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//
// GTMNSThread+Blocks.m
//
// Copyright 2012 Google Inc.
//
// Licensed 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 "GTMNSThread+Blocks.h"
#import <pthread.h>
#import <dlfcn.h>
#if NS_BLOCKS_AVAILABLE
@implementation NSThread (GTMBlocksAdditions)
+ (void)gtm_runBlockOnCurrentThread:(void (^)(void))block {
block();
}
- (void)gtm_performBlock:(void (^)(void))block {
if ([[NSThread currentThread] isEqual:self]) {
block();
} else {
[self gtm_performWaitingUntilDone:NO block:block];
}
}
- (void)gtm_performWaitingUntilDone:(BOOL)waitDone block:(void (^)(void))block {
[NSThread performSelector:@selector(gtm_runBlockOnCurrentThread:)
onThread:self
withObject:[[block copy] autorelease]
waitUntilDone:waitDone];
}
+ (void)gtm_performBlockInBackground:(void (^)(void))block {
[NSThread performSelectorInBackground:@selector(gtm_runBlockOnCurrentThread:)
withObject:[[block copy] autorelease]];
}
@end
#endif // NS_BLOCKS_AVAILABLE
@implementation GTMSimpleWorkerThread {
NSLock *sourceLock_;
CFRunLoopSourceRef source_; // Protected by sourceLock_
CFRunLoopRef cfRunLoop_;
}
static void RunLoopContextEmptyFunc(void *info) {
// Empty because the source is used solely for signalling.
// The documentation for CFRunLoopSourceContext does not
// make it clear if you can have a null perform method.
}
- (void)main {
NSRunLoop *nsRunLoop = [NSRunLoop currentRunLoop];
{ // Braces are just to denote what is protected by sourceLock_
[sourceLock_ lock];
cfRunLoop_ = [nsRunLoop getCFRunLoop];
CFRetain(cfRunLoop_);
CFRunLoopSourceContext context = {0};
context.perform = RunLoopContextEmptyFunc;
source_ = CFRunLoopSourceCreate(NULL, 0, &context);
CFRunLoopAddSource(cfRunLoop_, source_, kCFRunLoopCommonModes);
[sourceLock_ unlock];
}
while (true) {
BOOL cancelled = [self isCancelled];
if (cancelled) {
break;
}
BOOL ranLoop = [nsRunLoop runMode:NSDefaultRunLoopMode
beforeDate:[NSDate distantFuture]];
if (!ranLoop) {
break;
}
}
}
- (void)dealloc {
if (cfRunLoop_) {
CFRelease(cfRunLoop_);
}
if (source_) {
CFRelease(source_);
}
[super dealloc];
}
- (void)start {
// Protect lock in case we are "started" twice in different threads.
// NSThread has no documentation regarding the safety of this, so
// making safe by default.
@synchronized (self) {
if (sourceLock_) {
return;
}
sourceLock_ = [[NSLock alloc] init];
}
[super start];
}
- (void)cancel {
[super cancel];
{ // Braces are just to denote what is protected by sourceLock_
[sourceLock_ lock];
if (source_) {
CFRunLoopSourceSignal(source_);
CFRunLoopWakeUp(cfRunLoop_);
}
[sourceLock_ unlock];
}
}
@end
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