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Edit File : sync.rb \| Size : 7.25 KB
# # sync.rb - 2 phase lock with counter # $Release Version: 1.0$ # $Revision: 40825 $ # by Keiju ISHITSUKA(keiju@ishitsuka.com) # # -- # Sync_m, Synchronizer_m # Usage: # obj.extend(Sync_m) # or # class Foo # include Sync_m # : # end # # Sync_m#sync_mode # Sync_m#sync_locked?, locked? # Sync_m#sync_shared?, shared? # Sync_m#sync_exclusive?, sync_exclusive? # Sync_m#sync_try_lock, try_lock # Sync_m#sync_lock, lock # Sync_m#sync_unlock, unlock # # Sync, Synchronizer: # Usage: # sync = Sync.new # # Sync#mode # Sync#locked? # Sync#shared? # Sync#exclusive? # Sync#try_lock(mode) -- mode = :EX, :SH, :UN # Sync#lock(mode) -- mode = :EX, :SH, :UN # Sync#unlock # Sync#synchronize(mode) {...} # # unless defined? Thread raise "Thread not available for this ruby interpreter" end ## # A module that provides a two-phase lock with a counter. module Sync_m # lock mode UN = :UN SH = :SH EX = :EX # exceptions class Err < StandardError def Err.Fail(opt) fail self, sprintf(self::Message, opt) end class UnknownLocker < Err Message = "Thread(%s) not locked." def UnknownLocker.Fail(th) super(th.inspect) end end class LockModeFailer < Err Message = "Unknown lock mode(%s)" def LockModeFailer.Fail(mode) if mode.id2name mode = id2name end super(mode) end end end def Sync_m.define_aliases(cl) cl.module_eval %q{ alias locked? sync_locked? alias shared? sync_shared? alias exclusive? sync_exclusive? alias lock sync_lock alias unlock sync_unlock alias try_lock sync_try_lock alias synchronize sync_synchronize } end def Sync_m.append_features(cl) super # do nothing for Modules # make aliases for Classes. define_aliases(cl) unless cl.instance_of?(Module) self end def Sync_m.extend_object(obj) super obj.sync_extend end def sync_extend unless (defined? locked? and defined? shared? and defined? exclusive? and defined? lock and defined? unlock and defined? try_lock and defined? synchronize) Sync_m.define_aliases(singleton_class) end sync_initialize end # accessing def sync_locked? sync_mode != UN end def sync_shared? sync_mode == SH end def sync_exclusive? sync_mode == EX end # locking methods. def sync_try_lock(mode = EX) return unlock if mode == UN @sync_mutex.synchronize do sync_try_lock_sub(mode) end end def sync_lock(m = EX) return unlock if m == UN Thread.handle_interrupt(StandardError => :on_blocking) do while true @sync_mutex.synchronize do begin if sync_try_lock_sub(m) return self else if sync_sh_locker[Thread.current] sync_upgrade_waiting.push [Thread.current, sync_sh_locker[Thread.current]] sync_sh_locker.delete(Thread.current) else unless sync_waiting.include?(Thread.current) \|\| sync_upgrade_waiting.reverse_each.any?{\|w\| w.first == Thread.current } sync_waiting.push Thread.current end end @sync_mutex.sleep end ensure sync_waiting.delete(Thread.current) end end end end self end def sync_unlock(m = EX) wakeup_threads = [] @sync_mutex.synchronize do if sync_mode == UN Err::UnknownLocker.Fail(Thread.current) end m = sync_mode if m == EX and sync_mode == SH runnable = false case m when UN Err::UnknownLocker.Fail(Thread.current) when EX if sync_ex_locker == Thread.current if (self.sync_ex_count = sync_ex_count - 1) == 0 self.sync_ex_locker = nil if sync_sh_locker.include?(Thread.current) self.sync_mode = SH else self.sync_mode = UN end runnable = true end else Err::UnknownLocker.Fail(Thread.current) end when SH if (count = sync_sh_locker[Thread.current]).nil? Err::UnknownLocker.Fail(Thread.current) else if (sync_sh_locker[Thread.current] = count - 1) == 0 sync_sh_locker.delete(Thread.current) if sync_sh_locker.empty? and sync_ex_count == 0 self.sync_mode = UN runnable = true end end end end if runnable if sync_upgrade_waiting.size > 0 th, count = sync_upgrade_waiting.shift sync_sh_locker[th] = count th.wakeup wakeup_threads.push th else wait = sync_waiting self.sync_waiting = [] for th in wait th.wakeup wakeup_threads.push th end end end end for th in wakeup_threads th.run end self end def sync_synchronize(mode = EX) Thread.handle_interrupt(StandardError => :on_blocking) do sync_lock(mode) begin yield ensure sync_unlock end end end attr_accessor :sync_mode attr_accessor :sync_waiting attr_accessor :sync_upgrade_waiting attr_accessor :sync_sh_locker attr_accessor :sync_ex_locker attr_accessor :sync_ex_count def sync_inspect sync_iv = instance_variables.select{\|iv\| /^@sync_/ =~ iv.id2name}.collect{\|iv\| iv.id2name + '=' + instance_eval(iv.id2name).inspect}.join(",") print "<#{self.class}.extend Sync_m: #{inspect}, <Sync_m: #{sync_iv}>" end private def sync_initialize @sync_mode = UN @sync_waiting = [] @sync_upgrade_waiting = [] @sync_sh_locker = Hash.new @sync_ex_locker = nil @sync_ex_count = 0 @sync_mutex = Mutex.new end def initialize(*args) super sync_initialize end def sync_try_lock_sub(m) case m when SH case sync_mode when UN self.sync_mode = m sync_sh_locker[Thread.current] = 1 ret = true when SH count = 0 unless count = sync_sh_locker[Thread.current] sync_sh_locker[Thread.current] = count + 1 ret = true when EX # in EX mode, lock will upgrade to EX lock if sync_ex_locker == Thread.current self.sync_ex_count = sync_ex_count + 1 ret = true else ret = false end end when EX if sync_mode == UN or sync_mode == SH && sync_sh_locker.size == 1 && sync_sh_locker.include?(Thread.current) self.sync_mode = m self.sync_ex_locker = Thread.current self.sync_ex_count = 1 ret = true elsif sync_mode == EX && sync_ex_locker == Thread.current self.sync_ex_count = sync_ex_count + 1 ret = true else ret = false end else Err::LockModeFailer.Fail mode end return ret end end ## # An alias for Sync_m from sync.rb Synchronizer_m = Sync_m ## # A class that provides two-phase lock with a counter. See Sync_m for # details. class Sync include Sync_m end ## # An alias for Sync from sync.rb. See Sync_m for details. Synchronizer = Sync Back

