80 lines
2.1 KiB
PHP
80 lines
2.1 KiB
PHP
<?php
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namespace React\Async;
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use React\EventLoop\Loop;
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/**
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* @internal
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*/
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final class SimpleFiber implements FiberInterface
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{
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/** @var ?\Fiber<void,void,void,callable(): mixed> */
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private static ?\Fiber $scheduler = null;
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private static ?\Closure $suspend = null;
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/** @var ?\Fiber<mixed,mixed,mixed,mixed> */
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private ?\Fiber $fiber = null;
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public function __construct()
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{
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$this->fiber = \Fiber::getCurrent();
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}
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public function resume(mixed $value): void
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{
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if ($this->fiber !== null) {
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$this->fiber->resume($value);
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} else {
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self::$suspend = static fn() => $value;
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}
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if (self::$suspend !== null && \Fiber::getCurrent() === self::$scheduler) {
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$suspend = self::$suspend;
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self::$suspend = null;
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\Fiber::suspend($suspend);
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}
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}
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public function throw(\Throwable $throwable): void
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{
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if ($this->fiber !== null) {
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$this->fiber->throw($throwable);
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} else {
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self::$suspend = static fn() => throw $throwable;
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}
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if (self::$suspend !== null && \Fiber::getCurrent() === self::$scheduler) {
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$suspend = self::$suspend;
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self::$suspend = null;
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\Fiber::suspend($suspend);
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}
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}
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public function suspend(): mixed
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{
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if ($this->fiber === null) {
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if (self::$scheduler === null || self::$scheduler->isTerminated()) {
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self::$scheduler = new \Fiber(static fn() => Loop::run());
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// Run event loop to completion on shutdown.
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\register_shutdown_function(static function (): void {
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assert(self::$scheduler instanceof \Fiber);
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if (self::$scheduler->isSuspended()) {
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self::$scheduler->resume();
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}
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});
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}
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$ret = (self::$scheduler->isStarted() ? self::$scheduler->resume() : self::$scheduler->start());
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assert(\is_callable($ret));
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return $ret();
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}
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return \Fiber::suspend();
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}
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}
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