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Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set s


From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock
Date: Fri, 8 Apr 2016 14:31:18 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

On 04/08/2016 02:26 PM, Paolo Bonzini wrote:
> 
> 
> On 08/04/2016 23:24, Alex Bennée wrote:
>>> Except that quite a lot of hosts can only (efficiently) do atomic 
>>> operations on
>>> a minimum of 4 byte quantities.  I'd rather continue to use int here.
>>
>> I suspect bool == unsigned int underneath. But having true/false and 0/1 
>> mixed up
>> gets confusing even if they are equivalent.
> 
> Sometimes sizeof(bool) == 1.

sizeof(bool) == 1 everywhere except MacOSX, where it's 4.


r~




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