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[Excimer](https://www.mediawiki.org/wiki/Excimer) is an extension for PHP which provides flexible userspace timers. This library provides a global request timeout concept, ideally using Excimer, but with a fallback to set_time_limit() if Excimer is not available. Typical usage: ``` use Wikimedia\RequestTimeout\RequestTimeout; RequestTimeout::singleton()->setWallTimeLimit( 20 ); ``` This sets a timer for 20 seconds of wall clock time. When it expires, a TimeoutException will be thrown. It is possible to query the amount of time remaining: ``` if ( RequestTimeout::singleton()->getWallTimeRemaining() > 5 ) { do_slow_thing(); } else { do_fast_thing(); } ``` This works in the fallback mode. The library provides a critical section concept. If a critical section is active, timeouts will be queued, rather than immediately thrown. The timeout exception will be thrown once no critical section is open. ``` $csp = RequestTimeout::singleton()->createCriticalSectionProvider( 5 ); $csp->enter( __METHOD__ ); try { do_something(); } finally { $csp->exit( __METHOD__ ); } ``` It is important to always exit a critical section. If the code in the critical section can throw an error, try/finally can be used to ensure that the critical section is exited. Alternatively we provide a scope variable model: ``` function foo() { $scope = $csp->scopedEnter( __METHOD__ ); do_something(); } ``` The critical section exits when the scope object is destroyed. However, with this method, it is important to not terminate the request during the critical section, for example by calling `exit()`, or by keeping the scope object in global variable after the function returns. The library may throw an exception from a destructor during request shutdown, which causes a PHP fatal error. Critical sections are not functional in the fallback mode.

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