source: src/libcfa/concurrency/monitor.c@ 643c6b9

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum with_gc
Last change on this file since 643c6b9 was b10affd, checked in by Peter A. Buhr <pabuhr@…>, 7 years ago

thread-local storage converted to structure and thread-local macros for access
  • Property mode set to 100644
File size: 28.8 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// monitor_desc.c --
8//
9// Author : Thierry Delisle
10// Created On : Thd Feb 23 12:27:26 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Mar 30 14:30:26 2018
13// Update Count : 9
14//
15
16#include "monitor"
17
18#include <stdlib>
19#include <inttypes.h>
20
21#include "kernel_private.h"
22
23#include "bits/algorithms.h"
24
25//-----------------------------------------------------------------------------
26// Forward declarations
27static inline void set_owner ( monitor_desc * this, thread_desc * owner );
28static inline void set_owner ( monitor_desc * storage [], __lock_size_t count, thread_desc * owner );
29static inline void set_mask ( monitor_desc * storage [], __lock_size_t count, const __waitfor_mask_t & mask );
30static inline void reset_mask( monitor_desc * this );
31
32static inline thread_desc * next_thread( monitor_desc * this );
33static inline bool is_accepted( monitor_desc * this, const __monitor_group_t & monitors );
34
35static inline void lock_all ( __spinlock_t * locks [], __lock_size_t count );
36static inline void lock_all ( monitor_desc * source [], __spinlock_t * /*out*/ locks [], __lock_size_t count );
37static inline void unlock_all( __spinlock_t * locks [], __lock_size_t count );
38static inline void unlock_all( monitor_desc * locks [], __lock_size_t count );
39
40static inline void save ( monitor_desc * ctx [], __lock_size_t count, __spinlock_t * locks [], unsigned int /*out*/ recursions [], __waitfor_mask_t /*out*/ masks [] );
41static inline void restore( monitor_desc * ctx [], __lock_size_t count, __spinlock_t * locks [], unsigned int /*in */ recursions [], __waitfor_mask_t /*in */ masks [] );
42
43static inline void init ( __lock_size_t count, monitor_desc * monitors [], __condition_node_t & waiter, __condition_criterion_t criteria [] );
44static inline void init_push( __lock_size_t count, monitor_desc * monitors [], __condition_node_t & waiter, __condition_criterion_t criteria [] );
45
46static inline thread_desc * check_condition ( __condition_criterion_t * );
47static inline void brand_condition ( condition & );
48static inline [thread_desc *, int] search_entry_queue( const __waitfor_mask_t &, monitor_desc * monitors [], __lock_size_t count );
49
50forall(dtype T | sized( T ))
51static inline __lock_size_t insert_unique( T * array [], __lock_size_t & size, T * val );
52static inline __lock_size_t count_max ( const __waitfor_mask_t & mask );
53static inline __lock_size_t aggregate ( monitor_desc * storage [], const __waitfor_mask_t & mask );
54
55//-----------------------------------------------------------------------------
56// Useful defines
57#define wait_ctx(thrd, user_info) /* Create the necessary information to use the signaller stack */ \
58 __condition_node_t waiter = { thrd, count, user_info }; /* Create the node specific to this wait operation */ \
59 __condition_criterion_t criteria[count]; /* Create the creteria this wait operation needs to wake up */ \
60 init( count, monitors, waiter, criteria ); /* Link everything together */ \
61
62#define wait_ctx_primed(thrd, user_info) /* Create the necessary information to use the signaller stack */ \
63 __condition_node_t waiter = { thrd, count, user_info }; /* Create the node specific to this wait operation */ \
