shared

Any concept of shared memory in Java

由 隐身守侯 提交于 2019-11-27 01:27:00
AFAIK, memory in Java is based on heap from which the memory is allotted to objects dynamically and there is no concept of shared memory. If there is no concept of shared memory, then the communication between Java programs should be time consuming. In C where inter-process communication is quicker via shared memory compared to other modes of communication. Correct me if I'm wrong. Also what is the quickest way for 2 Java progs to talk to each other. Since there is no official API to create a shared memory segment, you need to resort to a helper library/DDL and JNI to use shared memory to have

Is there a Windows/MSVC equivalent to the -rpath linker flag?

由 会有一股神秘感。 提交于 2019-11-27 00:34:49
问题 On Linux/GCC I can use the -rpath flag to change an executables search path for shared libraries without tempering with environment variables. Can this also be accomplished on Windows? As far as I know, dlls are always searched in the executable's directory and in PATH. My scenario: I would like to put shared libraries into locations according to their properties (32/64bit/Debug/Release) without taking care of unique names. On Linux, this is easily be done via rpath, but I haven't found any

Sharing a variable between multiple different threads

由 Deadly 提交于 2019-11-26 23:03:14
问题 I want to share a variable between multiple threads like this: boolean flag = true; T1 main = new T1(); T2 help = new T2(); main.start(); help.start(); I'd like to share flag between main and help thread where these are two different Java classes I've created. Is any way to do this? Thanks! 回答1: Both T1 and T2 can refer to a class containing this variable. You can then make this variable volatile , and this means that Changes to that variable are immediately visible in both threads. See this

Vista and ProgramData

由 和自甴很熟 提交于 2019-11-26 21:46:45
问题 What is the right place to store program data files which are the same for every user but have to be writeable for the program? What would be the equivalent location on MS Windows XP? I have read that C:\ProgramData is not writeable after installation by normal users. Is that true? How can I retrieve that directory programmatically using the Platform SDK? 回答1: SHGetFolderPath() with CSIDL of CSIDL_COMMON_APPDATA. Read more at http://msdn.microsoft.com/en-us/library/bb762181(VS.85).aspx If you

How to start Solr automatically?

由 筅森魡賤 提交于 2019-11-26 21:24:00
At the moment I have to go to /usr/java/apache-solr-1.4.0/example and then do: java -jar start.jar How do I get this to start automatically on boot? I'm on a shared Linux server. If you have root access to your machine, there are a number of ways to do this based on your system's initialization flow (init scripts, systemd, etc.) But if you don't have root, cron has a clean and consistent way to execute programs upon reboot. First, find out where java is located on your machine. The command below will tell you where it is: $ which java Then, stick the following code into a shell script,

How to share keychain data between iOS applications

由 你离开我真会死。 提交于 2019-11-26 15:08:00
I am describing a problem for which it took me quite some time to learn the answer. The " GenericKeychain " example is a good start at providing a wrapper for sharing keychain data between applications when using the accessGroup in the init. However, implementing this in my app yielded an obscure error code (which took forever to locate) -25243, which means: No access control. I ran Apple's example app (GenericKeychain) on my iPad only to get the same error. Huh? Does Apple's documentation fail to deliver on what is necessary to accomplish this? After some (a lot of) digging throughout the web

Best way for interprocess communication in C++

由 跟風遠走 提交于 2019-11-26 13:05:44
问题 I have two processes one will query other for data.There will be huge amount of queries in a limited time (10000 per second) and data (>100 mb) will be transferred per second.Type of data will be an integral type(double,int) My question is in which way to connect this process? Shared memory , message queue , lpc(Local Procedure call) or others.... And also i want to ask which library you suggest? by the way please do not suggest MPI. edit : under windows xp 32 bit 回答1: One Word: Boost

How to configure an existing git repo to be shared by a UNIX group

由 ╄→гoц情女王★ 提交于 2019-11-26 09:14:59
问题 I have an existing git repo (a bare one) which has up to this point only been writable by me. I want to open it up to some UNIX user group, foo, so that all members of foo can push to it. I\'m aware that I can easily set up a new git repo with: git init --bare --shared=group repodir chgrp -R foo repodir But I need the equivalent operation for an existing repo dir. 回答1: Try this to make an existing repository in repodir work for users in group foo : chgrp -R foo repodir # set the group chmod

Is it possible to get CMake to build both a static and shared version of the same library?

由 血红的双手。 提交于 2019-11-26 07:57:28
问题 Same source, all that, just want a static and shared version both. Easy to do? 回答1: Yes, it's moderately easy. Just use two "add_library" commands: add_library(MyLib SHARED source1.c source2.c) add_library(MyLibStatic STATIC source1.c source2.c) Even if you have many source files, you would place the list of sources in a cmake variable, so it's still easy to do. On Windows you should probably give each library a different name, since there is a ".lib" file for both shared and static. But on

How to start Solr automatically?

由 江枫思渺然 提交于 2019-11-26 07:55:50
问题 At the moment I have to go to /usr/java/apache-solr-1.4.0/example and then do: java -jar start.jar How do I get this to start automatically on boot? I\'m on a shared Linux server. 回答1: If you have root access to your machine, there are a number of ways to do this based on your system's initialization flow (init scripts, systemd, etc.) But if you don't have root, cron has a clean and consistent way to execute programs upon reboot. First, find out where java is located on your machine. The
订阅 shared