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Code Issues Releases Activity

Fix Linux hang on shutdown (#4617)

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* Rework StdErr-to-log redirection to use built-in FileStream, and do reads asynchronously to avoid hanging the process shutdown.

* set _disposable to false ASAP
This commit is contained in:
jhorv 2023-03-30 16:07:07 -04:00 committed by GitHub
parent 460f96967d
commit 8198b99935
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 33 additions and 172 deletions
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50
Ryujinx.Common/SystemInterop/StdErrAdapter.cs
View file

@ -1,18 +1,21 @@
using Microsoft.Win32.SafeHandles;
using Ryujinx.Common.Logging;
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Threading;
using System.Threading.Tasks;
namespace Ryujinx.Common.SystemInterop
{
public partial class StdErrAdapter : IDisposable
{
private bool _disposable = false;
private UnixStream _pipeReader;
private UnixStream _pipeWriter;
private Thread _worker;
private Stream _pipeReader;
private Stream _pipeWriter;
private CancellationTokenSource _cancellationTokenSource;
private Task _worker;
public StdErrAdapter()
{
@ -31,37 +34,39 @@ namespace Ryujinx.Common.SystemInterop
(int readFd, int writeFd) = MakePipe();
dup2(writeFd, stdErrFileno);
_pipeReader = new UnixStream(readFd);
_pipeWriter = new UnixStream(writeFd);
_pipeReader = CreateFileDescriptorStream(readFd);
_pipeWriter = CreateFileDescriptorStream(writeFd);
_worker = new Thread(EventWorker);
_cancellationTokenSource = new CancellationTokenSource();
_worker = Task.Run(async () => await EventWorkerAsync(_cancellationTokenSource.Token), _cancellationTokenSource.Token);
_disposable = true;
_worker.Start();
}
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
private void EventWorker()
private async Task EventWorkerAsync(CancellationToken cancellationToken)
{
TextReader reader = new StreamReader(_pipeReader);
using TextReader reader = new StreamReader(_pipeReader, leaveOpen: true);
string line;
while ((line = reader.ReadLine()) != null)
while (cancellationToken.IsCancellationRequested == false && (line = await reader.ReadLineAsync(cancellationToken)) != null)
{
Logger.Error?.PrintRawMsg(line);
}
}
private void Dispose(bool disposing)
{
if (_disposable)
{
_disposable = false;
if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
{
_cancellationTokenSource.Cancel();
_worker.Wait(0);
_pipeReader?.Close();
_pipeWriter?.Close();
}
_disposable = false;
}
}
@ -74,11 +79,11 @@ namespace Ryujinx.Common.SystemInterop
private static partial int dup2(int fd, int fd2);
[LibraryImport("libc", SetLastError = true)]
private static unsafe partial int pipe(int* pipefd);
private static partial int pipe(Span<int> pipefd);
private static unsafe (int, int) MakePipe()
private static (int, int) MakePipe()
{
int *pipefd = stackalloc int[2];
Span<int> pipefd = stackalloc int[2];
if (pipe(pipefd) == 0)
{
@ -89,5 +94,16 @@ namespace Ryujinx.Common.SystemInterop
throw new();
}
}
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
private static Stream CreateFileDescriptorStream(int fd)
{
return new FileStream(
new SafeFileHandle((IntPtr)fd, ownsHandle: true),
FileAccess.ReadWrite
);
}
}
}

155
Ryujinx.Common/SystemInterop/UnixStream.cs
View file

@ -1,155 +0,0 @@
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
namespace Ryujinx.Common.SystemInterop
{
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
public partial class UnixStream : Stream, IDisposable
{
private const int InvalidFd = -1;
private int _fd;
[LibraryImport("libc", SetLastError = true)]
private static partial long read(int fd, IntPtr buf, ulong count);
[LibraryImport("libc", SetLastError = true)]
private static partial long write(int fd, IntPtr buf, ulong count);
[LibraryImport("libc", SetLastError = true)]
private static partial int close(int fd);
public UnixStream(int fd)
{
if (InvalidFd == fd)
{
throw new ArgumentException("Invalid file descriptor");
}
_fd = fd;
CanRead = read(fd, IntPtr.Zero, 0) != -1;
CanWrite = write(fd, IntPtr.Zero, 0) != -1;
}
~UnixStream()
{
Close();
}
public override bool CanRead { get; }
public override bool CanWrite { get; }
public override bool CanSeek => false;
public override long Length => throw new NotSupportedException();
public override long Position
{
get => throw new NotSupportedException();
set => throw new NotSupportedException();
}
public override void Flush()
{
}
public override unsafe int Read([In, Out] byte[] buffer, int offset, int count)
{
if (offset < 0 || offset > (buffer.Length - count) || count < 0)
{
throw new ArgumentOutOfRangeException();
}
if (buffer.Length == 0)
{
return 0;
}
long r = 0;
fixed (byte* buf = &buffer[offset])
{
do
{
r = read(_fd, (IntPtr)buf, (ulong)count);
} while (ShouldRetry(r));
}
return (int)r;
}
public override unsafe void Write(byte[] buffer, int offset, int count)
{
if (offset < 0 || offset > (buffer.Length - count) || count < 0)
{
throw new ArgumentOutOfRangeException();
}
if (buffer.Length == 0)
{
return;
}
fixed (byte* buf = &buffer[offset])
{
long r = 0;
do {
r = write(_fd, (IntPtr)buf, (ulong)count);
} while (ShouldRetry(r));
}
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Close()
{
if (_fd == InvalidFd)
{
return;
}
Flush();
int r;
do {
r = close(_fd);
} while (ShouldRetry(r));
_fd = InvalidFd;
}
void IDisposable.Dispose()
{
Close();
}
private bool ShouldRetry(long r)
{
if (r == -1)
{
const int eintr = 4;
int errno = Marshal.GetLastPInvokeError();
if (errno == eintr)
{
return true;
}
throw new SystemException($"Operation failed with error 0x{errno:X}");
}
return false;
}
}
}