with( *this ) {
318 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
319
320 ready_schedule_lock ( (__processor_id_t*)kernelTLS.this_processor );
321 $thread * head = pop( this );
322 ready_schedule_unlock( (__processor_id_t*)kernelTLS.this_processor );
323
324 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
325 return head;
326}
327
328// KERNEL ONLY
329static bool __has_next_thread(cluster * this) with( *this ) {
330 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
331
332 ready_schedule_lock ( (__processor_id_t*)kernelTLS.this_processor );
333 bool not_empty = query( this );
334 ready_schedule_unlock( (__processor_id_t*)kernelTLS.this_processor );
335
336 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
337 return not_empty;
338}
339
340// KERNEL ONLY unpark with out disabling interrupts
341void __unpark( struct __processor_id_t * id, $thread * thrd __cfaabi_dbg_ctx_param2 ) {
342 // record activity
343 __cfaabi_dbg_record_thrd( *thrd, false, caller );
344
345 int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST);
346 __cfaabi_dbg_debug_do( thrd->unpark_result = old_ticket; thrd->unpark_state = thrd->state; )
347 switch(old_ticket) {
348 case 1:
349 // Wake won the race, the thread will reschedule/rerun itself
350 break;
351 case 0:
352 /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION );
353 /* paranoid */ verify( thrd->state == Blocked );
354
355 // Wake lost the race,
356 __schedule_thread( id, thrd );
357 break;
358 default:
359 // This makes no sense, something is wrong abort
360 abort();
361 }
362}
363
364void unpark( $thread * thrd __cfaabi_dbg_ctx_param2 ) {
365 if( !thrd ) return;
366
367 disable_interrupts();
368 __unpark( (__processor_id_t*)kernelTLS.this_processor, thrd __cfaabi_dbg_ctx_fwd2 );
369 enable_interrupts( __cfaabi_dbg_ctx );
370}
371
372void park( __cfaabi_dbg_ctx_param ) {
373 /* paranoid */ verify( kernelTLS.preemption_state.enabled );
374 disable_interrupts();
375 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
376 /* paranoid */ verify( kernelTLS.this_thread->preempted == __NO_PREEMPTION );
377
378 // record activity
379 __cfaabi_dbg_record_thrd( *kernelTLS.this_thread, true, caller );
380
381 returnToKernel();
382
383 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
384 enable_interrupts( __cfaabi_dbg_ctx );
385 /* paranoid */ verify( kernelTLS.preemption_state.enabled );
386
387}
388
389// KERNEL ONLY
390void __leave_thread() {
391 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
392 returnToKernel();
393 abort();
394}
395
396// KERNEL ONLY
397bool force_yield( __Preemption_Reason reason ) {
398 /* paranoid */ verify( kernelTLS.preemption_state.enabled );
399 disable_interrupts();
400 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
401
402 $thread * thrd = kernelTLS.this_thread;
403 /* paranoid */ verify(thrd->state == Active);
404
405 // SKULLDUGGERY: It is possible that we are preempting this thread just before
406 // it was going to park itself. If that is the case and it is already using the
407 // intrusive fields then we can't use them to preempt the thread
408 // If that is the case, abandon the preemption.
409 bool preempted = false;
410 if(thrd->link.next == 0p) {
411 preempted = true;
412 thrd->preempted = reason;
413 returnToKernel();
414 }
415
416 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
417 enable_interrupts_noPoll();
418 /* paranoid */ verify( kernelTLS.preemption_state.enabled );
419
420 return preempted;
421}
422
423//=============================================================================================
424// Kernel Idle Sleep
425//=============================================================================================
426// Wake a thread from the front if there are any
427static bool __wake_one(struct __processor_id_t * id, cluster * this) {
428 /* paranoid */ verify( ready_schedule_islocked( id ) );
429
430 // Check if there is a sleeping processor
431 processor * p = pop(this->idles);
432
433 // If no one is sleeping, we are done
434 if( 0p == p ) return false;
435
436 // We found a processor, wake it up
437 post( p->idle );
438
439 return true;
440}
441
442// Unconditionnaly wake a thread
443bool __wake_proc(processor * this) {
444 __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this);
445
446 disable_interrupts();
447 /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
448 bool ret = post( this->idle );
449 enable_interrupts( __cfaabi_dbg_ctx );
450
451 return ret;
452}
453
454static void __halt(processor * this) with( *this ) {
455 if( do_terminate ) return;
456
457 #if !defined(__CFA_NO_STATISTICS__)
458 __tls_stats()->ready.sleep.halts++;
459 #endif
460 // Push self to queue
461 push(cltr->idles, *this);
462
463 // Makre sure we don't miss a thread
464 if( __has_next_thread(cltr) ) {
465 // A thread was posted, make sure a processor is woken up
466 struct __processor_id_t *id = (struct __processor_id_t *) this;
467 ready_schedule_lock ( id );
468 __wake_one( id, cltr );
469 ready_schedule_unlock( id );
470 #if !defined(__CFA_NO_STATISTICS__)
471 __tls_stats()->ready.sleep.cancels++;
472 #endif
473 }
474
475 #if !defined(__CFA_NO_STATISTICS__)
476 if(this->print_halts) {
477 __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->id, rdtscl());
478 }
479 #endif
480
481 wait( idle );
482
483 #if !defined(__CFA_NO_STATISTICS__)
484 if(this->print_halts) {
485 __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->id, rdtscl());
486 }
487 #endif
488}
489
490//=============================================================================================
491// Unexpected Terminating logic
492//=============================================================================================
493static __spinlock_t kernel_abort_lock;
494static bool kernel_abort_called = false;
495
496void * kernel_abort(void) __attribute__ ((__nothrow__)) {
497 // abort cannot be recursively entered by the same or different processors because all signal handlers return when
498 // the globalAbort flag is true.
