struct list is a common name and can't be used in public headers.
Signed-off-by: Thomas Graf <tgraf@noironetworks.com>
Acked-by: Ben Pfaff <blp@nicira.com>
fat_rwlock_tryrdlock() used to call fat_rwlock_get_slot__() which could block
in the "slow path" case. This commit adds fat_rwlock_try_get_slot__() which
does not block, even in the "slow path" case.
This fixes a minor issue in dpif-netdev: when the datapath has no registered
upcall handler (e.g. if it is created with dpctl commands), dp_netdev_input()
hangs if it does not find a packet's flow in the classifier. This is
because dpif-netdev uses its upcall_rwlock as a way to enable and disable
upcalls and thus holds the upcall_rwlock write lock as long as upcalls are
disabled. Both holding the write lock and creating a slot require the
fat_rwlock's mutex, causing the hang.
Signed-off-by: Daniele Di Proietto <ddiproietto@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This factors code out of fat-rwlock, making it easily usable by other code.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>
This implements a reader-writer lock that uses a lot of memory (128 to 192
bytes per thread that takes the lock) but avoids cache line bouncing when
taking the read side. Thus, a fat_rwlock is a good choice for rwlocks
taken frequently by readers.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
