21044623957

Committed 15 Jan 2026 08:02PM UTC coverage: 97.014% (-0.03%) from 97.042%

Build # 21044623957

Build Type

push

github

Committed by

web-flow

Commit Message

Merge da3776733 into 6fc4af915

Run Details

5 of 7 new or added lines in 1 file covered. (71.43%)

5 existing lines in 4 files now uncovered.

6303 of 6497 relevant lines covered (97.01%)

19269.74 hits per line

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80.0

/src/luacheck/multithreading.lua

-- luacheck: push compat
local unpack = table.unpack or unpack
-- luacheck: pop

local utils = require "luacheck.utils"

local multithreading = {}

local lanes_ok, lanes = pcall(require, "lanes")
lanes_ok = lanes_ok and pcall(lanes.configure)
multithreading.has_lanes = lanes_ok
multithreading.lanes = lanes
multithreading.default_jobs = 1

if not lanes_ok then
   return multithreading
end

local cpu_number_detection_commands = {}

if utils.is_windows then
   cpu_number_detection_commands[1] = "echo %NUMBER_OF_PROCESSORS%"
else
   cpu_number_detection_commands[1] = "getconf _NPROCESSORS_ONLN 2>&1"
   cpu_number_detection_commands[2] = "sysctl -n hw.ncpu 2>&1"
   cpu_number_detection_commands[3] = "psrinfo -p 2>&1"
end

for _, command in ipairs(cpu_number_detection_commands) do
   local handler = io.popen(command)

   if handler then
      local output = handler:read("*a")
      handler:close()

      if output then
         local cpu_number = tonumber(utils.strip(output))

         if cpu_number then
            multithreading.default_jobs = math.floor(math.max(cpu_number, 1))
            break
         end
      end
   end
end

-- Reads pairs {key, arg} from given linda slot until it gets nil as arg.
-- Returns table with pairs [key] = func(arg).
local function worker_task(linda, input_slot, func)
   local results = {}

   while true do
      local _, pair = linda:receive(nil, input_slot)
      local key, arg = pair[1], pair[2]

      if arg == nil then
         return results
      end

      results[key] = func(arg)
   end
end

local function protected_worker_task(...)
   return true, utils.try(worker_task, ...)
end

local worker_gen = lanes.gen("*", protected_worker_task)

-- Maps func over array, performing at most jobs calls in parallel.
function multithreading.pmap(func, array, jobs)
   jobs = jobs or multithreading.default_jobs
   jobs = math.min(jobs, #array)

   if jobs < 2 then
      return utils.map(func, array)
   end

   local workers = {}
   local linda = lanes.linda()

   for i = 1, jobs do
      workers[i] = worker_gen(linda, 0, func)
   end

   for i, item in ipairs(array) do
      linda:send(nil, 0, {i, item})
   end

   for _ = 1, jobs do
      linda:send(nil, 0, {})
   end

   local results = {}

   for _, worker in ipairs(workers) do
      local join_results = {worker:join()}

      -- Manage both new and old lane:join() API formats.
      -- See https://github.com/LuaLanes/lanes/commit/bfdc7a92c4e3e99522abb6d90ef2cbb021f36fc8
      local ok, worker_results, _
      if #join_results == 4 then
         -- New API: {true, _, ok, worker_results}
         _, _, ok, worker_results = unpack(join_results)
      elseif #join_results == 3 then
         -- Old API: {true, ok, worker_results}
         _, ok, worker_results = unpack(join_results)
      else
         error("Unexpected lane:join() return format", 0)
      end

      if ok then
         utils.update(results, worker_results)
      else
         error(worker_results, 0)
      end
   end