64 __condition_criterion_t criteria[count]; /* Create the creteria this wait operation needs to wake up */ \
65 init_push( count, monitors, waiter, criteria ); /* Link everything together and push it to the AS-Stack */ \
66
67#define monitor_ctx( mons, cnt ) /* Define that create the necessary struct for internal/external scheduling operations */ \
68 monitor_desc ** monitors = mons; /* Save the targeted monitors */ \
69 __lock_size_t count = cnt; /* Save the count to a local variable */ \
70 unsigned int recursions[ count ]; /* Save the current recursion levels to restore them later */ \
71 __waitfor_mask_t masks [ count ]; /* Save the current waitfor masks to restore them later */ \
72 __spinlock_t * locks [ count ]; /* We need to pass-in an array of locks to BlockInternal */ \
73
74#define monitor_save save ( monitors, count, locks, recursions, masks )
75#define monitor_restore restore( monitors, count, locks, recursions, masks )
76
77
78//-----------------------------------------------------------------------------
79// Enter/Leave routines
80
81
82extern "C" {
83 // Enter single monitor
84 static void __enter_monitor_desc( monitor_desc * this, const __monitor_group_t & group ) {
85 // Lock the monitor spinlock
86 lock( this->lock __cfaabi_dbg_ctx2 );
87 thread_desc * thrd = TL_GET( this_thread );
88
89 __cfaabi_dbg_print_safe( "Kernel : %10p Entering mon %p (%p)\n", thrd, this, this->owner);
90
91 if( !this->owner ) {
92 // No one has the monitor, just take it
93 set_owner( this, thrd );
94
95 __cfaabi_dbg_print_safe( "Kernel : mon is free \n" );
96 }
97 else if( this->owner == thrd) {
98 // We already have the monitor, just note how many times we took it
99 this->recursion += 1;
100
101 __cfaabi_dbg_print_safe( "Kernel : mon already owned \n" );
102 }
103 else if( is_accepted( this, group) ) {
104 // Some one was waiting for us, enter
105 set_owner( this, thrd );
106
107 // Reset mask
108 reset_mask( this );
109
110 __cfaabi_dbg_print_safe( "Kernel : mon accepts \n" );
111 }
112 else {
113 __cfaabi_dbg_print_safe( "Kernel : blocking \n" );
114
115 // Some one else has the monitor, wait in line for it
116 append( this->entry_queue, thrd );
117
118 BlockInternal( &this->lock );
119
120 __cfaabi_dbg_print_safe( "Kernel : %10p Entered mon %p\n", thrd, this);
121
122 // BlockInternal will unlock spinlock, no need to unlock ourselves
123 return;
124 }
125
126 __cfaabi_dbg_print_safe( "Kernel : %10p Entered mon %p\n", thrd, this);
127
128 // Release the lock and leave
129 unlock( this->lock );
130 return;
131 }
132
133 static void __enter_monitor_dtor( monitor_desc * this, fptr_t func ) {
134 // Lock the monitor spinlock
135 lock( this->lock __cfaabi_dbg_ctx2 );
136 thread_desc * thrd = TL_GET( this_thread );
137
138 __cfaabi_dbg_print_safe( "Kernel : %10p Entering dtor for mon %p (%p)\n", thrd, this, this->owner);
139
140
141 if( !this->owner ) {
142 __cfaabi_dbg_print_safe( "Kernel : Destroying free mon %p\n", this);
143
144 // No one has the monitor, just take it
145 set_owner( this, thrd );
146
147 unlock( this->lock );
148 return;
149 }
150 else if( this->owner == thrd) {
151 // We already have the monitor... but where about to destroy it so the nesting will fail
152 // Abort!
153 abort( "Attempt to destroy monitor %p by thread \"%.256s\" (%p) in nested mutex.", this, thrd->self_cor.name, thrd );
154 }
155
156 __lock_size_t count = 1;
157 monitor_desc ** monitors = &this;
158 __monitor_group_t group = { &this, 1, func };
159 if( is_accepted( this, group) ) {
160 __cfaabi_dbg_print_safe( "Kernel : mon accepts dtor, block and signal it \n" );
