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Handle a signal: Difference between revisions
Add Rust implementation
(→{{header|Wren}}: Slightly simpler.) |
(Add Rust implementation) |
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Line 1,513:
tdelt = Time.now - t1
puts 'Program has run for %5.3f seconds.' % tdelt</lang>
=={{header|Rust}}==
<lang rust>
#[cfg(unix)]
fn main() {
use std::sync::atomic::{AtomicBool, Ordering};
use std::thread;
use std::time::{Duration, Instant};
use libc::{sighandler_t, SIGINT};
// The time between ticks of our counter.
let duration = Duration::from_secs(1) / 2;
// "SIGINT received" global variable.
static mut GOT_SIGINT: AtomicBool = AtomicBool::new(false);
unsafe {
// Initially, "SIGINT received" is false.
GOT_SIGINT.store(false, Ordering::Release);
// Interrupt handler that handles the SIGINT signal
unsafe fn handle_sigint() {
// It is dangerous to perform any system calls in interrupts, so just set the atomic
// "SIGINT received" global to true when it arrives.
GOT_SIGINT.store(true, Ordering::Release);
}
// Make handle_sigint the signal handler for SIGINT.
libc::signal(SIGINT, handle_sigint as sighandler_t);
}
// Get the start time...
let start = Instant::now();
// Integer counter
let mut i = 0u32;
// Every `duration`...
loop {
thread::sleep(duration);
// Break if SIGINT was handled
if unsafe { GOT_SIGINT.load(Ordering::Acquire) } {
break;
}
// Otherwise, increment and display the integer and continue the loop.
i += 1;
println!("{}", i);
}
// Get the elapsed time.
let elapsed = start.elapsed();
// Print the difference and exit
println!("Program has run for {} seconds", elapsed.as_secs());
}
#[cfg(not(unix))]
fn main() {
println!("Not supported on this platform");
}
</lang>
=={{header|Scala}}==
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