Persistence

Operating System: Three Easy Pieces --- Why It Gets Worse: Shared Data (Note)

摘要： The simple thread example we showed above was useful in showing how threads arecreated and how they can run in different orders depending on how the s... 阅读全文

posted @ 2015-11-06 13:43 Persistence 阅读(172) 评论(0) 推荐(0)

Operating System: Three Easy Pieces ---An Example: Thread Creation (Note)

摘要： Let's say we wanted to run a program that created two threads, each of which was doingsome independently work, in this case printing "A" or "B". The c... 阅读全文

posted @ 2015-11-05 13:32 Persistence 阅读(135) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Process Descriptor Handling

摘要： Processes are dynamic entities whose lifetimes range from a few milliseconds to months. Thus, thekernel must be able to handle many processes at the s... 阅读全文

posted @ 2015-11-05 08:38 Persistence 阅读(140) 评论(0) 推荐(0)

ULK --- Chap3 Processes: Identifying a Process

摘要： As a general rule, each execution context that can be independently scheduled must have its ownprocess descriptor; therefore, even lightweight process... 阅读全文

posted @ 2015-11-05 06:18 Persistence 阅读(182) 评论(0) 推荐(0)

ULK --- Chap3 Processes

摘要： The concept of a process is fundamental to any multiprogramming operating system. A processis usually defined as an instance of a program in execution... 阅读全文

posted @ 2015-11-05 01:48 Persistence 阅读(837) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Concurrency: An Introduction (Note)

摘要： Thus far, we have seen the development of the basic abstractions that the OS performs. We haveseen how to take a single physical CPU and turn it into ... 阅读全文

posted @ 2015-11-04 22:57 Persistence 阅读(139) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Concurrent Linked Lists (Note)

摘要： We next examine a more complicated structure, the linked list. Let's start with a basic approachonce again. For simplicity, we will omit some of the o... 阅读全文

posted @ 2015-11-03 13:42 Persistence 阅读(154) 评论(0) 推荐(0)

Operating System: Three Easy Pieces --- Lock Concurrent Data Structures (Note)

摘要： Before moving beyong locks, we will first describe how to use locks in some common datastructures. Adding locks to a data structure to make it usable ... 阅读全文

posted @ 2015-11-03 06:51 Persistence 阅读(524) 评论(0) 推荐(0)

Quote comes from C. Joybell C.

摘要： The only way that we can live is if we grow; the only way we can grow is if we change;the only way we can change is if we learn; the only way we can l... 阅读全文

posted @ 2015-10-28 04:09 Persistence 阅读(158) 评论(0) 推荐(0)

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

摘要： ASIDE: Why System Calls Look Like Procedure Calls?You may wonder why a call to a system call, such as open() or read() looks exactly likea typical pro... 阅读全文

posted @ 2015-10-27 12:30 Persistence 阅读(244) 评论(0) 推荐(0)

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

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

posted @ 2015-10-26 12:02 Persistence 阅读(119) 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 would like to execute a series of instructio... 阅读全文

posted @ 2015-10-26 11:52 Persistence 阅读(161) 评论(0) 推荐(0)

Modern Operating System --- Multiple Processor Systems

摘要： Since its inception, the computer industry has been driven by an endless quest for moreand more computing power. The ENIAC could perform 300 operation... 阅读全文

posted @ 2015-10-20 12:32 Persistence 阅读(141) 评论(0) 推荐(0)

Modern Operating System --- Power Management (CPU)

摘要： The CPU can also be managed to save energy. A notebook CPU can be put to sleep in software, reducingpower usage to almost zero. The only thing it can ... 阅读全文

posted @ 2015-10-17 05:34 Persistence 阅读(207) 评论(0) 推荐(0)

Modern Operating System --- Power Management (Hard Disk)

摘要： Another major villain is the hard disk. It takes substantial energy to keep it spinning at highspeed, even if there are no accesses. Many conputers, e... 阅读全文

posted @ 2015-10-17 05:04 Persistence 阅读(163) 评论(0) 推荐(0)