161
162 // Wake the thread that is waiting for this
163 __condition_criterion_t * urgent = pop( this->signal_stack );
164 verify( urgent );
165
166 // Reset mask
167 reset_mask( this );
168
169 // Create the node specific to this wait operation
170 wait_ctx_primed( TL_GET( this_thread ), 0 )
171
172 // Some one else has the monitor, wait for him to finish and then run
173 BlockInternal( &this->lock, urgent->owner->waiting_thread );
174
175 // Some one was waiting for us, enter
176 set_owner( this, thrd );
177 }
178 else {
179 __cfaabi_dbg_print_safe( "Kernel : blocking \n" );
180
181 wait_ctx( TL_GET( this_thread ), 0 )
182 this->dtor_node = &waiter;
183
184 // Some one else has the monitor, wait in line for it
185 append( this->entry_queue, thrd );
186 BlockInternal( &this->lock );
187
188 // BlockInternal will unlock spinlock, no need to unlock ourselves
189 return;
190 }
191
192 __cfaabi_dbg_print_safe( "Kernel : Destroying %p\n", this);
193
194 }
195
196 // Leave single monitor
197 void __leave_monitor_desc( monitor_desc * this ) {
198 // Lock the monitor spinlock
199 lock( this->lock __cfaabi_dbg_ctx2 );
200
201 __cfaabi_dbg_print_safe( "Kernel : %10p Leaving mon %p (%p)\n", TL_GET( this_thread ), this, this->owner);
202
203 verifyf( TL_GET( this_thread ) == this->owner, "Expected owner to be %p, got %p (r: %i, m: %p)", TL_GET( this_thread ), this->owner, this->recursion, this );
204
205 // Leaving a recursion level, decrement the counter
206 this->recursion -= 1;
207
208 // If we haven't left the last level of recursion
209 // it means we don't need to do anything
210 if( this->recursion != 0) {
211 __cfaabi_dbg_print_safe( "Kernel : recursion still %d\n", this->recursion);
212 unlock( this->lock );
213 return;
214 }
215
216 // Get the next thread, will be null on low contention monitor
217 thread_desc * new_owner = next_thread( this );
218
219 // We can now let other threads in safely
220 unlock( this->lock );
221
222 //We need to wake-up the thread
223 WakeThread( new_owner );
224 }
225
226 // Leave single monitor for the last time
227 void __leave_dtor_monitor_desc( monitor_desc * this ) {
228 __cfaabi_dbg_debug_do(
229 if( TL_GET( this_thread ) != this->owner ) {
230 abort( "Destroyed monitor %p has inconsistent owner, expected %p got %p.\n", this, TL_GET( this_thread ), this->owner);
231 }
232 if( this->recursion != 1 ) {
233 abort( "Destroyed monitor %p has %d outstanding nested calls.\n", this, this->recursion - 1);
234 }
235 )
236 }
237
238 // Leave the thread monitor
239 // last routine called by a thread.
240 // Should never return
241 void __leave_thread_monitor( thread_desc * thrd ) {
242 monitor_desc * this = &thrd->self_mon;
243
244 // Lock the monitor now
245 lock( this->lock __cfaabi_dbg_ctx2 );
246
247 disable_interrupts();
248
249 thrd->self_cor.state = Halted;
250
251 verifyf( thrd == this->owner, "Expected owner to be %p, got %p (r: %i, m: %p)", thrd, this->owner, this->recursion, this );
252
253 // Leaving a recursion level, decrement the counter
254 this->recursion -= 1;
255
256 // If we haven't left the last level of recursion
257 // it must mean there is an error
258 if( this->recursion != 0) { abort( "Thread internal monitor has unbalanced recursion" ); }
259
260 // Fetch the next thread, can be null
261 thread_desc * new_owner = next_thread( this );
262
263 // Leave the thread, this will unlock the spinlock
264 // Use leave thread instead of BlockInternal which is
265 // specialized for this case and supports null new_owner
266 LeaveThread( &this->lock, new_owner );
267
268 // Control flow should never reach here!
