source: libcfa/src/concurrency/locks.hfa@ 20be782

ADT ast-experimental pthread-emulation
Last change on this file since 20be782 was fd365da, checked in by caparsons <caparson@…>, 3 years ago

added atomics to other spin_queue style locks
  • Property mode set to 100644
File size: 22.1 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2021 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// locks.hfa -- PUBLIC
8// Runtime locks that used with the runtime thread system.
9//
10// Author : Colby Alexander Parsons
11// Created On : Thu Jan 21 19:46:50 2021
12// Last Modified By :
13// Last Modified On :
14// Update Count :
15//
16
17#pragma once
18
19#include <stdbool.h>
20#include <stdio.h>
21
22#include "bits/weakso_locks.hfa"
23#include "containers/queueLockFree.hfa"
24#include "containers/list.hfa"
25
26#include "limits.hfa"
27#include "thread.hfa"
28
29#include "time_t.hfa"
30#include "time.hfa"
31
32//-----------------------------------------------------------------------------
33// Semaphore
34struct semaphore {
35 __spinlock_t lock;
36 int count;
37 __queue_t(thread$) waiting;
38};
39
40void ?{}(semaphore & this, int count = 1);
41void ^?{}(semaphore & this);
42bool P (semaphore & this);
43bool V (semaphore & this);
44bool V (semaphore & this, unsigned count);
45thread$ * V (semaphore & this, bool );
46
47//----------
48struct single_acquisition_lock {
49 inline blocking_lock;
50};
51
52static inline void ?{}( single_acquisition_lock & this ) {((blocking_lock &)this){ false, false };}
53static inline void ^?{}( single_acquisition_lock & this ) {}
54static inline void lock ( single_acquisition_lock & this ) { lock ( (blocking_lock &)this ); }
55static inline bool try_lock ( single_acquisition_lock & this ) { return try_lock( (blocking_lock &)this ); }
56static inline void unlock ( single_acquisition_lock & this ) { unlock ( (blocking_lock &)this ); }
57static inline size_t on_wait ( single_acquisition_lock & this ) { return on_wait ( (blocking_lock &)this ); }
58static inline void on_wakeup( single_acquisition_lock & this, size_t v ) { on_wakeup ( (blocking_lock &)this, v ); }
59static inline void on_notify( single_acquisition_lock & this, struct thread$ * t ) { on_notify( (blocking_lock &)this, t ); }
60
61//----------
62struct owner_lock {
63 inline blocking_lock;
64};
65
66static inline void ?{}( owner_lock & this ) {((blocking_lock &)this){ true, true };}
67static inline void ^?{}( owner_lock & this ) {}
68static inline void lock ( owner_lock & this ) { lock ( (blocking_lock &)this ); }
69static inline bool try_lock ( owner_lock & this ) { return try_lock( (blocking_lock &)this ); }
70static inline void unlock ( owner_lock & this ) { unlock ( (blocking_lock &)this ); }
71static inline size_t on_wait ( owner_lock & this ) { return on_wait ( (blocking_lock &)this ); }
72static inline void on_wakeup( owner_lock & this, size_t v ) { on_wakeup ( (blocking_lock &)this, v ); }
73static inline void on_notify( owner_lock & this, struct thread$ * t ) { on_notify( (blocking_lock &)this, t ); }
74
75//-----------------------------------------------------------------------------
76// MCS Lock
77struct mcs_node {
78 mcs_node * volatile next;
79 single_sem sem;
80};
81
82static inline void ?{}(mcs_node & this) { this.next = 0p; }
83
84static inline mcs_node * volatile & ?`next ( mcs_node * node ) {
85 return node->next;
86}
87
88struct mcs_lock {
89 mcs_queue(mcs_node) queue;
90};
91
92static inline void lock(mcs_lock & l, mcs_node & n) {
