37 lines
1.3 KiB
Rust
37 lines
1.3 KiB
Rust
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use raw_sync::{events::*, Timeout};
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use shared_memory::*;
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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env_logger::init();
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// Attempt to create a mapping or open if it already exists
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println!("Getting the shared memory mapping");
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let shmem = match ShmemConf::new().size(4096).flink("event_mapping").create() {
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Ok(m) => m,
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Err(ShmemError::LinkExists) => ShmemConf::new().flink("event_mapping").open()?,
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Err(e) => return Err(Box::new(e)),
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};
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if shmem.is_owner() {
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//Create an event in the shared memory
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println!("Creating event in shared memory");
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let (evt, used_bytes) = unsafe { Event::new(shmem.as_ptr(), true)? };
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println!("\tUsed {} bytes", used_bytes);
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println!("Launch another instance of this example to signal the event !");
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evt.wait(Timeout::Infinite)?;
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println!("\tGot signal !");
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} else {
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// Open existing event
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println!("Openning event from shared memory");
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let (evt, used_bytes) = unsafe { Event::from_existing(shmem.as_ptr())? };
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println!("\tEvent uses {} bytes", used_bytes);
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println!("Signaling event !");
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evt.set(EventState::Signaled)?;
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println!("\tSignaled !");
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}
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println!("Done !");
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Ok(())
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}
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