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Required software: autoconf/automake/m4/perl/libtool (where libtool is not required). Autoconf is a shell scripting tool used to generate software source code packages that can be automatically configured to adapt to a variety of UNIX systems, of which autoconf needs to use M4 to facilitate script generation. Automake is a tool that automatically generates Makefile.in from Makefile.am files. Perl is also needed to generate Makefile.in,automake, and because the publication created by automake fully conforms to the GNU standard, there is no need for perl in creation. Libtool is a tool that facilitates the generation of various libraries.

Currently, automake supports three directory levels: flat, shallow, and deep.

1) flat means that all files are in the same directory.

That is, all source files, header files, and other library files are located in the current directory and have no subdirectories. Termutils is in this category.

2) shallow means that the main source code is stored in the top-level directory, and the other parts are stored in the subdirectory.

That is, the main source files are in the current directory, while some other source files that implement each part of the function are located in different directories. Automake itself is in this category.

3) deep means that all source code is stored in a subdirectory; the top-level directory mainly contains configuration information.

All source files and their own written header files are located in a subdirectory of the current directory, and there are no source files in the current directory. GNU cpio and GNU tar fall into this category.

The flat type is the simplest and the deep type is the most complex. It is not difficult to see that our simulation requirements are based on the third type of simulation, that is, we have to do challenging things:). Note: our test program is based on a simple multithreaded program.

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