sysinfo 0.26.4

Library to get system information such as processes, CPUs, disks, components and networks
Documentation 
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// Take a look at the license at the top of the repository in the LICENSE file.

use core_foundation_sys::base::CFRelease;

// A helper using to auto release the resource got from CoreFoundation.
// More information about the ownership policy for CoreFoundation pelease refer the link below:
// https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-CJBEJBHH
#[repr(transparent)]
pub(crate) struct CFReleaser<T>(*const T);

impl<T> CFReleaser<T> {
    pub(crate) fn new(ptr: *const T) -> Option<Self> {
        if ptr.is_null() {
            None
        } else {
            Some(Self(ptr))
        }
    }

    pub(crate) fn inner(&self) -> *const T {
        self.0
    }
}

impl<T> Drop for CFReleaser<T> {
    fn drop(&mut self) {
        if !self.0.is_null() {
            unsafe { CFRelease(self.0 as _) }
        }
    }
}

unsafe impl<T> Send for CFReleaser<T> {}
unsafe impl<T> Sync for CFReleaser<T> {}