93 if(push(l.queue, &n))
94 wait(n.sem);
95}
96
97static inline void unlock(mcs_lock & l, mcs_node & n) {
98 mcs_node * next = advance(l.queue, &n);
99 if(next) post(next->sem);
100}
101
102//-----------------------------------------------------------------------------
103// MCS Spin Lock
104// - No recursive acquisition
105// - Needs to be released by owner
106
107struct mcs_spin_node {
108 mcs_spin_node * volatile next;
109 volatile bool locked;
110};
111
112struct mcs_spin_queue {
113 mcs_spin_node * volatile tail;
114};
115
116static inline void ?{}(mcs_spin_node & this) { this.next = 0p; this.locked = true; }
117
118static inline mcs_spin_node * volatile & ?`next ( mcs_spin_node * node ) {
119 return node->next;
120}
121
122struct mcs_spin_lock {
123 mcs_spin_queue queue;
124};
125
126static inline void lock(mcs_spin_lock & l, mcs_spin_node & n) {
127 mcs_spin_node * prev = __atomic_exchange_n(&l.queue.tail, &n, __ATOMIC_SEQ_CST);
128 n.locked = true;
129 if(prev == 0p) return;
130 prev->next = &n;
131 while(__atomic_load_n(&n.locked, __ATOMIC_RELAXED)) Pause();
132}
133
134static inline void unlock(mcs_spin_lock & l, mcs_spin_node & n) {
135 mcs_spin_node * n_ptr = &n;
136 if (__atomic_compare_exchange_n(&l.queue.tail, &n_ptr, 0p, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) return;
137 while (__atomic_load_n(&n.next, __ATOMIC_RELAXED) == 0p) {}
138 n.next->locked = false;
139}
140
141//-----------------------------------------------------------------------------
142// CLH Spinlock
143// - No recursive acquisition
144// - Needs to be released by owner
145
146struct clh_lock {
147 volatile bool * volatile tail;
148};
149
150static inline void ?{}( clh_lock & this ) { this.tail = malloc(); *this.tail = true; }
151static inline void ^?{}( clh_lock & this ) { free(this.tail); }
152
153static inline void lock(clh_lock & l) {
154 thread$ * curr_thd = active_thread();
155 *(curr_thd->clh_node) = false;
156 volatile bool * prev = __atomic_exchange_n((bool **)(&l.tail), (bool *)(curr_thd->clh_node), __ATOMIC_SEQ_CST);
157 while(!__atomic_load_n(prev, __ATOMIC_ACQUIRE)) Pause();
158 curr_thd->clh_prev = prev;
159}
160
161static inline void unlock(clh_lock & l) {
162 thread$ * curr_thd = active_thread();
163 __atomic_store_n(curr_thd->clh_node, true, __ATOMIC_RELEASE);
164 curr_thd->clh_node = curr_thd->clh_prev;
165}
166
167//-----------------------------------------------------------------------------
168// Linear backoff Spinlock
169struct linear_backoff_then_block_lock {
170 // Spin lock used for mutual exclusion
171 __spinlock_t spinlock;
172
173 // Current thread owning the lock
174 struct thread$ * owner;
175
176 // List of blocked threads
177 dlist( thread$ ) blocked_threads;
178
179 // Used for comparing and exchanging
180 volatile size_t lock_value;
181
182 // used for linear backoff spinning
183 int spin_start;
184 int spin_end;
185 int spin_count;
186
187 // after unsuccessful linear backoff yield this many times
188 int yield_count;
189};
190
191static inline void ?{}( linear_backoff_then_block_lock & this, int spin_start, int spin_end, int spin_count, int yield_count ) {
192 this.spinlock{};
193 this.blocked_threads{};
194 this.lock_value = 0;
195 this.spin_start = spin_start;
196 this.spin_end = spin_end;
197 this.spin_count = spin_count;
198 this.yield_count = yield_count;
199}
200static inline void ?{}( linear_backoff_then_block_lock & this ) { this{4, 1024, 16, 0}; }
201static inline void ^?{}( linear_backoff_then_block_lock & this ) {}
