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libcfa/src/concurrency/ready_subqueue.hfa (modified) (5 diffs)
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libcfa/src/concurrency/ready_subqueue.hfa
r343d10e r9cc3a18 2 2 3 3 #define __CFA_NO_SCHED_STATS__ 4 5 #include "containers/queueLockFree.hfa" 4 6 5 7 // Intrusives lanes which are used by the relaxed ready queue 6 8 struct __attribute__((aligned(128))) __intrusive_lane_t { 7 9 8 // anchor for the head and the tail of the queue 9 __attribute__((aligned(128))) struct __sentinel_t { 10 // Link lists fields 11 // instrusive link field for threads 12 // must be exactly as in $thread 13 __thread_desc_link link; 14 } before, after; 10 #if defined(USE_MPSC) 11 mpsc_queue($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 15 22 16 23 // spin lock protecting the queue … … 35 42 // Get the head pointer (one before the first element) from the anchor 36 43 static inline $thread * head(const __intrusive_lane_t & this) { 37 $thread * rhead = ($thread *)( 38 (uintptr_t)( &this.before ) - offsetof( $thread, link ) 39 ); 40 /* paranoid */ verify(rhead); 41 return rhead; 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 42 53 } 43 54 44 55 // Get the tail pointer (one after the last element) from the anchor 45 56 static inline $thread * tail(const __intrusive_lane_t & this) { 46 $thread * rtail = ($thread *)( 47 (uintptr_t)( &this.after ) - offsetof( $thread, link ) 48 ); 49 /* paranoid */ verify(rtail); 50 return rtail; 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 51 66 } 52 67 … … 55 70 this.lock = false; 56 71 57 this.before.link.prev = 0p; 58 this.before.link.next = tail(this); 59 this.before.link.ts = 0; 60 61 this.after .link.prev = head(this); 62 this.after .link.next = 0p; 63 this.after .link.ts = 0; 64 65 #if !defined(__CFA_NO_SCHED_STATS__) 66 this.stat.diff = 0; 67 this.stat.push = 0; 68 this.stat.pop = 0; 69 #endif 70 71 // We add a boat-load of assertions here because the anchor code is very fragile 72 /* paranoid */ verify(((uintptr_t)( head(this) ) + offsetof( $thread, link )) == (uintptr_t)(&this.before)); 73 /* paranoid */ verify(((uintptr_t)( tail(this) ) + offsetof( $thread, link )) == (uintptr_t)(&this.after )); 74 /* paranoid */ verify(head(this)->link.prev == 0p ); 75 /* paranoid */ verify(head(this)->link.next == tail(this) ); 76 /* paranoid */ verify(tail(this)->link.next == 0p ); 77 /* paranoid */ verify(tail(this)->link.prev == head(this) ); 78 /* paranoid */ verify(&head(this)->link.prev == &this.before.link.prev ); 79 /* paranoid */ verify(&head(this)->link.next == &this.before.link.next ); 80 /* paranoid */ verify(&tail(this)->link.prev == &this.after .link.prev ); 81 /* paranoid */ verify(&tail(this)->link.next == &this.after .link.next ); 82 /* paranoid */ verify(__alignof__(__intrusive_lane_t) == 128); 83 /* paranoid */ verify(__alignof__(this) == 128); 84 /* paranoid */ verifyf(((intptr_t)(&this) % 128) == 0, "Expected address to be aligned %p %% 128 == %zd", &this, ((intptr_t)(&this) % 128)); 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 85 102 } 86 103 87 104 // Dtor is trivial 88 105 void ^?{}( __intrusive_lane_t & this ) { 89 // Make sure the list is empty 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) ); 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 94 113 } 95 114 … … 97 116 // returns true of lane was empty before push, false otherwise 98 117 bool push(__intrusive_lane_t & this, $thread * node) { 99 #if defined(__CFA_WITH_VERIFY__) 100 /* paranoid */ verify(this.lock); 101 /* paranoid */ verify(node->link.ts != 0); 102 /* paranoid */ verify(node->link.next == 0p); 103 /* paranoid */ verify(node->link.prev == 0p); 104 /* paranoid */ verify(tail(this)->link.next == 0p); 105 /* paranoid */ verify(head(this)->link.prev == 0p); 106 118 #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); 131 132 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 107 160 if(this.before.link.ts == 0l) { 108 /* paranoid */ verify(tail(this)->link.prev == head(this)); 109 /* paranoid */ verify(head(this)->link.next == tail(this)); 110 } else { 111 /* paranoid */ verify(tail(this)->link.prev != head(this)); 112 /* paranoid */ verify(head(this)->link.next != tail(this)); 113 } 114 #endif 115 116 // Get the relevant nodes locally 117 $thread * tail = tail(this); 118 $thread * prev = tail->link.prev; 119 120 // Do the push 121 node->link.next = tail; 122 node->link.prev = prev; 123 prev->link.next = node; 124 tail->link.prev = node; 125 126 // Update stats 127 #if !defined(__CFA_NO_SCHED_STATS__) 128 this.stat.diff++; 129 this.stat.push++; 130 #endif 131 132 verify(node->link.next == tail(this)); 133 134 // Check if the queue used to be empty 135 if(this.before.link.ts == 0l) { 136 this.before.link.ts = node->link.ts; 137 /* paranoid */ verify(node->link.prev == head(this)); 138 return true; 139 } 140 return false; 161 this.before.link.ts = node->link.ts; 162 /* paranoid */ verify(node->link.prev == head(this)); 163 return true; 164 } 165 return false; 166 #endif 141 167 } 142 168 … … 146 172 $thread * pop(__intrusive_lane_t & this) { 147 173 /* paranoid */ verify(this.lock); 148 /* paranoid */ verify(this.before.link.ts != 0ul); 149 150 // Get anchors locally 151 $thread * head = head(this); 152 $thread * tail = tail(this); 153 154 // Get the relevant nodes locally 155 $thread * node = head->link.next; 156 $thread * next = node->link.next; 157 158 /* paranoid */ verify(node != tail); 159 /* paranoid */ verify(node); 160 161 // Do the pop 162 head->link.next = next; 163 next->link.prev = head; 164 node->link.next = 0p; 165 node->link.prev = 0p; 166 167 // Update head time stamp 168 this.before.link.ts = next->link.ts; 169 170 // Update stats 171 #ifndef __CFA_NO_SCHED_STATS__ 172 this.stat.diff--; 173 this.stat.pop ++; 174 #endif 175 176 // Check if we emptied list and return accordingly 177 /* paranoid */ verify(tail(this)->link.next == 0p); 178 /* paranoid */ verify(head(this)->link.prev == 0p); 179 if(next == tail) { 180 /* paranoid */ verify(this.before.link.ts == 0); 181 /* paranoid */ verify(tail(this)->link.prev == head(this)); 182 /* paranoid */ verify(head(this)->link.next == tail(this)); 183 return node; 184 } 185 else { 186 /* paranoid */ verify(next->link.ts != 0); 187 /* paranoid */ verify(tail(this)->link.prev != head(this)); 188 /* paranoid */ verify(head(this)->link.next != tail(this)); 189 /* paranoid */ verify(this.before.link.ts != 0); 190 return node; 191 } 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); 181 182 // Get anchors locally 183 $thread * head = head(this); 184 $thread * tail = tail(this); 185 186 // Get the relevant nodes locally 187 $thread * node = head->link.next; 188 $thread * next = node->link.next; 189 190 /* 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 192 225 } 193 226 194 227 // Check whether or not list is empty 195 228 static inline bool is_empty(__intrusive_lane_t & this) { 196 // Cannot verify here since it may not be locked 197 return this.before.link.ts == 0; 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 198 235 } 199 236 200 237 // Return the timestamp 201 238 static inline unsigned long long ts(__intrusive_lane_t & this) { 202 // Cannot verify here since it may not be locked 203 return this.before.link.ts; 204 } 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 247 } 248 249 // Aligned timestamps which are used by the relaxed ready queue 250 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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