SBL_BlockNotifications blocks delivery of notifications.
SBL_BlockNotifications blocks delivery of notifications to all
receive buffers of a calling process.
Blocked notifications are queued and will be delivered after notifications
are unblocked by a call to SBL_UnblockNotifications. Each
call to SBL_BlockNotifications should be paired with a call to SBL_UnblockNotifications. These
pairs can be nested, in which case the last SBL_UnblockNotifications will
Notifications are automatically blocked when a notification handler is
called, and unblocked when a notification handler returns.
SBL_BlockNotifications can be called from within a notification
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