diff options
| author | TSR Berry <20988865+TSRBerry@users.noreply.github.com> | 2023-04-08 01:22:00 +0200 |
|---|---|---|
| committer | Mary <thog@protonmail.com> | 2023-04-27 23:51:14 +0200 |
| commit | cee712105850ac3385cd0091a923438167433f9f (patch) | |
| tree | 4a5274b21d8b7f938c0d0ce18736d3f2993b11b1 /Ryujinx.Common/Memory/PartialUnmaps/NativeReaderWriterLock.cs | |
| parent | cd124bda587ef09668a971fa1cac1c3f0cfc9f21 (diff) | |
Move solution and projects to src
Diffstat (limited to 'Ryujinx.Common/Memory/PartialUnmaps/NativeReaderWriterLock.cs')
| -rw-r--r-- | Ryujinx.Common/Memory/PartialUnmaps/NativeReaderWriterLock.cs | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/Ryujinx.Common/Memory/PartialUnmaps/NativeReaderWriterLock.cs b/Ryujinx.Common/Memory/PartialUnmaps/NativeReaderWriterLock.cs deleted file mode 100644 index 78eeb16f..00000000 --- a/Ryujinx.Common/Memory/PartialUnmaps/NativeReaderWriterLock.cs +++ /dev/null @@ -1,80 +0,0 @@ -using System.Runtime.InteropServices; -using System.Threading; - -using static Ryujinx.Common.Memory.PartialUnmaps.PartialUnmapHelpers; - -namespace Ryujinx.Common.Memory.PartialUnmaps -{ - /// <summary> - /// A simple implementation of a ReaderWriterLock which can be used from native code. - /// </summary> - [StructLayout(LayoutKind.Sequential, Pack = 4)] - public struct NativeReaderWriterLock - { - public int WriteLock; - public int ReaderCount; - - public static int WriteLockOffset; - public static int ReaderCountOffset; - - /// <summary> - /// Populates the field offsets for use when emitting native code. - /// </summary> - static NativeReaderWriterLock() - { - NativeReaderWriterLock instance = new NativeReaderWriterLock(); - - WriteLockOffset = OffsetOf(ref instance, ref instance.WriteLock); - ReaderCountOffset = OffsetOf(ref instance, ref instance.ReaderCount); - } - - /// <summary> - /// Acquires the reader lock. - /// </summary> - public void AcquireReaderLock() - { - // Must take write lock for a very short time to become a reader. - - while (Interlocked.CompareExchange(ref WriteLock, 1, 0) != 0) { } - - Interlocked.Increment(ref ReaderCount); - - Interlocked.Exchange(ref WriteLock, 0); - } - - /// <summary> - /// Releases the reader lock. - /// </summary> - public void ReleaseReaderLock() - { - Interlocked.Decrement(ref ReaderCount); - } - - /// <summary> - /// Upgrades to a writer lock. The reader lock is temporarily released while obtaining the writer lock. - /// </summary> - public void UpgradeToWriterLock() - { - // Prevent any more threads from entering reader. - // If the write lock is already taken, wait for it to not be taken. - - Interlocked.Decrement(ref ReaderCount); - - while (Interlocked.CompareExchange(ref WriteLock, 1, 0) != 0) { } - - // Wait for reader count to drop to 0, then take the lock again as the only reader. - - while (Interlocked.CompareExchange(ref ReaderCount, 1, 0) != 0) { } - } - - /// <summary> - /// Downgrades from a writer lock, back to a reader one. - /// </summary> - public void DowngradeFromWriterLock() - { - // Release the WriteLock. - - Interlocked.Exchange(ref WriteLock, 0); - } - } -} |