202static inline void ?{}( linear_backoff_then_block_lock & this, linear_backoff_then_block_lock this2 ) = void;
203static inline void ?=?( linear_backoff_then_block_lock & this, linear_backoff_then_block_lock this2 ) = void;
204
205static inline bool internal_try_lock(linear_backoff_then_block_lock & this, size_t & compare_val) with(this) {
206 if (__atomic_compare_exchange_n(&lock_value, &compare_val, 1, false, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
207 owner = active_thread();
208 return true;
209 }
210 return false;
211}
212
213static inline bool try_lock(linear_backoff_then_block_lock & this) { size_t compare_val = 0; return internal_try_lock(this, compare_val); }
214
215static inline bool try_lock_contention(linear_backoff_then_block_lock & this) with(this) {
216 if (__atomic_exchange_n(&lock_value, 2, __ATOMIC_ACQUIRE) == 0) {
217 owner = active_thread();
218 return true;
219 }
220 return false;
221}
222
223static inline bool block(linear_backoff_then_block_lock & this) with(this) {
224 lock( spinlock __cfaabi_dbg_ctx2 );
225 if (lock_value != 2) {
226 unlock( spinlock );
227 return true;
228 }
229 insert_last( blocked_threads, *active_thread() );
230 unlock( spinlock );
231 park( );
232 return true;
233}
234
235static inline void lock(linear_backoff_then_block_lock & this) with(this) {
236 // if owner just return
237 if (active_thread() == owner) return;
238 size_t compare_val = 0;
239 int spin = spin_start;
240 // linear backoff
241 for( ;; ) {
242 compare_val = 0;
243 if (internal_try_lock(this, compare_val)) return;
244 if (2 == compare_val) break;
245 for (int i = 0; i < spin; i++) Pause();
246 if (spin >= spin_end) break;
247 spin += spin;
248 }
249
250 if(2 != compare_val && try_lock_contention(this)) return;
251 // block until signalled
252 while (block(this)) if(try_lock_contention(this)) return;
253}
254
255static inline void unlock(linear_backoff_then_block_lock & this) with(this) {
256 verify(lock_value > 0);
257 owner = 0p;
258 if (__atomic_exchange_n(&lock_value, 0, __ATOMIC_RELEASE) == 1) return;
259 lock( spinlock __cfaabi_dbg_ctx2 );
260 thread$ * t = &try_pop_front( blocked_threads );
261 unlock( spinlock );
262 unpark( t );
263}
264
265static inline void on_notify(linear_backoff_then_block_lock & this, struct thread$ * t ) { unpark(t); }
266static inline size_t on_wait(linear_backoff_then_block_lock & this) { unlock(this); return 0; }
267static inline void on_wakeup(linear_backoff_then_block_lock & this, size_t recursion ) { lock(this); }
268
269//-----------------------------------------------------------------------------
270// Fast Block Lock
271
272// minimal blocking lock
273// - No reacquire for cond var
274// - No recursive acquisition
275// - No ownership
276struct fast_block_lock {
277 // List of blocked threads
278 dlist( thread$ ) blocked_threads;
279
280 // Spin lock used for mutual exclusion
281 __spinlock_t lock;
282
283 // flag showing if lock is held
284 bool held:1;
285
286 #ifdef __CFA_DEBUG__
287 // for deadlock detection
288 struct thread$ * owner;
289 #endif
290};
291
292static inline void ?{}( fast_block_lock & this ) with(this) {
293 lock{};
294 blocked_threads{};
295 held = false;
296}
297static inline void ^?{}( fast_block_lock & this ) {}
298static inline void ?{}( fast_block_lock & this, fast_block_lock this2 ) = void;
299static inline void ?=?( fast_block_lock & this, fast_block_lock this2 ) = void;
300
301// if this is called recursively IT WILL DEADLOCK!!!!!
