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auto merge of #4927 : Ms2ger/servo/mem, r=jdm

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bors-servo 2015-02-13 09:48:54 -07:00
commit 52fc01ad37
1 changed files with 18 additions and 10 deletions
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28
components/util/memory.rs
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@ -10,7 +10,6 @@ use std::ffi::CString;
use std::old_io::timer::sleep;
#[cfg(target_os="linux")]
use std::old_io::File;
use std::mem;
use std::mem::size_of;
#[cfg(target_os="linux")]
use std::env::page_size;
@ -213,16 +212,25 @@ fn get_jemalloc_stat(value_name: &str) -> Option<u64> {
let value_ptr = &mut value as *mut _ as *mut c_void;
let mut value_len = size_of::<size_t>() as size_t;
let mut rv: c_int;
unsafe {
// Using the same values for the `old` and `new` parameters is enough
// to get the statistics updated.
rv = je_mallctl(epoch_c_name.as_ptr(), epoch_ptr, &mut epoch_len, epoch_ptr, epoch_len);
if rv == 0 {
rv = je_mallctl(value_c_name.as_ptr(), value_ptr, &mut value_len, null_mut(), 0);
}
// Using the same values for the `old` and `new` parameters is enough
// to get the statistics updated.
let rv = unsafe {
je_mallctl(epoch_c_name.as_ptr(), epoch_ptr, &mut epoch_len, epoch_ptr,
epoch_len)
};
if rv != 0 {
return None;
}
if rv == 0 { Some(value as u64) } else { None }
let rv = unsafe {
je_mallctl(value_c_name.as_ptr(), value_ptr, &mut value_len,
null_mut(), 0)
};
if rv != 0 {
return None;
}
Some(value as u64)
}
// Like std::macros::try!, but for Option<>.