269 }
270}
271
272// Enter multiple monitor
273// relies on the monitor array being sorted
274static inline void enter( __monitor_group_t monitors ) {
275 for( __lock_size_t i = 0; i < monitors.size; i++) {
276 __enter_monitor_desc( monitors[i], monitors );
277 }
278}
279
280// Leave multiple monitor
281// relies on the monitor array being sorted
282static inline void leave(monitor_desc * monitors [], __lock_size_t count) {
283 for( __lock_size_t i = count - 1; i >= 0; i--) {
284 __leave_monitor_desc( monitors[i] );
285 }
286}
287
288// Ctor for monitor guard
289// Sorts monitors before entering
290void ?{}( monitor_guard_t & this, monitor_desc * m [], __lock_size_t count, fptr_t func ) {
291 // Store current array
292 this.m = m;
293 this.count = count;
294
295 // Sort monitors based on address -> TODO use a sort specialized for small numbers
296 __libcfa_small_sort(this.m, count);
297
298 // Save previous thread context
299 this.prev = TL_GET( this_thread )->monitors;
300
301 // Update thread context (needed for conditions)
302 (TL_GET( this_thread )->monitors){m, count, func};
303
304 // __cfaabi_dbg_print_safe( "MGUARD : enter %d\n", count);
305
306 // Enter the monitors in order
307 __monitor_group_t group = {this.m, this.count, func};
308 enter( group );
309
310 // __cfaabi_dbg_print_safe( "MGUARD : entered\n" );
311}
312
313
314// Dtor for monitor guard
315void ^?{}( monitor_guard_t & this ) {
316 // __cfaabi_dbg_print_safe( "MGUARD : leaving %d\n", this.count);
317
318 // Leave the monitors in order
319 leave( this.m, this.count );
320
321 // __cfaabi_dbg_print_safe( "MGUARD : left\n" );
322
323 // Restore thread context
324 TL_GET( this_thread )->monitors = this.prev;
325}
326
327// Ctor for monitor guard
328// Sorts monitors before entering
329void ?{}( monitor_dtor_guard_t & this, monitor_desc * m [], fptr_t func ) {
330 // Store current array
331 this.m = *m;
332
333 // Save previous thread context
334 this.prev = TL_GET( this_thread )->monitors;
335
336 // Update thread context (needed for conditions)
337 (TL_GET( this_thread )->monitors){m, 1, func};
338
339 __enter_monitor_dtor( this.m, func );
340}
341
342// Dtor for monitor guard
343void ^?{}( monitor_dtor_guard_t & this ) {
344 // Leave the monitors in order
345 __leave_dtor_monitor_desc( this.m );
346
347 // Restore thread context
348 TL_GET( this_thread )->monitors = this.prev;
349}
350
351//-----------------------------------------------------------------------------
352// Internal scheduling types
353void ?{}(__condition_node_t & this, thread_desc * waiting_thread, __lock_size_t count, uintptr_t user_info ) {
354 this.waiting_thread = waiting_thread;
355 this.count = count;
356 this.next = NULL;
357 this.user_info = user_info;
358}
359
360void ?{}(__condition_criterion_t & this ) with( this ) {
361 ready = false;
362 target = NULL;
363 owner = NULL;
364 next = NULL;
365}
366
367void ?{}(__condition_criterion_t & this, monitor_desc * target, __condition_node_t & owner ) {
368 this.ready = false;
369 this.target = target;
370 this.owner = &owner;
371 this.next = NULL;
372}
373
374//-----------------------------------------------------------------------------
375// Internal scheduling
376void wait( condition & this, uintptr_t user_info = 0 ) {
377 brand_condition( this );
378
379 // Check that everything is as expected
380 assertf( this.monitors != NULL, "Waiting with no monitors (%p)", this.monitors );
381 verifyf( this.monitor_count != 0, "Waiting with 0 monitors (%"PRIiFAST16")", this.monitor_count );
382 verifyf( this.monitor_count < 32u, "Excessive monitor count (%"PRIiFAST16")", this.monitor_count );
383
384 // Create storage for monitor context
385 monitor_ctx( this.monitors, this.monitor_count );
386
387 // Create the node specific to this wait operation
388 wait_ctx( TL_GET( this_thread ), user_info );
389
390 // Append the current wait operation to the ones already queued on the condition
391 // We don't need locks for that since conditions must always be waited on inside monitor mutual exclusion
392 append( this.blocked, &waiter );
393
394 // Lock all monitors (aggregates the locks as well)