Edit File : sync.rb | Size : 7.25 KB

#
#   sync.rb - 2 phase lock with counter
#       $Release Version: 1.0$
#       $Revision: 40825 $
#       by Keiju ISHITSUKA(keiju@ishitsuka.com)
#
# --
#  Sync_m, Synchronizer_m
#  Usage:
#   obj.extend(Sync_m)
#   or
#   class Foo
#       include Sync_m
#       :
#   end
#
#   Sync_m#sync_mode
#   Sync_m#sync_locked?, locked?
#   Sync_m#sync_shared?, shared?
#   Sync_m#sync_exclusive?, sync_exclusive?
#   Sync_m#sync_try_lock, try_lock
#   Sync_m#sync_lock, lock
#   Sync_m#sync_unlock, unlock
#
#  Sync, Synchronizer:
#  Usage:
#   sync = Sync.new
#
#   Sync#mode
#   Sync#locked?
#   Sync#shared?
#   Sync#exclusive?
#   Sync#try_lock(mode) -- mode = :EX, :SH, :UN
#   Sync#lock(mode)     -- mode = :EX, :SH, :UN
#   Sync#unlock
#   Sync#synchronize(mode) {...}
#
#

unless defined? Thread
  raise "Thread not available for this ruby interpreter"
end

##
# A module that provides a two-phase lock with a counter.

module Sync_m
  # lock mode
  UN = :UN
  SH = :SH
  EX = :EX

# exceptions
  class Err < StandardError
    def Err.Fail(*opt)
      fail self, sprintf(self::Message, *opt)
    end

class UnknownLocker < Err
      Message = "Thread(%s) not locked."
      def UnknownLocker.Fail(th)
        super(th.inspect)
      end
    end

class LockModeFailer < Err
      Message = "Unknown lock mode(%s)"
      def LockModeFailer.Fail(mode)
        if mode.id2name
          mode = id2name
        end
        super(mode)
      end
    end
  end

def Sync_m.define_aliases(cl)
    cl.module_eval %q{
      alias locked? sync_locked?
      alias shared? sync_shared?
      alias exclusive? sync_exclusive?
      alias lock sync_lock
      alias unlock sync_unlock
      alias try_lock sync_try_lock
      alias synchronize sync_synchronize
    }
  end

def Sync_m.append_features(cl)
    super
    # do nothing for Modules
    # make aliases for Classes.
    define_aliases(cl) unless cl.instance_of?(Module)
    self
  end

def Sync_m.extend_object(obj)
    super
    obj.sync_extend
  end

def sync_extend
    unless (defined? locked? and
            defined? shared? and
            defined? exclusive? and
            defined? lock and
            defined? unlock and
            defined? try_lock and
            defined? synchronize)
      Sync_m.define_aliases(singleton_class)
    end
    sync_initialize
  end

