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322 lines
7.4 KiB
Lua
322 lines
7.4 KiB
Lua
-- This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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-- This file is based on Lua 5.x tests -- https://github.com/lua/lua/tree/master/testes
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print "testing coroutines"
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local f
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local main = coroutine.running()
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assert(main == nil)
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-- assert(not coroutine.resume(main))
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assert(coroutine.isyieldable()) -- note: we run this in context of a yieldable thread like all other Lua code
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--assert(not pcall(coroutine.yield))
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-- trivial errors
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assert(not pcall(coroutine.resume, 0))
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assert(not pcall(coroutine.status, 0))
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-- tests for multiple yield/resume arguments
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local function eqtab (t1, t2)
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assert(#t1 == #t2)
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for i = 1, #t1 do
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local v = t1[i]
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assert(t2[i] == v)
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end
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end
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_G.x = nil -- declare x
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function foo (a, ...)
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local x = coroutine.running()
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assert(x == f)
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-- next call should not corrupt coroutine (but must fail,
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-- as it attempts to resume the running coroutine)
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assert(coroutine.resume(f) == false)
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assert(coroutine.status(f) == "running")
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local arg = {...}
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assert(coroutine.isyieldable())
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for i=1,#arg do
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_G.x = {coroutine.yield(table.unpack(arg[i]))}
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end
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return table.unpack(a)
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end
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f = coroutine.create(foo)
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assert(type(f) == "thread" and coroutine.status(f) == "suspended")
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assert(string.find(tostring(f), "thread"))
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local s,a,b,c,d
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s,a,b,c,d = coroutine.resume(f, {1,2,3}, {}, {1}, {'a', 'b', 'c'})
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assert(s and a == nil and coroutine.status(f) == "suspended")
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s,a,b,c,d = coroutine.resume(f)
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eqtab(_G.x, {})
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assert(s and a == 1 and b == nil)
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s,a,b,c,d = coroutine.resume(f, 1, 2, 3)
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eqtab(_G.x, {1, 2, 3})
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assert(s and a == 'a' and b == 'b' and c == 'c' and d == nil)
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s,a,b,c,d = coroutine.resume(f, "xuxu")
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eqtab(_G.x, {"xuxu"})
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assert(s and a == 1 and b == 2 and c == 3 and d == nil)
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assert(coroutine.status(f) == "dead")
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s, a = coroutine.resume(f, "xuxu")
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assert(not s and string.find(a, "dead") and coroutine.status(f) == "dead")
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-- yields in tail calls
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local function foo (i) return coroutine.yield(i) end
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f = coroutine.wrap(function ()
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for i=1,10 do
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assert(foo(i) == _G.x)
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end
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return 'a'
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end)
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for i=1,10 do _G.x = i; assert(f(i) == i) end
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_G.x = 'xuxu'; assert(f('xuxu') == 'a')
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-- recursive
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function pf (n, i)
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coroutine.yield(n)
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pf(n*i, i+1)
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end
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f = coroutine.wrap(pf)
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local s=1
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for i=1,10 do
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assert(f(1, 1) == s)
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s = s*i
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end
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-- sieve
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function gen (n)
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return coroutine.wrap(function ()
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for i=2,n do coroutine.yield(i) end
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end)
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end
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function filter (p, g)
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return coroutine.wrap(function ()
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while 1 do
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local n = g()
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if n == nil then return end
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if math.fmod(n, p) ~= 0 then coroutine.yield(n) end
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end
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end)
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end
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local x = gen(80)
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local a = {}
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while 1 do
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local n = x()
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if n == nil then break end
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table.insert(a, n)
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x = filter(n, x)
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end
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assert(#a == 22 and a[#a] == 79)
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x, a = nil
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-- yielding across C boundaries
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co = coroutine.wrap(function()
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assert(not pcall(table.sort,{1,2,3}, coroutine.yield))
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assert(coroutine.isyieldable())
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coroutine.yield(20)
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return 30
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end)
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assert(co() == 20)
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assert(co() == 30)
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-- unyieldable C call
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do
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local function f (c)
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assert(not coroutine.isyieldable())
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return c .. c
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end
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local co = coroutine.wrap(function (c)
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assert(coroutine.isyieldable())
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local s = string.gsub("a", ".", f)
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return s
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end)
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assert(co() == "aa")
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end
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-- errors in coroutines
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function foo ()
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coroutine.yield(3)
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error(foo)
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end
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function goo() foo() end
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x = coroutine.wrap(goo)
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assert(x() == 3)
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local a,b = pcall(x)
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assert(not a and b == foo)
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x = coroutine.create(goo)
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a,b = coroutine.resume(x)
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assert(a and b == 3)