395 lock_all( monitors, locks, count );
396
397 // Find the next thread(s) to run
398 __lock_size_t thread_count = 0;
399 thread_desc * threads[ count ];
400 __builtin_memset( threads, 0, sizeof( threads ) );
401
402 // Save monitor states
403 monitor_save;
404
405 // Remove any duplicate threads
406 for( __lock_size_t i = 0; i < count; i++) {
407 thread_desc * new_owner = next_thread( monitors[i] );
408 insert_unique( threads, thread_count, new_owner );
409 }
410
411 // Everything is ready to go to sleep
412 BlockInternal( locks, count, threads, thread_count );
413
414 // We are back, restore the owners and recursions
415 monitor_restore;
416}
417
418bool signal( condition & this ) {
419 if( is_empty( this ) ) { return false; }
420
421 //Check that everything is as expected
422 verify( this.monitors );
423 verify( this.monitor_count != 0 );
424
425 //Some more checking in debug
426 __cfaabi_dbg_debug_do(
427 thread_desc * this_thrd = TL_GET( this_thread );
428 if ( this.monitor_count != this_thrd->monitors.size ) {
429 abort( "Signal on condition %p made with different number of monitor(s), expected %zi got %zi", &this, this.monitor_count, this_thrd->monitors.size );
430 }
431
432 for(int i = 0; i < this.monitor_count; i++) {
433 if ( this.monitors[i] != this_thrd->monitors[i] ) {
434 abort( "Signal on condition %p made with different monitor, expected %p got %p", &this, this.monitors[i], this_thrd->monitors[i] );
435 }
436 }
437 );
438
439 __lock_size_t count = this.monitor_count;
440
441 // Lock all monitors
442 lock_all( this.monitors, NULL, count );
443
444 //Pop the head of the waiting queue
445 __condition_node_t * node = pop_head( this.blocked );
446
447 //Add the thread to the proper AS stack
448 for(int i = 0; i < count; i++) {
449 __condition_criterion_t * crit = &node->criteria[i];
450 assert( !crit->ready );
451 push( crit->target->signal_stack, crit );
452 }
453
454 //Release
455 unlock_all( this.monitors, count );
456
457 return true;
458}
459
460bool signal_block( condition & this ) {
461 if( !this.blocked.head ) { return false; }
462
463 //Check that everything is as expected
464 verifyf( this.monitors != NULL, "Waiting with no monitors (%p)", this.monitors );
465 verifyf( this.monitor_count != 0, "Waiting with 0 monitors (%"PRIiFAST16")", this.monitor_count );
466
467 // Create storage for monitor context
468 monitor_ctx( this.monitors, this.monitor_count );
469
470 // Lock all monitors (aggregates the locks them as well)
471 lock_all( monitors, locks, count );
472
473
474 // Create the node specific to this wait operation
475 wait_ctx_primed( TL_GET( this_thread ), 0 )
476
477 //save contexts
478 monitor_save;
479
480 //Find the thread to run
481 thread_desc * signallee = pop_head( this.blocked )->waiting_thread;
482 set_owner( monitors, count, signallee );
483
484 __cfaabi_dbg_print_buffer_decl( "Kernel : signal_block condition %p (s: %p)\n", &this, signallee );
485
486 //Everything is ready to go to sleep
487 BlockInternal( locks, count, &signallee, 1 );
488
489
490 // WE WOKE UP
491
492
493 __cfaabi_dbg_print_buffer_local( "Kernel : signal_block returned\n" );
494
495 //We are back, restore the masks and recursions
496 monitor_restore;
497
498 return true;
499}
500
501// Access the user_info of the thread waiting at the front of the queue
502uintptr_t front( condition & this ) {
503 verifyf( !is_empty(this),
504 "Attempt to access user data on an empty condition.\n"
505 "Possible cause is not checking if the condition is empty before reading stored data."
506 );
507 return ((typeof(this.blocked.head))this.blocked.head)->user_info;
508}
509
510//-----------------------------------------------------------------------------
511// External scheduling
512// cases to handle :
513// - target already there :
514// block and wake
515// - dtor already there
516// put thread on signaller stack
517// - non-blocking
518// return else
519// - timeout
520// return timeout
521// - block
522// setup mask
523// block
524void __waitfor_internal( const __waitfor_mask_t & mask, int duration ) {
525 // This statment doesn't have a contiguous list of monitors...
526 // Create one!
