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ASThread: Remove Locker, Unlocker, and SharedMutex (#1213)

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* ASThread: Remove Locker, Unlocker, and SharedMutex

* Remove extra line

* Kick the CI

* Move C++ down

* Fix thing
This commit is contained in:
Adlai Holler
2018-11-05 13:26:36 -08:00
committed by GitHub
parent 5909e27e37
commit 5c9815f46d
9 changed files with 77 additions and 206 deletions
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73
Source/ASDisplayNode.mm
View File

@@ -416,12 +416,13 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
- (void)onDidLoad:(ASDisplayNodeDidLoadBlock)body
{
ASDN::MutexLocker l(__instanceLock__);
ASDN::UniqueLock l(__instanceLock__);
if ([self _locked_isNodeLoaded]) {
ASDisplayNodeAssertThreadAffinity(self);
ASDN::MutexUnlocker l(__instanceLock__);
l.unlock();
body(self);
return;
} else if (_onDidLoadBlocks == nil) {
_onDidLoadBlocks = [NSMutableArray arrayWithObject:body];
} else {
@@ -601,7 +602,7 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
- (UIView *)view
{
ASDN::MutexLocker l(__instanceLock__);
ASDN::UniqueLock l(__instanceLock__);
ASDisplayNodeAssert(!_flags.layerBacked, @"Call to -view undefined on layer-backed nodes");
BOOL isLayerBacked = _flags.layerBacked;
@@ -626,30 +627,28 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
// in the background on a loaded node, which isn't currently supported.
if (_pendingViewState.hasSetNeedsLayout) {
// Need to unlock before calling setNeedsLayout to avoid deadlocks.
// MutexUnlocker will re-lock at the end of scope.
ASDN::MutexUnlocker u(__instanceLock__);
l.unlock();
[self __setNeedsLayout];
l.lock();
}
[self _locked_applyPendingStateToViewOrLayer];
{
// The following methods should not be called with a lock
ASDN::MutexUnlocker u(__instanceLock__);
// The following methods should not be called with a lock
l.unlock();
// No need for the lock as accessing the subviews or layers are always happening on main
[self _addSubnodeViewsAndLayers];
// A subclass hook should never be called with a lock
[self _didLoad];
}
// No need for the lock as accessing the subviews or layers are always happening on main
[self _addSubnodeViewsAndLayers];
// A subclass hook should never be called with a lock
[self _didLoad];
return _view;
}
- (CALayer *)layer
{
ASDN::MutexLocker l(__instanceLock__);
ASDN::UniqueLock l(__instanceLock__);
if (_layer != nil) {
return _layer;
}
@@ -661,31 +660,30 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
// Loading a layer needs to happen on the main thread
ASDisplayNodeAssertMainThread();
[self _locked_loadViewOrLayer];
CALayer *layer = _layer;
// FIXME: Ideally we'd call this as soon as the node receives -setNeedsLayout
// but automatic subnode management would require us to modify the node tree
// in the background on a loaded node, which isn't currently supported.
if (_pendingViewState.hasSetNeedsLayout) {
// Need to unlock before calling setNeedsLayout to avoid deadlocks.
// MutexUnlocker will re-lock at the end of scope.
ASDN::MutexUnlocker u(__instanceLock__);
l.unlock();
[self __setNeedsLayout];
l.lock();
}
[self _locked_applyPendingStateToViewOrLayer];
{
// The following methods should not be called with a lock
ASDN::MutexUnlocker u(__instanceLock__);
// The following methods should not be called with a lock
l.unlock();
// No need for the lock as accessing the subviews or layers are always happening on main
[self _addSubnodeViewsAndLayers];
// A subclass hook should never be called with a lock
[self _didLoad];
}
// No need for the lock as accessing the subviews or layers are always happening on main
[self _addSubnodeViewsAndLayers];
// A subclass hook should never be called with a lock
[self _didLoad];
return _layer;
return layer;
}
// Returns nil if the layer is not an _ASDisplayLayer; will not create the layer if nil.
@@ -1033,7 +1031,7 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
BOOL loaded = NO;
{
ASDN::MutexLocker l(__instanceLock__);
ASDN::UniqueLock l(__instanceLock__);
loaded = [self _locked_isNodeLoaded];
CGRect bounds = _threadSafeBounds;
@@ -1055,10 +1053,9 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
// This method will confirm that the layout is up to date (and update if needed).
// Importantly, it will also APPLY the layout to all of our subnodes if (unless parent is transitioning).
{
ASDN::MutexUnlocker u(__instanceLock__);
[self _u_measureNodeWithBoundsIfNecessary:bounds];
}
l.unlock();
[self _u_measureNodeWithBoundsIfNecessary:bounds];
l.lock();
[self _locked_layoutPlaceholderIfNecessary];
}
@@ -1121,7 +1118,7 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
{
__ASDisplayNodeCheckForLayoutMethodOverrides;
ASDN::MutexLocker l(__instanceLock__);
ASDN::UniqueLock l(__instanceLock__);
#if YOGA
// There are several cases where Yoga could arrive here:
@@ -1138,11 +1135,13 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
if ([self shouldHaveYogaMeasureFunc] == NO) {
// If we're a yoga root, tree node, or leaf with no measure func (e.g. spacer), then
// initiate a new Yoga calculation pass from root.
ASDN::MutexUnlocker ul(__instanceLock__);
as_activity_create_for_scope("Yoga layout calculation");
if (self.yogaLayoutInProgress == NO) {
ASYogaLog("Calculating yoga layout from root %@, %@", self, NSStringFromASSizeRange(constrainedSize));
l.unlock();
[self calculateLayoutFromYogaRoot:constrainedSize];
l.lock();
} else {
ASYogaLog("Reusing existing yoga layout %@", _yogaCalculatedLayout);
}
@@ -3546,15 +3545,15 @@ ASDISPLAYNODE_INLINE BOOL subtreeIsRasterized(ASDisplayNode *node) {
ASDisplayNodeAssertMainThread();
ASAssertUnlocked(__instanceLock__);
ASDN::MutexLocker l(__instanceLock__);
ASDN::UniqueLock l(__instanceLock__);
// FIXME: Ideally we'd call this as soon as the node receives -setNeedsLayout
// but automatic subnode management would require us to modify the node tree
// in the background on a loaded node, which isn't currently supported.
if (_pendingViewState.hasSetNeedsLayout) {
// Need to unlock before calling setNeedsLayout to avoid deadlocks.
// MutexUnlocker will re-lock at the end of scope.
ASDN::MutexUnlocker u(__instanceLock__);
l.unlock();
[self __setNeedsLayout];
l.lock();
}
[self _locked_applyPendingViewState];

