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| author | pb <pb@FreeBSD.org> | 2003-07-30 22:50:37 +0000 |
|---|---|---|
| committer | pb <pb@FreeBSD.org> | 2003-07-30 22:50:37 +0000 |
| commit | edb5fbc5cc2aa91573568504f4da98fc234892d9 (patch) | |
| tree | 34fee790dedcfa044a77955766fa37194fc58f5f /sys/kern/sys_pipe.c | |
| parent | 72fb563d453e9d9301d51365862f2b2e10ec94ba (diff) | |
| download | FreeBSD-src-edb5fbc5cc2aa91573568504f4da98fc234892d9.zip FreeBSD-src-edb5fbc5cc2aa91573568504f4da98fc234892d9.tar.gz | |
Remove test in pipe_write() which causes write(2) to return EAGAIN
on a non-blocking pipe in cases where select(2) returns the file
descriptor as ready for write. This in turns causes libc_r, for
one, to busy wait in such cases.
Note: it is a quick performance fix, a more complex fix might be
required in case this turns out to have unexpected side effects.
Reviewed by: silby
MFC after: 3 days
Diffstat (limited to 'sys/kern/sys_pipe.c')
| -rw-r--r-- | sys/kern/sys_pipe.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/kern/sys_pipe.c b/sys/kern/sys_pipe.c index 8ced29f..2e63e76 100644 --- a/sys/kern/sys_pipe.c +++ b/sys/kern/sys_pipe.c @@ -1041,7 +1041,7 @@ pipe_write(fp, uio, active_cred, flags, td) if ((space < uio->uio_resid) && (orig_resid <= PIPE_BUF)) space = 0; - if (space > 0 && (wpipe->pipe_buffer.cnt < PIPE_SIZE)) { + if (space > 0) { if ((error = pipelock(wpipe,1)) == 0) { int size; /* Transfer size */ int segsize; /* first segment to transfer */ |
