32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
Rust
//! Resource utilities
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use crate::error;
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/// Returns the user and system CPU time used by the current process;
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/// expressed as a tuple containing user time and system time, in that order.
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pub fn get_self_user_and_system_time()
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-> Result<(std::time::Duration, std::time::Duration), error::Error> {
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let usage = nix::sys::resource::getrusage(nix::sys::resource::UsageWho::RUSAGE_SELF)?;
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Ok((
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convert_rusage_time(usage.user_time()),
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convert_rusage_time(usage.system_time()),
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))
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}
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/// Returns the user and system CPU time used by child processes; expressed
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/// as a tuple containing user time and system time, in that order.
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pub fn get_children_user_and_system_time()
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-> Result<(std::time::Duration, std::time::Duration), error::Error> {
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let usage = nix::sys::resource::getrusage(nix::sys::resource::UsageWho::RUSAGE_CHILDREN)?;
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Ok((
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convert_rusage_time(usage.user_time()),
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convert_rusage_time(usage.system_time()),
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))
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}
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const fn convert_rusage_time(time: nix::sys::time::TimeVal) -> std::time::Duration {
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#[allow(clippy::cast_sign_loss)]
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#[allow(clippy::cast_possible_truncation)]
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std::time::Duration::new(time.tv_sec() as u64, time.tv_usec() as u32 * 1000)
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}
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