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Diffstat (limited to 'trunk/lib/thread.rb')
| -rw-r--r-- | trunk/lib/thread.rb | 367 |
1 files changed, 0 insertions, 367 deletions
diff --git a/trunk/lib/thread.rb b/trunk/lib/thread.rb deleted file mode 100644 index 68eeaf5b05..0000000000 --- a/trunk/lib/thread.rb +++ /dev/null @@ -1,367 +0,0 @@ -# -# thread.rb - thread support classes -# by Yukihiro Matsumoto <matz@netlab.co.jp> -# -# Copyright (C) 2001 Yukihiro Matsumoto -# Copyright (C) 2000 Network Applied Communication Laboratory, Inc. -# Copyright (C) 2000 Information-technology Promotion Agency, Japan -# - -unless defined? Thread - raise "Thread not available for this ruby interpreter" -end - -unless defined? ThreadError - class ThreadError < StandardError - end -end - -if $DEBUG - Thread.abort_on_exception = true -end - -# -# ConditionVariable objects augment class Mutex. Using condition variables, -# it is possible to suspend while in the middle of a critical section until a -# resource becomes available. -# -# Example: -# -# require 'thread' -# -# mutex = Mutex.new -# resource = ConditionVariable.new -# -# a = Thread.new { -# mutex.synchronize { -# # Thread 'a' now needs the resource -# resource.wait(mutex) -# # 'a' can now have the resource -# } -# } -# -# b = Thread.new { -# mutex.synchronize { -# # Thread 'b' has finished using the resource -# resource.signal -# } -# } -# -class ConditionVariable - # - # Creates a new ConditionVariable - # - def initialize - @waiters = [] - @waiters_mutex = Mutex.new - end - - # - # Releases the lock held in +mutex+ and waits; reacquires the lock on wakeup. - # - def wait(mutex) - begin - # TODO: mutex should not be used - @waiters_mutex.synchronize do - @waiters.push(Thread.current) - end - mutex.sleep - end - end - - # - # Wakes up the first thread in line waiting for this lock. - # - def signal - begin - t = @waiters_mutex.synchronize { @waiters.shift } - t.run if t - rescue ThreadError - retry - end - end - - # - # Wakes up all threads waiting for this lock. - # - def broadcast - # TODO: imcomplete - waiters0 = nil - @waiters_mutex.synchronize do - waiters0 = @waiters.dup - @waiters.clear - end - for t in waiters0 - begin - t.run - rescue ThreadError - end - end - end -end - -# -# This class provides a way to synchronize communication between threads. -# -# Example: -# -# require 'thread' -# -# queue = Queue.new -# -# producer = Thread.new do -# 5.times do |i| -# sleep rand(i) # simulate expense -# queue << i -# puts "#{i} produced" -# end -# end -# -# consumer = Thread.new do -# 5.times do |i| -# value = queue.pop -# sleep rand(i/2) # simulate expense -# puts "consumed #{value}" -# end -# end -# -# consumer.join -# -class Queue - # - # Creates a new queue. - # - def initialize - @que = [] - @waiting = [] - @que.taint # enable tainted comunication - @waiting.taint - self.taint - @mutex = Mutex.new - end - - # - # Pushes +obj+ to the queue. - # - def push(obj) - t = nil - @mutex.synchronize{ - @que.push obj - begin - t = @waiting.shift - t.wakeup if t - rescue ThreadError - retry - end - } - begin - t.run if t - rescue ThreadError - end - end - - # - # Alias of push - # - alias << push - - # - # Alias of push - # - alias enq push - - # - # Retrieves data from the queue. If the queue is empty, the calling thread is - # suspended until data is pushed onto the queue. If +non_block+ is true, the - # thread isn't suspended, and an exception is raised. - # - def pop(non_block=false) - while true - @mutex.synchronize{ - if @que.empty? - raise ThreadError, "queue empty" if non_block - @waiting.push Thread.current - @mutex.sleep - else - return @que.shift - end - } - end - end - - # - # Alias of pop - # - alias shift pop - - # - # Alias of pop - # - alias deq pop - - # - # Returns +true+ if the queue is empty. - # - def empty? - @que.empty? - end - - # - # Removes all objects from the queue. - # - def clear - @que.clear - end - - # - # Returns the length of the queue. - # - def length - @que.length - end - - # - # Alias of length. - # - alias size length - - # - # Returns the number of threads waiting on the queue. - # - def num_waiting - @waiting.size - end -end - -# -# This class represents queues of specified size capacity. The push operation -# may be blocked if the capacity is full. -# -# See Queue for an example of how a SizedQueue works. -# -class SizedQueue < Queue - # - # Creates a fixed-length queue with a maximum size of +max+. - # - def initialize(max) - raise ArgumentError, "queue size must be positive" unless max > 0 - @max = max - @queue_wait = [] - @queue_wait.taint # enable tainted comunication - super() - end - - # - # Returns the maximum size of the queue. - # - def max - @max - end - - # - # Sets the maximum size of the queue. - # - def max=(max) - diff = nil - @mutex.synchronize { - if max <= @max - @max = max - else - diff = max - @max - @max = max - end - } - if diff - diff.times do - begin - t = @queue_wait.shift - t.run if t - rescue ThreadError - retry - end - end - end - max - end - - # - # Pushes +obj+ to the queue. If there is no space left in the queue, waits - # until space becomes available. - # - def push(obj) - t = nil - @mutex.synchronize{ - while true - break if @que.length <= @max - @queue_wait.push Thread.current - @mutex.sleep - end - - @que.push obj - begin - t = @waiting.shift - t.wakeup if t - rescue ThreadError - retry - end - } - - begin - t.run if t - rescue ThreadError - end - end - - # - # Alias of push - # - alias << push - - # - # Alias of push - # - alias enq push - - # - # Retrieves data from the queue and runs a waiting thread, if any. - # - def pop(*args) - retval = super - t = nil - @mutex.synchronize { - if @que.length < @max - begin - t = @queue_wait.shift - t.wakeup if t - rescue ThreadError - retry - end - end - } - begin - t.run if t - rescue ThreadError - end - retval - end - - # - # Alias of pop - # - alias shift pop - - # - # Alias of pop - # - alias deq pop - - # - # Returns the number of threads waiting on the queue. - # - def num_waiting - @waiting.size + @queue_wait.size - end -end - -# Documentation comments: -# - How do you make RDoc inherit documentation from superclass? |