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Function core.thread.osthread.thread_enterCriticalRegion

Signals that the code following this call is a critical region. Any code in this region must finish running before the calling thread can be suspended by a call to thread_suspendAll.

extern(C) void thread_enterCriticalRegion() @nogc;

This function is, in particular, meant to help maintain garbage collector invariants when a lock is not used.

A critical region is exited with thread_exitCriticalRegion.

Warning: Using critical regions is extremely error-prone. For instance, using locks inside a critical region can easily result in a deadlock when another thread holding the lock already got suspended.

The term and concept of a 'critical region' comes from Mono's SGen garbage collector.


The calling thread must be attached to the runtime.


Sean Kelly, Walter Bright, Alex Rønne Petersen, Martin Nowak


Distributed under the Boost Software License 1.0. (See accompanying file LICENSE)