302static inline void lock(fast_block_lock & this) with(this) {
303 lock( lock __cfaabi_dbg_ctx2 );
304
305 #ifdef __CFA_DEBUG__
306 assert(!(held && owner == active_thread()));
307 #endif
308 if (held) {
309 insert_last( blocked_threads, *active_thread() );
310 unlock( lock );
311 park( );
312 return;
313 }
314 held = true;
315 #ifdef __CFA_DEBUG__
316 owner = active_thread();
317 #endif
318 unlock( lock );
319}
320
321static inline void unlock(fast_block_lock & this) with(this) {
322 lock( lock __cfaabi_dbg_ctx2 );
323 /* paranoid */ verifyf( held != false, "Attempt to release lock %p that isn't held", &this );
324 thread$ * t = &try_pop_front( blocked_threads );
325 held = ( t ? true : false );
326 #ifdef __CFA_DEBUG__
327 owner = ( t ? t : 0p );
328 #endif
329 unpark( t );
330 unlock( lock );
331}
332
333static inline void on_notify(fast_block_lock & this, struct thread$ * t ) { unpark(t); }
334static inline size_t on_wait(fast_block_lock & this) { unlock(this); return 0; }
335static inline void on_wakeup(fast_block_lock & this, size_t recursion ) { }
336
337//-----------------------------------------------------------------------------
338// simple_owner_lock
339
340// pthread owner lock
341// - reacquire for cond var
342// - recursive acquisition
343// - ownership
344struct simple_owner_lock {
345 // List of blocked threads
346 dlist( thread$ ) blocked_threads;
347
348 // Spin lock used for mutual exclusion
349 __spinlock_t lock;
350
351 // owner showing if lock is held
352 struct thread$ * owner;
353
354 size_t recursion_count;
355};
356
357static inline void ?{}( simple_owner_lock & this ) with(this) {
358 lock{};
359 blocked_threads{};
360 owner = 0p;
361 recursion_count = 0;
362}
363static inline void ^?{}( simple_owner_lock & this ) {}
364static inline void ?{}( simple_owner_lock & this, simple_owner_lock this2 ) = void;
365static inline void ?=?( simple_owner_lock & this, simple_owner_lock this2 ) = void;
366
367static inline void lock(simple_owner_lock & this) with(this) {
368 if (owner == active_thread()) {
369 recursion_count++;
370 return;
371 }
372 lock( lock __cfaabi_dbg_ctx2 );
373
374 if (owner != 0p) {
375 insert_last( blocked_threads, *active_thread() );
376 unlock( lock );
377 park( );
378 return;
379 }
380 owner = active_thread();
381 recursion_count = 1;
382 unlock( lock );
383}
384
385// TODO: fix duplicate def issue and bring this back
386// void pop_and_set_new_owner( simple_owner_lock & this ) with( this ) {
387 // thread$ * t = &try_pop_front( blocked_threads );
388 // owner = t;
389 // recursion_count = ( t ? 1 : 0 );
390 // unpark( t );
391// }
392
393static inline void unlock(simple_owner_lock & this) with(this) {
394 lock( lock __cfaabi_dbg_ctx2 );
395 /* paranoid */ verifyf( owner != 0p, "Attempt to release lock %p that isn't held", &this );
396 /* paranoid */ verifyf( owner == active_thread(), "Thread %p other than the owner %p attempted to release owner lock %p", owner, active_thread(), &this );
397 // if recursion count is zero release lock and set new owner if one is waiting
398 recursion_count--;
399 if ( recursion_count == 0 ) {
400 // pop_and_set_new_owner( this );
401 thread$ * t = &try_pop_front( blocked_threads );
402 owner = t;
403 recursion_count = ( t ? 1 : 0 );
404 unpark( t );
405 }
406 unlock( lock );
407}
408
409static inline void on_notify(simple_owner_lock & this, struct thread$ * t ) with(this) {
410 lock( lock __cfaabi_dbg_ctx2 );
411 // lock held
412 if ( owner != 0p ) {
413 insert_last( blocked_threads, *t );
414 unlock( lock );
415 }
416 // lock not held
