Changeset 8d66610 for libcfa/src/concurrency/ready_subqueue.hfa
- Timestamp:
- May 21, 2021, 4:48:10 PM (5 years ago)
- Branches:
- ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, master, new-ast-unique-expr, pthread-emulation, qualifiedEnum
- Children:
- f1bce515
- Parents:
- 5407cdc (diff), 7404cdc (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the(diff)links above to see all the changes relative to each parent. - File:
-
- 1 edited
-
libcfa/src/concurrency/ready_subqueue.hfa (modified) (3 diffs)
Legend:
- Unmodified
- Added
- Removed
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libcfa/src/concurrency/ready_subqueue.hfa
r5407cdc r8d66610 7 7 // Intrusives lanes which are used by the relaxed ready queue 8 8 struct __attribute__((aligned(128))) __intrusive_lane_t { 9 10 #if defined(USE_MPSC) 11 mpsc_queue($thread) queue; 12 __attribute__((aligned(128))) 13 #else 14 // anchor for the head and the tail of the queue 15 __attribute__((aligned(128))) struct __sentinel_t { 16 // Link lists fields 17 // instrusive link field for threads 18 // must be exactly as in $thread 19 __thread_desc_link link; 20 } before, after; 21 #endif 9 struct $thread * prev; 22 10 23 11 // spin lock protecting the queue 24 12 volatile bool lock; 25 13 26 // Optional statistic counters 27 #if !defined(__CFA_NO_SCHED_STATS__) 28 struct __attribute__((aligned(64))) { 29 // difference between number of push and pops 30 ssize_t diff; 14 __thread_desc_link anchor; 31 15 32 // total number of pushes and pops 33 size_t push; 34 size_t pop ; 35 } stat; 16 #if !defined(__CFA_NO_STATISTICS__) 17 unsigned cnt; 36 18 #endif 37 19 }; 38 20 39 void ?{}(__intrusive_lane_t & this);40 void ^?{}(__intrusive_lane_t & this);41 42 21 // Get the head pointer (one before the first element) from the anchor 43 static inline $thread * head(const __intrusive_lane_t & this) { 44 #if defined(USE_MPSC) 45 return this.queue.head; 46 #else 47 $thread * rhead = ($thread *)( 48 (uintptr_t)( &this.before ) - offsetof( $thread, link ) 49 ); 50 /* paranoid */ verify(rhead); 51 return rhead; 52 #endif 53 } 54 55 // Get the tail pointer (one after the last element) from the anchor 56 static inline $thread * tail(const __intrusive_lane_t & this) { 57 #if defined(USE_MPSC) 58 return this.queue.tail; 59 #else 60 $thread * rtail = ($thread *)( 61 (uintptr_t)( &this.after ) - offsetof( $thread, link ) 62 ); 63 /* paranoid */ verify(rtail); 64 return rtail; 65 #endif 22 static inline $thread * mock_head(const __intrusive_lane_t & this) { 23 $thread * rhead = ($thread *)( 24 (uintptr_t)( &this.anchor ) - __builtin_offsetof( $thread, link ) 25 ); 26 return rhead; 66 27 } 67 28 … … 69 30 void ?{}( __intrusive_lane_t & this ) { 70 31 this.lock = false; 32 this.prev = mock_head(this); 33 this.anchor.next = 0p; 34 this.anchor.ts = 0; 35 #if !defined(__CFA_NO_STATISTICS__) 36 this.cnt = 0; 37 #endif 71 38 72 #if !defined(USE_MPSC) 73 this.before.link.prev = 0p; 74 this.before.link.next = tail(this); 75 this.before.link.ts = 0; 76 77 this.after .link.prev = head(this); 78 this.after .link.next = 0p; 79 this.after .link.ts = 0; 80 81 #if !defined(__CFA_NO_SCHED_STATS__) 82 this.stat.diff = 0; 83 this.stat.push = 0; 84 this.stat.pop = 0; 85 #endif 86 87 // We add a boat-load of assertions here because the anchor code is very fragile 88 /* paranoid */ verify(((uintptr_t)( head(this) ) + offsetof( $thread, link )) == (uintptr_t)(&this.before)); 89 /* paranoid */ verify(((uintptr_t)( tail(this) ) + offsetof( $thread, link )) == (uintptr_t)(&this.after )); 90 /* paranoid */ verify(head(this)->link.prev == 0p ); 91 /* paranoid */ verify(head(this)->link.next == tail(this) ); 92 /* paranoid */ verify(tail(this)->link.next == 0p ); 93 /* paranoid */ verify(tail(this)->link.prev == head(this) ); 94 /* paranoid */ verify(&head(this)->link.prev == &this.before.link.prev ); 95 /* paranoid */ verify(&head(this)->link.next == &this.before.link.next ); 96 /* paranoid */ verify(&tail(this)->link.prev == &this.after .link.prev ); 97 /* paranoid */ verify(&tail(this)->link.next == &this.after .link.next ); 98 /* paranoid */ verify(__alignof__(__intrusive_lane_t) == 128); 99 /* paranoid */ verify(__alignof__(this) == 128); 100 /* paranoid */ verifyf(((intptr_t)(&this) % 128) == 0, "Expected address to be aligned %p %% 128 == %zd", &this, ((intptr_t)(&this) % 128)); 101 #endif 39 // We add a boat-load of assertions here because the anchor code is very fragile 40 /* paranoid */ _Static_assert( offsetof( $thread, link ) == offsetof(__intrusive_lane_t, anchor) ); 41 /* paranoid */ verify( offsetof( $thread, link ) == offsetof(__intrusive_lane_t, anchor) ); 42 /* paranoid */ verify( ((uintptr_t)( mock_head(this) ) + offsetof( $thread, link )) == (uintptr_t)(&this.anchor) ); 43 /* paranoid */ verify( &mock_head(this)->link.next == &this.anchor.next ); 44 /* paranoid */ verify( &mock_head(this)->link.ts == &this.anchor.ts ); 45 /* paranoid */ verify( mock_head(this)->link.next == 0p ); 46 /* paranoid */ verify( mock_head(this)->link.ts == 0 ); 47 /* paranoid */ verify( mock_head(this) == this.prev ); 48 /* paranoid */ verify( __alignof__(__intrusive_lane_t) == 128 ); 49 /* paranoid */ verify( __alignof__(this) == 128 ); 50 /* paranoid */ verifyf( ((intptr_t)(&this) % 128) == 0, "Expected address to be aligned %p %% 128 == %zd", &this, ((intptr_t)(&this) % 128) ); 102 51 } 103 52 104 53 // Dtor is trivial 105 54 void ^?{}( __intrusive_lane_t & this ) { 106 #if !defined(USE_MPSC) 107 // Make sure the list is empty 108 /* paranoid */ verify(head(this)->link.prev == 0p ); 109 /* paranoid */ verify(head(this)->link.next == tail(this) ); 110 /* paranoid */ verify(tail(this)->link.next == 0p ); 111 /* paranoid */ verify(tail(this)->link.prev == head(this) ); 112 #endif 55 // Make sure the list is empty 56 /* paranoid */ verify( this.anchor.next == 0p ); 57 /* paranoid */ verify( this.anchor.ts == 0 ); 58 /* paranoid */ verify( mock_head(this) == this.prev ); 113 59 } 114 60 115 61 // Push a thread onto this lane 116 62 // returns true of lane was empty before push, false otherwise 117 bool push(__intrusive_lane_t & this, $thread * node) { 118 #if defined(USE_MPSC) 119 inline $thread * volatile & ?`next ( $thread * this ) __attribute__((const)) { 120 return this->link.next; 121 } 122 push(this.queue, node); 123 #else 124 #if defined(__CFA_WITH_VERIFY__) 125 /* paranoid */ verify(this.lock); 126 /* paranoid */ verify(node->link.ts != 0); 127 /* paranoid */ verify(node->link.next == 0p); 128 /* paranoid */ verify(node->link.prev == 0p); 129 /* paranoid */ verify(tail(this)->link.next == 0p); 130 /* paranoid */ verify(head(this)->link.prev == 0p); 63 static inline void push( __intrusive_lane_t & this, $thread * node ) { 64 /* paranoid */ verify( this.lock ); 65 /* paranoid */ verify( node->link.next == 0p ); 66 /* paranoid */ verify( node->link.ts == 0 ); 67 /* paranoid */ verify( this.prev->link.next == 0p ); 68 /* paranoid */ verify( this.prev->link.ts == 0 ); 69 if( this.anchor.next == 0p ) { 70 /* paranoid */ verify( this.anchor.next == 0p ); 71 /* paranoid */ verify( this.anchor.ts == 0 ); 72 /* paranoid */ verify( this.prev == mock_head( this ) ); 73 } else { 74 /* paranoid */ verify( this.anchor.next != 0p ); 75 /* paranoid */ verify( this.anchor.ts != 0 ); 76 /* paranoid */ verify( this.prev != mock_head( this ) ); 77 } 131 78 132 if(this.before.link.ts == 0l) { 133 /* paranoid */ verify(tail(this)->link.prev == head(this)); 134 /* paranoid */ verify(head(this)->link.next == tail(this)); 135 } else { 136 /* paranoid */ verify(tail(this)->link.prev != head(this)); 137 /* paranoid */ verify(head(this)->link.next != tail(this)); 138 } 139 #endif 140 141 // Get the relevant nodes locally 142 $thread * tail = tail(this); 143 $thread * prev = tail->link.prev; 144 145 // Do the push 146 node->link.next = tail; 147 node->link.prev = prev; 148 prev->link.next = node; 149 tail->link.prev = node; 150 151 // Update stats 152 #if !defined(__CFA_NO_SCHED_STATS__) 153 this.stat.diff++; 154 this.stat.push++; 155 #endif 156 