peter/qemu - QEMU hacking for Peter

Age	Commit message (Collapse)	Author	Files	Lines
2013-10-17	seqlock: introduce read-write seqlock	Paolo Bonzini	1	-0/+72
	Seqlock implementation for QEMU. Usage idiom reader: do { start = seqlock_read_begin(&sl); ... } while (seqlock_read_retry(&sl, start)); writer: seqlock_write_lock(&sl); ... seqlock_write_unlock(&sl); initialization: seqlock_init(QemuSeqLock sl, QemuMutex mutex) mutex could be NULL if the caller will provide its own protection for concurrent write sides (typically using the BQL). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>