Month: December 2015

mutex, semaphore,  monitor, condition variable are basic computer science concepts, but can easily get confused. some notes here. mutex:  thread has ownership, released by the one who acquired it.  no execution order…

How to fix “insmod invalid module format” for a out-of-tree linux device driver or kernel module? If your kernel source tree matched your run time kernel, it turns out that…

For some C++ features, it is much easier to understand using sample code virtual base class ( for multiple inheritance ) class A { public: A(int i); } class B: virtual…

C++ function overloading, name mangling, name hiding are somehow related to the same issue: overload resolution at compile time ( note override is run-time resolution). What is C++ Function overloading: two or…

It is quite easy to setup a ipv6 testbed at home now. (1) setup linux ipv6 router apt-get install radvd  # on a vm or real box debian and copy the…

maven basic On debian 8: apt-get install mvn  # this will install maven 3.0 mvn archetype:generate –DgroupId=com.mycompany.app –DartifactId=my–app –DarchetypeArtifactId=maven–archetype–quickstart –DinteractiveMode=false it basically  mkdir -p src/main/java/  ( put your java file here), create…

On Debian 8 (1) download and install JDK 8 from oracle (2) download and install Eclipse IDE for Jave EE (3) apt-get install  tomcat8 tomcat8-admin tomcat8-examples tomcat8-user mysql-server (4) git clone https://github.com/mingewang/HibernateDataSource…