diff options
| author | Thiago Macieira <thiago.macieira@intel.com> | 2012-10-25 12:38:13 -0700 |
|---|---|---|
| committer | The Qt Project <gerrit-noreply@qt-project.org> | 2013-01-15 03:29:29 +0100 |
| commit | f927efd77a8e75e330b3592996277ad6e6eb6a8d (patch) | |
| tree | b7226a2eb337446a9a256b28fae469d9847b5b3b /src/corelib/kernel/qeventdispatcher_unix_p.h | |
| parent | dbfa6518890f4e6c4af6da92df45803ecfe0309a (diff) | |
Add support for Linux eventfd(7) in the UNIX event loop
eventfd(7) uses less resources than a pipe, as it only needs to store a
single 64-bit integer, as opposed to a full buffer.
It was introduced first on Linux version 2.6.22 and glibc 2.7. However,
both the configure-time test and the runtime usage require the use of
EFD_CLOEXEC for thread-safety, so this code will be enabled only for
Linux 2.6.27 and up as well as glibc 2.9 and up.
Change-Id: Ic7e10b28d7b1d4ca24be614ed84055c4429a68e4
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Diffstat (limited to 'src/corelib/kernel/qeventdispatcher_unix_p.h')
| -rw-r--r-- | src/corelib/kernel/qeventdispatcher_unix_p.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/corelib/kernel/qeventdispatcher_unix_p.h b/src/corelib/kernel/qeventdispatcher_unix_p.h index 98ea19ced8..e96acf65af 100644 --- a/src/corelib/kernel/qeventdispatcher_unix_p.h +++ b/src/corelib/kernel/qeventdispatcher_unix_p.h @@ -148,6 +148,9 @@ public: virtual int processThreadWakeUp(int nsel); bool mainThread; + + // note for eventfd(7) support: + // if thread_pipe[1] is -1, then eventfd(7) is in use and is stored in thread_pipe[0] int thread_pipe[2]; // highest fd for all socket notifiers |