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-- Copyright (c) 2012 Robert G. Jakabosky <bobby@sharedrealm.com> | ||
-- | ||
-- Permission is hereby granted, free of charge, to any person obtaining a copy | ||
-- of this software and associated documentation files (the "Software"), to deal | ||
-- in the Software without restriction, including without limitation the rights | ||
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
-- copies of the Software, and to permit persons to whom the Software is | ||
-- furnished to do so, subject to the following conditions: | ||
-- | ||
-- The above copyright notice and this permission notice shall be included in | ||
-- all copies or substantial portions of the Software. | ||
-- | ||
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
-- THE SOFTWARE. | ||
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-- safe require. | ||
local require = require | ||
local function safe_require(...) | ||
return pcall(require, ...) | ||
end | ||
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local mod_name = ... | ||
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local backends = { | ||
"epoll", | ||
"ev", | ||
} | ||
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for i=1,#backends do | ||
local backend = backends[i] | ||
local name = mod_name .. '.' .. backend | ||
local status, mod = safe_require(name) | ||
if status then | ||
--print("Loaded backend:", name) | ||
return mod | ||
end | ||
end | ||
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error("Failed to load backend for: " .. mod_name) | ||
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-- Copyright (c) 2012 Robert G. Jakabosky <bobby@sharedrealm.com> | ||
-- | ||
-- Permission is hereby granted, free of charge, to any person obtaining a copy | ||
-- of this software and associated documentation files (the "Software"), to deal | ||
-- in the Software without restriction, including without limitation the rights | ||
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
-- copies of the Software, and to permit persons to whom the Software is | ||
-- furnished to do so, subject to the following conditions: | ||
-- | ||
-- The above copyright notice and this permission notice shall be included in | ||
-- all copies or substantial portions of the Software. | ||
-- | ||
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
-- THE SOFTWARE. | ||
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local ev = require'ev' | ||
local ev_READ = ev.READ | ||
local ev_WRITE = ev.WRITE | ||
local loop = ev.Loop.default | ||
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assert(ev.Idle,"Need version > 1.3 of lua-ev that supports Idle watchers.") | ||
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local poller_meths = {} | ||
local poller_mt = {__index = poller_meths} | ||
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local function poller_new() | ||
local self = { | ||
work_cur = {}, | ||
work_last = {}, | ||
io_events = 0, | ||
reads = {}, | ||
idle_enabled = false, | ||
} | ||
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self.idle = ev.Idle.new(function() | ||
local tasks = #self.work_cur | ||
-- check if there is any work | ||
if tasks > 0 then | ||
-- swap work queues. | ||
local last, cur = self.work_cur, self.work_last | ||
self.work_cur, self.work_last = cur, last | ||
for i=1,tasks do | ||
local task = last[i] | ||
last[i] = nil | ||
task() | ||
end | ||
-- check if there is more work. | ||
if #cur > 0 then | ||
return -- don't disable idle watcher, when we have work. | ||
end | ||
end | ||
--print("STOP IDLE:", #self.work_cur, #self.work_last) | ||
-- stop idle watcher, no work. | ||
self.idle_enabled = false | ||
self.idle:stop(loop) | ||
end) | ||
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return setmetatable(self, poller_mt) | ||
end | ||
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function poller_meths:add_work(task) | ||
local idx = #self.work_cur + 1 | ||
-- add task to current work queue. | ||
self.work_cur[idx] = task | ||
-- make sure the idle watcher is enabled. | ||
if not self.idle_enabled then | ||
self.idle_enabled = true | ||
self.idle:start(loop) | ||
end | ||
end | ||
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function poller_meths:add_read(fd, cb) | ||
local io_read = self.reads[fd] | ||
-- make sure read event hasn't been registered yet. | ||
if not io_read then | ||
self.io_events = self.io_events + 1 | ||
io_read = ev.IO.new(function() | ||
cb(fd) | ||
end, fd, ev_READ) | ||
self.reads[fd] = io_read | ||
io_read:start(loop) | ||
else | ||
-- update read callback? | ||
io_read:callback(cb) | ||
-- need to re-start watcher? | ||
if not io_read:is_active() then | ||
io_read:start(loop) | ||
end | ||
end | ||
end | ||
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function poller_meths:remove_read(fd) | ||
local io_read = self.reads[fd] | ||
-- make sure there was a read event registered. | ||
if io_read then | ||
self.io_events = self.io_events - 1 | ||
io_read:stop(loop) | ||
end | ||
end | ||
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function poller_meths:start() | ||
return loop:loop() | ||
end | ||
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function poller_meths:stop() | ||
return loop:unloop() | ||
end | ||
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-- module only exports a 'new' function. | ||
return { | ||
new = poller_new, | ||
} |