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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]