417 else {
418 owner = t;
419 recursion_count = 1;
420 unpark( t );
421 unlock( lock );
422 }
423}
424
425static inline size_t on_wait(simple_owner_lock & this) with(this) {
426 lock( lock __cfaabi_dbg_ctx2 );
427 /* paranoid */ verifyf( owner != 0p, "Attempt to release lock %p that isn't held", &this );
428 /* paranoid */ verifyf( owner == active_thread(), "Thread %p other than the owner %p attempted to release owner lock %p", owner, active_thread(), &this );
429
430 size_t ret = recursion_count;
431
432 // pop_and_set_new_owner( this );
433
434 thread$ * t = &try_pop_front( blocked_threads );
435 owner = t;
436 recursion_count = ( t ? 1 : 0 );
437 unpark( t );
438
439 unlock( lock );
440 return ret;
441}
442
443static inline void on_wakeup(simple_owner_lock & this, size_t recursion ) with(this) { recursion_count = recursion; }
444
445//-----------------------------------------------------------------------------
446// Spin Queue Lock
447
448// - No reacquire for cond var
449// - No recursive acquisition
450// - No ownership
451// - spin lock with no locking/atomics in unlock
452struct spin_queue_lock {
453 // Spin lock used for mutual exclusion
454 mcs_spin_lock lock;
455
456 // flag showing if lock is held
457 volatile bool held;
458
459 #ifdef __CFA_DEBUG__
460 // for deadlock detection
461 struct thread$ * owner;
462 #endif
463};
464
465static inline void ?{}( spin_queue_lock & this ) with(this) {
466 lock{};
467 held = false;
468}
469static inline void ^?{}( spin_queue_lock & this ) {}
470static inline void ?{}( spin_queue_lock & this, spin_queue_lock this2 ) = void;
471static inline void ?=?( spin_queue_lock & this, spin_queue_lock this2 ) = void;
472
473// if this is called recursively IT WILL DEADLOCK!!!!!
474static inline void lock(spin_queue_lock & this) with(this) {
475 mcs_spin_node node;
476 #ifdef __CFA_DEBUG__
477 assert(!(held && owner == active_thread()));
478 #endif
479 lock( lock, node );
480 while(__atomic_load_n(&held, __ATOMIC_SEQ_CST)) Pause();
481 __atomic_store_n(&held, true, __ATOMIC_SEQ_CST);
482 unlock( lock, node );
483 #ifdef __CFA_DEBUG__
484 owner = active_thread();
485 #endif
486}
487
488static inline void unlock(spin_queue_lock & this) with(this) {
489 #ifdef __CFA_DEBUG__
490 owner = 0p;
491 #endif
492 __atomic_store_n(&held, false, __ATOMIC_RELEASE);
493}
494
495static inline void on_notify(spin_queue_lock & this, struct thread$ * t ) { unpark(t); }
496static inline size_t on_wait(spin_queue_lock & this) { unlock(this); return 0; }
497static inline void on_wakeup(spin_queue_lock & this, size_t recursion ) { }
498
499
500//-----------------------------------------------------------------------------
501// MCS Block Spin Lock
502
503// - No reacquire for cond var
504// - No recursive acquisition
505// - No ownership
506// - Blocks but first node spins (like spin queue but blocking for not first thd)
507struct mcs_block_spin_lock {
508 // Spin lock used for mutual exclusion
509 mcs_lock lock;
510
511 // flag showing if lock is held
512 volatile bool held;
513
514 #ifdef __CFA_DEBUG__
515 // for deadlock detection
516 struct thread$ * owner;
517 #endif
518};
519
520static inline void ?{}( mcs_block_spin_lock & this ) with(this) {
521 lock{};
522 held = false;
523}
524static inline void ^?{}( mcs_block_spin_lock & this ) {}
525static inline void ?{}( mcs_block_spin_lock & this, mcs_block_spin_lock this2 ) = void;
526static inline void ?=?( mcs_block_spin_lock & this, mcs_block_spin_lock this2 ) = void;
527
528// if this is called recursively IT WILL DEADLOCK!!!!!
