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Use calloc’d array for subarray of contexts

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This commit is contained in:
Michael Schneider
2016-05-13 21:38:25 +02:00
parent 7d902d98c9
commit 33b76bbce0
1 changed files with 15 additions and 11 deletions
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24
AsyncDisplayKit/Details/ASDataController.mm
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@@ -191,28 +191,32 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
for (NSUInteger j = 0; j < nodeCount; j += kASDataControllerSizingCountPerProcessor) {
NSInteger batchCount = MIN(kASDataControllerSizingCountPerProcessor, nodeCount - j);
// Get subcontexts for the range of nodes that will be allocated
NSArray *subcontexts = [contexts subarrayWithRange:NSMakeRange(j, batchCount)];
// Allocate nodes concurrently.
__block NSArray *subarray;
__block NSArray *subarrayOfContexts;
__block NSArray *subarrayOfNodes;
dispatch_block_t allocationBlock = ^{
__strong ASIndexedNodeContext **allocatedContextBuffer = (__strong ASIndexedNodeContext **)calloc(batchCount, sizeof(ASIndexedNodeContext *));
__strong ASCellNode **allocatedNodeBuffer = (__strong ASCellNode **)calloc(batchCount, sizeof(ASCellNode *));
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_apply(batchCount, queue, ^(size_t i) {
ASCellNode *node = [subcontexts[i] allocateNode];
unsigned long k = j + i;
ASIndexedNodeContext *context = contexts[k];
ASCellNode *node = [context allocateNode];
if (node == nil) {
ASDisplayNodeAssertNotNil(node, @"Node block created nil node; %@, %@", self, self.dataSource);
node = [[ASCellNode alloc] init]; // Fallback to avoid crash for production apps.
}
allocatedNodeBuffer[i] = node;
allocatedContextBuffer[i] = context;
});
subarray = [[NSArray alloc] initWithObjects:allocatedNodeBuffer count:batchCount];
subarrayOfNodes = [[NSArray alloc] initWithObjects:allocatedNodeBuffer count:batchCount];
subarrayOfContexts = [NSArray arrayWithObjects:allocatedContextBuffer count:batchCount];
// Nil out buffer indexes to allow arc to free the stored cells.
for (int i = 0; i < batchCount; i++) {
allocatedContextBuffer[i] = nil;
allocatedNodeBuffer[i] = nil;
}
free(allocatedContextBuffer);
free(allocatedNodeBuffer);
};
@@ -227,15 +231,15 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
});
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
[self _layoutNodes:subarray fromContexts:subcontexts atIndexesOfRange:batchRange ofKind:kind];
[self _layoutNodes:subarrayOfNodes fromContexts:subarrayOfContexts atIndexesOfRange:batchRange ofKind:kind];
} else {
allocationBlock();
[_mainSerialQueue performBlockOnMainThread:^{
[self _layoutNodes:subarray fromContexts:subcontexts atIndexesOfRange:batchRange ofKind:kind];
[self _layoutNodes:subarrayOfNodes fromContexts:subarrayOfContexts atIndexesOfRange:batchRange ofKind:kind];
}];
}
[allocatedNodes addObjectsFromArray:subarray];
[allocatedNodes addObjectsFromArray:subarrayOfNodes];
dispatch_group_async(layoutGroup, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// We should already have measured loaded nodes before we left the main thread. Layout the remaining ones on a background thread.