source: libcfa/src/concurrency/locks.hfa @ ae06e0b

pthread-emulationqualifiedEnum
Last change on this file since ae06e0b was ae06e0b, checked in by caparsons <caparson@…>, 6 months ago

added pthread_cond_var

  • Property mode set to 100644
File size: 21.6 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        bool locked:1;
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        if(prev != 0p) {
129                prev->next = &n;
130                while(n.locked) Pause();
131        }
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) ) {
137                while (n.next == 0p) {}
138                n.next->locked = false;
139        }
140}
141
142//-----------------------------------------------------------------------------
143// CLH Spinlock
144// - No recursive acquisition
145// - Needs to be released by owner
146
147struct clh_lock {
148        volatile bool * volatile tail;
149};
150
151static inline void  ?{}( clh_lock & this ) { this.tail = malloc(); *this.tail = true; }
152static inline void ^?{}( clh_lock & this ) { free(this.tail); }
153
154static inline void lock(clh_lock & l) {
155        thread$ * curr_thd = active_thread();
156        *(curr_thd->clh_node) = false;
157        volatile bool * prev = __atomic_exchange_n((bool **)(&l.tail), (bool *)(curr_thd->clh_node), __ATOMIC_SEQ_CST);
158        while(!__atomic_load_n(prev, __ATOMIC_ACQUIRE)) Pause();
159        curr_thd->clh_prev = prev;
160}
161
162static inline void unlock(clh_lock & l) {
163        thread$ * curr_thd = active_thread();
164        __atomic_store_n(curr_thd->clh_node, true, __ATOMIC_RELEASE);
165        curr_thd->clh_node = curr_thd->clh_prev;
166}
167
168//-----------------------------------------------------------------------------
169// Linear backoff Spinlock
170struct linear_backoff_then_block_lock {
171        // Spin lock used for mutual exclusion
172        __spinlock_t spinlock;
173
174        // Current thread owning the lock
175        struct thread$ * owner;
176
177        // List of blocked threads
178        dlist( thread$ ) blocked_threads;
179
180        // Used for comparing and exchanging
181        volatile size_t lock_value;
182
183        // used for linear backoff spinning
184        int spin_start;
185        int spin_end;
186        int spin_count;
187
188        // after unsuccessful linear backoff yield this many times
189        int yield_count;
190};
191
192static inline void  ?{}( linear_backoff_then_block_lock & this, int spin_start, int spin_end, int spin_count, int yield_count ) {
193        this.spinlock{};
194        this.blocked_threads{};
195        this.lock_value = 0;
196        this.spin_start = spin_start;
197        this.spin_end = spin_end;
198        this.spin_count = spin_count;
199        this.yield_count = yield_count;
200}
201static inline void  ?{}( linear_backoff_then_block_lock & this ) { this{4, 1024, 16, 0}; }
202static inline void ^?{}( linear_backoff_then_block_lock & this ) {}
203static inline void ?{}( linear_backoff_then_block_lock & this, linear_backoff_then_block_lock this2 ) = void;
204static inline void ?=?( linear_backoff_then_block_lock & this, linear_backoff_then_block_lock this2 ) = void;
205
206static inline bool internal_try_lock(linear_backoff_then_block_lock & this, size_t & compare_val) with(this) {
207        if (__atomic_compare_exchange_n(&lock_value, &compare_val, 1, false, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
208                owner = active_thread();
209                return true;
210        }
211        return false;
212}
213
214static inline bool try_lock(linear_backoff_then_block_lock & this) { size_t compare_val = 0; return internal_try_lock(this, compare_val); }
215
216static inline bool try_lock_contention(linear_backoff_then_block_lock & this) with(this) {
217        if (__atomic_exchange_n(&lock_value, 2, __ATOMIC_ACQUIRE) == 0) {
218                owner = active_thread();
219                return true;
220        }
221        return false;
222}
223
224static inline bool block(linear_backoff_then_block_lock & this) with(this) {
225        lock( spinlock __cfaabi_dbg_ctx2 );
226        if (lock_value != 2) {
227                unlock( spinlock );
228                return true;
229        }
230        insert_last( blocked_threads, *active_thread() );
231        unlock( spinlock );
232        park( );
