# Releases

## v1.14.4

  - Allow `epoll_pwait2` to be disabled via `--disable-epoll_pwait2`.

## v1.14.3

  - Fix several implementation bugs that could cause deadlocks on blocking writes.

## v1.14.0

### Enhanced `IO::Event::PriorityHeap` with deletion and bulk insertion methods

The {ruby IO::Event::PriorityHeap} now supports efficient element removal and bulk insertion:

  - **`delete(element)`**: Remove a specific element from the heap in O(n) time
  - **`delete_if(&block)`**: Remove elements matching a condition with O(n) amortized bulk deletion
  - **`concat(elements)`**: Add multiple elements efficiently in O(n) time

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``` ruby
heap = IO::Event::PriorityHeap.new

# Efficient bulk insertion - O(n) instead of O(n log n)
heap.concat([5, 2, 8, 1, 9, 3])

# Remove specific element
removed = heap.delete(5)  # Returns 5, heap maintains order

# Bulk removal with condition
count = heap.delete_if{|x| x.even?}  # Removes 2, 8 efficiently
```

The `delete_if` and `concat` methods are particularly efficient for bulk operations, using bottom-up heapification to maintain the heap property in O(n) time. This provides significant performance improvements:

  - **Bulk insertion**: O(n log n) → O(n) for adding multiple elements
  - **Bulk deletion**: O(k×n) → O(n) for removing k elements

Both methods maintain the heap invariant and include comprehensive test coverage with edge case validation.

## v1.11.2

  - Fix Windows build.

## v1.11.1

  - Fix `read_nonblock` when using the `URing` selector, which was not handling zero-length reads correctly. This allows reading available data without blocking.

## v1.11.0

### Introduce `IO::Event::WorkerPool` for off-loading blocking operations.

The {ruby IO::Event::WorkerPool} provides a mechanism for executing blocking operations on separate OS threads while properly integrating with Ruby's fiber scheduler and GVL (Global VM Lock) management. This enables true parallelism for CPU-intensive or blocking operations that would otherwise block the event loop.

``` ruby
# Fiber scheduler integration via blocking_operation_wait hook
class MyScheduler
	def initialize
		@worker_pool = IO::Event::WorkerPool.new
	end
	
	def blocking_operation_wait(operation)
		@worker_pool.call(operation)
	end
end

# Usage with automatic offloading
Fiber.set_scheduler(MyScheduler.new)
# Automatically offload `rb_nogvl(..., RB_NOGVL_OFFLOAD_SAFE)` to a background thread:
result = some_blocking_operation()
```

The implementation uses one or more background threads and a list of pending blocking operations. Those operations either execute through to completion or may be cancelled, which executes the "unblock function" provided to `rb_nogvl`.

## v1.10.2

  - Improved consistency of handling closed IO when invoking `#select`.

## v1.10.0

  - `IO::Event::Profiler` is moved to dedicated gem: [fiber-profiler](https://github.com/socketry/fiber-profiler).
  - Perform runtime checks for native selectors to ensure they are supported in the current environment. While compile-time checks determine availability, restrictions like seccomp and SELinux may still prevent them from working.

## v1.9.0

  - Improved `IO::Event::Profiler` for detecting stalls.

## v1.8.0

  - Detecting fibers that are stalling the event loop.

## v1.7.5

  - Fix `process_wait` race condition on EPoll that could cause a hang.
