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| author | kib <kib@FreeBSD.org> | 2012-03-07 07:31:50 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2012-03-07 07:31:50 +0000 |
| commit | 9d4d411642d8ae4323ed9b0a43cc35dcd602a654 (patch) | |
| tree | 962288acaad3ba101c032ff509e596c7e1619d71 /sys/sys/pipe.h | |
| parent | 1ead29e7154b634bb94ffd418424a2000e42c68c (diff) | |
| download | FreeBSD-src-9d4d411642d8ae4323ed9b0a43cc35dcd602a654.zip FreeBSD-src-9d4d411642d8ae4323ed9b0a43cc35dcd602a654.tar.gz | |
The pipe_poll() performs lockless access to the vnode to test
fifo_iseof() condition, allowing the v_fifoinfo to be reset and freed
by fifo_cleanup().
Precalculate EOF at the places were fo_wgen is changed, and cache the
state in a new pipe state flag PIPE_SAMEWGEN.
Reported and tested by: bf
Submitted by: gianni
MFC after: 1 week (a backport)
Diffstat (limited to 'sys/sys/pipe.h')
| -rw-r--r-- | sys/sys/pipe.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/pipe.h b/sys/sys/pipe.h index 36e3021..d60185a 100644 --- a/sys/sys/pipe.h +++ b/sys/sys/pipe.h @@ -96,6 +96,7 @@ struct pipemapping { #define PIPE_DIRECTW 0x400 /* Pipe direct write active. */ #define PIPE_DIRECTOK 0x800 /* Direct mode ok. */ #define PIPE_NAMED 0x1000 /* Is a named pipe. */ +#define PIPE_SAMEWGEN 0x2000 /* same write generation for named pipes. */ /* * Per-pipe data structure. |
