Class: BreakingMutex

Inherits:
Object
  • Object
show all
Defined in:
lib/appswarm/breaking_mutex.rb

Overview

BreakingMutex=Mutex

Constant Summary collapse

GRANULARITY = 
20
TRIES = 
10

Instance Method Summary collapse

Constructor Details

#initialize(timeout = 2) ⇒ BreakingMutex

Returns a new instance of BreakingMutex.



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# File 'lib/appswarm/breaking_mutex.rb', line 5

def initialize(timeout=2)
  @timeout=timeout
  #@mutex=Mutex.new
  @mutex=false
end

Instance Method Details

#synchronize(&b) ⇒ Object 



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# File 'lib/appswarm/breaking_mutex.rb', line 10

def synchronize(&b)
  done=false
  start=Time.now
  while not done and (Time.now-start)<@timeout
    puts "enter critical"
    Thread.critical=true
      ok=false
      if @mutex==false
        @mutex=true
        ok=true
      end
    puts "leaving critical"
    Thread.critical=false
      if ok==true
        puts "running"
        b.call
        done=true
      end
    if ok==true
      puts "enter critical"
      Thread.critical=true
        @mutex=false
      Thread.critical=false
      puts "leaving critical"
    end
    time=(@timeout/TRIES.to_f)*rand(GRANULARITY)/GRANULARITY.to_f
    puts "SLEEP #{time}"
    sleep time unless done
  end
  puts "DONE"
end