// This source code is dual-licensed under the Mozilla Public License ("MPL"),
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// version 1.1 and the Apache License ("ASL"), version 2.0.
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//
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// The ASL v2.0:
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//
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// ---------------------------------------------------------------------------
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// Copyright 2016 Pivotal Software, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ---------------------------------------------------------------------------
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//
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// The MPL v1.1:
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//
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// ---------------------------------------------------------------------------
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// The contents of this file are subject to the Mozilla Public License
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// Version 1.1 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License at
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// https://www.mozilla.org/MPL/
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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// License for the specific language governing rights and limitations
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// under the License.
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//
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// The Original Code is RabbitMQ
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//
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// The Initial Developer of the Original Code is Pivotal Software, Inc.
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// All Rights Reserved.
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//
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// Alternatively, the contents of this file may be used under the terms
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// of the Apache Standard license (the "ASL License"), in which case the
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// provisions of the ASL License are applicable instead of those
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// above. If you wish to allow use of your version of this file only
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// under the terms of the ASL License and not to allow others to use
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// your version of this file under the MPL, indicate your decision by
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// deleting the provisions above and replace them with the notice and
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// other provisions required by the ASL License. If you do not delete
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// the provisions above, a recipient may use your version of this file
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// under either the MPL or the ASL License.
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// ---------------------------------------------------------------------------
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#import "RMQGCDSerialQueue.h"
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#import <libkern/OSAtomic.h>
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typedef NS_ENUM(int32_t, RMQGCDSerialQueueStatus) {
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RMQGCDSerialQueueStatusNormal = 1,
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RMQGCDSerialQueueStatusSuspended,
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};
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@interface RMQGCDSerialQueue ()
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@property (nonatomic, readwrite) NSString *name;
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@property (nonatomic, readwrite) dispatch_queue_t dispatchQueue;
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@property (atomic, readwrite) volatile int32_t status;
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@end
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@implementation RMQGCDSerialQueue
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- (instancetype)initWithName:(NSString *)name {
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self = [super init];
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if (self) {
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self.name = name;
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self.status = RMQGCDSerialQueueStatusNormal;
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NSString *qName = [NSString stringWithFormat:@"RMQGCDSerialQueue (%@)", name];
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self.dispatchQueue = dispatch_queue_create([qName cStringUsingEncoding:NSUTF8StringEncoding], NULL);
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}
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return self;
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}
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- (instancetype)init {
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[self doesNotRecognizeSelector:_cmd];
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return nil;
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}
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- (void)dealloc {
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[self resume];
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}
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- (void)enqueue:(RMQOperation)operation {
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dispatch_async(self.dispatchQueue, operation);
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}
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- (void)blockingEnqueue:(RMQOperation)operation {
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dispatch_sync(self.dispatchQueue, operation);
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}
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- (void)delayedBy:(NSNumber *)delay
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enqueue:(RMQOperation)operation {
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delay.doubleValue * NSEC_PER_SEC)),
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self.dispatchQueue,
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operation);
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}
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- (void)suspend {
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if (self.status == RMQGCDSerialQueueStatusSuspended) {
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return;
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}
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while (true) {
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if (OSAtomicCompareAndSwap32(self.status,
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RMQGCDSerialQueueStatusSuspended,
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&_status)) {
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dispatch_suspend(self.dispatchQueue);
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return;
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}
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}
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}
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- (void)resume {
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if (self.status == RMQGCDSerialQueueStatusNormal) {
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return;
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}
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while (true) {
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if (OSAtomicCompareAndSwap32(self.status,
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RMQGCDSerialQueueStatusNormal,
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&_status)) {
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dispatch_resume(self.dispatchQueue);
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return;
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}
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}
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}
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@end
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