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+-- Copyright (c) 2011 by Ross Anderson <ross_j_anderson@yahoo.com>
+--
+-- Permission is hereby granted, free of charge, to any person obtaining a copy
+-- of this software and associated documentation files (the "Software"), to deal
+-- in the Software without restriction, including without limitation the rights
+-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+-- copies of the Software, and to permit persons to whom the Software is
+-- furnished to do so, subject to the following conditions:
+--
+-- The above copyright notice and this permission notice shall be included in
+-- all copies or substantial portions of the Software.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+-- THE SOFTWARE.
+
+-- Sub-thread processing example in Lua using llthreads - 1,000 quick sub-thread execution
+
+-- luajit sub_threads.lua
+
+local llthreads = require"llthreads"
+
+local num_threads = tonumber(arg[1] or 1000)
+ 
+-- level 0 string literal enclosure [[  ]] of child execution code
+local thread_code = [[  
+    local lua_init = os.getenv("lua_init")
+    if lua_init and #lua_init > 0 then
+        if lua_init:sub(1,1) == '@' then
+            dofile(lua_init:sub(2))
+        else
+            assert((loadstring or load)(lua_init))()
+        end
+    end
+
+    local num_threads = ...
+    print("CHILD: received from ROOT params:", ...)    
+    local llthreads = require"llthreads" -- need to re-declare this under this scope
+    local t = {} -- thread storage table
+
+    -- create a new child sub-thread execution code - it requires level 1 literal string [=[ ]=] enclosures, level 2 would be [==[ ]==]
+    local executed_child_code = [=[ 
+        return "Hello from child sub-thread, new input params:", ... 
+    ]=]
+
+    -- create 1000 sub-threads - which creates an incremental 30% / 20% utilization spike on the two AMD cpu cores
+    print("CHILD: Create sub threads:", num_threads)
+    for i=1,num_threads do
+        -- create child sub-thread with code to execute and the input parmeters
+        local thread = llthreads.new(executed_child_code , "number:", 1000 + i, "nil:", nil, "bool:", true) 
+        assert(thread:start()) -- start new child sub-thread
+        table.insert(t, thread) -- append the thread at the end of the thread table
+    end
+
+    -- wait (block) for all child sub-threads to complete before returning to ROOT
+    while true do
+        -- always wait on the first element, since order is not important        
+        print("CHILD: sub-thread returned: ", t[1]:join()) 
+        table.remove(t,1) -- always remove the first element
+        if (#t == 0) then break end
+    end
+    return ...  -- return the parents' input params back to the root
+]]
+
+-- create child thread.
+local thread = llthreads.new(thread_code, num_threads, "number:", 1000, "nil:", nil, "bool:", true)
+-- start joinable child thread.
+assert(thread:start())
+-- wait for all child and child sub-threads to finish
+print("ROOT: child returned: ", thread:join())