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`panic!` does not print any identifying information for threads that are
unnamed. However, in many cases, the thread ID can be determined.
This changes the panic message from something like this:
thread '<unnamed>' panicked at src/main.rs:3:5:
explicit panic
To something like this:
thread '<unnamed>' (0xff9bf) panicked at src/main.rs:3:5:
explicit panic
Stack overflow messages are updated as well.
This change applies to both named and unnamed threads. The ID printed is
the OS integer thread ID rather than the Rust thread ID, which should
also be what debuggers print.
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Using clock nanosleep leads to more accurate sleep times on platforms
where it is supported.
To enable using clock_nanosleep this makes `sleep_until` platform
specific. That unfortunatly requires identical placeholder
implementations for the other platforms (windows/mac/wasm etc).
we will land platform specific implementations for those later. See the
`sleep_until` tracking issue.
This requires an accessors for the Instant type. As that accessor is only
used on the platforms that have clock_nanosleep it is marked as allow_unused.
32bit time_t targets do not use clock_nanosleep atm, they instead rely
on the same placeholder as the other platforms. We could make them
use clock_nanosleep too in the future using `__clock_nanosleep_time64`.
__clock_nanosleep_time64 is documented at:
https://www.gnu.org/software/libc/manual/html_node/64_002dbit-time-symbol-handling.html
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Prevent copy-paste errors from producing new starved-for-resources
threaded platforms by raising `DEFAULT_MIN_STACK_SIZE` from 4096 bytes
to at least 64KiB.
Two platforms "affected" by this have no actual threads:
- UEFI
- "unsupported"
Platforms that this actually affects:
- wasm32-wasi with "atomics" enabled
- wasm32-wasi-p1-threads
Two exceptions:
- SGX: a "secure code execution" platform, stays at 4096B
- TEEOS: also a "secure code execution" platform, stays at 8192B
I believe either of these may have sufficiently "interesting" semantics
around threads, or significant external library support. Either would
mean making any choices here for them is suspect.
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This reverts #121666 due to #123495
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