23687255263

Committed 28 Mar 2026 02:28PM UTC coverage: 97.029% (-0.01%) from 97.043%

Build # 23687255263

Build Type

push

github

Committed by

web-flow

Commit Message

Merge d1d80dc7c into eea104d82

Coverage Stats

5 of 6 new or added lines in 1 file covered. (83.33%)

5 existing lines in 3 files now uncovered.

6304 of 6497 relevant lines covered (97.03%)

19847.45 hits per line

Source File
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81.36

/src/luacheck/multithreading.lua

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 lanes_major = tonumber(lanes.ABOUT.version:match("^(%d+)"))
-- Manage both new and old lane:join() API formats.
-- See https://github.com/LuaLanes/lanes/commit/bfdc7a92c4e3e99522abb6d90ef2cbb021f36fc8
local worker_join_compat
if  lanes_major >= 4 then
   -- New API: {true, _, ok, worker_results}
   worker_join_compat = function(worker) return worker:join() end
else
   -- Old API: {true, ok, worker_results}
   worker_join_compat = function(worker)
      local err, ok, worker_results = worker:join()
      return true, err, ok, worker_results
   end
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 _, __, ok, worker_results = worker_join_compat(worker)

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

   return results
end

return multithreading

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

lunarmodules / luacheck / 23687255263

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