[vlc-devel] [PATCH 1/6] os2: implement vlc_once()

[Kamil Rytarowski]

On 26.03.2018 13:16, KO Myung-Hun wrote:
> 
> 
> Rémi Denis-Courmont wrote:
>> POSIX model is simpler here, but it wouldn't work with C11 either.
> 
> How about this ?
> 

There is no need for a mutex.

An algorithm like follows should work better:

static atomic_uint32_t bg_thread = {};
if (atomic_load(&bg_thread, memory_order_relaxed) == 0 &&
    atomic_exchange(&bg_thread, 1, memory_order_relaxed) == 0) {
  cb();
}

There is need to adapt it for GCC / VLC API.

> 
> 
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