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Fix inefficient interop in OSX FileSystemWatcher (#34715) 

* Fix inefficient interop in OSX FileSystemWatcher

Avoid unnecessary array allocations in the FileSystemWatcher callback

* Add using for FSEventStreamEventFlags
This commit is contained in:
Jan Kotas 2019-01-21 05:55:09 -08:00 коммит произвёл Alexis Christoforides
Родитель 1bb45140c3
Коммит 6b1b305bc2
2 изменённых файлов: 18 добавлений и 24 удалений
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6
src/Common/src/Interop/OSX/Interop.EventStream.cs
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@ -88,10 +88,8 @@ internal static partial class Interop
size_t numEvents,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)]
byte** eventPaths,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)]
FSEventStreamEventFlags[] eventFlags,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)]
FSEventStreamEventId[] eventIds);
FSEventStreamEventFlags* eventFlags,
FSEventStreamEventId* eventIds);
/// <summary>
/// Internal wrapper to create a new EventStream to listen to events from the core OS (such as File System events).

36
src/System.IO.FileSystem.Watcher/src/System/IO/FileSystemWatcher.OSX.cs
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@ -96,9 +96,9 @@ namespace System.IO
// Always re-create the filter flags when start is called since they could have changed
if ((flagsToTranslate & (NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Size)) != 0)
{
flags = FSEventStreamEventFlags.kFSEventStreamEventFlagItemInodeMetaMod |
flags = FSEventStreamEventFlags.kFSEventStreamEventFlagItemInodeMetaMod |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemFinderInfoMod |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemModified |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemModified |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemChangeOwner;
}
if ((flagsToTranslate & NotifyFilters.Security) != 0)
@ -366,13 +366,9 @@ namespace System.IO
IntPtr clientCallBackInfo,
size_t numEvents,
byte** eventPaths,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)]
Interop.EventStream.FSEventStreamEventFlags[] eventFlags,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)]
FSEventStreamEventId[] eventIds)
FSEventStreamEventFlags* eventFlags,
FSEventStreamEventId* eventIds)
{
Debug.Assert((eventPaths != null) && (numEvents.ToInt32() == eventFlags.Length) && (numEvents.ToInt32() == eventIds.Length));
// Try to get the actual watcher from our weak reference. We maintain a weak reference most of the time
// so as to avoid a rooted cycle that would prevent our processing loop from ever ending
// if the watcher is dropped by the user without being disposed. If we can't get the watcher,
@ -549,13 +545,13 @@ namespace System.IO
/// Compares the given event flags to the filter flags and returns which event (if any) corresponds
/// to those flags.
/// </summary>
private WatcherChangeTypes FilterEvents(Interop.EventStream.FSEventStreamEventFlags eventFlags)
private WatcherChangeTypes FilterEvents(FSEventStreamEventFlags eventFlags)
{
const Interop.EventStream.FSEventStreamEventFlags changedFlags = Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemInodeMetaMod |
Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemFinderInfoMod |
Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemModified |
Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemChangeOwner |
Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemXattrMod;
const FSEventStreamEventFlags changedFlags = FSEventStreamEventFlags.kFSEventStreamEventFlagItemInodeMetaMod |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemFinderInfoMod |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemModified |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemChangeOwner |
FSEventStreamEventFlags.kFSEventStreamEventFlagItemXattrMod;
WatcherChangeTypes eventType = 0;
// If any of the Changed flags are set in both Filter and Event then a Changed event has occurred.
if (((_filterFlags & changedFlags) & (eventFlags & changedFlags)) > 0)
@ -564,12 +560,12 @@ namespace System.IO
}
// Notify created/deleted/renamed events if they pass through the filters
bool allowDirs = (_filterFlags & Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsDir) > 0;
bool allowFiles = (_filterFlags & Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsFile) > 0;
bool isDir = (eventFlags & Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsDir) > 0;
bool isFile = (eventFlags & Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsFile) > 0;
bool allowDirs = (_filterFlags & FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsDir) > 0;
bool allowFiles = (_filterFlags & FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsFile) > 0;
bool isDir = (eventFlags & FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsDir) > 0;
bool isFile = (eventFlags & FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsFile) > 0;
bool eventIsCorrectType = (isDir && allowDirs) || (isFile && allowFiles);
bool eventIsLink = (eventFlags & (Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsHardlink | Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsSymlink | Interop.EventStream.FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsLastHardlink)) > 0;
bool eventIsLink = (eventFlags & (FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsHardlink | FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsSymlink | FSEventStreamEventFlags.kFSEventStreamEventFlagItemIsLastHardlink)) > 0;
if (eventIsCorrectType || ((allowDirs || allowFiles) && (eventIsLink)))
{
@ -590,7 +586,7 @@ namespace System.IO
return eventType;
}
private bool ShouldRescanOccur(Interop.EventStream.FSEventStreamEventFlags flags)
private bool ShouldRescanOccur(FSEventStreamEventFlags flags)
{
// Check if any bit is set that signals that the caller should rescan
return (flags.HasFlag(FSEventStreamEventFlags.kFSEventStreamEventFlagMustScanSubDirs) ||