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Pre-fill buffer at start of read, to avoid the select if unnecessary.

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This commit is contained in:
Mike Purvis 2013-11-18 11:25:25 -05:00
parent c3855adbb0
commit a9bf8d804d
1 changed files with 8 additions and 0 deletions
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8
src/impl/unix.cc
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@ -469,6 +469,14 @@ Serial::SerialImpl::read (uint8_t *buf, size_t size)
total_timeout_ms += timeout_.read_timeout_multiplier * static_cast<long> (size);
MillisecondTimer total_timeout(total_timeout_ms);
// Pre-fill buffer with available bytes
{
ssize_t bytes_read_now = ::read (fd_, buf, size);
if (bytes_read_now > 0) {
bytes_read = bytes_read_now;
}
}
while (bytes_read < size) {
int64_t timeout_remaining_ms = total_timeout.remaining();
if (timeout_remaining_ms <= 0) {