39eae263cd
Other mechanisms that resize the shmfd grab a write lock from 0 to OFF_MAX for safety, so we still get proper synchronization of shmfd->shm_size in effect. There's no need to block readers/writers of earlier segments when we're just reserving more space, so narrow the scope -- it would likely be safe to narrow it completely to just the section of the range that extends beyond our current size, but this likely isn't worth it since the size isn't stable until the writelock is granted the first time. Suggested by: cem (passing comment)
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