233        return true;
234}
235
236static inline void lock(linear_backoff_then_block_lock & this) with(this) {
237        // if owner just return
238        if (active_thread() == owner) return;
239        size_t compare_val = 0;
240        int spin = spin_start;
241        // linear backoff
242        for( ;; ) {
243                compare_val = 0;
244                if (internal_try_lock(this, compare_val)) return;
245                if (2 == compare_val) break;
246                for (int i = 0; i < spin; i++) Pause();
247                if (spin >= spin_end) break;
248                spin += spin;
249        }
250
251        if(2 != compare_val && try_lock_contention(this)) return;
252        // block until signalled
253        while (block(this)) if(try_lock_contention(this)) return;
254}
255
256static inline void unlock(linear_backoff_then_block_lock & this) with(this) {
257        verify(lock_value > 0);
258    owner = 0p;
259    if (__atomic_exchange_n(&lock_value, 0, __ATOMIC_RELEASE) == 1) return;
260        lock( spinlock __cfaabi_dbg_ctx2 );
261        thread$ * t = &try_pop_front( blocked_threads );
262        unlock( spinlock );
263        unpark( t );
264}
265
266static inline void on_notify(linear_backoff_then_block_lock & this, struct thread$ * t ) { unpark(t); }
267static inline size_t on_wait(linear_backoff_then_block_lock & this) { unlock(this); return 0; }
268static inline void on_wakeup(linear_backoff_then_block_lock & this, size_t recursion ) { lock(this); }
269
270//-----------------------------------------------------------------------------
271// Fast Block Lock
272
273// minimal blocking lock
274// - No reacquire for cond var
275// - No recursive acquisition
276// - No ownership
277struct fast_block_lock {
278        // List of blocked threads
279        dlist( thread$ ) blocked_threads;
280
281        // Spin lock used for mutual exclusion
282        __spinlock_t lock;
283
284        // flag showing if lock is held
285        bool held:1;
286
287        #ifdef __CFA_DEBUG__
288        // for deadlock detection
289        struct thread$ * owner;
290        #endif
291};
292
293static inline void  ?{}( fast_block_lock & this ) with(this) {
294        lock{};
295        blocked_threads{};
296        held = false;
297}
298static inline void ^?{}( fast_block_lock & this ) {}
299static inline void ?{}( fast_block_lock & this, fast_block_lock this2 ) = void;
300static inline void ?=?( fast_block_lock & this, fast_block_lock this2 ) = void;
301
302// if this is called recursively IT WILL DEADLOCK!!!!!
303static inline void lock(fast_block_lock & this) with(this) {
304        lock( lock __cfaabi_dbg_ctx2 );
305
306        #ifdef __CFA_DEBUG__
307        assert(!(held && owner == active_thread()));
308        #endif
309        if (held) {
310                insert_last( blocked_threads, *active_thread() );
311                unlock( lock );
312                park( );
313                return;
314        }
315        held = true;
316        #ifdef __CFA_DEBUG__
317        owner = active_thread();
318        #endif
319        unlock( lock );
320}
321
322static inline void unlock(fast_block_lock & this) with(this) {
323        lock( lock __cfaabi_dbg_ctx2 );
324        /* paranoid */ verifyf( held != false, "Attempt to release lock %p that isn't held", &this );
325        thread$ * t = &try_pop_front( blocked_threads );
326        held = ( t ? true : false );
327        #ifdef __CFA_DEBUG__
328        owner = ( t ? t : 0p );
329        #endif
330        unpark( t );
331        unlock( lock );
332}
333
334static inline void on_notify(fast_block_lock & this, struct thread$ * t ) { unpark(t); }
335static inline size_t on_wait(fast_block_lock & this) { unlock(this); return 0; }
336static inline void on_wakeup(fast_block_lock & this, size_t recursion ) { }
337
338//-----------------------------------------------------------------------------
339// simple_owner_lock
340
341// pthread owner lock
342// - reacquire for cond var
343// - recursive acquisition
344// - ownership
345struct simple_owner_lock {
346        // List of blocked threads
347        dlist( thread$ ) blocked_threads;
348
349        // Spin lock used for mutual exclusion
350        __spinlock_t lock;
351
352        // owner showing if lock is held
353        struct thread$ * owner;
354
355        size_t recursion_count;
