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---
name: VPP Comms Library (VCL)
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: "VCL simplifies app interaction with session layer by exposing
APIs that are similar to but not POSIX-compliant."
state: production
properties: [API, CLI, MULTITHREAD]
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