On 08/26/2009 10:13 PM, Davide Libenzi wrote:
Ok, so why not using the eventfd counter as state? On the device side:void write_state(int sfd, int state) { u64 cnt; /* Clear the current state, sfd is in non-blocking mode */ read(sfd,&cnt, sizeof(cnt)); /* Writes new state */ cnt = 1 + !!state; write(sfd,&cnt, sizeof(cnt)); } On the hypervisor side: int read_state(int sfd) { u64 cnt; read(sfd,&cnt, sizeof(cnt)); return state - 1; }
Hadn't though of read+write as set. While the 1+ is a little ugly, it's workable.
I see no kernel equivalent to read(), but that's easily done. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