356};
357
358static inline void  ?{}( simple_owner_lock & this ) with(this) {
359        lock{};
360        blocked_threads{};
361        owner = 0p;
362        recursion_count = 0;
363}
364static inline void ^?{}( simple_owner_lock & this ) {}
365static inline void ?{}( simple_owner_lock & this, simple_owner_lock this2 ) = void;
366static inline void ?=?( simple_owner_lock & this, simple_owner_lock this2 ) = void;
367
368static inline void lock(simple_owner_lock & this) with(this) {
369        if (owner == active_thread()) {
370                recursion_count++;
371                return;
372        }
373        lock( lock __cfaabi_dbg_ctx2 );
374
375        if (owner != 0p) {
376                insert_last( blocked_threads, *active_thread() );
377                unlock( lock );
378                park( );
379                return;
380        }
381        owner = active_thread();
382        recursion_count = 1;
383        unlock( lock );
384}
385
386// TODO: fix duplicate def issue and bring this back
387// void pop_and_set_new_owner( simple_owner_lock & this ) with( this ) {
388        // thread$ * t = &try_pop_front( blocked_threads );
389        // owner = t;
390        // recursion_count = ( t ? 1 : 0 );
391        // unpark( t );
392// }
393
394static inline void unlock(simple_owner_lock & this) with(this) {
395        lock( lock __cfaabi_dbg_ctx2 );
396        /* paranoid */ verifyf( owner != 0p, "Attempt to release lock %p that isn't held", &this );
397        /* paranoid */ verifyf( owner == active_thread(), "Thread %p other than the owner %p attempted to release owner lock %p", owner, active_thread(), &this );
398        // if recursion count is zero release lock and set new owner if one is waiting
399        recursion_count--;
400        if ( recursion_count == 0 ) {
401                // pop_and_set_new_owner( this );
402                thread$ * t = &try_pop_front( blocked_threads );
403                owner = t;
404                recursion_count = ( t ? 1 : 0 );
405                unpark( t );
406        }
407        unlock( lock );
408}
409
410static inline void on_notify(simple_owner_lock & this, struct thread$ * t ) with(this) {
411        lock( lock __cfaabi_dbg_ctx2 );
412        // lock held
413        if ( owner != 0p ) {
414                insert_last( blocked_threads, *t );
415                unlock( lock );
416        }
417        // lock not held
418        else {
419                owner = t;
420                recursion_count = 1;
421                unpark( t );
422                unlock( lock );
423        }
424}
425
426static inline size_t on_wait(simple_owner_lock & this) with(this) {
427        lock( lock __cfaabi_dbg_ctx2 );
428        /* paranoid */ verifyf( owner != 0p, "Attempt to release lock %p that isn't held", &this );
429        /* paranoid */ verifyf( owner == active_thread(), "Thread %p other than the owner %p attempted to release owner lock %p", owner, active_thread(), &this );
430
431        size_t ret = recursion_count;
432
433        // pop_and_set_new_owner( this );
434
435        thread$ * t = &try_pop_front( blocked_threads );
436        owner = t;
437        recursion_count = ( t ? 1 : 0 );
438        unpark( t );
439
440        unlock( lock );
441        return ret;
442}
443
444static inline void on_wakeup(simple_owner_lock & this, size_t recursion ) with(this) { recursion_count = recursion; }
445
446//-----------------------------------------------------------------------------
447// Spin Queue Lock
448
449// - No reacquire for cond var
450// - No recursive acquisition
451// - No ownership
452// - spin lock with no locking/atomics in unlock
453struct spin_queue_lock {
454        // Spin lock used for mutual exclusion
455        mcs_spin_lock lock;
456
457        // flag showing if lock is held
458        bool held:1;
459
460        #ifdef __CFA_DEBUG__
461        // for deadlock detection
462        struct thread$ * owner;
463        #endif
464};
465
466static inline void  ?{}( spin_queue_lock & this ) with(this) {
467        lock{};
468        held = false;
469}
470static inline void ^?{}( spin_queue_lock & this ) {}
471static inline void ?{}( spin_queue_lock & this, spin_queue_lock this2 ) = void;
472static inline void ?=?( spin_queue_lock & this, spin_queue_lock this2 ) = void;
473
474// if this is called recursively IT WILL DEADLOCK!!!!!