527 __lock_size_t max = count_max( mask );
528 monitor_desc * mon_storage[max];
529 __builtin_memset( mon_storage, 0, sizeof( mon_storage ) );
530 __lock_size_t actual_count = aggregate( mon_storage, mask );
531
532 __cfaabi_dbg_print_buffer_decl( "Kernel : waitfor %"PRIdFAST16" (s: %"PRIdFAST16", m: %"PRIdFAST16")\n", actual_count, mask.size, (__lock_size_t)max);
533
534 if(actual_count == 0) return;
535
536 __cfaabi_dbg_print_buffer_local( "Kernel : waitfor internal proceeding\n" );
537
538 // Create storage for monitor context
539 monitor_ctx( mon_storage, actual_count );
540
541 // Lock all monitors (aggregates the locks as well)
542 lock_all( monitors, locks, count );
543
544 {
545 // Check if the entry queue
546 thread_desc * next; int index;
547 [next, index] = search_entry_queue( mask, monitors, count );
548
549 if( next ) {
550 *mask.accepted = index;
551 __acceptable_t& accepted = mask[index];
552 if( accepted.is_dtor ) {
553 __cfaabi_dbg_print_buffer_local( "Kernel : dtor already there\n" );
554 verifyf( accepted.size == 1, "ERROR: Accepted dtor has more than 1 mutex parameter." );
555
556 monitor_desc * mon2dtor = accepted[0];
557 verifyf( mon2dtor->dtor_node, "ERROR: Accepted monitor has no dtor_node." );
558
559 __condition_criterion_t * dtor_crit = mon2dtor->dtor_node->criteria;
560 push( mon2dtor->signal_stack, dtor_crit );
561
562 unlock_all( locks, count );
563 }
564 else {
565 __cfaabi_dbg_print_buffer_local( "Kernel : thread present, baton-passing\n" );
566
567 // Create the node specific to this wait operation
568 wait_ctx_primed( TL_GET( this_thread ), 0 );
569
570 // Save monitor states
571 monitor_save;
572
573 __cfaabi_dbg_print_buffer_local( "Kernel : baton of %"PRIdFAST16" monitors : ", count );
574 #ifdef __CFA_DEBUG_PRINT__
575 for( int i = 0; i < count; i++) {
576 __cfaabi_dbg_print_buffer_local( "%p %p ", monitors[i], monitors[i]->signal_stack.top );
577 }
578 #endif
579 __cfaabi_dbg_print_buffer_local( "\n" );
580
581 // Set the owners to be the next thread
582 set_owner( monitors, count, next );
583
584 // Everything is ready to go to sleep
585 BlockInternal( locks, count, &next, 1 );
586
587 // We are back, restore the owners and recursions
588 monitor_restore;
589
590 __cfaabi_dbg_print_buffer_local( "Kernel : thread present, returned\n" );
591 }
592
593 __cfaabi_dbg_print_buffer_local( "Kernel : accepted %d\n", *mask.accepted);
594 return;
595 }
596 }
597
598
599 if( duration == 0 ) {
600 __cfaabi_dbg_print_buffer_local( "Kernel : non-blocking, exiting\n" );
601
602 unlock_all( locks, count );
603
604 __cfaabi_dbg_print_buffer_local( "Kernel : accepted %d\n", *mask.accepted);
605 return;
606 }
607
608
609 verifyf( duration < 0, "Timeout on waitfor statments not supported yet." );
610
611 __cfaabi_dbg_print_buffer_local( "Kernel : blocking waitfor\n" );
612
613 // Create the node specific to this wait operation
614 wait_ctx_primed( TL_GET( this_thread ), 0 );
615
616 monitor_save;
617 set_mask( monitors, count, mask );
618
619 for( __lock_size_t i = 0; i < count; i++) {
620 verify( monitors[i]->owner == TL_GET( this_thread ) );
621 }
622
623 //Everything is ready to go to sleep
624 BlockInternal( locks, count );
625
626
627 // WE WOKE UP
628
629
630 //We are back, restore the masks and recursions
631 monitor_restore;
632
633 __cfaabi_dbg_print_buffer_local( "Kernel : exiting\n" );
634
635 __cfaabi_dbg_print_buffer_local( "Kernel : accepted %d\n", *mask.accepted);
636}
637
638//-----------------------------------------------------------------------------
639// Utilities
640
641static inline void set_owner( monitor_desc * this, thread_desc * owner ) {
642 // __cfaabi_dbg_print_safe( "Kernal : Setting owner of %p to %p ( was %p)\n", this, owner, this->owner );
643
644 //Pass the monitor appropriately
645 this->owner = owner;
646
647 //We are passing the monitor to someone else, which means recursion level is not 0
648 this->recursion = owner ? 1 : 0;
