This function creates a new Thread object.
| Parameter | Description |
|---|---|
| entrypoint | function the thread will execute when it begins |
| extra | extra value passed to the entrypoint function |
| start | if set to true the thread will begin execution immediately, otherwise it will begin in the ready state |
Returns a new thread object.
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--
-- This example calculates prime numbers first on a single thread, and then splits the
-- task up across multiple CPU cores. THe time is measured and displayed for each run.
--
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function CalcPrimeNumbers(start, size)
for num = start, start + size do
local count = 0
for i = 2, num / 2 do
if num % i == 0 then
count = count + 1
break
end
end
if count == 0 and num ~= 1 then
-- print(num)
end
end
end
local range = 200000
print("Single-threaded test:")
local starttime = os.clock()
CalcPrimeNumbers(1, range)
local elapsed = os.clock() - starttime
print(elapsed .. " milliseconds")
local threadcount = 4
print("Multi-threaded test (" .. threadcount .. " threads):")
local threads = {}
starttime = os.clock()
for n = 1, threadcount do
threads[n] = createThread(function()
CalcPrimeNumbers(range / threadcount * (n - 1), range / threadcount)
end, true)
end
for n = 1, threadcount do
threads[n]:wait()
end
elapsed = os.clock() - starttime
print(elapsed .. " milliseconds")