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authorroot <root>2011-01-10 14:24:26 +0000
committerroot <root>2011-01-10 14:24:26 +0000
commit67377753a259e327fb690da4f8ed746a8819f22e (patch)
treef29bf796379df0f601c77d4cccb0c4c9445087cc /ev.pod
parentd792665ddfc14bef596bb3832648570eed11b4df (diff)
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Diffstat (limited to 'ev.pod')
-rw-r--r--ev.pod18
1 files changed, 10 insertions, 8 deletions
diff --git a/ev.pod b/ev.pod
index 56156b6..79e49d8 100644
--- a/ev.pod
+++ b/ev.pod
@@ -584,19 +584,21 @@ immensely.
This uses the Solaris 10 event port mechanism. As with everything on Solaris,
it's really slow, but it still scales very well (O(active_fds)).
-Please note that Solaris event ports can deliver a lot of spurious
-notifications, so you need to use non-blocking I/O or other means to avoid
-blocking when no data (or space) is available.
-
While this backend scales well, it requires one system call per active
file descriptor per loop iteration. For small and medium numbers of file
descriptors a "slow" C<EVBACKEND_SELECT> or C<EVBACKEND_POLL> backend
might perform better.
-On the positive side, with the exception of the spurious readiness
-notifications, this backend actually performed fully to specification
-in all tests and is fully embeddable, which is a rare feat among the
-OS-specific backends (I vastly prefer correctness over speed hacks).
+On the positive side, this backend actually performed fully to
+specification in all tests and is fully embeddable, which is a rare feat
+among the OS-specific backends (I vastly prefer correctness over speed
+hacks).
+
+On the negative side, the interface is I<bizarre>, with the event polling
+function sometimes returning events to the caller even though an error
+occured, but with no indication whether it has done so or not (yes, it's
+even documented that way) - deadly for edge-triggered interfaces, but
+fortunately libev seems to be able to work around it.
This backend maps C<EV_READ> and C<EV_WRITE> in the same way as
C<EVBACKEND_POLL>.