499 lock( kernel_abort_lock __cfaabi_dbg_ctx2 );
500
501 // first task to abort ?
502 if ( kernel_abort_called ) { // not first task to abort ?
503 unlock( kernel_abort_lock );
504
505 sigset_t mask;
506 sigemptyset( &mask );
507 sigaddset( &mask, SIGALRM ); // block SIGALRM signals
508 sigaddset( &mask, SIGUSR1 ); // block SIGALRM signals
509 sigsuspend( &mask ); // block the processor to prevent further damage during abort
510 _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it
511 }
512 else {
513 kernel_abort_called = true;
514 unlock( kernel_abort_lock );
515 }
516
517 return kernelTLS.this_thread;
518}
519
520void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) {
521 $thread * thrd = ( $thread * ) kernel_data;
522
523 if(thrd) {
524 int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd );
525 __cfaabi_bits_write( STDERR_FILENO, abort_text, len );
526
527 if ( &thrd->self_cor != thrd->curr_cor ) {
528 len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor );
529 __cfaabi_bits_write( STDERR_FILENO, abort_text, len );
530 }
531 else {
532 __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 );
533 }
534 }
535 else {
536 int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" );
537 __cfaabi_bits_write( STDERR_FILENO, abort_text, len );
538 }
539}
540
541int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) {
542 return get_coroutine(kernelTLS.this_thread) == get_coroutine(mainThread) ? 4 : 2;
543}
544
545static __spinlock_t kernel_debug_lock;
546
547extern "C" {
548 void __cfaabi_bits_acquire() {
549 lock( kernel_debug_lock __cfaabi_dbg_ctx2 );
550 }
551
552 void __cfaabi_bits_release() {
553 unlock( kernel_debug_lock );
554 }
555}
556
557//=============================================================================================
558// Kernel Utilities
559//=============================================================================================
560//-----------------------------------------------------------------------------
561// Locks
562void ?{}( semaphore & this, int count = 1 ) {
563 (this.lock){};
564 this.count = count;
565 (this.waiting){};
566}
567void ^?{}(semaphore & this) {}
568
569bool P(semaphore & this) with( this ){
570 lock( lock __cfaabi_dbg_ctx2 );
571 count -= 1;
572 if ( count < 0 ) {
573 // queue current task
574 append( waiting, kernelTLS.this_thread );
575
576 // atomically release spin lock and block
577 unlock( lock );
578 park( __cfaabi_dbg_ctx );
579 return true;
580 }
581 else {
582 unlock( lock );
583 return false;
584 }
585}
586
587bool V(semaphore & this) with( this ) {
588 $thread * thrd = 0p;
589 lock( lock __cfaabi_dbg_ctx2 );
590 count += 1;
591 if ( count <= 0 ) {
592 // remove task at head of waiting list
593 thrd = pop_head( waiting );
594 }
595
596 unlock( lock );
597
598 // make new owner
599 unpark( thrd __cfaabi_dbg_ctx2 );
600
601 return thrd != 0p;
602}
603
604bool V(semaphore & this, unsigned diff) with( this ) {
605 $thread * thrd = 0p;
606 lock( lock __cfaabi_dbg_ctx2 );
607 int release = max(-count, (int)diff);
608 count += diff;
609 for(release) {
610 unpark( pop_head( waiting ) __cfaabi_dbg_ctx2 );
611 }
612
613 unlock( lock );
614
615 return thrd != 0p;
616}
617
618//-----------------------------------------------------------------------------
619// Debug
620__cfaabi_dbg_debug_do(
621 extern "C" {
622 void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) {
623 this.prev_name = prev_name;
624 this.prev_thrd = kernelTLS.this_thread;
625 }
626
627 void __cfaabi_dbg_record_thrd($thread & this, bool park, const char prev_name[]) {
628 if(park) {
629 this.park_caller = prev_name;
630 this.park_stale = false;
631 }
632 else {
633 this.unpark_caller = prev_name;
634 this.unpark_stale = false;
635 }
636 }
637 }
638)
639
640//-----------------------------------------------------------------------------
641// Debug
642bool threading_enabled(void) __attribute__((const)) {
643 return true;
644}
645
646//-----------------------------------------------------------------------------
647// Statistics
648#if !defined(__CFA_NO_STATISTICS__)
649 void print_halts( processor & this ) {
650 this.print_halts = true;
651 }
652#endif
653// Local Variables: //
654// mode: c //
655// tab-width: 4 //
656// End: //
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