475static inline void lock(spin_queue_lock & this) with(this) {
476        mcs_spin_node node;
477        #ifdef __CFA_DEBUG__
478        assert(!(held && owner == active_thread()));
479        #endif
480        lock( lock, node );
481        while(held) Pause();
482        held = true;
483        unlock( lock, node );
484        #ifdef __CFA_DEBUG__
485        owner = active_thread();
486        #endif
487}
488
489static inline void unlock(spin_queue_lock & this) with(this) {
490        #ifdef __CFA_DEBUG__
491        owner = 0p;
492        #endif
493        held = false;
494}
495
496static inline void on_notify(spin_queue_lock & this, struct thread$ * t ) { unpark(t); }
497static inline size_t on_wait(spin_queue_lock & this) { unlock(this); return 0; }
498static inline void on_wakeup(spin_queue_lock & this, size_t recursion ) { }
499
500
501//-----------------------------------------------------------------------------
502// MCS Block Spin Lock
503
504// - No reacquire for cond var
505// - No recursive acquisition
506// - No ownership
507// - Blocks but first node spins (like spin queue but blocking for not first thd)
508struct mcs_block_spin_lock {
509        // Spin lock used for mutual exclusion
510        mcs_lock lock;
511
512        // flag showing if lock is held
513        bool held:1;
514
515        #ifdef __CFA_DEBUG__
516        // for deadlock detection
517        struct thread$ * owner;
518        #endif
519};
520
521static inline void  ?{}( mcs_block_spin_lock & this ) with(this) {
522        lock{};
523        held = false;
524}
525static inline void ^?{}( mcs_block_spin_lock & this ) {}
526static inline void ?{}( mcs_block_spin_lock & this, mcs_block_spin_lock this2 ) = void;
527static inline void ?=?( mcs_block_spin_lock & this, mcs_block_spin_lock this2 ) = void;
528
529// if this is called recursively IT WILL DEADLOCK!!!!!
530static inline void lock(mcs_block_spin_lock & this) with(this) {
531        mcs_node node;
532        #ifdef __CFA_DEBUG__
533        assert(!(held && owner == active_thread()));
534        #endif
535        lock( lock, node );
536        while(held) Pause();
537        held = true;
538        unlock( lock, node );
539        #ifdef __CFA_DEBUG__
540        owner = active_thread();
541        #endif
542}
543
544static inline void unlock(mcs_block_spin_lock & this) with(this) {
545        #ifdef __CFA_DEBUG__
546        owner = 0p;
547        #endif
548        held = false;
549}
550
551static inline void on_notify(mcs_block_spin_lock & this, struct thread$ * t ) { unpark(t); }
552static inline size_t on_wait(mcs_block_spin_lock & this) { unlock(this); return 0; }
553static inline void on_wakeup(mcs_block_spin_lock & this, size_t recursion ) { }
554
555//-----------------------------------------------------------------------------
556// Block Spin Lock
557
558// - No reacquire for cond var
559// - No recursive acquisition
560// - No ownership
561// - Blocks but first node spins (like spin queue but blocking for not first thd)
562struct block_spin_lock {
563        // Spin lock used for mutual exclusion
564        fast_block_lock lock;
565
566        // flag showing if lock is held
567        bool held:1;
568
569        #ifdef __CFA_DEBUG__
570        // for deadlock detection
571        struct thread$ * owner;
572        #endif
573};
574
575static inline void  ?{}( block_spin_lock & this ) with(this) {
576        lock{};
577        held = false;
578}
579static inline void ^?{}( block_spin_lock & this ) {}
580static inline void ?{}( block_spin_lock & this, block_spin_lock this2 ) = void;
581static inline void ?=?( block_spin_lock & this, block_spin_lock this2 ) = void;
582
583// if this is called recursively IT WILL DEADLOCK!!!!!
