The Lua buffer module provides functions to deal with userdata as plain byte buffer. It optionally also provides functions to prevent concurrent execution in different threads. The main use case is to allow native module to return an interoperable buffer that could be manipulated at the script level then gave back to another native module. Another use case consists in sharing a buffer between two threads. The optional mutex allows the concurrent usage of a shared memory or shared resource. Features: - userdata buffer creation from size, string or userdata - string like functions: len, byte, sub - buffer manipulation functions: memcpy, memset, byteset - light userdata manipulation functions: lighten, toreference, fromreference - direct memory manipulation functions: malloc, free, realloc - mutual exclusion functions: lock, unlock and trylock Note: - The use of light userdata buffer is unsafe as the size is unknown and the pointer may have been freed. - The use of malloc, free, realloc is unsafe as there is no check against the pointer validity. - The buffer manipulation functions are unsafe as there is no control against the light userdata passed as argument. - A mutex must be initialized prior usage and destroy after. - Soft mutex is restricted to 2 threads. See the test.lua file to see the full usages. Lua buffer is covered by the MIT license.