Deduce arena grain size in MMQA test function/136.c. #88
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On Apple Silicon, when Hardened Runtime is in force and the application lacks the "Allow Unsigned Executable Memory Entitlement", mmap and mprotect return EACCES when an attempt is made to create or modify memory so that it is simultaneously writable and executable. This commit handles these cases by retrying the operation without the PROT_EXEC flag, and setting global variables so that future operations omit the flag.
* Use memory-model-aware builtins in GCC and Clang when a memory location may be written by one thread and read by another, avoiding race conditions due to out-of-order updates on ARM. * Call dylan_make_wrappers while the test is still single-threaded, preventing multiple threads from racing to call it. * Prevent dylan_init from creating a padding object, as we must not have an exact root pointing at a padding object.
This makes the test portable to XCA6LL, where the page size (and so the minimum arena grain size) can be 16 kB.
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This makes the test portable to XCA6LL, where the page size (and so the minimum arena grain size) can be 16 kB.
This fixes one of the test failures in #84.