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//! https://github.com/gperftools/gperftools
use std::{
ffi::CString,
os::raw::c_char,
path::Path,
sync::atomic::{AtomicUsize, Ordering},
};
#[link(name = "profiler")]
#[allow(non_snake_case)]
extern "C" {
fn ProfilerStart(fname: *const c_char) -> i32;
fn ProfilerStop();
}
static PROFILER_STATE: AtomicUsize = AtomicUsize::new(OFF);
const OFF: usize = 0;
const ON: usize = 1;
const PENDING: usize = 2;
pub fn start(path: &Path) {
if PROFILER_STATE.compare_and_swap(OFF, PENDING, Ordering::SeqCst) != OFF {
panic!("profiler already started");
}
let path = CString::new(path.display().to_string()).unwrap();
if unsafe { ProfilerStart(path.as_ptr()) } == 0 {
panic!("profiler failed to start")
}
assert!(PROFILER_STATE.compare_and_swap(PENDING, ON, Ordering::SeqCst) == PENDING);
}
pub fn stop() {
if PROFILER_STATE.compare_and_swap(ON, PENDING, Ordering::SeqCst) != ON {
panic!("profiler is not started")
}
unsafe { ProfilerStop() };
assert!(PROFILER_STATE.compare_and_swap(PENDING, OFF, Ordering::SeqCst) == PENDING);
}
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