UHD_INLINE bool spin_wait_with_timeout(
std::atomic<T> &cond,
const T value,
const double timeout
){
if (cond == value) return true;
const time_spec_t exit_time = time_spec_t::get_system_time() + time_spec_t(timeout);
while (cond != value) {
if (time_spec_t::get_system_time() > exit_time) {
return false;
}
boost::this_thread::interruption_point();
boost::this_thread::yield();
}
return true;
}
/*******************************************************************
* Send:
* The entry point for the fast-path send calls.
* Dispatch into combinations of single packet send calls.
******************************************************************/
UHD_INLINE size_t send(
const uhd::tx_streamer::buffs_type &buffs,
const size_t nsamps_per_buff,
const uhd::tx_metadata_t &metadata,
const double timeout
){
//translate the metadata to vrt if packet info
vrt::if_packet_info_t if_packet_info;
if_packet_info.has_sid = false;
if_packet_info.has_cid = false;
if_packet_info.has_tlr = false;
if_packet_info.has_tsi = metadata.has_time_spec;
if_packet_info.has_tsf = metadata.has_time_spec;
if_packet_info.tsi = boost::uint32_t(metadata.time_spec.get_full_secs());
if_packet_info.tsf = boost::uint64_t(metadata.time_spec.get_tick_count(_tick_rate));
if_packet_info.sob = metadata.start_of_burst;
if_packet_info.eob = metadata.end_of_burst;
if (nsamps_per_buff <= _max_samples_per_packet){
//TODO remove this code when sample counts of zero are supported by hardware
#ifndef SSPH_DONT_PAD_TO_ONE
if (nsamps_per_buff == 0) return send_one_packet(
_zero_buffs, 1, if_packet_info, timeout
) & 0x0;
#endif
return send_one_packet(buffs, nsamps_per_buff, if_packet_info, timeout);
}
size_t total_num_samps_sent = 0;
//false until final fragment
if_packet_info.eob = false;
const size_t num_fragments = (nsamps_per_buff-1)/_max_samples_per_packet;
const size_t final_length = ((nsamps_per_buff-1)%_max_samples_per_packet)+1;
//loop through the following fragment indexes
for (size_t i = 0; i < num_fragments; i++){
//send a fragment with the helper function
const size_t num_samps_sent = send_one_packet(
buffs, _max_samples_per_packet,
if_packet_info, timeout,
total_num_samps_sent*_bytes_per_cpu_item
);
total_num_samps_sent += num_samps_sent;
if (num_samps_sent == 0) return total_num_samps_sent;
//setup metadata for the next fragment
const time_spec_t time_spec = metadata.time_spec + time_spec_t(0, total_num_samps_sent, _samp_rate);
if_packet_info.tsi = boost::uint32_t(time_spec.get_full_secs());
if_packet_info.tsf = boost::uint64_t(time_spec.get_tick_count(_tick_rate));
if_packet_info.sob = false;
}
//send the final fragment with the helper function
if_packet_info.eob = metadata.end_of_burst;
return total_num_samps_sent + send_one_packet(
buffs, final_length,
if_packet_info, timeout,
total_num_samps_sent*_bytes_per_cpu_item
);
}
