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parameters
* added support for an on_state_create callback called to load custom functions in a state in addition to the base libraries
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when atexit() handlers are processed
* Lua 5.2-style module:
* module() is no longer used to implement lanes.lua
* a global "lanes" variable is no longer created when the module is required
* the Lanes module table is returned instead
* Lanes must be initialized before used:
* the first occurence of 'require "lanes"' produces a minimal interface that only contains a configure() function
* the remainder of the interface is made available once this function is called
* subsequent calls to configure() do nothing
* configure() controls the number of keeper states and the startup of timers
* LuaJIT 2 compatibility
* non-Lua functions are no longer copied by creating a C closure from a C pointer, but through 2-way lookup tables
* this means that if a lane function body pulls non-Lua functions, the lane generator description must contain the list of libraries and modules that exports them
* introduces a change in configuration .globals management: contents are copied *after* std libs are loaded
* new .required configuration entry to list modules that must be require()'ed before lane body is transferred
* lane:cancel() wakes up waiting lindas like what is done at lane shutdown
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- Refactor lane proxy implementation: it is now a full userdata instead
of a table, and its methods are implemented in C instead of Lua.
* its metatable is no longer accessible.
* writing to the proxy raises an error.
* it is no longer possible to overwrite its join() and cancel() methods
- when a deep userdata idfunc requests a module to be required, manually
check that it is not loaded before requiring it instead of relying on
the require function's loop detection feature.
- when a module must be required, raise an error if the 'require' function
is not found in the target state.
- we know Lanes is loaded in the master state, so we don't force it
to be required in every lane too when a linda deep userdata is copied.
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