529static inline void lock(mcs_block_spin_lock & this) with(this) {
530 mcs_node node;
531 #ifdef __CFA_DEBUG__
532 assert(!(held && owner == active_thread()));
533 #endif
534 lock( lock, node );
535 while(__atomic_load_n(&held, __ATOMIC_SEQ_CST)) Pause();
536 __atomic_store_n(&held, true, __ATOMIC_SEQ_CST);
537 unlock( lock, node );
538 #ifdef __CFA_DEBUG__
539 owner = active_thread();
540 #endif
541}
542
543static inline void unlock(mcs_block_spin_lock & this) with(this) {
544 #ifdef __CFA_DEBUG__
545 owner = 0p;
546 #endif
547 __atomic_store_n(&held, false, __ATOMIC_SEQ_CST);
548}
549
550static inline void on_notify(mcs_block_spin_lock & this, struct thread$ * t ) { unpark(t); }
551static inline size_t on_wait(mcs_block_spin_lock & this) { unlock(this); return 0; }
552static inline void on_wakeup(mcs_block_spin_lock & this, size_t recursion ) { }
553
554//-----------------------------------------------------------------------------
555// Block Spin Lock
556
557// - No reacquire for cond var
558// - No recursive acquisition
559// - No ownership
560// - Blocks but first node spins (like spin queue but blocking for not first thd)
561struct block_spin_lock {
562 // Spin lock used for mutual exclusion
563 fast_block_lock lock;
564
565 // flag showing if lock is held
566 volatile bool held;
567
568 #ifdef __CFA_DEBUG__
569 // for deadlock detection
570 struct thread$ * owner;
571 #endif
572};
573
574static inline void ?{}( block_spin_lock & this ) with(this) {
575 lock{};
576 held = false;
577}
578static inline void ^?{}( block_spin_lock & this ) {}
579static inline void ?{}( block_spin_lock & this, block_spin_lock this2 ) = void;
580static inline void ?=?( block_spin_lock & this, block_spin_lock this2 ) = void;
581
582// if this is called recursively IT WILL DEADLOCK!!!!!
583static inline void lock(block_spin_lock & this) with(this) {
584 #ifdef __CFA_DEBUG__
585 assert(!(held && owner == active_thread()));
586 #endif
587 lock( lock );
588 while(__atomic_load_n(&held, __ATOMIC_SEQ_CST)) Pause();
589 __atomic_store_n(&held, true, __ATOMIC_RELEASE);
590 unlock( lock );
591 #ifdef __CFA_DEBUG__
592 owner = active_thread();
593 #endif
594}
595
596static inline void unlock(block_spin_lock & this) with(this) {
597 #ifdef __CFA_DEBUG__
598 owner = 0p;
599 #endif
600 __atomic_store_n(&held, false, __ATOMIC_RELEASE);
601}
602
603static inline void on_notify(block_spin_lock & this, struct thread$ * t ) { unpark(t); }
604static inline size_t on_wait(block_spin_lock & this) { unlock(this); return 0; }
605static inline void on_wakeup(block_spin_lock & this, size_t recursion ) { }
606
607//-----------------------------------------------------------------------------
608// is_blocking_lock
609trait is_blocking_lock(L & | sized(L)) {
610 // For synchronization locks to use when acquiring
611 void on_notify( L &, struct thread$ * );
612
613 // For synchronization locks to use when releasing
614 size_t on_wait( L & );
615
616 // to set recursion count after getting signalled;
617 void on_wakeup( L &, size_t recursion );
618};
619
620//-----------------------------------------------------------------------------
621// // info_thread
622// // the info thread is a wrapper around a thread used
623// // to store extra data for use in the condition variable
624forall(L & | is_blocking_lock(L)) {
625 struct info_thread;
626
627 // // for use by sequence
628 // info_thread(L) *& Back( info_thread(L) * this );
629 // info_thread(L) *& Next( info_thread(L) * this );
630}
631
632//-----------------------------------------------------------------------------
