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[ASTextKitRenderer] Adding locking when accessing the text renderer cache #2075

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merged 1 commit into from
Jan 25, 2023
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[ASTextKitRenderer] Adding locking when accessing the text renderer cache #2075

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2 changes: 2 additions & 0 deletions Source/ASExperimentalFeatures.h
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,8 @@ typedef NS_OPTIONS(NSUInteger, ASExperimentalFeatures) {
ASExperimentalDisableGlobalTextkitLock = 1 << 10, // exp_disable_global_textkit_lock
ASExperimentalMainThreadOnlyDataController = 1 << 11, // exp_main_thread_only_data_controller
ASExperimentalRangeUpdateOnChangesetUpdate = 1 << 12, // exp_range_update_on_changeset_update
ASExperimentalNoTextRendererCache = 1 << 13, // exp_no_text_renderer_cache
ASExperimentalLockTextRendererCache = 1 << 14, // exp_lock_text_renderer_cache
ASExperimentalFeatureAll = 0xFFFFFFFF
};

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5 changes: 4 additions & 1 deletion Source/ASExperimentalFeatures.mm
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Expand Up @@ -24,7 +24,10 @@
@"exp_optimize_data_controller_pipeline",
@"exp_disable_global_textkit_lock",
@"exp_main_thread_only_data_controller",
@"exp_range_update_on_changeset_update"]));
@"exp_range_update_on_changeset_update",
@"exp_no_text_renderer_cache",
@"exp_lock_text_renderer_cache"]));

if (flags == ASExperimentalFeatureAll) {
return allNames;
}
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19 changes: 18 additions & 1 deletion Source/ASTextNode.mm
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Expand Up @@ -115,7 +115,7 @@ - (BOOL)isEqual:(ASTextNodeRendererKey *)object
we maintain a LRU renderer cache that is queried via a unique key based on text kit attributes and constrained size.
*/

static ASTextKitRenderer *rendererForAttributes(ASTextKitAttributes attributes, CGSize constrainedSize)
static ASTextKitRenderer *_rendererForAttributes(ASTextKitAttributes attributes, CGSize constrainedSize)
{
NSCache *cache = sharedRendererCache();

Expand All @@ -130,6 +130,23 @@ - (BOOL)isEqual:(ASTextNodeRendererKey *)object
return renderer;
}

static AS::RecursiveMutex __sharedRendererCacheInstanceLock__;
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nit: should this go at the top with the other locks? Or is the thinking to clean this up if it works?

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Which other locks? Since these are static C functions I put the lock right next to them. Is there a better place to put them?

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Ignore me, I was looking at a different file 😅


static ASTextKitRenderer *rendererForAttributes(ASTextKitAttributes attributes, CGSize constrainedSize)
{
BOOL neverCache = ASActivateExperimentalFeature(ASExperimentalNoTextRendererCache);
if (neverCache) {
return [[ASTextKitRenderer alloc] initWithTextKitAttributes:attributes constrainedSize:constrainedSize];
}

BOOL lockCache = ASActivateExperimentalFeature(ASExperimentalLockTextRendererCache);
if (lockCache) {
AS::MutexLocker l(__sharedRendererCacheInstanceLock__);
return _rendererForAttributes(attributes, constrainedSize);
}
return _rendererForAttributes(attributes, constrainedSize);
}

#pragma mark - ASTextNodeDrawParameter

@interface ASTextNodeDrawParameter : NSObject {
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