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* [newlib-cygwin] Cygwin: FIFO: improve the interruptibility of raw_read
@ 2020-05-11 13:55 Ken Brown
0 siblings, 0 replies; only message in thread
From: Ken Brown @ 2020-05-11 13:55 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e637d5361782f0bb911f62355a331aa6098b0058
commit e637d5361782f0bb911f62355a331aa6098b0058
Author: Ken Brown <kbrown@cornell.edu>
Date: Mon May 11 09:03:37 2020 -0400
Cygwin: FIFO: improve the interruptibility of raw_read
During a blocking read, we sleep for 1 ms after each iteration through
the connected writers. Currently we do this by calling Sleep (1).
Remove this call to Sleep and instead change the timeout in the
cygwait call from 0 to 1, so that raw_read can be interrupted while
sleeping.
Diff:
---
winsup/cygwin/fhandler_fifo.cc | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/winsup/cygwin/fhandler_fifo.cc b/winsup/cygwin/fhandler_fifo.cc
index 9cc00d5e7..e8a05dfbf 100644
--- a/winsup/cygwin/fhandler_fifo.cc
+++ b/winsup/cygwin/fhandler_fifo.cc
@@ -1335,8 +1335,8 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
}
else
{
- /* Allow interruption. */
- DWORD waitret = cygwait (NULL, cw_nowait, cw_cancel | cw_sig_eintr);
+ /* Allow interruption and don't hog the CPU. */
+ DWORD waitret = cygwait (NULL, 1, cw_cancel | cw_sig_eintr);
if (waitret == WAIT_CANCELED)
pthread::static_cancel_self ();
else if (waitret == WAIT_SIGNALED)
@@ -1356,8 +1356,6 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
set_errno (EBADF);
goto errout;
}
- /* Don't hog the CPU. */
- Sleep (1);
}
errout:
len = (size_t) -1;
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