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bin/gems/io-event-1.9.0/releases.md

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+# Releases
+
+## v1.9.0
+
+### Improved `IO::Event::Profiler` for detecting stalls.
+
+A new `IO::Event::Profiler` class has been added to help detect stalls in the event loop. The previous approach was insufficient to detect all possible stalls. This new approach uses the `RUBY_EVENT_FIBER_SWITCH` event to track context switching by the scheduler, and can detect stalls no matter how they occur.
+
+``` ruby
+profiler = IO::Event::Profiler.new
+
+profiler.start
+		
+Fiber.new do
+	sleep 1.0
+end.transfer
+
+profiler.stop
+```
+
+A default profiler is exposed using `IO::Event::Profiler.default` which is controlled by the following environment variables:
+
+  - `IO_EVENT_PROFILER=true` - Enable the profiler, otherwise `IO::Event::Profiler.default` will return `nil`.
+  - `IO_EVENT_PROFILER_LOG_THRESHOLD` - Specify the threshold in seconds for logging a stall. Defaults to `0.01`.
+  - `IO_EVENT_PROFILER_TRACK_CALLS` - Track the method call for each event, in order to log specifically which method is causing the stall. Defaults to `true`.
+
+The previous environment variables `IO_EVENT_SELECTOR_STALL_LOG_THRESHOLD` and `IO_EVENT_SELECTOR_STALL_LOG` no longer have any effect.
+
+## v1.8.0
+
+### Detecting fibers that are stalling the event loop.
+
+A new (experimental) feature for detecting fiber stalls has been added. This feature is disabled by default and can be enabled by setting the `IO_EVENT_SELECTOR_STALL_LOG_THRESHOLD` to `true` or a floating point number representing the threshold in seconds.
+
+When enabled, the event loop will measure and profile user code when resuming a fiber. If the fiber takes too long to return back to the event loop, the event loop will log a warning message with a profile of the fiber's execution.
+
+    > cat test.rb 
+    #!/usr/bin/env ruby
+    
+    require_relative "lib/async"
+    
+    Async do
+    	Fiber.blocking do
+    		sleep 1
+    	end
+    end
+    
+    > IO_EVENT_SELECTOR_STALL_LOG_THRESHOLD=true bundle exec ./test.rb
+    Fiber stalled for 1.003 seconds
+    	/home/samuel/Developer/socketry/async/test.rb:6 in '#<Class:Fiber>#blocking' (1s)
+    		/home/samuel/Developer/socketry/async/test.rb:7 in 'Kernel#sleep' (1s)
+
+There is a performance overhead to this feature, so it is recommended to only enable it when debugging performance issues.
+
+## v1.7.5
+
+  - Fix `process_wait` race condition on EPoll that could cause a hang.