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Bug 1856087 - Bypass assertion if NS_DISPATCH_IGNORE_BLOCK_DISPATCH is set, r=xpcom-reviewers,jstutte

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The `gXPCOMThreadsShutDownNotified` assertion exists to discourage
dispatching to a background thread after xpcom-shutdown-threads. This
unfortunately poorly interacts with the nsThreadPool implementation. We
use nsThreadPools all of the way until threads are fully shut down
during ShutdownNonMainThreads, and they dispatch a runnable to a
background thread when starting a new thread.

This patch disables the assertion when NS_DISPATCH_IGNORE_BLOCK_DISPATCH
is specified. This flag already effectively indicates "trust me I am
dispatching to a thread which is in a weird state, this dispatch must
succeed", so seems appropriate to use in this situation, and will avoid
the underlying issue.

The nsThreadPool runnable is already dispatched with this flag set.

Differential Revision: https://phabricator.services.mozilla.com/D190303
This commit is contained in:
Nika Layzell 2023-10-06 20:57:58 +00:00
parent 51c68d3e2a
commit 04650d926f
1 changed files with 2 additions and 1 deletions
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3
xpcom/threads/ThreadEventTarget.cpp
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@ -73,7 +73,8 @@ ThreadEventTarget::Dispatch(already_AddRefed<nsIRunnable> aEvent,
}
NS_ASSERTION(!gXPCOMThreadsShutDownNotified || mIsMainThread ||
PR_GetCurrentThread() == mThread,
PR_GetCurrentThread() == mThread ||
(aFlags & NS_DISPATCH_IGNORE_BLOCK_DISPATCH),
"Dispatch to non-main thread after xpcom-shutdown-threads");
if (mBlockDispatch && !(aFlags & NS_DISPATCH_IGNORE_BLOCK_DISPATCH)) {