|
|
对于latch保护链表这个说法，表示有些看法，准确的应该是共享的数据结构。
What is a latch?
Latches are low level serialization mechanisms used to protect shared data structures in the SGA. The implementation of latches is operating system dependent, particularly in regard to whether a process will wait for a latch and for how long.
A latch is a type of a lock that can be very quickly acquired and freed. Latches are typically used to prevent more than one process from executing the same piece of code at a given time. Associated with each latch is a cleanup procedure that will be called if a process dies while holding the latch.
Latches have an associated level that is used to prevent deadlocks. Once a process acquires a latch at a certain level it cannot subsequently acquire a latch at a level that is equal to or less than that level (unless it acquires it nowait).
引用FAQ: What are Latches and What Causes Latch Contention [ID 22908.1] |
|
楼主: Kevin__Zhang
IP卡
狗仔卡
发表于 2011-11-22 09:40
显身卡
发表于 2011-12-20 12:46