633// Synchronization Locks
634forall(L & | is_blocking_lock(L)) {
635
636 //-----------------------------------------------------------------------------
637 // condition_variable
638
639 // The multi-tool condition variable
640 // - can pass timeouts to wait for either a signal or timeout
641 // - can wait without passing a lock
642 // - can have waiters reacquire different locks while waiting on the same cond var
643 // - has shadow queue
644 // - can be signalled outside of critical sections with no locks held
645 struct condition_variable {
646 // Spin lock used for mutual exclusion
647 __spinlock_t lock;
648
649 // List of blocked threads
650 dlist( info_thread(L) ) blocked_threads;
651
652 // Count of current blocked threads
653 int count;
654 };
655
656
657 void ?{}( condition_variable(L) & this );
658 void ^?{}( condition_variable(L) & this );
659
660 bool notify_one( condition_variable(L) & this );
661 bool notify_all( condition_variable(L) & this );
662
663 uintptr_t front( condition_variable(L) & this );
664
665 bool empty ( condition_variable(L) & this );
666 int counter( condition_variable(L) & this );
667
668 void wait( condition_variable(L) & this );
669 void wait( condition_variable(L) & this, uintptr_t info );
670 bool wait( condition_variable(L) & this, Duration duration );
671 bool wait( condition_variable(L) & this, uintptr_t info, Duration duration );
672
673 void wait( condition_variable(L) & this, L & l );
674 void wait( condition_variable(L) & this, L & l, uintptr_t info );
675 bool wait( condition_variable(L) & this, L & l, Duration duration );
676 bool wait( condition_variable(L) & this, L & l, uintptr_t info, Duration duration );
677
678 //-----------------------------------------------------------------------------
679 // fast_cond_var
680
681 // The trimmed and slim condition variable
682 // - no internal lock so you must hold a lock while using this cond var
683 // - signalling without holding branded lock is UNSAFE!
684 // - only allows usage of one lock, cond var is branded after usage
685
686 struct fast_cond_var {
687 // List of blocked threads
688 dlist( info_thread(L) ) blocked_threads;
689 #ifdef __CFA_DEBUG__
690 L * lock_used;
691 #endif
692 };
693
694 void ?{}( fast_cond_var(L) & this );
695 void ^?{}( fast_cond_var(L) & this );
696
697 bool notify_one( fast_cond_var(L) & this );
698 bool notify_all( fast_cond_var(L) & this );
699
700 uintptr_t front( fast_cond_var(L) & this );
701 bool empty ( fast_cond_var(L) & this );
702
703 void wait( fast_cond_var(L) & this, L & l );
704 void wait( fast_cond_var(L) & this, L & l, uintptr_t info );
705
706
707 //-----------------------------------------------------------------------------
708 // pthread_cond_var
709 //
710 // - cond var with minimal footprint
711 // - supports operations needed for phthread cond
712
713 struct pthread_cond_var {
714 dlist( info_thread(L) ) blocked_threads;
715 __spinlock_t lock;
716 };
717
718 void ?{}( pthread_cond_var(L) & this );
719 void ^?{}( pthread_cond_var(L) & this );
720
721 bool notify_one( pthread_cond_var(L) & this );
722 bool notify_all( pthread_cond_var(L) & this );
723
724 uintptr_t front( pthread_cond_var(L) & this );
725 bool empty ( pthread_cond_var(L) & this );
726
727 void wait( pthread_cond_var(L) & this, L & l );
728 void wait( pthread_cond_var(L) & this, L & l, uintptr_t info );
729 bool wait( pthread_cond_var(L) & this, L & l, timespec t );
730 bool wait( pthread_cond_var(L) & this, L & l, uintptr_t info, timespec t );
731}
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