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Keep the logical target for dynamic dispatch names while selecting kernel sources and capabilities from the core chosen by getarch after ISA restrictions.
Pass DYNAMIC_LIST as a semicolon-separated CMake list so each target becomes a separate preprocessor definition. Make the affected scripts fail immediately instead of masking configuration failures.
Long-running BLAS calls (a large gemm can run for minutes) cannot
currently be interrupted: callers embedding OpenBLAS (e.g. the Julia
runtime responding to a user's ^C) can only wait for completion or kill
the process. Add a minimal cooperative cancellation protocol:
Every thread owns a pointer-sized generation slot in thread-local
storage, whose stable address is returned by openblas_cancel_token().
Instrumented compute drivers advance the slot to a fresh even
generation at operation entry on the issuing thread (forwarding the
slot and generation to worker threads through blas_arg_t) and poll it
at block granularity. openblas_cancel(token, loaded_token) - callable
from any thread - sets the cancel bit (bit 0) iff the slot still holds
loaded_token, so a canceller that loaded the value while an operation
was in flight stops exactly that operation, while stale or racing
requests either miss or dirty an already-dead generation, both
harmless. There is no object lifecycle: nothing to allocate, bind,
reset, or free.
A cancelled operation returns quickly, leaving its output buffer in an
unspecified partially-updated state that the caller must discard; every
synchronization point in the threaded driver is still executed, so
sibling threads never stall and the library remains consistent for
subsequent calls. Coverage: the level-3 gemm/symm/hemm drivers
(level3.c and level3_thread.c).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012nCkyKUguncLLJrH9K5o7m
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Martin Kroeker