[libvirt] [PATCH v2 1/4] Add a read/write lock implementation

[Eric Blake]

On 01/27/2014 10:18 AM, Daniel P. Berrange wrote:
> Add virRWLock backed up by a POSIX rwlock primitive
> 
> Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
> ---

> +int virRWLockInit(virRWLockPtr m)
> +{
> +    if (pthread_rwlock_init(&m->lock, NULL) != 0) {
> +        errno = EINVAL;
> +        return -1;

My concern from v1 still stands - this blindly overwrites non-EINVAL
errors, and better would be:

int rc = pthread_rwlock_init(&m->lock, NULL);
if (rc) {
    errno = rc;
    return -1;
}


> +void virRWLockDestroy(virRWLockPtr m)
> +{
> +    pthread_rwlock_destroy(&m->lock);

Likewise, it might be nice to add VIR_DEBUG messages when discarding a
non-zero result, as a way to diagnose the programmer errors that caused
that situation.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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