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Avoid bogus event loop wakeups in remote driver when doing RPC call

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This commit is contained in:
Daniel P. Berrange 2009-01-20 11:45:09 +00:00
parent ed493909f7
commit c790f6d25e
2 changed files with 40 additions and 8 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Tue Jan 20 11:43:53 GMT 2009 Daniel P. Berrange <berrange@redhat.com>
* src/remote_internal.c: Disable event watch when doing an
RPC call to avoid bogus event loop wakeups which would
block on a lock
Tue Jan 20 11:28:53 GMT 2009 Daniel P. Berrange <berrange@redhat.com>
* src/remote_internal.c: Add locking to all public API entry

42
src/remote_internal.c
View File

@ -754,9 +754,7 @@ doRemoteOpen (virConnectPtr conn,
DEBUG0("Adding Handler for remote events");
/* Set up a callback to listen on the socket data */
if ((priv->watch = virEventAddHandle(priv->sock,
VIR_EVENT_HANDLE_READABLE |
VIR_EVENT_HANDLE_ERROR |
VIR_EVENT_HANDLE_HANGUP,
VIR_EVENT_HANDLE_READABLE,
remoteDomainEventFired,
conn, NULL)) < 0) {
DEBUG0("virEventAddHandle failed: No addHandleImpl defined."
@ -5555,11 +5553,11 @@ static int really_read (virConnectPtr conn, struct private_data *priv,
* else Bad Things will happen in the XDR code.
*/
static int
call (virConnectPtr conn, struct private_data *priv,
int flags /* if we are in virConnectOpen */,
int proc_nr,
xdrproc_t args_filter, char *args,
xdrproc_t ret_filter, char *ret)
doCall (virConnectPtr conn, struct private_data *priv,
int flags /* if we are in virConnectOpen */,
int proc_nr,
xdrproc_t args_filter, char *args,
xdrproc_t ret_filter, char *ret)
{
char buffer[REMOTE_MESSAGE_MAX];
char buffer2[4];
@ -5750,6 +5748,34 @@ retry_read:
}
}
static int
call (virConnectPtr conn, struct private_data *priv,
int flags /* if we are in virConnectOpen */,
int proc_nr,
xdrproc_t args_filter, char *args,
xdrproc_t ret_filter, char *ret)
{
int rv;
/*
* Avoid needless wake-ups of the event loop in the
* case where this call is being made from a different
* thread than the event loop. These wake-ups would
* cause the event loop thread to be blocked on the
* mutex for the duration of the call
*/
if (priv->watch >= 0)
virEventUpdateHandle(priv->watch, 0);
rv = doCall(conn, priv,flags, proc_nr,
args_filter, args,
ret_filter, ret);
if (priv->watch >= 0)
virEventUpdateHandle(priv->watch, VIR_EVENT_HANDLE_READABLE);
return rv;
}
static int
really_write_buf (virConnectPtr conn, struct private_data *priv,
int in_open /* if we are in virConnectOpen */,