Understanding the rationale behind a rule when trying to circumvent it
In the documentation for best practices for implementing process and thread-related callback functions, it calls out Keep routines short and simple. Don’t make calls into a user mode service to validate the process, thread, or image. Don’t make blocking and/or Interprocess Communication (IPC) function calls.
- ▪In the documentation for best practices for implementing process and thread-related callback functions, it calls out Keep routines short and simple.
- ▪Don’t make calls into a user mode service to validate the process, thread, or image.
- ▪Don’t make blocking and/or Interprocess Communication (IPC) function calls.
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| Original publisher | The Old New Thing |
| Canonical URL | https://devblogs.microsoft.com/oldnewthing/20260611-00/?p=112415 |
| Publication time | Tue, 16 Jun 2026 07:35:27 +0000 |
| Retrieval time | 2026-06-16T08:14:38.874Z |
| Last seen | 2026-06-16T08:14:38.874Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | Vus1wGFuM-RA |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
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Opening excerpt (first ~120 words) tap to expand
In the documentation for best practices for implementing process and thread-related callback functions, it calls out Keep routines short and simple. Don’t make calls into a user mode service to validate the process, thread, or image. Don’t make registry calls. Don’t make blocking and/or Interprocess Communication (IPC) function calls. Don’t synchronize with other threads because it can lead to reentrancy deadlocks. So far so good. It seems that these callback functions need to operate quickly and cannot block. These are callbacks that are invoked when a process starts or exits, when a thread starts or exits, when a DLL or EXE is loaded or unloaded, and various other low-level events.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at The Old New Thing.