Module: Sync_m

Included in:
Sync
Defined in:
lib/sync.rb

Defined Under Namespace

Classes: Err

Constant Summary collapse

RCS_ID = 
'-$Header$-'
UN =

lock mode

:UN
SH = 
:SH
EX = 
:EX

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#sync_ex_count ⇒ Object

Returns the value of attribute sync_ex_count.



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# File 'lib/sync.rb', line 241

def sync_ex_count
  @sync_ex_count
end

#sync_ex_locker ⇒ Object

Returns the value of attribute sync_ex_locker.



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# File 'lib/sync.rb', line 240

def sync_ex_locker
  @sync_ex_locker
end

#sync_mode ⇒ Object

Returns the value of attribute sync_mode.



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

def sync_mode
  @sync_mode
end

#sync_sh_locker ⇒ Object

Returns the value of attribute sync_sh_locker.



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

def sync_sh_locker
  @sync_sh_locker
end

#sync_upgrade_waiting ⇒ Object

Returns the value of attribute sync_upgrade_waiting.



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# File 'lib/sync.rb', line 238

def sync_upgrade_waiting
  @sync_upgrade_waiting
end

#sync_waiting ⇒ Object

Returns the value of attribute sync_waiting.



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

def sync_waiting
  @sync_waiting
end

Class Method Details

.append_features(cl) ⇒ Object 



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# File 'lib/sync.rb', line 90

def Sync_m.append_features(cl)
  super
  unless cl.instance_of?(Module)
    # do nothing for Modules
    # make aliases and include the proper module.
    define_aliases(cl)
  end
end

.define_aliases(cl) ⇒ Object 



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# File 'lib/sync.rb', line 78

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

.extend_object(obj) ⇒ Object 



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# File 'lib/sync.rb', line 99

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

Instance Method Details

#sync_exclusive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sync.rb', line 126

def sync_exclusive?
  sync_mode == EX
end

#sync_extended ⇒ Object 



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# File 'lib/sync.rb', line 104

def sync_extended
  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

#sync_lock(m = EX) ⇒ Object 



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# File 'lib/sync.rb', line 140

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

  until (Thread.critical = true; sync_try_lock_sub(m))
    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
    Thread.stop
  end
  Thread.critical = false
  self
end

#sync_locked? ⇒ Boolean

accessing

Returns:

  • (Boolean) 


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# File 'lib/sync.rb', line 118

def sync_locked?
  sync_mode != UN
end

#sync_shared? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sync.rb', line 122

def sync_shared?
  sync_mode == SH
end

#sync_synchronize(mode = EX) ⇒ Object 



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# File 'lib/sync.rb', line 226

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

#sync_try_lock(mode = EX) ⇒ Object

locking methods.



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# File 'lib/sync.rb', line 131

def sync_try_lock(mode = EX)
  return unlock if sync_mode == UN
  
  Thread.critical = true
  ret = sync_try_lock_sub(sync_mode)
  Thread.critical = false
  ret
end

#sync_unlock(m = EX) ⇒ Object 



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# File 'lib/sync.rb', line 156

def sync_unlock(m = EX)
  Thread.critical = true
  if sync_mode == UN
    Thread.critical = false
    Err::UnknownLocker.Fail(Thread.current)
  end
  
  m = sync_mode if m == EX and sync_mode == SH
  
  runnable = false
  case m
  when UN
    Thread.critical = false
    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
	for k, v in sync_upgrade_waiting
 sync_sh_locker[k] = v
	end
	wait = sync_upgrade_waiting
	self.sync_upgrade_waiting = []
	Thread.critical = false
	
	for w, v in wait
 w.run
	end
    else
	wait = sync_waiting
	self.sync_waiting = []
	Thread.critical = false
	for w in wait
 w.run
	end
    end
  end
  
  Thread.critical = false
  self
end