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<title>src/System/Posix/Graceful/Worker.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ExistentialQuantification #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : System.Posix.Graceful.Worker</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : 2013 Noriyuki OHKAWA</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD3</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : n.ohkawa@gmail.com</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : unknown</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Worker process</span>
<a name="line-12"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Graceful</span><span class='hs-varop'>.</span><span class='hs-conid'>Worker</span>
<a name="line-13"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>GracefulWorker</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>workerProcess</span>
<a name="line-15"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span> <span class='hs-layout'>(</span> <span class='hs-varid'>forkIO</span><span class='hs-layout'>,</span> <span class='hs-varid'>threadDelay</span> <span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span><span class='hs-varop'>.</span><span class='hs-conid'>STM</span> <span class='hs-layout'>(</span> <span class='hs-varid'>atomically</span><span class='hs-layout'>,</span> <span class='hs-varid'>newTVarIO</span><span class='hs-layout'>,</span> <span class='hs-varid'>modifyTVar'</span><span class='hs-layout'>,</span> <span class='hs-varid'>readTVar</span> <span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span> <span class='hs-conid'>IOException</span><span class='hs-layout'>,</span> <span class='hs-varid'>bracket</span><span class='hs-layout'>,</span> <span class='hs-varid'>bracket_</span><span class='hs-layout'>,</span> <span class='hs-varid'>finally</span><span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span> <span class='hs-varid'>void</span><span class='hs-layout'>,</span> <span class='hs-varid'>forever</span><span class='hs-layout'>,</span> <span class='hs-varid'>when</span> <span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Socket</span> <span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-conid'>Wrapper</span> <span class='hs-layout'>(</span> <span class='hs-varid'>close</span><span class='hs-layout'>,</span> <span class='hs-varid'>accept</span> <span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Exit</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ExitCode</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Process</span> <span class='hs-layout'>(</span> <span class='hs-varid'>exitImmediately</span> <span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Signals</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Handler</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>installHandler</span><span class='hs-layout'>,</span> <span class='hs-varid'>sigQUIT</span> <span class='hs-layout'>)</span>
<a name="line-26"></a>
<a name="line-27"></a><a name="GracefulWorker"></a><span class='hs-comment'>-- | Worker process settings</span>
<a name="line-28"></a><a name="GracefulWorker"></a><span class='hs-comment'>--</span>
<a name="line-29"></a><a name="GracefulWorker"></a><span class='hs-comment'>-- Since 0.1.0.0</span>
<a name="line-30"></a><a name="GracefulWorker"></a><span class='hs-comment'>--</span>
<a name="line-31"></a><a name="GracefulWorker"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>GracefulWorker</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>resource</span> <span class='hs-varop'>.</span>
<a name="line-32"></a> <span class='hs-conid'>GracefulWorker</span> <span class='hs-layout'>{</span> <span class='hs-varid'>gracefulWorkerInitialize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>resource</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>gracefulWorkerApplication</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>resource</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>gracefulWorkerFinalize</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>resource</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-35"></a> <span class='hs-layout'>}</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="tryIO"></a><span class='hs-definition'>tryIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>IOException</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-definition'>tryIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="workerProcess"></a><span class='hs-comment'>-- | Worker process action</span>
<a name="line-41"></a><span class='hs-definition'>workerProcess</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GracefulWorker</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-42"></a><span class='hs-definition'>workerProcess</span> <span class='hs-conid'>GracefulWorker</span> <span class='hs-layout'>{</span> <span class='hs-varid'>gracefulWorkerInitialize</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialize</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>gracefulWorkerApplication</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>application</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>gracefulWorkerFinalize</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>finalize</span>
<a name="line-45"></a> <span class='hs-layout'>}</span> <span class='hs-varid'>sock</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-46"></a> <span class='hs-varid'>void</span> <span class='hs-varop'>$</span> <span class='hs-varid'>installHandler</span> <span class='hs-varid'>sigQUIT</span> <span class='hs-layout'>(</span><span class='hs-conid'>CatchOnce</span> <span class='hs-varop'>$</span> <span class='hs-varid'>close</span> <span class='hs-varid'>sock</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span>
<a name="line-47"></a> <span class='hs-varid'>count</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newTVarIO</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-varid'>void</span> <span class='hs-varop'>$</span> <span class='hs-varid'>tryIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>bracket</span> <span class='hs-varid'>initialize</span> <span class='hs-varid'>finalize</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>resource</span> <span class='hs-keyglyph'>-></span>
<a name="line-49"></a> <span class='hs-varid'>void</span> <span class='hs-varop'>$</span> <span class='hs-varid'>forever</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-50"></a> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>accept</span> <span class='hs-varid'>sock</span>
<a name="line-51"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>app</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>application</span> <span class='hs-varid'>s</span> <span class='hs-varid'>resource</span>
<a name="line-52"></a> <span class='hs-varid'>forkIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>bracket_</span>
<a name="line-53"></a> <span class='hs-layout'>(</span><span class='hs-varid'>atomically</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modifyTVar'</span> <span class='hs-varid'>count</span> <span class='hs-varid'>succ</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-layout'>(</span><span class='hs-varid'>atomically</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modifyTVar'</span> <span class='hs-varid'>count</span> <span class='hs-varid'>pred</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-layout'>(</span><span class='hs-varid'>app</span> <span class='hs-varop'>`finally`</span> <span class='hs-varid'>close</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-varid'>waitAllAction</span> <span class='hs-varid'>count</span>
<a name="line-57"></a> <span class='hs-varid'>close</span> <span class='hs-varid'>sock</span>
<a name="line-58"></a> <span class='hs-varid'>exitImmediately</span> <span class='hs-conid'>ExitSuccess</span>
<a name="line-59"></a> <span class='hs-keyword'>where</span>
<a name="line-60"></a> <span class='hs-varid'>waitAllAction</span> <span class='hs-varid'>count</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-61"></a> <span class='hs-varid'>active</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>atomically</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readTVar</span> <span class='hs-varid'>count</span>
<a name="line-62"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>active</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-63"></a> <span class='hs-varid'>threadDelay</span> <span class='hs-num'>1000</span>
<a name="line-64"></a> <span class='hs-varid'>waitAllAction</span> <span class='hs-varid'>count</span>
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