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51 lines
1.7 KiB
Rust
51 lines
1.7 KiB
Rust
// Copyright 2014 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Interface to the measurements in the task_basic_info struct, gathered by
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//! invoking `task_info()` with the `TASK_BASIC_INFO` flavor.
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use libc::{c_int, size_t};
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/// Obtains task_basic_info::virtual_size.
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pub fn virtual_size() -> Option<usize> {
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let mut virtual_size: size_t = 0;
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let rv = unsafe {
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TaskBasicInfoVirtualSize(&mut virtual_size)
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};
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if rv == 0 { Some(virtual_size as usize) } else { None }
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}
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/// Obtains task_basic_info::resident_size.
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pub fn resident_size() -> Option<usize> {
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let mut resident_size: size_t = 0;
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let rv = unsafe {
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TaskBasicInfoResidentSize(&mut resident_size)
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};
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if rv == 0 { Some(resident_size as usize) } else { None }
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}
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extern {
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fn TaskBasicInfoVirtualSize(virtual_size: *mut size_t) -> c_int;
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fn TaskBasicInfoResidentSize(resident_size: *mut size_t) -> c_int;
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_stuff() {
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// In theory these can fail to return a value, but in practice they
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// don't unless something really bizarre has happened with the OS. So
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// assume they succeed. The returned values are non-deterministic, but
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// check they're non-zero as a basic sanity test.
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assert!(virtual_size().unwrap() > 0);
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assert!(resident_size().unwrap() > 0);
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}
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}
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