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Added parsing support for the QNX platform Coredump's thread ids format and fixed VSCODE .devcontainer compilation failure #1398

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@khvysofq khvysofq commented May 3, 2023

This PR fixes two issues.

  1. It fixes the compilation error issue in vscode/.devcontainer. The .Net version in the Docker image in the current version is different from the .Net version used in the actual main branch, and it is not possible to generate the latest available compilation image correctly through the Dockerfile. The fix uses a fixed .Net official image, the Linux platform version, and does not require the installation of gcc-related tools, so it can be compiled directly. https://github.com/microsoft/vscode-dev-containers/tree/main/containers/dotnet
  2. It adds support for the parsing format of Thread ID in QNX Coredump. The format of threads in Coredump in the QNX platform is "pid <pid> tid <pid>", e.g., "pid 4194373 tid 308", and this format is currently not supported.

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khvysofq commented May 3, 2023

@microsoft-github-policy-service agree

@khvysofq khvysofq changed the title Add supporting for parse QNX coredumps thread's id format and fixed bulid error in vscode .devcontainer Added parsing support for the QNX platform Coredump's thread ids format and fixed VSCODE .devcontainer compilation failure May 3, 2023
@gregg-miskelly gregg-miskelly requested a review from WardenGnaw May 5, 2023 22:21
@@ -44,7 +44,7 @@ internal class ThreadCache
private List<DebuggedThread> _deadThreads;
private List<DebuggedThread> _newThreads;
private Dictionary<string, List<int>> _threadGroups;
private static uint s_targetId = uint.MaxValue;
private static uint s_targetId = 0; // Thread ids should be start at 0 in the default scenario
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Can you talk about why you changed this part? Unfortunately there are no comments to say for sure, but I think the idea of starting with uint.MaxValue was to select something that was highly unlikely to clash with actual thread ids in the case that the thread id couldn't be parsed.

This code was added in commit 12632f3280da94787c009c8a97accbe797ac6994, but the author didn't add any more details, and I am sure the author no longer remembers.

{
// In QNX gdb coredumps the thread name is in the form:"pid <pid> tid <pid>", eg "pid 4194373 tid 308"
int tid_pos = targetId.IndexOf("tid ", StringComparison.Ordinal);
int len = targetId.Length - (tid_pos + 4);
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Need to put the rest of this block in if (tid_pos >= 0)

// In QNX gdb coredumps the thread name is in the form:"pid <pid> tid <pid>", eg "pid 4194373 tid 308"
int tid_pos = targetId.IndexOf("tid ", StringComparison.Ordinal);
int len = targetId.Length - (tid_pos + 4);
if (len > 0 && System.UInt32.TryParse(targetId.Substring(tid_pos + 4, len), out tid) && tid != 0)
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nit: Use a constant for tid and use '<const_name>.Length` instead of '4' so it is obvious what the '4' means.

Example:

const string tidPrefix = "tid ";
int tid_pos = targetId.IndexOf(tidPrefix, ...)
int len = targetId.Lenth - (tid_pos + tidPrefix.Length);
if (... && UInt32.TryParse(targetId.Substring(tid_pos + tidPrefix.Length...)

"image":"mcr.microsoft.com/vscode/devcontainers/dotnet:6.0-focal",
"remoteUser": "root"
// "postCreateCommand": "",
// "build": {
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Please just delete the commented out code

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2 participants