[vlc-devel] [PATCH 19/41] Implement thread support for OS/2

[KO Myung-Hun]

Rémi Denis-Courmont wrote:
> On Fri, 14 Oct 2011 23:28:46 +0900, KO Myung-Hun <komh78 at gmail.com> wrote:
>>>> +typedef struct
>>>> +{
>>>> +    HEV  hev;
>>>> +    HMTX wait_mutex;
>>>> +    HMTX count_mutex;
>>>> +    int  count;
>>>> +    int  max_count;
>>>> +} vlc_sem_t;
>>>
>>> A semaphore can be reimplemented with one mutex, one condition variable
>>> and
>>> one integer. So it's surprising that 'HMTX' are required here.
> 
>> HMTX is a mutex. What problem ?
> 
> I just meant to say that a semaphore should need only one mutex (and one
> condition variable), not two mutexes (and one condition variable).
> 

One is for a hev variable to wake up a thread one by one, and the other
is for a count varaible to prevent a race condition between post() and
wait().

HEV does not match to a condition variable exactly.

-- 
KO Myung-Hun

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