Persistence

Operating System: Three Easy Pieces --- Locks: Test and Set (Note)

摘要： Because disabling interrupts does not work on multiple processors, system designers started toinvent hardware support for locking. The earliest multip... 阅读全文

posted @ 2015-11-24 13:36 Persistence 阅读(515) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Locks: Pthread Locks (Note)

摘要： The name that the POSIX library uses for a lock is mutex, as it is used to provide mutual exclusionbetween threads, i.e., if one thread is in the crit... 阅读全文

posted @ 2015-11-22 12:53 Persistence 阅读(308) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Locks (Note)

摘要： From the introduction to concurrency, we saw one of the fundamental problems in concurrentprogramming: we could like to execute a series of instructio... 阅读全文

posted @ 2015-11-22 11:22 Persistence 阅读(173) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Condition Variables (Note)

摘要： The other major component of any threads library, and certainly the case with POSIX threads, isthe presence of a condition variable. Condition variabl... 阅读全文

posted @ 2015-11-19 13:14 Persistence 阅读(229) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Locks (Note)

摘要： Beyond thread creation and join, probably the next most useful set of functions provided by thePOSIX threads library are those for providing mutual ex... 阅读全文

posted @ 2015-11-19 13:02 Persistence 阅读(198) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Thread API (Note)

摘要： This chapter briefly covers the main properties of the thread API. Each part will be explainedfurther in the subsequent chapters, as we know how to us... 阅读全文

posted @ 2015-11-15 08:52 Persistence 阅读(274) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- One More Problem (Note)

摘要： This chapter has set up the problem of concurrency as if only one type of interaction occursbetween threads, that of accessing shared variables and th... 阅读全文

posted @ 2015-11-13 13:35 Persistence 阅读(269) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Performing the Process Switch

摘要： A process switch may occur at just one one well-defined point: the schedule() function, which is discussedat length in Chapter 7. Here, we are only co... 阅读全文

posted @ 2015-11-13 11:01 Persistence 阅读(191) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Process Switch

摘要： To control the execution of process, the kernel must be able to suspend the execution of the processrunning on the CPU and resume the execution of som... 阅读全文

posted @ 2015-11-13 06:32 Persistence 阅读(255) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- The Wish For Atomicity (Note)

摘要： One way to solve this problem would be to have more powerful instructions that, in a singlestep, did exactly whatever we needed done and thus removed ... 阅读全文

posted @ 2015-11-11 13:43 Persistence 阅读(248) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Handling Wait Queues

摘要： A new wait queue head may be defined by using the DECLARE_WAIT_QUEUE_HEAD(name) macro,which statically declares a new wait queue head variable called ... 阅读全文

posted @ 2015-11-10 12:39 Persistence 阅读(181) 评论(0) 推荐(0)

ULK --- Chap3 Processes: How Processes Are Organized

摘要： The runqueue lists group all processes in a TASK_RUNNING state. When it comes to groupingprocesses in other states, the various states call for differ... 阅读全文

posted @ 2015-11-09 09:07 Persistence 阅读(171) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Relationships Among Processes

摘要： Processes created by a program have a parent/child relationship. When a process creates multiple children,these children have sibling relationships. S... 阅读全文

posted @ 2015-11-09 08:32 Persistence 阅读(119) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Lists of Tasking_Running processes

摘要： When looking for a new process to run on a CPU, the kernel has to consider only the runnable processes(that is, the processes in the TASK_RUNNING stat... 阅读全文

posted @ 2015-11-09 06:37 Persistence 阅读(188) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Doubly linked lists

摘要： Before moving to and describing how the kernel keeps track of the various processes in the system,we would like to emphasize the role of special data ... 阅读全文

posted @ 2015-11-09 05:27 Persistence 阅读(235) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Locks: Test and Set (Note)

Operating System: Three Easy Pieces --- Locks: Pthread Locks (Note)

Operating System: Three Easy Pieces --- Locks (Note)

Operating System: Three Easy Pieces --- Condition Variables (Note)

Operating System: Three Easy Pieces --- Locks (Note)

Operating System: Three Easy Pieces --- Thread API (Note)

Operating System: Three Easy Pieces --- One More Problem (Note)

ULK --- Chap3 Processes: Performing the Process Switch

ULK --- Chap3 Processes: Process Switch

Operating System: Three Easy Pieces --- The Wish For Atomicity (Note)

ULK --- Chap3 Processes: Handling Wait Queues

ULK --- Chap3 Processes: How Processes Are Organized

ULK --- Chap3 Processes: Relationships Among Processes

ULK --- Chap3 Processes: Lists of Tasking_Running processes

ULK --- Chap3 Processes: Doubly linked lists

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