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* new: API lanes.require(), use it instead of regular require() for modules that export C functions you need to send over.
* new: lanes no longer require 'lanes.core' by default in every created state. Use {required={"lanes.core"}} if you need to transfer lanes functions.
* internal: because of the above, reworked the timer implementation to remove upvalue-dependency on lanes.core
* new: API lanes.timer_lane, to be able to operate on timer lane if need be
* improved: if a module is a full userdata, scan its metatable for function database population
* improved: on_state_create can be a Lua function
* changed: on_state_create is called after the base libraries are loaded
* package[loaders|searchers] is no longer transfered as function naming depends on slot order
* internal: changed separator from '.' to '/' in lookup databases to be able to distinguish search levels and dot coming from module names
* added some mode debug spew
* updated tests to reflect the above changes
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* lane.status can return "killed" if lane was forcefully killed with lanes:cancel()
* lane:join(): return nil, "killed" if called on a killed lane.
* lane[<n>]: produces [1] = nil, [2] = "killed" if the lane was killed
* lane:join(): fixed an assertion in debug builds when joining a lane forcefully cancelled with lane:cancel( <x>, true).
* indexing a lane with a string other than "join", "cancel" or "status" raises an error.
* fixed configure() to correctly apply defaults when they are missing from the provided settings
* added a shutdown_timeout to control the duration Lanes will wait for graceful termination of running lanes at application shutdown. Default is 0.25.
Among other things, fixes issue #31.
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merge commits from steve
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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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