source: libcfa/src/concurrency/locks.cfa @ dff1fd1

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since dff1fd1 was dff1fd1, checked in by Colby Alexander Parsons <caparsons@…>, 10 months ago

added bool return to timeout routines and removed redundant listed field

  • Property mode set to 100644
File size: 11.7 KB
Line 
1#include "locks.hfa"
2#include "kernel_private.hfa"
3#include <stdlib.h>
4#include <stdio.h>
5
6#include <kernel.hfa>
7#include <stdlib.hfa>
8#include <thread.hfa>
9
10///////////////////////////////////////////////////////////////////
11//// info_thread
12///////////////////////////////////////////////////////////////////
13
14forall(dtype L | is_blocking_lock(L)) {
15        void ?{}( info_thread(L) & this, $thread * t ) {
16                ((Seqable &) this){};
17                this.t = t;
18                this.lock = 0p;
19        }
20
21        void ?{}( info_thread(L) & this, $thread * t, uintptr_t info ) {
22                ((Seqable &) this){};
23                this.t = t;
24                this.info = info;
25                this.lock = 0p;
26        }
27
28        void ^?{}( info_thread(L) & this ){ }
29
30        info_thread(L) *& Back( info_thread(L) * this ) {
31                return (info_thread(L) *)Back( (Seqable *)this );
32        }
33
34        info_thread(L) *& Next( info_thread(L) * this ) {
35                return (info_thread(L) *)Next( (Colable *)this );
36        }
37}
38
39///////////////////////////////////////////////////////////////////
40//// Blocking Locks
41///////////////////////////////////////////////////////////////////
42
43void ?{}( blocking_lock & this, bool multi_acquisition, bool strict_owner ) {
44        this.lock{};
45        this.blocked_threads{};
46        this.wait_count = 0;
47        this.multi_acquisition = multi_acquisition;
48        this.strict_owner = strict_owner;
49        this.owner = 0p;
50        this.recursion_count = 0;
51}
52
53void ^?{}( blocking_lock & this ) {}
54void ?{}( single_acquisition_lock & this ) {((blocking_lock &)this){ false, false };}
55void ^?{}( single_acquisition_lock & this ) {}
56void ?{}( owner_lock & this ) {((blocking_lock &)this){ true, true };}
57void ^?{}( owner_lock & this ) {}
58void ?{}( multiple_acquisition_lock & this ) {((blocking_lock &)this){ true, false };}
59void ^?{}( multiple_acquisition_lock & this ) {}
60
61void lock( blocking_lock & this ) with( this ) {
62        lock( lock __cfaabi_dbg_ctx2 );
63        if ( owner == active_thread() && !multi_acquisition) {
64                abort("A single acquisition lock holder attempted to reacquire the lock resulting in a deadlock.");
65        } else if ( owner != 0p && owner != active_thread() ) {
66                addTail( blocked_threads, *active_thread() );
67                wait_count++;
68                unlock( lock );
69                park( );
70        } else if ( owner == active_thread() && multi_acquisition ) {
71                recursion_count++;
72                unlock( lock );
73        } else {
74                owner = active_thread();
75                recursion_count = 1;
76                unlock( lock );
77        }
78}
79
80bool try_lock( blocking_lock & this ) with( this ) {
81        bool ret = false;
82        lock( lock __cfaabi_dbg_ctx2 );
83        if ( owner == 0p ) {
84                owner = active_thread();
85                recursion_count = 1;
86                ret = true;
87        } else if ( owner == active_thread() && multi_acquisition ) {
88                recursion_count++;
89                ret = true;
90        }
91        unlock( lock );
92        return ret;
93}
94
95void unlock_error_check( blocking_lock & this ) with( this ) {
96        if ( owner == 0p ){ // no owner implies lock isn't held
97                abort( "There was an attempt to release a lock that isn't held" );
98        } else if ( strict_owner && owner != active_thread() ) {
99                abort( "A thread other than the owner attempted to release an owner lock" );
100        }
101}
102
103void pop_and_set_new_owner( blocking_lock & this ) with( this ) {
104        $thread * t = &dropHead( blocked_threads );
105        owner = t;
106        recursion_count = ( t ? 1 : 0 );
107        wait_count--;
108        unpark( t );
109}
110
111void unlock( blocking_lock & this ) with( this ) {
112        lock( lock __cfaabi_dbg_ctx2 );
113        unlock_error_check( this );
114        recursion_count--;
115        if ( recursion_count == 0 ) {
116                pop_and_set_new_owner( this );
117        }
118        unlock( lock );
119}
120
121size_t wait_count( blocking_lock & this ) with( this ) {
122        return wait_count;
123}
124
125void set_recursion_count( blocking_lock & this, size_t recursion ) with( this ) {
126        recursion_count = recursion;
127}
128
129size_t get_recursion_count( blocking_lock & this ) with( this ) {
130        return recursion_count;
131}
132
133void add_( blocking_lock & this, $thread * t ) with( this ) {
134    lock( lock __cfaabi_dbg_ctx2 );
135        if ( owner != 0p ) {
136                addTail( blocked_threads, *t );
137                wait_count++;
138                unlock( lock );
139        } else {
140                owner = t;
141                recursion_count = 1;
142                unpark( t );
143                unlock( lock );
