--- name: VPP Comms Library maintainer: Florin Coras <fcoras@cisco.com> features: - Abstracts vpp host stack sessions to integer session handles - Exposes its own async communication functions, i.e., epoll, select, poll - Supports multi-worker applications - Sessions cannot be shared between multiple threads/processes - VCL Locked Sessions (VLS): - Ensure through locking that only one thread accesses a session at a time - Detects and registers forked processes as new VCL workers. It does not register threads as new workers. - LD_PRELOAD shim (LDP): - Intercepts syscalls and injects them into VLS. - Applications that are supported work with VCL and implicitly with VPP's host stack without any code change - It does not support all syscalls and syscall options description: "VPP Comms Library (VCL) simplifies app interaction with session layer by exposing APIs that are similar to but not POSIX-compliant." state: production properties: [API, CLI, MULTITHREAD]