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/*-
* Copyright (c) 2008-2012 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* Serialization: serialization support allows scheduling operations requiring
* serialized access to a piece of memory, normally by a different thread of
* control. This includes updating and evicting pages from trees.
*
* __wt_session_serialize_func --
* Schedule a serialization request, and block or spin until it completes.
*/
static inline int
__wt_session_serialize_func(WT_SESSION_IMPL *session,
wq_state_t op, void (*func)(WT_SESSION_IMPL *), void *args)
{
WT_CONNECTION_IMPL *conn;
conn = S2C(session);
/*
* Threads serializing access to data using a function:
* call the function while holding a spinlock
* update the session sleeping state, and
* if necessary, block until an async action completes.
*/
session->wq_args = args;
session->wq_sleeping = (op == WT_SERIAL_EVICT);
/* Functions are serialized by holding a spinlock. */
__wt_spin_lock(session, &conn->serial_lock);
func(session);
__wt_spin_unlock(session, &conn->serial_lock);
switch (op) {
case WT_SERIAL_EVICT:
__wt_evict_server_wake(session);
break;
default:
break;
}
/*
* If we are waiting on a server thread, block on the session condition
* variable: when the operation is complete, this will be notified and
* we can continue.
*/
if (session->wq_sleeping)
__wt_cond_wait(session, session->cond);
return (session->wq_ret);
}
/*
* __wt_session_serialize_wrapup --
* Server function cleanup.
*/
static inline void
__wt_session_serialize_wrapup(WT_SESSION_IMPL *session, WT_PAGE *page, int ret)
{
if (ret == 0 && page != NULL) {
/*
* If passed a page and the return value is OK, we modified the
* page. Wake the eviction server as necessary if the page
* has become too large.
*/
__wt_page_modify_set(page);
(void)__wt_eviction_page_check(session, page);
}
/*
* Publish: there must be a barrier to ensure the return value is set
* before the calling thread can see its results, and the page's new
* write generation makes it to memory. The latter isn't a correctness
* issue, the write generation just needs to be updated so that readers
* get credit for reading the right version of the page, otherwise,
* they will have to retry their update for reading an old version of
* the page.
*/
WT_PUBLISH(session->wq_ret, ret);
/* If the calling thread is sleeping, wake it up. */
if (session->wq_sleeping)
__wt_cond_signal(session, session->cond);
}
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