144        }
145}
146
147void remove_( blocking_lock & this ) with( this ) {
148    lock( lock __cfaabi_dbg_ctx2 );
149        unlock_error_check( this );
150        pop_and_set_new_owner( this );
151        unlock( lock );
152}
153
154///////////////////////////////////////////////////////////////////
155//// Overloaded routines for traits
156///////////////////////////////////////////////////////////////////
157
158// This is temporary until an inheritance bug is fixed
159
160void lock( single_acquisition_lock & this ){ lock( (blocking_lock &)this ); }
161void unlock( single_acquisition_lock & this ){ unlock( (blocking_lock &)this ); }
162void add_( single_acquisition_lock & this, struct $thread * t ){ add_( (blocking_lock &)this, t ); }
163void remove_( single_acquisition_lock & this ){ remove_( (blocking_lock &)this ); }
164void set_recursion_count( single_acquisition_lock & this, size_t recursion ){ set_recursion_count( (blocking_lock &)this, recursion ); }
165size_t get_recursion_count( single_acquisition_lock & this ){ return get_recursion_count( (blocking_lock &)this ); }
166
167void lock( owner_lock & this ){ lock( (blocking_lock &)this ); }
168void unlock( owner_lock & this ){ unlock( (blocking_lock &)this ); }
169void add_( owner_lock & this, struct $thread * t ){ add_( (blocking_lock &)this, t ); }
170void remove_( owner_lock & this ){ remove_( (blocking_lock &)this ); }
171void set_recursion_count( owner_lock & this, size_t recursion ){ set_recursion_count( (blocking_lock &)this, recursion ); }
172size_t get_recursion_count( owner_lock & this ){ return get_recursion_count( (blocking_lock &)this ); }
173
174void lock( multiple_acquisition_lock & this ){ lock( (blocking_lock &)this ); }
175void unlock( multiple_acquisition_lock & this ){ unlock( (blocking_lock &)this ); }
176void add_( multiple_acquisition_lock & this, struct $thread * t ){ add_( (blocking_lock &)this, t ); }
177void remove_( multiple_acquisition_lock & this ){ remove_( (blocking_lock &)this ); }
178void set_recursion_count( multiple_acquisition_lock & this, size_t recursion ){ set_recursion_count( (blocking_lock &)this, recursion ); }
179size_t get_recursion_count( multiple_acquisition_lock & this ){ return get_recursion_count( (blocking_lock &)this ); }
180
181///////////////////////////////////////////////////////////////////
182//// condition variable
183///////////////////////////////////////////////////////////////////
184
185forall(dtype L | is_blocking_lock(L)) {
186
187        void timeout_handler ( alarm_node_wrap(L) & this ) with( this ) {
188        // This condition_variable member is called from the kernel, and therefore, cannot block, but it can spin.
189            lock( cond->lock __cfaabi_dbg_ctx2 );
190            if ( listed(i) ) {                  // is thread on queue
191                i->signalled = false;
192                cond->last_thread = i;          // REMOVE THIS AFTER DEBUG
193                        remove( cond->blocked_threads, *i );             //remove this thread O(1)
194                        cond->count--;
195                        if( !i->lock ) {
196                                unpark( i->t );
197                } else {
198                        add_(*i->lock, i->t);                   // call lock's add_
199                }
200            }
201            unlock( cond->lock );
202        }
203
204        void alarm_node_wrap_cast( alarm_node_t & a ) { timeout_handler( (alarm_node_wrap(L) &)a ); }
205
206        void ?{}( condition_variable(L) & this ){
207                this.lock{};
208                this.blocked_threads{};
209                this.count = 0;
210                this.last_thread = 0p; // REMOVE AFTER DEBUG
211        }
212
213        void ^?{}( condition_variable(L) & this ){ }
214
215        void ?{}( alarm_node_wrap(L) & this, Time alarm, Duration period, Alarm_Callback callback ) {
216                this.alarm_node{ callback, alarm, period };
217        }
218
219        void ^?{}( alarm_node_wrap(L) & this ) { }
220
221        void process_popped( condition_variable(L) & this, info_thread(L) & popped ) with( this ) {
222                if(&popped != 0p) {
223                        popped.signalled = true;
224                        count--;
225                        if (popped.lock) {
226                                add_(*popped.lock, popped.t);
227                        } else {
228                                unpark(popped.t);
229                        }
230                }
231        }
232
233        bool notify_one( condition_variable(L) & this ) with( this ) {
234                lock( lock __cfaabi_dbg_ctx2 );
235                bool ret = !empty(blocked_threads);
236                process_popped(this, dropHead( blocked_threads ));
237                unlock( lock );
238                return ret;
239        }
240
241        bool notify_all( condition_variable(L) & this ) with(this) {
242                lock( lock __cfaabi_dbg_ctx2 );
243                bool ret = !empty(blocked_threads);
244                while( !empty(blocked_threads) ) {
245                        process_popped(this, dropHead( blocked_threads ));
246                }
247                unlock( lock );
248                return ret;
249        }
250
251        uintptr_t front( condition_variable(L) & this ) with(this) {
