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This simplifies the g_lock implementation. The new implementation tries to
acquire a lock. If that fails due to a lock conflict, wait for the g_lock
record to change. Upon change, just try again. The old logic had to cope with
pending records and an ugly hack into ctdb itself. As a bonus, we now get a
really clean async g_lock_lock_send/recv that can asynchronously wait for a
global lock. This would have been almost impossible to do without the
dbwrap_record_watch infrastructure.
TDB2 returns a negative error number on failure. This is compatible
if we always check for < 0 instead of == -1.
Also, there's no tdb_traverse_read in TDB2: we don't try to make
traverse reliable any more, so there are no write locks anyway.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is the basis to implement global locks in ctdb without depending on a
shared file system. The initial goal is to make ctdb persistent transactions
deterministic without too many timeouts.
