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| author | kib <kib@FreeBSD.org> | 2010-01-07 13:31:00 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-01-07 13:31:00 +0000 |
| commit | fe8ccb0bf3097cfe7df2a8e79774b7d216993368 (patch) | |
| tree | 1041e5cbc5db0f55aaec0f93cc8cfc3badea162b | |
| parent | 5a3a95e8871a2f6048962b4a29f3a0f24162905d (diff) | |
| download | FreeBSD-src-fe8ccb0bf3097cfe7df2a8e79774b7d216993368.zip FreeBSD-src-fe8ccb0bf3097cfe7df2a8e79774b7d216993368.tar.gz | |
Give some information on SF_MNOWAIT flag.
MFC after: 3 days
| -rw-r--r-- | lib/libc/sys/sendfile.2 | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/libc/sys/sendfile.2 b/lib/libc/sys/sendfile.2 index 322971f..612ff5c 100644 --- a/lib/libc/sys/sendfile.2 +++ b/lib/libc/sys/sendfile.2 @@ -116,9 +116,17 @@ Busy servers may benefit by transferring requests that would block to a separate I/O worker thread. .It .Dv SF_MNOWAIT . -(description missing) +Do not wait for some kernel resource to become available, +in particular, +.Vt mbuf +and +.Vt sf_buf . +The flag does not make the +.Fn sendfile +syscall trully non-blocking, since other resources are still allocated +in blocking fashion. .It -.Dv SF_SYNC , +.Dv SF_SYNC . .Nm sleeps until the network stack no longer references the VM pages of the file, making subsequent modifications to it safe. |
