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Fix potential oversight in semaphore release logic

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This commit is contained in:
Dean Herbert 2021-11-29 18:26:37 +09:00
parent f19cfcc82e
commit 23fded4a3a
1 changed files with 17 additions and 7 deletions
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24
osu.Game/Database/RealmContextFactory.cs
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@ -153,15 +153,22 @@ namespace osu.Game.Database
if (isDisposed) if (isDisposed)
throw new ObjectDisposedException(nameof(RealmContextFactory)); throw new ObjectDisposedException(nameof(RealmContextFactory));
bool tookSemaphoreLock = false;
try try
{ {
if (!currentThreadCanCreateContexts.Value) if (!currentThreadCanCreateContexts.Value)
{
contextCreationLock.Wait(); contextCreationLock.Wait();
tookSemaphoreLock = true;
// the semaphore is used to stop all context creation. }
// once the semaphore has been taken by this code section, it is safe to create further contexts. else
// this can happen if a realm subscription is active and triggers a callback which has user code that calls `CreateContext`. {
currentThreadCanCreateContexts.Value = true; // the semaphore is used to handle blocking of all context creation during certain periods.
// once the semaphore has been taken by this code section, it is safe to create further contexts on the same thread.
// this can happen if a realm subscription is active and triggers a callback which has user code that calls `CreateContext`.
currentThreadCanCreateContexts.Value = true;
}
contexts_created.Value++; contexts_created.Value++;
@ -169,8 +176,11 @@ namespace osu.Game.Database
} }
finally finally
{ {
contextCreationLock.Release(); if (tookSemaphoreLock)
currentThreadCanCreateContexts.Value = false; {
contextCreationLock.Release();
currentThreadCanCreateContexts.Value = false;
}
} }
} }