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Compiler memory barriers do not prevent the CPU from executing the code out of order. Switch to C11 atomics. This also lets us get rid of the mutex; instead, loop until the compare_exchange succeeds. While here, change the return value of at_quick_exit() on failure to the more traditional -1, matching atexit(). Sponsored by: Klara, Inc. Reviewed by: Olivier Certner, kevans, kib Differential Revision: https://reviews.freebsd.org/D41936 (cherry picked from commit 1dc3abb052430279e47c8922d22b30922adcf0f6) libc: Add a rudimentary test for quick_exit(3). Sponsored by: Klara, Inc. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D41937 (cherry picked from commit c7dd4601aeebbc1bbe131cbe6747476c124b47fe) |
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