649}
650
651static inline void set_owner( monitor_desc * monitors [], __lock_size_t count, thread_desc * owner ) {
652 monitors[0]->owner = owner;
653 monitors[0]->recursion = 1;
654 for( __lock_size_t i = 1; i < count; i++ ) {
655 monitors[i]->owner = owner;
656 monitors[i]->recursion = 0;
657 }
658}
659
660static inline void set_mask( monitor_desc * storage [], __lock_size_t count, const __waitfor_mask_t & mask ) {
661 for( __lock_size_t i = 0; i < count; i++) {
662 storage[i]->mask = mask;
663 }
664}
665
666static inline void reset_mask( monitor_desc * this ) {
667 this->mask.accepted = NULL;
668 this->mask.data = NULL;
669 this->mask.size = 0;
670}
671
672static inline thread_desc * next_thread( monitor_desc * this ) {
673 //Check the signaller stack
674 __cfaabi_dbg_print_safe( "Kernel : mon %p AS-stack top %p\n", this, this->signal_stack.top);
675 __condition_criterion_t * urgent = pop( this->signal_stack );
676 if( urgent ) {
677 //The signaller stack is not empty,
678 //regardless of if we are ready to baton pass,
679 //we need to set the monitor as in use
680 set_owner( this, urgent->owner->waiting_thread );
681
682 return check_condition( urgent );
683 }
684
685 // No signaller thread
686 // Get the next thread in the entry_queue
687 thread_desc * new_owner = pop_head( this->entry_queue );
688 set_owner( this, new_owner );
689
690 return new_owner;
691}
692
693static inline bool is_accepted( monitor_desc * this, const __monitor_group_t & group ) {
694 __acceptable_t * it = this->mask.data; // Optim
695 __lock_size_t count = this->mask.size;
696
697 // Check if there are any acceptable functions
698 if( !it ) return false;
699
700 // If this isn't the first monitor to test this, there is no reason to repeat the test.
701 if( this != group[0] ) return group[0]->mask.accepted >= 0;
702
703 // For all acceptable functions check if this is the current function.
704 for( __lock_size_t i = 0; i < count; i++, it++ ) {
705 if( *it == group ) {
706 *this->mask.accepted = i;
707 return true;
708 }
709 }
710
711 // No function matched
712 return false;
713}
714
715static inline void init( __lock_size_t count, monitor_desc * monitors [], __condition_node_t & waiter, __condition_criterion_t criteria [] ) {
716 for( __lock_size_t i = 0; i < count; i++) {
717 (criteria[i]){ monitors[i], waiter };
718 }
719
720 waiter.criteria = criteria;
721}
722
723static inline void init_push( __lock_size_t count, monitor_desc * monitors [], __condition_node_t & waiter, __condition_criterion_t criteria [] ) {
724 for( __lock_size_t i = 0; i < count; i++) {
725 (criteria[i]){ monitors[i], waiter };
726 __cfaabi_dbg_print_safe( "Kernel : target %p = %p\n", criteria[i].target, &criteria[i] );
727 push( criteria[i].target->signal_stack, &criteria[i] );
728 }
729
730 waiter.criteria = criteria;
731}
732
733static inline void lock_all( __spinlock_t * locks [], __lock_size_t count ) {
734 for( __lock_size_t i = 0; i < count; i++ ) {
735 lock( *locks[i] __cfaabi_dbg_ctx2 );
736 }
737}
738
739static inline void lock_all( monitor_desc * source [], __spinlock_t * /*out*/ locks [], __lock_size_t count ) {
740 for( __lock_size_t i = 0; i < count; i++ ) {
741 __spinlock_t * l = &source[i]->lock;
742 lock( *l __cfaabi_dbg_ctx2 );
743 if(locks) locks[i] = l;
744 }
745}
746
747static inline void unlock_all( __spinlock_t * locks [], __lock_size_t count ) {
748 for( __lock_size_t i = 0; i < count; i++ ) {
749 unlock( *locks[i] );
750 }
751}
752
753static inline void unlock_all( monitor_desc * locks [], __lock_size_t count ) {
754 for( __lock_size_t i = 0; i < count; i++ ) {
755 unlock( locks[i]->lock );
756 }
757}
758
759static inline void save(
760 monitor_desc * ctx [],
761 __lock_size_t count,
762 __attribute((unused)) __spinlock_t * locks [],
763 unsigned int /*out*/ recursions [],
764 __waitfor_mask_t /*out*/ masks []
765) {
766 for( __lock_size_t i = 0; i < count; i++ ) {
767 recursions[i] = ctx[i]->recursion;
