类似Oracle cbc闩锁的是一种Kingbase的轻量级锁lwlock,这个锁的名字在不同数据库版本中可能有所不同,我们统一称之为buffer_mapping(BufMappingLock),这个轻量级锁用于HASH BUCKET的串行化访问。因为在每个buffer 访问中都需要使用这个锁,因此和Oracle一样,Kingbase采用了分区锁的方式,将整个HASH TABLE分为多个分区(缺省位...
在KingbaseES数据库中,会话在将数据块与共享缓冲池的缓冲区相关联时,会触发“LWLock buffer_mapping”等待事件。 这类事件涉及到一种轻量级锁(lwlock),类似于Oracle中的闩锁。这个锁在不同的数据库中可能有不同的名称,但通常被称为buffer_mapping或BufMappingLock。它主要用于实现对HASH BUCKET的有序访问。在Kingbase...
TheLWLock:buffer_mappingwait event occurs in the following scenarios: A process searches the buffer table for a page and acquires a shared buffer mapping lock. A process loads a page into the buffer pool and acquires an exclusive buffer mapping lock. ...
popup_bnr = vim.api.nvim_create_buf(false, true) assert(popup_bnr, "Failed to create buffer") vim.api.nvim_buf_set_lines(popup_bnr, 0, -1, true, {'simple', 'floater'}) vim.api.nvim_set_option_value("bufhidden", "wipe", {buf = popup_bnr}) vim.api.nvim_set_option_value...
0 (0) STRUCTURE 0 BFPDSECT START OF BUFFER PREFIX 0 (0) CHARACTER 4 BFPID BUFFER INDENTIFIER 4 (4) SIGNED 4 BFPBAT ADDRESS OF AUXILIARY BUFFER 4 (4) X'4' 0 BFPSWEL "BFPBAT,,C'A'" Address of SWEL (TP buffers in process of signon only) 8 (8) ADDRESS 4 BUFCHAIN BUFFER CHAIN...
BUFFER MAPPING SCHEME INVOLVING PRE-ALLOCATION OF MEMORYThe inventive concept pertains to a computer-implemented method by which an application, an operating system, and hardware communicate with one another. The method entails the application converting an application-level virtual address to a physical...
+ lockdep_assert_held(&cpu_buffer->mapping_lock); + + subbuf_order = cpu_buffer->buffer->subbuf_order; + subbuf_pages = 1 << subbuf_order; + + nr_subbufs = cpu_buffer->nr_pages + 1; /* + reader-subbuf */ + nr_pages = ((nr_subbufs) << subbuf_order) - pgoff + 1...
+When a mapping is in place on a Tracefs ring-buffer, it is not possible to +either resize it (either by increasing the entire size of the ring-buffer or +each subbuf). It is also not possible to use snapshot and causes splice to copy ...
IVsTextBufferCoordinator.SetBufferMappingModes(UInt32, UInt32) Method Reference Feedback Definition Namespace: Microsoft.VisualStudio.TextManager.Interop Assembly: Microsoft.VisualStudio.Interop.dll Package: Microsoft.VisualStudio.Interop v17.9.37000 Establishes the mapping m...
publicenum_BufferCoordinatorMappingMode 成员 展开表 成员名称说明 BCMM_ENTIREBUFFER指示缓冲区是一个范围,因此,不需要标记。这是特定模式;如果您创建一个标记跟踪整个缓冲区,标记将被删除,当用户删除整个缓冲区的内容,,后面的标记操作丢失。无法创建大于缓冲区宽的标记。此模式取代设置的任何其他位标志。