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Re: [Qemu-devel] [PATCH v3 05/11] qemu-thread: add simple test-and-set s

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."

Please read the entire documentation, not just the first sentence.


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