source: libcfa/src/concurrency/kernel.cfa @ 95789be

arm-ehjacob/cs343-translationnew-astnew-ast-unique-expr
Last change on this file since 95789be was 95789be, checked in by Thierry Delisle <tdelisle@…>, 16 months ago

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

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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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