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+Process id
+
+Can be used as an integer type by simple casting. For example:
+
+```
+use sysinfo::{PidExt, Pid};
+
+// 0's type will be different depending on the platform!
+let p = Pid::from(0);
+
+// For something more "general":
+let p = Pid::from_u32(0);
+let i: u32 = p.as_u32();
+```
+
+On glibc systems this is a glibc [`pid_t`](https://www.gnu.org/software/libc/manual/html_node/Process-Identification.html).
+
+On Windows systems this is a [`usize` and represents a windows process identifier](https://docs.microsoft.com/en-us/windows/win32/procthread/process-handles-and-identifiers).
+
+On unsupported systems, this is also a `usize`.