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use log::{warn, trace};
#[cfg(feature = "tokio-semaphore")]
mod tokio_semaphore;
#[cfg(feature = "tokio-semaphore")]
pub use tokio_semaphore::{
BlockingPermit,
BlockingPermitFuture,
Semaphore,
SyncBlockingPermitFuture,
};
#[cfg(not(feature = "tokio-semaphore"))]
#[cfg(feature = "futures-intrusive")]
mod intrusive;
#[cfg(not(feature = "tokio-semaphore"))]
#[cfg(feature = "futures-intrusive")]
pub use intrusive::{
BlockingPermit,
BlockingPermitFuture,
Semaphore,
SyncBlockingPermitFuture,
};
pub trait Semaphorish {
fn default_new(permits: usize) -> Self;
}
impl<'a> BlockingPermit<'a> {
pub fn enter(&self) {
if self.entered.replace(true) {
panic!("BlockingPermit::enter (or run) called twice!");
}
}
pub fn run<F, T>(self, f: F) -> T
where F: FnOnce() -> T
{
if self.entered.replace(true) {
panic!("BlockingPermit::run (or enter) called twice!");
}
#[cfg(feature="tokio-threaded")] {
tokio::task::block_in_place(f)
}
#[cfg(not(feature="tokio-threaded"))] {
f()
}
}
}
impl<'a> Drop for BlockingPermit<'a> {
fn drop(&mut self) {
if self.entered.get() {
trace!("Dropped BlockingPermit (semaphore)");
} else {
warn!("Dropped BlockingPermit (semaphore) was never entered")
}
}
}
pub fn blocking_permit_future(semaphore: &Semaphore)
-> BlockingPermitFuture<'_>
{
BlockingPermitFuture::new(semaphore)
}