Class: OsCtld::Lockable::Lock
- Inherits:
-
Object
- Object
- OsCtld::Lockable::Lock
- Defined in:
- lib/osctld/lockable.rb
Constant Summary collapse
- TIMEOUT =
90
Instance Method Summary collapse
- #acquire_exclusive ⇒ Object
- #acquire_inclusive ⇒ Object
- #exclusively ⇒ Object
- #inclusively ⇒ Object
-
#initialize(object) ⇒ Lock
constructor
A new instance of Lock.
- #release_exclusive ⇒ Object
- #release_inclusive ⇒ Object
Constructor Details
#initialize(object) ⇒ Lock
Returns a new instance of Lock.
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# File 'lib/osctld/lockable.rb', line 34 def initialize(object) @mutex = OsCtl::Lib::Mutex.new @in_held = [] @in_queued = [] @ex_queued = [] @ex = nil @cond_ex = ConditionVariable.new @cond_in = ConditionVariable.new @object = object end |
Instance Method Details
#acquire_exclusive ⇒ Object
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# File 'lib/osctld/lockable.rb', line 117 def acquire_exclusive return if @mutex.owned? && @ex == Thread.current t = Time.now is_timeout = false LockRegistry.register(@object, :exclusive, :waiting) begin @mutex.lock(TIMEOUT) rescue OsCtl::Lib::Mutex::Timeout LockRegistry.register(@object, :exclusive, :timeout) raise OsCtld::DeadlockDetected.new(@object, :exclusive) end if @in_held.empty? @ex = Thread.current LockRegistry.register(@object, :exclusive, :locked) elsif @in_held.include?(Thread.current) @mutex.unlock fail 'attempted to acquire exclusive lock while holding inclusive lock' else @ex_queued << Thread.current # Wait for all inclusive blocks to finish LockRegistry.register(@object, :exclusive, :waiting) loop do now = Time.now if (now - t) >= TIMEOUT is_timeout = true break elsif @in_held.empty? && @ex.nil? break end @cond_ex.wait(@mutex, TIMEOUT - (now - t)) end if (!@in_held.empty? || @ex) && is_timeout LockRegistry.register(@object, :exclusive, :timeout) @mutex.unlock raise OsCtld::DeadlockDetected.new(@object, :exclusive) else @ex = @ex_queued.shift LockRegistry.register(@object, :exclusive, :locked) end end end |
#acquire_inclusive ⇒ Object
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# File 'lib/osctld/lockable.rb', line 45 def acquire_inclusive t = Time.now is_timeout = false sync do if @ex_queued.any? @in_queued << Thread.current # Wait for the exclusive lock to finish, if there is one LockRegistry.register(@object, :inclusive, :waiting) loop do now = Time.now if (now - t) >= TIMEOUT is_timeout = true break elsif @ex.nil? break end @cond_in.wait(@mutex, TIMEOUT - (now - t)) end if @ex && is_timeout LockRegistry.register(@object, :inclusive, :timeout) raise OsCtld::DeadlockDetected.new(@object, :inclusive) else @in_queued.delete(Thread.current) @in_held << Thread.current LockRegistry.register(@object, :inclusive, :locked) end else @in_held << Thread.current LockRegistry.register(@object, :inclusive, :locked) end end end |
#exclusively ⇒ Object
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# File 'lib/osctld/lockable.rb', line 192 def exclusively if @mutex.owned? && @ex == Thread.current yield else acquire_exclusive begin yield ensure release_exclusive end end end |
#inclusively ⇒ Object
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# File 'lib/osctld/lockable.rb', line 96 def inclusively return yield if @mutex.owned? && @ex == Thread.current held = false sync { held = @in_held.include?(Thread.current) } if held yield else acquire_inclusive begin yield ensure release_inclusive end end end |
#release_exclusive ⇒ Object
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# File 'lib/osctld/lockable.rb', line 171 def release_exclusive unless @mutex.owned? raise "expected to own the mutex, have you called acquire_exclusive first?" end # Leave exlusive block, signal waiting inclusive blocks to continue @ex = nil LockRegistry.register(@object, :exclusive, :unlocked) # Give the first chance to a round of inclusive locks, then exclusive # ones if @in_queued.any? @cond_in.broadcast elsif @ex_queued.any? @cond_ex.signal end @mutex.unlock end |
#release_inclusive ⇒ Object
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# File 'lib/osctld/lockable.rb', line 86 def release_inclusive sync do @in_held.delete(Thread.current) LockRegistry.register(@object, :inclusive, :unlocked) # Start exclusive block, if there is one waiting @cond_ex.signal if @in_held.empty? && @ex_queued.any? end end |