6
Source/ASImageNode.mm
View File

@@ -434,12 +434,12 @@ typedef void (^ASImageNodeDrawParametersBlock)(ASWeakMapEntry *entry);
static ASWeakMap<ASImageNodeContentsKey *, UIImage *> *cache = nil;
// Allocate cacheLock on the heap to prevent destruction at app exit (https://github.com/TextureGroup/Texture/issues/136)
static ASDN::StaticMutex& cacheLock = *new ASDN::StaticMutex;
static auto *cacheLock = new ASDN::Mutex;
+ (ASWeakMapEntry *)contentsForkey:(ASImageNodeContentsKey *)key drawParameters:(id)drawParameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled
{
{
ASDN::StaticMutexLocker l(cacheLock);
ASDN::MutexLocker l(*cacheLock);
if (!cache) {
cache = [[ASWeakMap alloc] init];
}
@@ -456,7 +456,7 @@ static ASDN::StaticMutex& cacheLock = *new ASDN::StaticMutex;
}
{
ASDN::StaticMutexLocker l(cacheLock);
ASDN::MutexLocker l(*cacheLock);
return [cache setObject:contents forKey:key];
}
}

6
Source/ASTextNode2.mm
View File

@@ -55,14 +55,14 @@
*/
static NS_RETURNS_RETAINED ASTextLayout *ASTextNodeCompatibleLayoutWithContainerAndText(ASTextContainer *container, NSAttributedString *text) {
// Allocate layoutCacheLock on the heap to prevent destruction at app exit (https://github.com/TextureGroup/Texture/issues/136)
static ASDN::StaticMutex& layoutCacheLock = *new ASDN::StaticMutex;
static auto *layoutCacheLock = new ASDN::Mutex;
static NSCache<NSAttributedString *, ASTextCacheValue *> *textLayoutCache;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
textLayoutCache = [[NSCache alloc] init];
});
layoutCacheLock.lock();
layoutCacheLock->lock();
ASTextCacheValue *cacheValue = [textLayoutCache objectForKey:text];
if (cacheValue == nil) {
@@ -72,7 +72,7 @@ static NS_RETURNS_RETAINED ASTextLayout *ASTextNodeCompatibleLayoutWithContainer
// Lock the cache item for the rest of the method. Only after acquiring can we release the NSCache.
ASDN::MutexLocker lock(cacheValue->_m);
layoutCacheLock.unlock();
layoutCacheLock->unlock();
CGRect containerBounds = (CGRect){ .size = container.size };
{

