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083bb41b59
LogSeq/assets/ostep_1681115599584_0.edn
ridethepig 083bb41b59 OSTEP 33
2023-04-12 21:43:34 +08:00

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:content {:text "A critical section is a piece of code that accesses a shared variable (or more generally, a shared resource) and must not be concurrently executed by more than one thread."},
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:content {:text "mutual exclusion. This property guarantees that if one thread is executing within the critical section, the others will be prevented from doing so."},
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:content {:text " KEY CONCURRENCY TERMS"},
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:content {:text "Thread API"},
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:content {:text "locks help transform the chaos that is traditional OS scheduling into a more controlled activity."},
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:content {:text "efficacy "},
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:content {:text "A Failed Attempt: Just Using Loads/Stores"},
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:content {:text " use a simple variable (flag) to indicate whether some thread has possession of a lock."},
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:content {:text "Spin Locks with Test-And-Set"},
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:content {:text "Peterson’s algorithm"},
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:content {:text "est whether the value at the address specified by ptr is equal to expected; if so, update the memory location pointed to by ptr with the new value. If not, do nothing. "},
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:content {:text "Figure 28.10: Linux-based Futex Locks"},
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:content {:text "in the first phase, the lock spins for a while, hoping that it can acquire the lock."},
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:content {:text "A semaphore is an object with an integer value that we can manipulate with two routines;"},
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:content {:text "record the needed information to finish processing this event in some data structure; when the event happens (i.e., when the disk I/O completes), look up the needed information and process the event."},
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:content {:text "tilize more than one CPU,"},
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