Enabling file system

File system in libuv is quite complicated.

• uses macros to INIT, PATH and POST to reduce repetitive codes.
• uses thread pool for async capability. uses uv__work_submit in POST to send to work thread
• thread pool uses mutex and signal

Threading

Linux uses pthread as uv_thread and pthread_mutex as uv_mutex, pthread_cond as uv_cond

Threadpool

Threadpool of worker

Worker

• add work calling uv__work_submit() with struct uv__work having work and done
• work is a function to execute in thread
• done is a function to be called after work is finished through calling uv_async_send()

async and io

• sync is used to handle work done
• inside async is io with uv__io_t structure for holding cb and watch fd
• worker calls uv_async_send which calls uv__async_send() to write one byte to wa->wfd to signal
• this is watched in uv__io_poll() with uv__epoll_pwait() and cb will be called which is done