584static inline void lock(block_spin_lock & this) with(this) {
585        #ifdef __CFA_DEBUG__
586        assert(!(held && owner == active_thread()));
587        #endif
588        lock( lock );
589        while(held) Pause();
590        held = true;
591        unlock( lock );
592        #ifdef __CFA_DEBUG__
593        owner = active_thread();
594        #endif
595}
596
597static inline void unlock(block_spin_lock & this) with(this) {
598        #ifdef __CFA_DEBUG__
599        owner = 0p;
600        #endif
601        held = false;
602}
603
604static inline void on_notify(block_spin_lock & this, struct thread$ * t ) { unpark(t); }
605static inline size_t on_wait(block_spin_lock & this) { unlock(this); return 0; }
606static inline void on_wakeup(block_spin_lock & this, size_t recursion ) { }
607
608//-----------------------------------------------------------------------------
609// is_blocking_lock
610trait is_blocking_lock(L & | sized(L)) {
611        // For synchronization locks to use when acquiring
612        void on_notify( L &, struct thread$ * );
613
614        // For synchronization locks to use when releasing
615        size_t on_wait( L & );
616
617        // to set recursion count after getting signalled;
618        void on_wakeup( L &, size_t recursion );
619};
620
621//-----------------------------------------------------------------------------
622// // info_thread
623// // the info thread is a wrapper around a thread used
624// // to store extra data for use in the condition variable
625forall(L & | is_blocking_lock(L)) {
626        struct info_thread;
627
628        // // for use by sequence
629        // info_thread(L) *& Back( info_thread(L) * this );
630        // info_thread(L) *& Next( info_thread(L) * this );
631}
632
633//-----------------------------------------------------------------------------
634// Synchronization Locks
635forall(L & | is_blocking_lock(L)) {
636
637        //-----------------------------------------------------------------------------
638        // condition_variable
639
640        // The multi-tool condition variable
641        // - can pass timeouts to wait for either a signal or timeout
642        // - can wait without passing a lock
643        // - can have waiters reacquire different locks while waiting on the same cond var
644        // - has shadow queue
645        // - can be signalled outside of critical sections with no locks held
646        struct condition_variable {
647                // Spin lock used for mutual exclusion
648                __spinlock_t lock;
649
650                // List of blocked threads
651                dlist( info_thread(L) ) blocked_threads;
652
653                // Count of current blocked threads
654                int count;
655        };
656
657
658        void  ?{}( condition_variable(L) & this );
659        void ^?{}( condition_variable(L) & this );
660
661        bool notify_one( condition_variable(L) & this );
662        bool notify_all( condition_variable(L) & this );
663
664        uintptr_t front( condition_variable(L) & this );
665
666        bool empty  ( condition_variable(L) & this );
667        int  counter( condition_variable(L) & this );
668
669        void wait( condition_variable(L) & this );
670        void wait( condition_variable(L) & this, uintptr_t info );
671        bool wait( condition_variable(L) & this, Duration duration );
672        bool wait( condition_variable(L) & this, uintptr_t info, Duration duration );
673
674        void wait( condition_variable(L) & this, L & l );
675        void wait( condition_variable(L) & this, L & l, uintptr_t info );
676        bool wait( condition_variable(L) & this, L & l, Duration duration );
677        bool wait( condition_variable(L) & this, L & l, uintptr_t info, Duration duration );
678
679        //-----------------------------------------------------------------------------
680        // fast_cond_var
681
682        // The trimmed and slim condition variable
683        // - no internal lock so you must hold a lock while using this cond var
684        // - signalling without holding branded lock is UNSAFE!
685        // - only allows usage of one lock, cond var is branded after usage
686
687        struct fast_cond_var {
688                // List of blocked threads
689                dlist( info_thread(L) ) blocked_threads;
690                #ifdef __CFA_DEBUG__
691                L * lock_used;
692                #endif
693        };
694
695        void  ?{}( fast_cond_var(L) & this );
696        void ^?{}( fast_cond_var(L) & this );
697
698        bool notify_one( fast_cond_var(L) & this );
699        bool notify_all( fast_cond_var(L) & this );
700
701        uintptr_t front( fast_cond_var(L) & this );
702        bool empty  ( fast_cond_var(L) & this );
703
704        void wait( fast_cond_var(L) & this, L & l );
705        void wait( fast_cond_var(L) & this, L & l, uintptr_t info );
706
707
708        //-----------------------------------------------------------------------------
709        // pthread_cond_var
710        //
711        // - cond var with minimal footprint
712        // - supports operations needed for phthread cond
713
714        struct pthread_cond_var {
715                dlist( info_thread(L) ) blocked_threads;
716                __spinlock_t lock;
717        };
718
719        void  ?{}( pthread_cond_var(L) & this );
720        void ^?{}( pthread_cond_var(L) & this );
721
722        bool notify_one( pthread_cond_var(L) & this );
723        bool notify_all( pthread_cond_var(L) & this );
724
725        uintptr_t front( pthread_cond_var(L) & this );
726        bool empty ( pthread_cond_var(L) & this );
727
728        void wait( pthread_cond_var(L) & this, L & l );
729        void wait( pthread_cond_var(L) & this, L & l, uintptr_t info );
730        bool wait( pthread_cond_var(L) & this, L & l, timespec t );
731        bool wait( pthread_cond_var(L) & this, L & l, uintptr_t info, timespec t );
732}
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