Directory
Problem
SGI Version Space Configurator-std::alloc
First-level Space Configurator
Second-level Space Configurator
Refill, Chunkalloc functions
Finally, the Simple_alloc interface that the Configurator encapsulates
Problem
In our daily writing C + + programs, we often use our STL standar
Statement: Source code and "STL Source Analysis" (Houtie)Stl:C + + Standard Template Library, high versatility.Common data structures are encapsulated.Provides common general-purpose algorithms.STL six major components:Container algorithm iterator Faux function (function object) Adapter ConfiguratorThe role of the Space Configurator:1. Improve the code reuse rate, the function of modularization.2. Reduce memory fragmentation issues.For example, we lis
1. SGI Special Space Configurator, Std::alloc
SGI STL's configurator differs from the standard specification by its name alloc rather than allocator, and does not accept any parameters.
We are accustomed to the C + + memory configuration operation and release operations as follows:
Class Foo {...};
foo* pf = new Foo; Configure the memory, then construct the object
Delete pf;//Refactor the object and then f
When we were writing programs, we needed memory, and our first response was malloc, but it was so easy to make the inner slices unusable.The space adapter is mentioned in the STL, which is divided into two levels: the first-level space-appropriate configurator and the two-level space Configurator. The first-level space adapter is a simple wrapper over malloc, and its internal allocate () and reallocate () a
One, the Space Configurator standard interfaceSee "STL Source Code Anatomy" Chapter II-2.1.Ii. SGI Space Configurator with sub-configuration forceSGI STL's Configurator differs from the standard specification by its name alloc rather than allocator, and does not accept any parameters (although SGI also defines a configurator
The spatial configurator (allocator) Space Configurator, as I understand it, is a C + + STL memory management component (including memory application and release); Of course, not only memory, but also to the hard disk to request space; I mainly look at the configuration and release of memory ("Configuration" should be "application" meaning). STL's philosophy of this design mainly includes the following four
Space Configurator
From the implementation of the STL, the first thing to understand is the space Configurator, because the entire STL operation objects are placed in the container, and the container needs a certain allocation of space to place data. standard interface for Space Configurator
Standard interface, some typedef allocator::value_type;
Allocator::p oi
See more details: https://zcheng.ren/2016/08/16/STLAllocater/In the implementation of STL, the Space Configurator is the most important one, because the whole STL operation object is placed in the container, how to allocate space for the container so that the container can store the data. At this time we need to configure the Alloc for processing.What does the space Configurator alloc include?The Space
The following describes the memory space configurator implemented in STL.
Key points:
1) Considering the memory fragmentation problem caused by small blocks, a dual-layer Configurator is designed.
When the configuration block exceeds bytes, the first-level Configurator is called. The first-level configurator dire
To implement the SQL Server 2005 remote Connection database, we need to use the perimeter configurator that comes with the sql05, and here are some of the configuration descriptions:First we want to open the Sql05 perimeter configurator, for example:Once opened, we will now make the relevant configuration for it:Click on the "surface Area configuration for services and connections", such asNext is the optio
All STL operands (all values) are stored inside the container, and the container needs to allocate space to hold the data. Why not say allocator is a memory configurator but a space configurator, because space is not just memory, it can also be disk or other secondary storage media. Here we mainly discuss memory configuration.SGI STL The default space configurator
I. SGI standard space Configurator, Std::allocatorSGI also defines a configurator that complies with some of the criteria named allocator, but it does not use it itself, nor does it recommend that we use it, mainly because it is inefficient.It just puts the C + + operator:: operator new and:: operator delete as a simple wrapper.Second, SGI special Space Configurator
Sgistl default use of the two-level space Configurator, when the need to configure the chunk is greater than bytes when SGI STL calls the first-level space Configurator, the allocate function of the first-level space Configurator allocates memory directly using malloc, and the DEALLOCATE function frees memory directly using free. SGI STL calls a level two space
The recent use of Hibernate+proxool connection pool, always reported an exception:
Proxool Provider Unable to load JAXP configurator file:proxool.xml
Org.logicalcobwebs.proxool.ProxoolException:Parsing failed.
I searched the internet for more than n articles, always can not solve the problem. Finally put the following configuration in the Web.xml to delete, unexpectedly good, I do not know what the reason. Have a friend who knows why, please leave a
Configurator class Introduction and API Explanation 1.Configurator class introduction 1) To set the default delay of the script 2) function
A. Adjustable default time interval between two analog actionsB. Input time interval for adjustable input textC. Adjustable time interval for each scroll
2. Related APIs
Delay term
Default delay
Function description
Api
Memory configurator (allocator) and stlallocator of the STL Library
I am learning. If there are any mistakes, please give me more advice. According to our constant understanding, we will make changes. The changes will be retained. recording errors is the greatest improvement. Sorry!
SGI space configurator with sub-configuration force (SGI is a version of STL, and there are other versions)
Here, I will not p
Introduction
People often say, do not rebuild from the wheel, to stand on the shoulders of giants. In the face of these STL components that play the role of the wheel, is it necessary to delve into the design principles or implementation details? The answer varies from person to person. From an application perspective, you do not need to explore the implementation details (however, to a considerable extent, understand the underlying implementation of the practical use of the absolute help). Fro
I have read the source code of the STL space configurator and summarized it as follows:1. STL space configurator: It mainly consists of three file implementations. stl_construct.h defines the global functions construct () and destroy (), which are responsible for Object Construction and Analysis. The stl_alloc.h file defines level 1 and level 2 provisors. The provisioner name is alloc. stl_uninitialized.h d
This article explains the second level configurator of the SGI STL Space Configurator.
Compared with the first level configurator, the second level configurator has some more mechanisms to avoid fragmentation of memory in small chunks. Not only the problem of fragmentation, but also the additional burden of configurati
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