   return results
end

return multithreading

1	-- luacheck: push compat
2	local unpack = table.unpack or unpack	512✔
3	-- luacheck: pop
4
5	local utils = require "luacheck.utils"	512✔
6
7	local multithreading = {}	512✔
8
9	local lanes_ok, lanes = pcall(require, "lanes")	512✔
10	lanes_ok = lanes_ok and pcall(lanes.configure)	512✔
11	multithreading.has_lanes = lanes_ok	512✔
12	multithreading.lanes = lanes	512✔
13	multithreading.default_jobs = 1	512✔
14
15	if not lanes_ok then	512✔
16	return multithreading	×
17	end
18
19	local cpu_number_detection_commands = {}	512✔
20
21	if utils.is_windows then	512✔
22	cpu_number_detection_commands[1] = "echo %NUMBER_OF_PROCESSORS%"	×
23	else
24	cpu_number_detection_commands[1] = "getconf _NPROCESSORS_ONLN 2>&1"	512✔
25	cpu_number_detection_commands[2] = "sysctl -n hw.ncpu 2>&1"	512✔
26	cpu_number_detection_commands[3] = "psrinfo -p 2>&1"	512✔
27	end
28
29	for _, command in ipairs(cpu_number_detection_commands) do	512✔
30	local handler = io.popen(command)	512✔
31
32	if handler then	512✔
33	local output = handler:read("*a")	512✔
34	handler:close()	512✔
35
36	if output then	512✔
37	local cpu_number = tonumber(utils.strip(output))	512✔
38
39	if cpu_number then	512✔
40	multithreading.default_jobs = math.floor(math.max(cpu_number, 1))	512✔
41	break	256✔
42	end
43	end
44	end
45	end
46
47	-- Reads pairs {key, arg} from given linda slot until it gets nil as arg.
48	-- Returns table with pairs [key] = func(arg).
49	local function worker_task(linda, input_slot, func)
50	local results = {}	×
51
52	while true do
53	local _, pair = linda:receive(nil, input_slot)	×
54	local key, arg = pair[1], pair[2]	×
55
56	if arg == nil then	×
57	return results	×
58	end
59
60	results[key] = func(arg)	×
61	end
62	end
63
64	local function protected_worker_task(...)
65	return true, utils.try(worker_task, ...)	×
66	end
67
68	local worker_gen = lanes.gen("*", protected_worker_task)	512✔
69
70	-- Maps func over array, performing at most jobs calls in parallel.
71	function multithreading.pmap(func, array, jobs)	512✔
72	jobs = jobs or multithreading.default_jobs	468✔
73	jobs = math.min(jobs, #array)	468✔
74
75	if jobs < 2 then	468✔
76	return utils.map(func, array)	312✔
77	end
78
79	local workers = {}	156✔
80	local linda = lanes.linda()	156✔
81
82	for i = 1, jobs do	544✔
83	workers[i] = worker_gen(linda, 0, func)	388✔
84	end
85
86	for i, item in ipairs(array) do	860✔
87	linda:send(nil, 0, {i, item})	704✔
88	end
89
90	for _ = 1, jobs do	544✔
91	linda:send(nil, 0, {})	388✔
92	end
93
94	local results = {}	156✔
95
96	for _, worker in ipairs(workers) do	544✔
97	local join_results = {worker:join()}	388✔
98
99	-- Manage both new and old lane:join() API formats.
100	-- See https://github.com/LuaLanes/lanes/commit/bfdc7a92c4e3e99522abb6d90ef2cbb021f36fc8
101	local ok, worker_results, _
102	if #join_results == 4 then	388✔
103	-- New API: {true, _, ok, worker_results}
NEW 104	_, _, ok, worker_results = unpack(join_results)	×
105	elseif #join_results == 3 then	388✔
106	-- Old API: {true, ok, worker_results}
107	_, ok, worker_results = unpack(join_results)	388✔
108	else
NEW 109	error("Unexpected lane:join() return format", 0)	×
110	end
111
112	if ok then	388✔
113	utils.update(results, worker_results)	388✔
114	else
115	error(worker_results, 0)	×
116	end
117	end
118
119	return results	156✔
120	end
121
122	return multithreading	512✔

lunarmodules / luacheck / 21044623957

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