252                return empty(blocked_threads) ? NULL : head(blocked_threads).info;
253        }
254
255        bool empty( condition_variable(L) & this ) with(this) { return empty(blocked_threads); }
256
257        int counter( condition_variable(L) & this ) with(this) { return count; }
258
259        size_t queue_and_get_recursion( condition_variable(L) & this, info_thread(L) * i ) with(this) {
260                addTail( blocked_threads, *i );
261                count++;
262                size_t recursion_count = 0;
263                if (i->lock) {
264                        recursion_count = get_recursion_count(*i->lock);
265                        remove_( *i->lock );
266                }
267                return recursion_count;
268        }
269
270        // helper for wait()'s' with no timeout
271        void queue_info_thread( condition_variable(L) & this, info_thread(L) & i ) with(this) {
272                lock( lock __cfaabi_dbg_ctx2 );
273                size_t recursion_count = queue_and_get_recursion(this, &i);
274                unlock( lock );
275                park( ); // blocks here
276                if (i.lock) set_recursion_count(*i.lock, recursion_count); // resets recursion count here after waking
277        }
278
279        // helper for wait()'s' with a timeout
280        void queue_info_thread_timeout( condition_variable(L) & this, info_thread(L) & info, Time t ) with(this) {
281                lock( lock __cfaabi_dbg_ctx2 );
282                size_t recursion_count = queue_and_get_recursion(this, &info);
283                alarm_node_wrap(L) node_wrap = { t, 0`s, alarm_node_wrap_cast };
284                node_wrap.cond = &this;
285                node_wrap.i = &info;
286                register_self( &node_wrap.alarm_node );
287                unlock( lock );
288                park();
289                unregister_self( &node_wrap.alarm_node );
290                if (info.lock) set_recursion_count(*info.lock, recursion_count);
291        }
292
293        void wait( condition_variable(L) & this ) with(this) {
294                info_thread( L ) i = { active_thread() };
295                queue_info_thread( this, i );
296        }
297
298        void wait( condition_variable(L) & this, uintptr_t info ) with(this) {
299                info_thread( L ) i = { active_thread(), info };
300                queue_info_thread( this, i );
301        }
302       
303        bool wait( condition_variable(L) & this, Duration duration ) with(this) {
304                info_thread( L ) i = { active_thread() };
305                queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
306                return i.signalled;
307        }
308
309        bool wait( condition_variable(L) & this, uintptr_t info, Duration duration ) with(this) {
310                info_thread( L ) i = { active_thread(), info };
311                queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
312                return i.signalled;
313        }
314
315        bool wait( condition_variable(L) & this, Time time ) with(this) {
316                info_thread( L ) i = { active_thread() };
317                queue_info_thread_timeout(this, i, time);
318                return i.signalled;
319        }
320
321        bool wait( condition_variable(L) & this, uintptr_t info, Time time ) with(this) {
322                info_thread( L ) i = { active_thread(), info };
323                queue_info_thread_timeout(this, i, time);
324                return i.signalled;
325        }
326
327        void wait( condition_variable(L) & this, L & l ) with(this) {
328                info_thread(L) i = { active_thread() };
329                i.lock = &l;
330                queue_info_thread( this, i );
331        }
332
333        void wait( condition_variable(L) & this, L & l, uintptr_t info ) with(this) {
334                info_thread(L) i = { active_thread(), info };
335                i.lock = &l;
336                queue_info_thread( this, i );
337        }
338       
339        bool wait( condition_variable(L) & this, L & l, Duration duration ) with(this) {
340                info_thread(L) i = { active_thread() };
341                i.lock = &l;
342                queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
343                return i.signalled;
344        }
345       
346        bool wait( condition_variable(L) & this, L & l, uintptr_t info, Duration duration ) with(this) {
347                info_thread(L) i = { active_thread(), info };
348                i.lock = &l;
349                queue_info_thread_timeout(this, i, __kernel_get_time() + duration );
350                return i.signalled;
351        }
352       
353        bool wait( condition_variable(L) & this, L & l, Time time ) with(this) {
354                info_thread(L) i = { active_thread() };
355                i.lock = &l;
356                queue_info_thread_timeout(this, i, time );
357                return i.signalled;
358        }
359       
360        bool wait( condition_variable(L) & this, L & l, uintptr_t info, Time time ) with(this) {
361                info_thread(L) i = { active_thread(), info };
362                i.lock = &l;
363                queue_info_thread_timeout(this, i, time );
364                return i.signalled;
365        }
366}
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