Determine the number of benchmarking libsets based on the number of preallocated stacks

This eases benchmark debugging by cutting out a redundant tunable.

Author: solb

benches/inger.rs

@@ -3,22 +3,22 @@ extern crate bencher;
 extern crate inger;
 
 use bencher::Bencher;
+use inger::STACK_N_PREALLOC;
 use inger::nsnow;
 use inger::pause;
 use std::fs::File;
 use std::io::Write;
 use std::sync::atomic::AtomicU64;
 use std::sync::atomic::Ordering;
 
-const LIBSETS: usize = 511;
+const LIBSETS: usize = STACK_N_PREALLOC;
 
 benchmark_group![bench, launch, resume, renew];
 
 fn launch(lo: &mut Bencher) {
 	use inger::launch;
 	use inger::resume;
 	use std::mem::MaybeUninit;
-
 	let mut lingers: [MaybeUninit<_>; LIBSETS] = unsafe {
 		MaybeUninit::uninit().assume_init()
 	};

src/lib.rs

@@ -20,7 +20,8 @@ pub use linger::*;
 
 const QUANTUM_MICROSECS: u64  = 100;
 
-const STACK_N_PREALLOC: usize = 511;
+#[doc(hidden)]
+pub const STACK_N_PREALLOC: usize = 511;
 const STACK_SIZE_BYTES: usize = 2 * 1_024 * 1_024;
 
 #[cfg(test)]