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use core::{marker::PhantomData, num::NonZeroUsize};
use crate::kernel::{cfg::CfgBuilder, mutex, utils::CpuLockCell, wait, Port};
impl<System: Port> mutex::Mutex<System> {
pub const fn build() -> CfgMutexBuilder<System> {
CfgMutexBuilder::new()
}
}
#[must_use = "must call `finish()` to complete registration"]
pub struct CfgMutexBuilder<System> {
protocol: mutex::MutexProtocol,
_phantom: PhantomData<System>,
}
impl<System: Port> CfgMutexBuilder<System> {
const fn new() -> Self {
Self {
protocol: mutex::MutexProtocol::None,
_phantom: PhantomData,
}
}
pub const fn protocol(self, protocol: mutex::MutexProtocol) -> Self {
Self { protocol, ..self }
}
pub const fn finish(self, cfg: &mut CfgBuilder<System>) -> mutex::Mutex<System> {
let inner = &mut cfg.inner;
inner.mutexes.push(CfgBuilderMutex {
protocol: self.protocol,
});
unsafe { mutex::Mutex::from_id(NonZeroUsize::new_unchecked(inner.mutexes.len())) }
}
}
#[doc(hidden)]
#[derive(Copy, Clone)]
pub struct CfgBuilderMutex {
protocol: mutex::MutexProtocol,
}
impl CfgBuilderMutex {
pub const fn to_state<System: Port>(&self) -> mutex::MutexCb<System> {
mutex::MutexCb {
ceiling: match self.protocol {
mutex::MutexProtocol::None => None,
mutex::MutexProtocol::Ceiling(ceiling) => {
if ceiling < System::NUM_TASK_PRIORITY_LEVELS {
Some(System::TASK_PRIORITY_LEVELS[ceiling])
} else {
panic!(
"mutex's priority ceiling must be less than `num_task_priority_levels`"
);
}
}
},
inconsistent: CpuLockCell::new(false),
wait_queue: wait::WaitQueue::new(wait::QueueOrder::TaskPriority),
prev_mutex_held: CpuLockCell::new(None),
owning_task: CpuLockCell::new(None),
}
}
}