四川丹甫制冷压缩机股份有限公司招学习教案

1、四川丹甫制冷压缩机股份四川丹甫制冷压缩机股份(gfn)有限公有限公司招司招第一页，共29页。Reminder: notation = atomic第1页/共29页第二页，共29页。第2页/共29页第三页，共29页。while (1) .other stuff.critical sectionThe Critical Section ProblemP(mutex)V(mutex)Semaphore:mutex initially 1Fill in the boxes第3页/共29页第四页，共29页。第4页/共29页第五页，共29页。P(emptybuf);V(fullbuf);P(fullbuf

2、);V(emptybuf);Semaphores: emptybuf initially N; fullbuf initially 0;第5页/共29页第六页，共29页。第6页/共29页第七页，共29页。If dee goes first to sleep, the wakeup is lost (since dum isntsleeping yet). Both sleep forever.第7页/共29页第八页，共29页。void Tweedledee() while(1) x = Quarrel(x); Wakeup(Tweedledum); Sleep(); P(dum);V(dee)

3、;semaphore dee = 0;semaphore dum = 0;V(dum);P(dee):第8页/共29页第九页，共29页。monitor_lockenQdeQinitshared dataentry queuenotEmptyconditions第9页/共29页第十页，共29页。第10页/共29页第十一页，共29页。第11页/共29页第十二页，共29页。monitor_lockenQdeQinitshared dataentry queuenotEmptyconditions第12页/共29页第十三页，共29页。monitor_lockenQdeQinitshared datae

4、ntry queuenotEmptyconditions第13页/共29页第十四页，共29页。EnQ:Lock-Acquire ( );if (head = null)head = item;notEmpty-Signal (Lock);else tail-next = item;tail = item; Lock-Release( );deQ:Lock-Acquire (lock);if (head = null)notEmpty-Wait (lock); item = head; if (tail = head) tail = null; head=item-next;Lock-Relea

5、se( ); monitor_lockenQdeQinitshared dataentry queuenotEmptyconditions第14页/共29页第十五页，共29页。EnQ:Lock-Acquire ( );if (head = null)head = item;notEmpty-Signal (Lock);else tail-next = item;tail = item; Lock-Release( );deQ:Lock-Acquire (lock);if (head = null)notEmpty-Wait (lock); item = head; if (tail = hea

6、d) tail = null; head=item-next;Lock-Release( ); monitor_lockenQdeQinitshared dataentry queuenotEmptyconditions第15页/共29页第十六页，共29页。EnQ:Lock-Acquire ( );if (head = null)head = item;notEmpty-Signal (Lock);else tail-next = item;tail = item; Lock-Release( );deQ:Lock-Acquire (lock);if (head = null)notEmpty

7、-Wait (lock); item = head; if (tail = head) tail = null; head=item-next;Lock-Release( ); monitor_lockenQdeQinitshared dataentry queuenotEmptyconditions第16页/共29页第十七页，共29页。EnQ:Lock-Acquire ( );if (head = null)head = item;notEmpty-Signal (Lock);else tail-next = item;tail = item; Lock-Release( );deQ:Loc

8、k-Acquire (lock);if (head = null)notEmpty-Wait (lock); item = head; if (tail = head) tail = null; head=item-next;Lock-Release( ); monitor_lockenQdeQinitshared dataentry queuenotEmptyconditions第17页/共29页第十八页，共29页。第18页/共29页第十九页，共29页。Philosopher 0Philosopher 1Philosopher 2Philosopher 3Philosopher 4while

9、(food available)pick up 2 adj. forks; eat; put down forks; think awhile;第19页/共29页第二十页，共29页。第20页/共29页第二十一页，共29页。P(forkleft(me);P(forkright(me);V(forkleft(me);V(forkright(me);Does this work?第21页/共29页第二十二页，共29页。InterleavingP(R1)P(R2)P(R1) waitsP(R2) waitsR1 and R2 initially 1 (binary semaphore)第22页/共29

10、页第二十三页，共29页。第23页/共29页第二十四页，共29页。第24页/共29页第二十五页，共29页。第25页/共29页第二十六页，共29页。Circular Wait Condition第26页/共29页第二十七页，共29页。while (food available)P(mutex); while (forks me != 2) blockingme = true; V(mutex); P(sleepyme); P(mutex);forks leftneighbor(me) -; forks rightneighbor(me)-;V(mutex):eat;P(mutex); forks

11、leftneighbor(me) +; forks rightneighbor(me)+;if (blockingleftneighbor(me) blocking leftneighbor(me) = false; V(sleepyleftneighbor(me); if (blockingrightneighbor(me) blockingrightneighbor(me) = false; V(sleepyrightneighbor(me); V(mutex); think awhile; 第27页/共29页第二十八页，共29页。$rZoWkThQeMbJ7G4D1z-w*t!qYmVj

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