RDS: Change send lock from a mutex to a spinlock

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This change allows us to call rds_send_xmit() from a tasklet,
which is crucial to our new operating model.

* Change c_send_lock to a spinlock
* Update stats fields "sem_" to "_lock"
* Remove unneeded rds_conn_is_sending()

About locking between shutdown and send -- send checks if the
connection is up. Shutdown puts the connection into
DISCONNECTING. After this, all threads entering send will exit
immediately. However, a thread could be *in* send_xmit(), so
shutdown acquires the c_send_lock to ensure everyone is out
before proceeding with connection shutdown.

Signed-off-by: Andy Grover <andy.grover@oracle.com>

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This commit is contained in:

Andy Grover 2010-03-23 17:39:07 -07:00

parent f17a1a55fb

commit 049ee3f500

4 changed files with 18 additions and 29 deletions

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22

net/rds/connection.c

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6

net/rds/rds.h

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15

net/rds/send.c

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4

net/rds/stats.c

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