# accessing
  def sync_locked?
    sync_mode != UN
  end

def sync_shared?
    sync_mode == SH
  end

def sync_exclusive?
    sync_mode == EX
  end

# locking methods.
  def sync_try_lock(mode = EX)
    return unlock if mode == UN
    @sync_mutex.synchronize do
      sync_try_lock_sub(mode)
    end
  end

def sync_lock(m = EX)
    return unlock if m == UN
    Thread.handle_interrupt(StandardError => :on_blocking) do
      while true
        @sync_mutex.synchronize do
          begin
            if sync_try_lock_sub(m)
              return self
            else
              if sync_sh_locker[Thread.current]
                sync_upgrade_waiting.push [Thread.current, sync_sh_locker[Thread.current]]
                sync_sh_locker.delete(Thread.current)
              else
                unless sync_waiting.include?(Thread.current) || sync_upgrade_waiting.reverse_each.any?{|w| w.first == Thread.current }
                  sync_waiting.push Thread.current
                end
              end
              @sync_mutex.sleep
            end
          ensure
            sync_waiting.delete(Thread.current)
          end
        end
      end
    end
    self
  end

def sync_unlock(m = EX)
    wakeup_threads = []
    @sync_mutex.synchronize do
      if sync_mode == UN
        Err::UnknownLocker.Fail(Thread.current)
      end

m = sync_mode if m == EX and sync_mode == SH

runnable = false
      case m
      when UN
        Err::UnknownLocker.Fail(Thread.current)

when EX
        if sync_ex_locker == Thread.current
          if (self.sync_ex_count = sync_ex_count - 1) == 0
            self.sync_ex_locker = nil
            if sync_sh_locker.include?(Thread.current)
              self.sync_mode = SH
            else
              self.sync_mode = UN
            end
            runnable = true
          end
        else
          Err::UnknownLocker.Fail(Thread.current)
        end

when SH
        if (count = sync_sh_locker[Thread.current]).nil?
          Err::UnknownLocker.Fail(Thread.current)
        else
          if (sync_sh_locker[Thread.current] = count - 1) == 0
            sync_sh_locker.delete(Thread.current)
            if sync_sh_locker.empty? and sync_ex_count == 0
              self.sync_mode = UN
              runnable = true
            end
          end
        end
      end

if runnable
        if sync_upgrade_waiting.size > 0
          th, count = sync_upgrade_waiting.shift
          sync_sh_locker[th] = count
          th.wakeup
          wakeup_threads.push th
        else
          wait = sync_waiting
          self.sync_waiting = []
          for th in wait
            th.wakeup
            wakeup_threads.push th
          end
        end
      end
    end
    for th in wakeup_threads
      th.run
    end
    self
  end

def sync_synchronize(mode = EX)
    Thread.handle_interrupt(StandardError => :on_blocking) do
      sync_lock(mode)
      begin
        yield
      ensure
        sync_unlock
      end
    end
  end

attr_accessor :sync_mode

attr_accessor :sync_waiting
  attr_accessor :sync_upgrade_waiting
  attr_accessor :sync_sh_locker
  attr_accessor :sync_ex_locker
  attr_accessor :sync_ex_count

def sync_inspect
    sync_iv = instance_variables.select{|iv| /^@sync_/ =~ iv.id2name}.collect{|iv| iv.id2name + '=' + instance_eval(iv.id2name).inspect}.join(",")
    print "<#{self.class}.extend Sync_m: #{inspect}, <Sync_m: #{sync_iv}>"
  end

private

def sync_initialize
    @sync_mode = UN
    @sync_waiting = []
    @sync_upgrade_waiting = []
    @sync_sh_locker = Hash.new
    @sync_ex_locker = nil
    @sync_ex_count = 0

@sync_mutex = Mutex.new
  end

def initialize(*args)
    super
    sync_initialize
  end

def sync_try_lock_sub(m)
    case m
    when SH
      case sync_mode
      when UN
        self.sync_mode = m
        sync_sh_locker[Thread.current] = 1
        ret = true
      when SH
        count = 0 unless count = sync_sh_locker[Thread.current]
        sync_sh_locker[Thread.current] = count + 1
        ret = true
      when EX
        # in EX mode, lock will upgrade to EX lock
        if sync_ex_locker == Thread.current
          self.sync_ex_count = sync_ex_count + 1
          ret = true
        else
          ret = false
        end
      end
    when EX
      if sync_mode == UN or
          sync_mode == SH && sync_sh_locker.size == 1 && sync_sh_locker.include?(Thread.current)
        self.sync_mode = m
        self.sync_ex_locker = Thread.current
        self.sync_ex_count = 1
        ret = true
      elsif sync_mode == EX && sync_ex_locker == Thread.current
        self.sync_ex_count = sync_ex_count + 1
        ret = true
      else
        ret = false
      end
    else
      Err::LockModeFailer.Fail mode
    end
    return ret
  end
end

##
# An alias for Sync_m from sync.rb

Synchronizer_m = Sync_m

##
# A class that provides two-phase lock with a counter.  See Sync_m for
# details.

class Sync
  include Sync_m
end

##
# An alias for Sync from sync.rb.  See Sync_m for details.

Synchronizer = Sync

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