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--
-- BASIC.LUA Copyright (c) 2007-08, Asko Kauppi <akauppi@gmail.com>
--
-- Selftests for Lua Lanes
--
-- To do:
-- - ...
--
require "lanes"
require "assert" -- assert.fails()
local lanes_gen= assert( lanes.gen )
local lanes_linda= assert( lanes.linda )
local tostring= assert( tostring )
local function PRINT(...)
local str=""
for i=1,select('#',...) do
str= str..tostring(select(i,...)).."\t"
end
if io then
io.stderr:write(str.."\n")
end
end
---=== Local helpers ===---
local tables_match
-- true if 'a' is a subtable of 'b'
--
local function subtable( a, b )
--
assert( type(a)=="table" and type(b)=="table" )
for k,v in pairs(b) do
if type(v)~=type(a[k]) then
return false -- not subtable (different types, or missing key)
elseif type(v)=="table" then
if not tables_match(v,a[k]) then return false end
else
if a[k] ~= v then return false end
end
end
return true -- is a subtable
end
-- true when contents of 'a' and 'b' are identific
--
tables_match= function( a, b )
return subtable( a, b ) and subtable( b, a )
end
PRINT( "---=== Tasking (basic) ===---")
local function task( a, b, c )
--error "111" -- testing error messages
assert(hey)
local v=0
for i=a,b,c do
v= v+i
end
return v, hey
end
local task_launch= lanes_gen( "", { globals={hey=true} }, task )
-- base stdlibs, normal priority
-- 'task_launch' is a factory of multithreaded tasks, we can launch several:
local lane1= task_launch( 100,200,3 )
local lane2= task_launch( 200,300,4 )
-- At this stage, states may be "pending", "running" or "done"
local st1,st2= lane1.status, lane2.status
PRINT(st1,st2)
assert( st1=="pending" or st1=="running" or st1=="done" )
assert( st2=="pending" or st2=="running" or st2=="done" )
-- Accessing results ([1..N]) pends until they are available
--
PRINT("waiting...")
local v1, v1_hey= lane1[1], lane1[2]
local v2, v2_hey= lane2[1], lane2[2]
PRINT( v1, v1_hey )
assert( v1_hey == true )
PRINT( v2, v2_hey )
assert( v2_hey == true )
assert( lane1.status == "done" )
assert( lane1.status == "done" )
PRINT( "---=== Tasking (cancelling) ===---")
local task_launch2= lanes_gen( "", { cancelstep=100, globals={hey=true} }, task )
local N=999999999
local lane9= task_launch2(1,N,1) -- huuuuuuge...
-- Wait until state changes "pending"->"running"
--
local st
local t0= os.time()
while os.time()-t0 < 5 do
st= lane9.status
io.stderr:write( (i==1) and st.." " or '.' )
if st~="pending" then break end
end
PRINT(" "..st)
if st=="error" then
local _= lane9[0] -- propagate the error here
end
if st=="done" then
error( "Looping to "..N.." was not long enough (cannot test cancellation)" )
end
assert( st=="running" )
lane9:cancel()
local t0= os.time()
while os.time()-t0 < 5 do
st= lane9.status
io.stderr:write( (i==1) and st.." " or '.' )
if st~="running" then break end
end
PRINT(" "..st)
assert( st == "cancelled" )
PRINT( "---=== Communications ===---")
local function WR(...) io.stderr:write(...) end
local chunk= function( linda )
local function receive() return linda:receive( "->" ) end
local function send(...) linda:send( "<-", ... ) end
WR( "Lane starts!\n" )
local v
v=receive(); WR( v.." received\n" ); assert( v==1 )
v=receive(); WR( v.." received\n" ); assert( v==2 )
v=receive(); WR( v.." received\n" ); assert( v==3 )
send( 1,2,3 ); WR( "1,2,3 sent\n" )
send 'a'; WR( "'a' sent\n" )
send { 'a', 'b', 'c', d=10 }; WR( "{'a','b','c',d=10} sent\n" )
v=receive(); WR( v.." received\n" ); assert( v==4 )
WR( "Lane ends!\n" )
end
local linda= lanes_linda()
assert( type(linda) == "userdata" )
--
-- ["->"] master -> slave
-- ["<-"] slave <- master
local function PEEK() return linda:get("<-") end
local function SEND(...) linda:send( "->", ... ) end
local function RECEIVE() return linda:receive( "<-" ) end
local t= lanes_gen("io",chunk)(linda) -- prepare & launch
SEND(1); WR( "1 sent\n" )
SEND(2); WR( "2 sent\n" )
for i=1,100 do
WR "."
