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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.
This commit is contained in:
Ken Brown 2020-05-11 09:03:37 -04:00
parent 1f27345947
commit e637d53617
1 changed files with 2 additions and 4 deletions
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6
winsup/cygwin/fhandler_fifo.cc
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@ -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;