768 masks[i] = ctx[i]->mask;
769 }
770}
771
772static inline void restore(
773 monitor_desc * ctx [],
774 __lock_size_t count,
775 __spinlock_t * locks [],
776 unsigned int /*out*/ recursions [],
777 __waitfor_mask_t /*out*/ masks []
778) {
779 lock_all( locks, count );
780 for( __lock_size_t i = 0; i < count; i++ ) {
781 ctx[i]->recursion = recursions[i];
782 ctx[i]->mask = masks[i];
783 }
784 unlock_all( locks, count );
785}
786
787// Function has 2 different behavior
788// 1 - Marks a monitors as being ready to run
789// 2 - Checks if all the monitors are ready to run
790// if so return the thread to run
791static inline thread_desc * check_condition( __condition_criterion_t * target ) {
792 __condition_node_t * node = target->owner;
793 unsigned short count = node->count;
794 __condition_criterion_t * criteria = node->criteria;
795
796 bool ready2run = true;
797
798 for( int i = 0; i < count; i++ ) {
799
800 // __cfaabi_dbg_print_safe( "Checking %p for %p\n", &criteria[i], target );
801 if( &criteria[i] == target ) {
802 criteria[i].ready = true;
803 // __cfaabi_dbg_print_safe( "True\n" );
804 }
805
806 ready2run = criteria[i].ready && ready2run;
807 }
808
809 __cfaabi_dbg_print_safe( "Kernel : Runing %i (%p)\n", ready2run, ready2run ? node->waiting_thread : NULL );
810 return ready2run ? node->waiting_thread : NULL;
811}
812
813static inline void brand_condition( condition & this ) {
814 thread_desc * thrd = TL_GET( this_thread );
815 if( !this.monitors ) {
816 // __cfaabi_dbg_print_safe( "Branding\n" );
817 assertf( thrd->monitors.data != NULL, "No current monitor to brand condition %p", thrd->monitors.data );
818 this.monitor_count = thrd->monitors.size;
819
820 this.monitors = (monitor_desc **)malloc( this.monitor_count * sizeof( *this.monitors ) );
821 for( int i = 0; i < this.monitor_count; i++ ) {
822 this.monitors[i] = thrd->monitors[i];
823 }
824 }
825}
826
827static inline [thread_desc *, int] search_entry_queue( const __waitfor_mask_t & mask, monitor_desc * monitors [], __lock_size_t count ) {
828
829 __queue_t(thread_desc) & entry_queue = monitors[0]->entry_queue;
830
831 // For each thread in the entry-queue
832 for( thread_desc ** thrd_it = &entry_queue.head;
833 *thrd_it;
834 thrd_it = &(*thrd_it)->next
835 ) {
836 // For each acceptable check if it matches
837 int i = 0;
838 __acceptable_t * end = end (mask);
839 __acceptable_t * begin = begin(mask);
840 for( __acceptable_t * it = begin; it != end; it++, i++ ) {
841 // Check if we have a match
842 if( *it == (*thrd_it)->monitors ) {
843
844 // If we have a match return it
845 // after removeing it from the entry queue
846 return [remove( entry_queue, thrd_it ), i];
847 }
848 }
849 }
850
851 return [0, -1];
852}
853
854forall(dtype T | sized( T ))
855static inline __lock_size_t insert_unique( T * array [], __lock_size_t & size, T * val ) {
856 if( !val ) return size;
857
858 for( __lock_size_t i = 0; i <= size; i++) {
859 if( array[i] == val ) return size;
860 }
861
862 array[size] = val;
863 size = size + 1;
864 return size;
865}
866
867static inline __lock_size_t count_max( const __waitfor_mask_t & mask ) {
868 __lock_size_t max = 0;
869 for( __lock_size_t i = 0; i < mask.size; i++ ) {
870 __acceptable_t & accepted = mask[i];
871 max += accepted.size;
872 }
873 return max;
874}
875
876static inline __lock_size_t aggregate( monitor_desc * storage [], const __waitfor_mask_t & mask ) {
877 __lock_size_t size = 0;
878 for( __lock_size_t i = 0; i < mask.size; i++ ) {
879 __acceptable_t & accepted = mask[i];
880 __libcfa_small_sort( accepted.data, accepted.size );
881 for( __lock_size_t j = 0; j < accepted.size; j++) {
882 insert_unique( storage, size, accepted[j] );
883 }
884 }
885 // TODO insertion sort instead of this
886 __libcfa_small_sort( storage, size );
887 return size;
888}
889
890// Local Variables: //
891// mode: c //
892// tab-width: 4 //
893// End: //
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