12
Source/ASVideoNode.mm
View File

@@ -10,6 +10,7 @@
#import <AVFoundation/AVFoundation.h>
#import <AsyncDisplayKit/ASDisplayNode+FrameworkPrivate.h>
#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
#import <AsyncDisplayKit/ASDisplayNodeInternal.h>
#import <AsyncDisplayKit/ASVideoNode.h>
#import <AsyncDisplayKit/ASEqualityHelpers.h>
#import <AsyncDisplayKit/ASInternalHelpers.h>
@@ -322,7 +323,7 @@ static NSString * const kRate = @"rate";
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
ASLockScopeSelf();
ASDN::UniqueLock l(__instanceLock__);
if (object == _currentPlayerItem) {
if ([keyPath isEqualToString:kStatus]) {
@@ -330,8 +331,9 @@ static NSString * const kRate = @"rate";
if (self.playerState != ASVideoNodePlayerStatePlaying) {
self.playerState = ASVideoNodePlayerStateReadyToPlay;
if (_shouldBePlaying && ASInterfaceStateIncludesVisible(self.interfaceState)) {
ASUnlockScope(self);
l.unlock();
[self play];
l.lock();
}
}
// If we don't yet have a placeholder image update it now that we should have data available for it
@@ -354,8 +356,10 @@ static NSString * const kRate = @"rate";
[self.delegate videoNodeDidRecoverFromStall:self];
}
ASUnlockScope(self);
l.unlock();
[self play]; // autoresume after buffer catches up
// NOTE: Early return without re-locking.
return;
}
} else if ([keyPath isEqualToString:kplaybackBufferEmpty]) {
if (_shouldBePlaying && [change[NSKeyValueChangeNewKey] boolValue] == YES && ASInterfaceStateIncludesVisible(self.interfaceState)) {
@@ -373,6 +377,8 @@ static NSString * const kRate = @"rate";
}
}
}
// NOTE: Early return above.
}
- (void)tapped

6
Source/Details/ASBasicImageDownloader.mm
View File

@@ -39,11 +39,11 @@ NSString * const kASBasicImageDownloaderContextCompletionBlock = @"kASBasicImage
static NSMutableDictionary *currentRequests = nil;
// Allocate currentRequestsLock on the heap to prevent destruction at app exit (https://github.com/TextureGroup/Texture/issues/136)
static ASDN::StaticMutex& currentRequestsLock = *new ASDN::StaticMutex;
static auto *currentRequestsLock = new ASDN::Mutex;
+ (ASBasicImageDownloaderContext *)contextForURL:(NSURL *)URL
{
ASDN::StaticMutexLocker l(currentRequestsLock);
ASDN::MutexLocker l(*currentRequestsLock);
if (!currentRequests) {
currentRequests = [[NSMutableDictionary alloc] init];
}
@@ -57,7 +57,7 @@ static ASDN::StaticMutex& currentRequestsLock = *new ASDN::StaticMutex;
+ (void)cancelContextWithURL:(NSURL *)URL
{
ASDN::StaticMutexLocker l(currentRequestsLock);
ASDN::MutexLocker l(*currentRequestsLock);
if (currentRequests) {
[currentRequests removeObjectForKey:URL];
}

11
Source/Details/ASMainSerialQueue.mm
View File

@@ -40,19 +40,21 @@
- (void)performBlockOnMainThread:(dispatch_block_t)block
{
ASDN::MutexLocker l(_serialQueueLock);
ASDN::UniqueLock l(_serialQueueLock);
[_blocks addObject:block];
{
ASDN::MutexUnlocker u(_serialQueueLock);
l.unlock();
[self runBlocks];
l.lock();
}
}
- (void)runBlocks
{
dispatch_block_t mainThread = ^{
ASDN::UniqueLock l(self->_serialQueueLock);
do {
ASDN::MutexLocker l(self->_serialQueueLock);
dispatch_block_t block;
if (self->_blocks.count > 0) {
block = _blocks[0];
@@ -61,8 +63,9 @@
break;
}
{
ASDN::MutexUnlocker u(self->_serialQueueLock);
l.unlock();
block();
l.lock();
}
} while (true);
};