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a,b = coroutine.resume(x)
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assert(not a and b == foo and coroutine.status(x) == "dead")
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a,b = coroutine.resume(x)
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assert(not a and string.find(b, "dead") and coroutine.status(x) == "dead")
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-- co-routines x for loop
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function all (a, n, k)
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if k == 0 then coroutine.yield(a)
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else
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for i=1,n do
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a[k] = i
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all(a, n, k-1)
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end
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end
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end
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local a = 0
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for t in coroutine.wrap(function () all({}, 5, 4) end) do
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a = a+1
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end
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assert(a == 5^4)
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-- access to locals of collected corroutines
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local C = {}; setmetatable(C, {__mode = "kv"})
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local x = coroutine.wrap (function ()
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local a = 10
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local function f () a = a+10; return a end
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while true do
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a = a+1
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coroutine.yield(f)
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end
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end)
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C[1] = x;
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local f = x()
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assert(f() == 21 and x()() == 32 and x() == f)
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x = nil
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collectgarbage()
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assert(C[1] == undef)
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assert(f() == 43 and f() == 53)
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-- old bug: attempt to resume itself
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function co_func (current_co)
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assert(coroutine.running() == current_co)
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assert(coroutine.resume(current_co) == false)
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coroutine.yield(10, 20)
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assert(coroutine.resume(current_co) == false)
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coroutine.yield(23)
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return 10
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end
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local co = coroutine.create(co_func)
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local a,b,c = coroutine.resume(co, co)
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assert(a == true and b == 10 and c == 20)
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a,b = coroutine.resume(co, co)
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assert(a == true and b == 23)
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a,b = coroutine.resume(co, co)
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assert(a == true and b == 10)
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assert(coroutine.resume(co, co) == false)
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assert(coroutine.resume(co, co) == false)
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-- attempt to resume 'normal' coroutine
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local co1, co2
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co1 = coroutine.create(function () return co2() end)
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co2 = coroutine.wrap(function ()
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assert(coroutine.status(co1) == 'normal')
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assert(not coroutine.resume(co1))
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coroutine.yield(3)
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end)
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a,b = coroutine.resume(co1)
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assert(a and b == 3)
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assert(coroutine.status(co1) == 'dead')
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if not limitedstack then
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-- infinite recursion of coroutines
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a = function(a) coroutine.wrap(a)(a) end
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assert(not pcall(a, a))
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a = nil
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end
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-- access to locals of erroneous coroutines
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local x = coroutine.create (function ()
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local a = 10
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_G.f = function () a=a+1; return a end
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error('x')
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end)
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assert(not coroutine.resume(x))
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-- overwrite previous position of local `a'
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assert(not coroutine.resume(x, 1, 1, 1, 1, 1, 1, 1))
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assert(_G.f() == 11)
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assert(_G.f() == 12)
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-- leaving a pending coroutine open
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_X = coroutine.wrap(function ()
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local a = 10
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local x = function () a = a+1 end
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coroutine.yield()
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end)
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_X()
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if not limitedstack then
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-- bug (stack overflow)
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local j = 2^9
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local lim = 1000000 -- (C stack limit; assume 32-bit machine)
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local t = {lim - 10, lim - 5, lim - 1, lim, lim + 1}
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for i = 1, #t do
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local j = t[i]
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co = coroutine.create(function()
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local t = {}
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for i = 1, j do t[i] = i end
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return table.unpack(t)
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end)
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local r, msg = coroutine.resume(co)
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assert(not r)
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end
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co = nil
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end
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assert(coroutine.running() == main)
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-- bug in nCcalls
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local co = coroutine.wrap(function ()
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local a = {pcall(pcall,pcall,pcall,pcall,pcall,pcall,pcall,error,"hi")}
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return pcall(assert, table.unpack(a))
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end)
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local a = {co()}
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assert(a[10] == "hi")
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-- test coroutine with C functions
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local co = coroutine.create(coroutine.yield)
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assert(coroutine.status(co) == "suspended")
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coroutine.resume(co)
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assert(coroutine.status(co) == "suspended")
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coroutine.resume(co)
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assert(coroutine.status(co) == "dead")
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-- test correct handling of coroutine.yield returns for 0-30 values
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for i=0,30 do
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local T = table.create(i, 42)
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local co = coroutine.create(function() coroutine.yield(table.unpack(T)) end)
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local T2 = table.pack(coroutine.resume(co))
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assert(T2[1] == true)
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assert(1 + #T == #T2)
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assert(#T2 == 1 or T2[#T2] == 42)
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end
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return'OK'
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