Utilize bitshifts correctly in signals-mach.c when storing/reading the previous GC state #53868
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…e previous GC state
vtjnash
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Keno
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Mar 26, 2024
src/signals-mach.c
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| uintptr_t item = (uintptr_t)suspended_threads.items[i]; | ||
| int16_t tid = (int16_t)item; | ||
| int8_t gc_state = (int8_t)(item >> 8); | ||
| int8_t gc_state = (int8_t)(item >> 16); |
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Let's do a toplevel #define for this and while we're at it, spell it 8*sizeof(int16_t).
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…e previous GC state
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Keno
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…e previous GC state (#53868) I have not succeed in writing a test for this, but this was found on a CI hang together with @Keno and @vtjnash. In essence if we hit a safepoint while GC_SAFE things can go wrong <img width="748" alt="image" src="https://github.com/JuliaLang/julia/assets/28694980/7d8170ee-11ab-43de-9bb1-9219aa5a2d80"> (cherry picked from commit 1e50a99)
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I have not succeed in writing a test for this, but this was found on a CI hang together with @Keno and @vtjnash.
In essence if we hit a safepoint while GC_SAFE things can go wrong
