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Keep the small-object allocator out of worker executables

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Upstream native workers (095b6193) build every runtime unit with
-DSCR_WORKERS and run one runtime instance per thread. The small-object
allocator state is process-global and unsynchronized, so worker builds
fall back to the system allocator, exactly like thread-instanced library
archives. Ordinary executables keep the allocator unchanged.
This commit is contained in:
Malte Ubl
2026-10-08 15:01:26 -05:00
committed by GitHub
parent 8a9b1948e0
commit 78fef71f09
1 changed files with 4 additions and 3 deletions
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packages/runtime/src/scr_runtime.h
+4 -3
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@@ -433,14 +433,15 @@ void scr_cyc_free(void *obj); /* frees the block, header included */
* Compiled to the plain system calls under SCR_RC_AUDIT and AddressSanitizer
* (the audit lane must see every logical free as a real free), on targets
* without a cheap address-space reservation (wasm32, Windows, 32-bit), and
* in thread-instanced library archives, whose per-thread instances would
* strand each other's free lists. Elsewhere the allocator state is
* in thread-instanced library archives and worker executables (SCR_WORKERS),
* where several runtime instances run on their own threads and would race
* on, or strand each other's, free lists. Elsewhere the allocator state is
* process-global and unsynchronized: runtime objects are only allocated and
* freed on the runtime thread (native worker jobs never touch them). */
#include <stdlib.h>
#if defined(SCR_RC_AUDIT) || defined(__SANITIZE_ADDRESS__) || defined(__wasi__) || \
defined(__wasm__) || defined(_WIN32) || UINTPTR_MAX != UINT64_MAX || \
(defined(SCR_LIB) && defined(SCR_THREAD_INSTANCES))
(defined(SCR_LIB) && defined(SCR_THREAD_INSTANCES)) || defined(SCR_WORKERS)
#define SCR_SMALL_ALLOC 0
#elif defined(__has_feature)
#if __has_feature(address_sanitizer)