Module: Sync_m

Defined in:
lib/sync.rb

Defined Under Namespace

Classes: Err

Constant Summary

RCS_ID = 
'-$Id: sync.rb 25189 2009-10-02 12:04:37Z akr $-'
UN =

lock mode

:UN
SH = 
:SH
EX = 
:EX

Instance Attribute Summary (collapse)

Class Method Summary (collapse)

Instance Method Summary (collapse)

Instance Attribute Details

- (Object) sync_ex_count

Returns the value of attribute sync_ex_count



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# File 'lib/sync.rb', line 237

def sync_ex_count
  @sync_ex_count
end

- (Object) sync_ex_locker

Returns the value of attribute sync_ex_locker



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# File 'lib/sync.rb', line 236

def sync_ex_locker
  @sync_ex_locker
end

- (Object) sync_mode

Returns the value of attribute sync_mode



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# File 'lib/sync.rb', line 231

def sync_mode
  @sync_mode
end

- (Object) sync_sh_locker

Returns the value of attribute sync_sh_locker



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# File 'lib/sync.rb', line 235

def sync_sh_locker
  @sync_sh_locker
end

- (Object) sync_upgrade_waiting

Returns the value of attribute sync_upgrade_waiting



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# File 'lib/sync.rb', line 234

def sync_upgrade_waiting
  @sync_upgrade_waiting
end

- (Object) sync_waiting

Returns the value of attribute sync_waiting



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# File 'lib/sync.rb', line 233

def sync_waiting
  @sync_waiting
end

Class Method Details

+ (Object) append_features(cl) 



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# File 'lib/sync.rb', line 88

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

+ (Object) define_aliases(cl) 



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# File 'lib/sync.rb', line 76

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

+ (Object) extend_object(obj) 



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# File 'lib/sync.rb', line 96

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

Instance Method Details

- (Boolean) sync_exclusive?

Returns:

  • (Boolean) 


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# File 'lib/sync.rb', line 123

def sync_exclusive?
  sync_mode == EX
end

- (Object) sync_extend 



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# File 'lib/sync.rb', line 101

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(class<<self;self;end)
  end
  sync_initialize
end

- (Object) sync_inspect 



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# File 'lib/sync.rb', line 239

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

- (Object) sync_lock(m = EX) 



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# File 'lib/sync.rb', line 136

def sync_lock(m = EX)
  return unlock if m == UN

  while true
    @sync_mutex.synchronize do
	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
   sync_waiting.push Thread.current
 end
 @sync_mutex.sleep
	end
    end
  end
  self
end

- (Boolean) sync_locked?

accessing

Returns:

  • (Boolean) 


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# File 'lib/sync.rb', line 115

def sync_locked?
  sync_mode != UN
end

- (Boolean) sync_shared?

Returns:

  • (Boolean) 


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# File 'lib/sync.rb', line 119

def sync_shared?
  sync_mode == SH
end

- (Object) sync_synchronize(mode = EX) 



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# File 'lib/sync.rb', line 222

def sync_synchronize(mode = EX)
  sync_lock(mode)
  begin
    yield
  ensure
    sync_unlock
  end
end

- (Object) sync_try_lock(mode = EX)

locking methods.



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# File 'lib/sync.rb', line 128

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

- (Object) sync_unlock(m = EX) 



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# File 'lib/sync.rb', line 157

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