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Remove test in pipe_write() which causes write(2) to return EAGAIN

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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
This commit is contained in:
Pierre Beyssac 2003-07-30 22:50:37 +00:00
parent cc2185305b
commit ae9fcf4c66
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=118230
1 changed files with 1 additions and 1 deletions
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sys/kern/sys_pipe.c
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@ -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 */