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Ruby On Rails in UA/Code Review, теоретические вопросы/Блокировка файлов

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2008-06-09 12:56:05	Ответить
Ruslan Voloshin Адрес: odessa Сообщений: 1231 Регистр: 2007-03-13 его блог 40 сообщ.	Блокировка файлов
	def flock(file, mode) success = file.flock(mode) if success begin yield file ensure file.flock(File::LOCK_UN) end end return success end #--- open('output', 'w') do \|f\| flock(f, File::LOCK_EX) do \|f\| f << "Kiss me, I've got a write lock on a file!" end end #--- def open_lock(filename, openmode="r", lockmode=nil) if openmode == 'r' \|\| openmode == 'rb' lockmode \|\|= File::LOCK_SH else lockmode \|\|= File::LOCK_EX end value = nil open(filename, openmode) do \|f\| flock(f, lockmode) do begin value = yield f ensure f.flock(File::LOCK_UN) # Comment this line out on Windows. end end return value end end #--- t1 = Thread.new do puts 'Thread 1 is requesting a lock.' open_lock('output', 'w') do \|f\| puts 'Thread 1 has acquired a lock.' f << "At last we're alone!" sleep(5) end puts 'Thread 1 has released its lock.' end t2 = Thread.new do puts 'Thread 2 is requesting a lock.' open_lock('output', 'r') do \|f\| puts 'Thread 2 has acquired a lock.' puts "File contents: #{f.read}" end puts 'Thread 2 has released its lock.' end t1.join t2.join # Thread 1 is requesting a lock. # Thread 1 has acquired a lock. # Thread 2 is requesting a lock. # Thread 1 has released its lock. # Thread 2 has acquired a lock. # File contents: At last we're alone! # Thread 2 has released its lock. #--- def try_lock puts "I couldn't get a lock." unless open_lock('contested', 'w', File::LOCK_EX \| File::LOCK_NB) do puts "I've got a lock!" true end end try_lock # I've got a lock! open('contested', 'w').flock(File::LOCK_EX) # Get a lock, hold it forever. try_lock # I couldn't get a lock. #--- ------------ Занимаюсь вебом и продвижением сайтов.
	file, File::LOCK_EX, flock, Thread.new

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