| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #import "WXDisplayQueue.h" |
| |
| #define MAX_CONCURRENT_COUNT 8 |
| |
| static dispatch_semaphore_t WXDisplayConcurrentSemaphore; |
| |
| @implementation WXDisplayQueue |
| |
| + (dispatch_queue_t)displayQueue |
| { |
| static dispatch_queue_t displayQueue = NULL; |
| static dispatch_once_t onceToken; |
| dispatch_once(&onceToken, ^{ |
| displayQueue = dispatch_queue_create("com.taobao.weex.displayQueue", DISPATCH_QUEUE_CONCURRENT); |
| dispatch_set_target_queue(displayQueue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)); |
| }); |
| |
| return displayQueue; |
| } |
| |
| + (void)addBlock:(void(^)(void))block |
| { |
| static dispatch_once_t onceToken; |
| dispatch_once(&onceToken, ^{ |
| NSUInteger processorCount = [NSProcessInfo processInfo].activeProcessorCount; |
| NSUInteger maxConcurrentCount = processorCount <= MAX_CONCURRENT_COUNT ? processorCount : MAX_CONCURRENT_COUNT; |
| WXDisplayConcurrentSemaphore = dispatch_semaphore_create(maxConcurrentCount); |
| }); |
| |
| dispatch_async([self displayQueue], ^{ |
| dispatch_semaphore_wait(WXDisplayConcurrentSemaphore, DISPATCH_TIME_FOREVER); |
| block(); |
| dispatch_semaphore_signal(WXDisplayConcurrentSemaphore); |
| }); |
| } |
| |
| @end |