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

From: Sergey Fedorov
Subject: Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock
Date: Sat, 9 Apr 2016 00:35:42 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 09/04/16 00:31, Richard Henderson wrote:
> 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.

Hm, that's too strange:

$ gcc a.c
a.c: In function ‘main’:
a.c:6:5: warning: format ‘%d’ expects argument of type ‘int’, but
argument 2 has type ‘long unsigned int’ [-Wformat=]
     printf("%d\n", sizeof(bool));
$ ./a.out

Kind regards,

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