157 verify(node->link.next == tail(this)); 158 159 // Check if the queue used to be empty 160 if(this.before.link.ts == 0l) { 161 this.before.link.ts = node->link.ts; 162 /* paranoid */ verify(node->link.prev == head(this)); 163 return true; 164 } 165 return false; 79 // Get the relevant nodes locally 80 this.prev->link.next = node; 81 this.prev->link.ts = rdtscl(); 82 this.prev = node; 83 #if !defined(__CFA_NO_STATISTICS__) 84 this.cnt++; 166 85 #endif 167 86 } … … 170 89 // returns popped 171 90 // returns true of lane was empty before push, false otherwise 172 $thread * pop(__intrusive_lane_t & this) { 173 /* paranoid */ verify(this.lock); 174 #if defined(USE_MPSC) 175 inline $thread * volatile & ?`next ( $thread * this ) __attribute__((const)) { 176 return this->link.next; 177 } 178 return pop(this.queue); 179 #else 180 /* paranoid */ verify(this.before.link.ts != 0ul); 91 static inline [* $thread, unsigned long long] pop( __intrusive_lane_t & this ) { 92 /* paranoid */ verify( this.lock ); 93 /* paranoid */ verify( this.anchor.next != 0p ); 94 /* paranoid */ verify( this.anchor.ts != 0 ); 181 95 182 // Get anchors locally 183 $thread * head = head(this); 184 $thread * tail = tail(this); 96 // Get the relevant nodes locally 97 unsigned long long ts = this.anchor.ts; 98 $thread * node = this.anchor.next; 99 this.anchor.next = node->link.next; 100 this.anchor.ts = node->link.ts; 101 bool is_empty = this.anchor.ts == 0; 102 node->link.next = 0p; 103 node->link.ts = 0; 104 #if !defined(__CFA_NO_STATISTICS__) 105 this.cnt--; 106 #endif 185 107 186 // Get the relevant nodes locally 187 $thread * node = head->link.next; 188 $thread * next = node->link.next; 108 // Update head time stamp 109 if(is_empty) this.prev = mock_head( this ); 189 110 190 /* paranoid */ verify(node != tail); 191 /* paranoid */ verify(node); 192 193 // Do the pop 194 head->link.next = next; 195 next->link.prev = head; 196 node->link.next = 0p; 197 node->link.prev = 0p; 198 199 // Update head time stamp 200 this.before.link.ts = next->link.ts; 201 202 // Update stats 203 #ifndef __CFA_NO_SCHED_STATS__ 204 this.stat.diff--; 205 this.stat.pop ++; 206 #endif 207 208 // Check if we emptied list and return accordingly 209 /* paranoid */ verify(tail(this)->link.next == 0p); 210 /* paranoid */ verify(head(this)->link.prev == 0p); 211 if(next == tail) { 212 /* paranoid */ verify(this.before.link.ts == 0); 213 /* paranoid */ verify(tail(this)->link.prev == head(this)); 214 /* paranoid */ verify(head(this)->link.next == tail(this)); 215 return node; 216 } 217 else { 218 /* paranoid */ verify(next->link.ts != 0); 219 /* paranoid */ verify(tail(this)->link.prev != head(this)); 220 /* paranoid */ verify(head(this)->link.next != tail(this)); 221 /* paranoid */ verify(this.before.link.ts != 0); 222 return node; 223 } 224 #endif 111 /* paranoid */ verify( node->link.next == 0p ); 112 /* paranoid */ verify( node->link.ts == 0 ); 113 return [node, ts]; 225 114 } 226 115 227 116 // Check whether or not list is empty 228 117 static inline bool is_empty(__intrusive_lane_t & this) { 229 #if defined(USE_MPSC) 230 return this.queue.head == 0p; 231 #else 232 // Cannot verify here since it may not be locked 233 return this.before.link.ts == 0; 234 #endif 118 return this.anchor.ts == 0; 235 119 } 236 120 237 121 // Return the timestamp 238 122 static inline unsigned long long ts(__intrusive_lane_t & this) { 239 #if defined(USE_MPSC) 240 $thread * tl = this.queue.head; 241 if(!tl) return -1ull; 242 return tl->link.ts; 243 #else 244 // Cannot verify here since it may not be locked 245 return this.before.link.ts; 246 #endif 123 // Cannot verify here since it may not be locked 124 return this.anchor.ts; 247 125 } 248 249 // Aligned timestamps which are used by the relaxed ready queue250 struct __attribute__((aligned(128))) __timestamp_t {251 volatile unsigned long long tv;252 };253 254 void ?{}(__timestamp_t & this) { this.tv = 0; }255 void ^?{}(__timestamp_t & this) {}
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