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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Richard Henderson" <richard.henderson@linaro.org>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org
Subject: Re: [PATCH] qemu/atomic.h: add #ifdef guards for stdatomic.h
Date: Thu, 26 Mar 2020 21:05:12 +0100
Message-ID: <f01e8676-ce02-dcb1-e614-822699eb97d8@redhat.com> (raw)
In-Reply-To: <fd05f470-1c3f-3357-ac91-26c06379bee2@linaro.org>

On 26/03/20 20:58, Richard Henderson wrote:
>> +
>> +#ifndef atomic_fetch_add
>>  #define atomic_fetch_add(ptr, n) __atomic_fetch_add(ptr, n, __ATOMIC_SEQ_CST)
>>  #define atomic_fetch_sub(ptr, n) __atomic_fetch_sub(ptr, n, __ATOMIC_SEQ_CST)
>>  #define atomic_fetch_and(ptr, n) __atomic_fetch_and(ptr, n, __ATOMIC_SEQ_CST)
>>  #define atomic_fetch_or(ptr, n)  __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST)
>>  #define atomic_fetch_xor(ptr, n) __atomic_fetch_xor(ptr, n, __ATOMIC_SEQ_CST)
>> +#endif
> Do we really get sequential consistency from <stdatomic.h>?

Yes, it's the default value (to pass a memory order you need
atomic_fetch_*_explicit).

Paolo

> Should we not in fact #undef as a workaround instead?



      reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 17:01 Alex Bennée
2020-03-26 17:14 ` Peter Maydell
2020-03-26 17:32   ` Alex Bennée
2020-03-26 18:05   ` Paolo Bonzini
2020-03-26 20:19     ` Peter Maydell
2020-03-27  9:51       ` Alex Bennée
2020-03-27 13:35         ` Richard Henderson
2020-03-26 19:58 ` Richard Henderson
2020-03-26 20:05   ` Paolo Bonzini [this message]

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