143
Source/Details/ASThread.h
View File

@@ -95,7 +95,6 @@ ASDISPLAYNODE_INLINE void _ASUnlockScopeCleanup(id<NSLocking> __strong *lockPtr)
#ifdef __cplusplus
#define TIME_LOCKER 0
/**
* Enable this flag to collect information on the owning thread and ownership level of a mutex.
* These properties are useful to determine if a mutex has been acquired and in case of a recursive mutex, how many times that happened.
@@ -112,11 +111,8 @@ ASDISPLAYNODE_INLINE void _ASUnlockScopeCleanup(id<NSLocking> __strong *lockPtr)
#define CHECK_LOCKING_SAFETY 0
#endif
#if TIME_LOCKER
#import <QuartzCore/QuartzCore.h>
#endif
#include <memory>
#include <mutex>
// This MUST always execute, even when assertions are disabled. Otherwise all lock operations become no-ops!
// (To be explicit, do not turn this into an NSAssert, assert(), or any other kind of statement where the
@@ -143,106 +139,6 @@ ASDISPLAYNODE_INLINE void _ASUnlockScopeCleanup(id<NSLocking> __strong *lockPtr)
namespace ASDN {
template<class T>
class Locker
{
T &_l;
#if TIME_LOCKER
CFTimeInterval _ti;
const char *_name;
#endif
public:
#if !TIME_LOCKER
Locker (T &l) noexcept : _l (l) {
_l.lock ();
}
~Locker () {
_l.unlock ();
}
// non-copyable.
Locker(const Locker<T>&) = delete;
Locker &operator=(const Locker<T>&) = delete;
#else
Locker (T &l, const char *name = NULL) noexcept : _l (l), _name(name) {
_ti = CACurrentMediaTime();
_l.lock ();
}
~Locker () {
_l.unlock ();
if (_name) {
printf(_name, NULL);
printf(" dt:%f\n", CACurrentMediaTime() - _ti);
}
}
#endif
};
template<class T>
class SharedLocker
{
std::shared_ptr<T> _l;
#if TIME_LOCKER
CFTimeInterval _ti;
const char *_name;
#endif
public:
#if !TIME_LOCKER
SharedLocker (std::shared_ptr<T> const& l) noexcept : _l (l) {
ASDisplayNodeCAssertTrue(_l != nullptr);
_l->lock ();
}
~SharedLocker () {
_l->unlock ();
}
// non-copyable.
SharedLocker(const SharedLocker<T>&) = delete;
SharedLocker &operator=(const SharedLocker<T>&) = delete;
#else
SharedLocker (std::shared_ptr<T> const& l, const char *name = NULL) noexcept : _l (l), _name(name) {
_ti = CACurrentMediaTime();
_l->lock ();
}
~SharedLocker () {
_l->unlock ();
if (_name) {
printf(_name, NULL);
printf(" dt:%f\n", CACurrentMediaTime() - _ti);
}
}
#endif
};
template<class T>
class Unlocker
{
T &_l;
public:
Unlocker (T &l) noexcept : _l (l) { _l.unlock (); }
~Unlocker () {_l.lock ();}
Unlocker(Unlocker<T>&) = delete;
Unlocker &operator=(Unlocker<T>&) = delete;
};
// Set once in Mutex constructor. Linker fails if this is a member variable. ??
static BOOL gMutex_unfair;
@@ -414,41 +310,8 @@ namespace ASDN {
RecursiveMutex () : Mutex (true) {}
};
typedef Locker<Mutex> MutexLocker;
typedef SharedLocker<Mutex> MutexSharedLocker;
typedef Unlocker<Mutex> MutexUnlocker;
/**
If you are creating a static mutex, use StaticMutex. This avoids expensive constructor overhead at startup (or worse, ordering
issues between different static objects). It also avoids running a destructor on app exit time (needless expense).
Note that you can, but should not, use StaticMutex for non-static objects. It will leak its mutex on destruction,
so avoid that!
*/
struct StaticMutex
{
StaticMutex () : _m (PTHREAD_MUTEX_INITIALIZER) {}
// non-copyable.
StaticMutex(const StaticMutex&) = delete;
StaticMutex &operator=(const StaticMutex&) = delete;
void lock () {
AS_POSIX_ASSERT_NOERR(pthread_mutex_lock (this->mutex()));
}
void unlock () {
AS_POSIX_ASSERT_NOERR(pthread_mutex_unlock (this->mutex()));
}
pthread_mutex_t *mutex () { return &_m; }
private:
pthread_mutex_t _m;
};
typedef Locker<StaticMutex> StaticMutexLocker;
typedef Unlocker<StaticMutex> StaticMutexUnlocker;
typedef std::lock_guard<Mutex> MutexLocker;
typedef std::unique_lock<Mutex> UniqueLock;
} // namespace ASDN

