88 lines
2.5 KiB
Rust
88 lines
2.5 KiB
Rust
// Rust Bitcoin Library
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// Written in 2014 by
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// Andrew Poelstra <apoelstra@wpsoftware.net>
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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//! # Macros
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//!
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//! Macros available to users of the Bitcoin library
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#![macro_escape]
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#[macro_export]
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macro_rules! nu_select(
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($($name:pat from $rx:expr => $code:expr),+) => ({
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nu_select!{ $($name from $rx using recv => $code),+ }
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});
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($($name:pat from $rx:expr using $meth:ident => $code:expr),+) => ({
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use rustrt::local::Local;
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use rustrt::task::Task;
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use sync::comm::Packet;
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// Is anything already ready to receive? Grab it without waiting.
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$(
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if (&$rx as &Packet).can_recv() {
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let $name = $rx.$meth();
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$code
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}
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)else+
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else {
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// Start selecting on as many as we need to before getting a bite.
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// Keep count of how many, since we need to abort every selection
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// that we started.
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let mut started_count = 0;
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// Restrict lifetime of borrows in `packets`
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{
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let packets = [ $( &$rx as &Packet, )+ ];
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let task: Box<Task> = Local::take();
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task.deschedule(packets.len(), |task| {
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match packets[started_count].start_selection(task) {
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Ok(()) => {
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started_count += 1;
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Ok(())
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}
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Err(task) => Err(task)
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}
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});
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}
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let mut i = 0;
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let ret = $(
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// Abort the receivers, stopping at the first ready one to get its data.
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if { i += 1; i <= started_count } &&
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// If start_selection() failed, abort_selection() will fail too,
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// but it still counts as "data available".
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($rx.abort_selection() || i == started_count) {
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// React to the first
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let $name = $rx.$meth();
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$code
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})else+
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else {
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fail!("we didn't find the ready receiver, but we should have had one");
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};
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// At this point, the first i receivers have been aborted. We need to abort the rest:
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$(if i > 0 {
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i -= 1;
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} else {
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$rx.abort_selection();
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})+
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let _ = i; // Shut up `i -= 1 but i is never read` warning
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// Return
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ret
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}
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})
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)
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