zzdatura/threadpool_bars

Pretty progress bars for multi-threaded programs in C++.

Simple thread pool with progress bars in C++

This sample code showcases a simple canonical thread pool which can be tracked by progress bars shown in the terminal. Each thread can be associated with one progress bar, and an additional one accounts for all the tasks in the pool. A simple use case is when each task in the pool is long enough so it could benefit from user feedback while it's executing.

The 'jobs' in this sample are fake and don't do anything other than wait for a certain amount of time. Everything should finish running in about 40s.

It is assumed compilation with gcc, using c++20 (alias template deduction), and output should be fine as long as the terminal can draw the following nine characters in addition to ASCII:

│ ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
(vertical line and 8 block chars gradually filling from left to right)

Finally, the terminal should also support the ANSI escape sequences:

CSI n F        Cursor previous line
CSI ? 25 l     Hide cursor (DECTCEM), VT220
CSI ? 25 h     Show cursor (DECTCEM), VT220
CSI ? 12 l     Stop blinking cursor (AT&T 610)

While the last three sequences are not strictly necessary, they make the output much cleaner ;), though they could be easily disabled, if there is a problem, in ThreadPool::Bars::start().

Compiling the code with the provided makefile and makedepend.py will generate the binary bin/sample.