18
Source/Private/ASLayoutTransition.mm
View File

@@ -81,7 +81,7 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
- (BOOL)isSynchronous
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
return !ASLayoutCanTransitionAsynchronous(_pendingLayout.layout);
}
@@ -93,7 +93,7 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
- (void)applySubnodeInsertionsAndMoves
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
[self calculateSubnodeOperationsIfNeeded];
// Create an activity even if no subnodes affected.
@@ -131,7 +131,7 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
- (void)applySubnodeRemovals
{
as_activity_scope(as_activity_create("Apply subnode removals", AS_ACTIVITY_CURRENT, OS_ACTIVITY_FLAG_DEFAULT));
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
[self calculateSubnodeOperationsIfNeeded];
if (_removedSubnodes.count == 0) {
@@ -151,7 +151,7 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
- (void)calculateSubnodeOperationsIfNeeded
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
if (_calculatedSubnodeOperations) {
return;
}
@@ -206,27 +206,27 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
- (NSArray<ASDisplayNode *> *)currentSubnodesWithTransitionContext:(_ASTransitionContext *)context
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
return _node.subnodes;
}
- (NSArray<ASDisplayNode *> *)insertedSubnodesWithTransitionContext:(_ASTransitionContext *)context
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
[self calculateSubnodeOperationsIfNeeded];
return _insertedSubnodes;
}
- (NSArray<ASDisplayNode *> *)removedSubnodesWithTransitionContext:(_ASTransitionContext *)context
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
[self calculateSubnodeOperationsIfNeeded];
return _removedSubnodes;
}
- (ASLayout *)transitionContext:(_ASTransitionContext *)context layoutForKey:(NSString *)key
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
if ([key isEqualToString:ASTransitionContextFromLayoutKey]) {
return _previousLayout.layout;
} else if ([key isEqualToString:ASTransitionContextToLayoutKey]) {
@@ -238,7 +238,7 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
- (ASSizeRange)transitionContext:(_ASTransitionContext *)context constrainedSizeForKey:(NSString *)key
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
if ([key isEqualToString:ASTransitionContextFromLayoutKey]) {
return _previousLayout.constrainedSize;
} else if ([key isEqualToString:ASTransitionContextToLayoutKey]) {

8
Source/TextKit/ASTextKitContext.mm
View File

@@ -32,9 +32,9 @@
{
if (self = [super init]) {
// Concurrently initialising TextKit components crashes (rdar://18448377) so we use a global lock.
// Allocate __staticMutex on the heap to prevent destruction at app exit (https://github.com/TextureGroup/Texture/issues/136)
static ASDN::StaticMutex& __staticMutex = *new ASDN::StaticMutex;
ASDN::StaticMutexLocker l(__staticMutex);
// Allocate mutex on the heap to prevent destruction at app exit (https://github.com/TextureGroup/Texture/issues/136)
static auto *mutex = new ASDN::Mutex;
ASDN::MutexLocker l(*mutex);
__instanceLock__ = std::make_shared<ASDN::Mutex>();
@@ -66,7 +66,7 @@
NSTextStorage *,
NSTextContainer *))block
{
ASDN::MutexSharedLocker l(__instanceLock__);
ASDN::MutexLocker l(*__instanceLock__);
if (block) {
block(_layoutManager, _textStorage, _textContainer);
}