assert( PEEK() == nil ) -- nothing coming in, yet
end
SEND(3); WR( "3 sent\n" )
local a,b,c= RECEIVE(), RECEIVE(), RECEIVE()
WR( a..", "..b..", "..c.." received\n" )
assert( a==1 and b==2 and c==3 )
local a= RECEIVE(); WR( a.." received\n" )
assert( a=='a' )
local a= RECEIVE(); WR( type(a).." received\n" )
assert( tables_match( a, {'a','b','c',d=10} ) )
assert( PEEK() == nil )
SEND(4)
PRINT( "---=== Stdlib naming ===---")
local function io_os_f()
assert(io)
assert(os)
assert(print)
return true
end
local f1= lanes_gen( "io,os", io_os_f ) -- any delimiter will do
local f2= lanes_gen( "io+os", io_os_f )
local f3= lanes_gen( "io,os,base", io_os_f )
assert.fails( function() lanes_gen( "xxx", io_os_f ) end )
assert( f1()[1] )
assert( f2()[1] )
assert( f3()[1] )
PRINT( "---=== Comms criss cross ===---")
-- We make two identical lanes, which are using the same Linda channel.
--
local tc= lanes_gen( "io",
function( linda, ch_in, ch_out )
local function STAGE(str)
io.stderr:write( ch_in..": "..str.."\n" )
linda:send( nil, ch_out, str )
local v= linda:receive( nil, ch_in )
assert(v==str)
end
STAGE("Hello")
STAGE("I was here first!")
STAGE("So what?")
end
)
local linda= lanes_linda()
local a,b= tc(linda, "A","B"), tc(linda, "B","A") -- launching two lanes, twisted comms
local _= a[1],b[1] -- waits until they are both ready
PRINT( "---=== Receive & send of code ===---")
local upvalue="123"
local function chunk2( linda )
assert( upvalue=="123" ) -- even when running as separate thread
-- function name & line number should be there even as separate thread
--
local info= debug.getinfo(1) -- 1 = us
--
for k,v in pairs(info) do PRINT(k,v) end
assert( info.nups == 2 ) -- one upvalue + PRINT
assert( info.what == "Lua" )
--assert( info.name == "chunk2" ) -- name does not seem to come through
assert( string.match( info.source, "^@.*basic.lua$" ) )
assert( string.match( info.short_src, "^.*basic.lua$" ) )
-- These vary so let's not be picky (they're there..)
--
assert( info.linedefined > 200 ) -- start of 'chunk2'
assert( info.currentline > info.linedefined ) -- line of 'debug.getinfo'
assert( info.lastlinedefined > info.currentline ) -- end of 'chunk2'
local func,k= linda:receive( "down" )
assert( type(func)=="function" )
assert( k=="down" )
func(linda)
local str= linda:receive( "down" )
assert( str=="ok" )
linda:send( "up", function() return ":)" end, "ok2" )
end
local linda= lanes.linda()
local t2= lanes_gen( "debug,string,io", chunk2 )(linda) -- prepare & launch
linda:send( "down", function(linda) linda:send( "up", "ready!" ) end,
"ok" )
-- wait to see if the tiny function gets executed
--
local s= linda:receive( "up" )
PRINT(s)
assert( s=="ready!" )
-- returns of the 'chunk2' itself
--
local f= linda:receive( "up" )
assert( type(f)=="function" )
local s2= f()
assert( s2==":)" )
local ok2= linda:receive( "up" )
assert( ok2 == "ok2" )
PRINT( "---=== :join test ===---")
-- NOTE: 'unpack()' cannot be used on the lane handle; it will always return nil
-- (unless [1..n] has been read earlier, in which case it would seemingly
-- work).
local S= lanes_gen( "table",
function(arg)
aux= {}
for i, v in ipairs(arg) do
table.insert (aux, 1, v)
end
return unpack(aux)
end )
h= S { 12, 13, 14 } -- execution starts, h[1..3] will get the return values
local a,b,c,d= h:join()
assert(a==14)
assert(b==13)
assert(c==12)
assert(d==nil)
--
io.stderr:write "Done! :)\n"
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