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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [PATCH v3 05/11] qemu-thread: add simple test-and-set spinlock |
Date: | Wed, 20 Apr 2016 10:55:45 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 |
On 04/20/2016 10:17 AM, Emilio G. Cota wrote:
I've tried to find a GCC intrinsic for test-and-set, and I've only found lock_test_and_set, which is what we use for atomic_xchg (except on ppc) because it really is an atomic exchange: "This builtin, as described by Intel, is not a traditional test-and-set operation, but rather an atomic exchange operation." https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html
Please read the entire documentation, not just the first sentence. r~
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