// Copyright (c) 2019-2024 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.

module runtime

import os

// nr_jobs returns the same as `nr_cpus`, but influenced by the env variable `VJOBS`.
// If the environment variable `VJOBS` is set, and has a value > 0,
// then `nr_jobs` will return that number instead.
// This is useful for runtime tweaking of e.g. threaded or concurrent code.
pub fn nr_jobs() int {
    $if cross ? {
        // A single thread is *more likely* to work consistently everywhere during bootstrapping.
        // NB: the compiler itself uses runtime.nr_jobs() and sync.pool to process things in parallel
        // in its cgen stage. Returning 1 here, increases the chances of it working on non linux systems.
        return 1
    }
    mut cpus := nr_cpus()
    // allow for overrides, for example using `VJOBS=32 ./v test .`
    vjobs := os.getenv('VJOBS').int()
    if vjobs > 0 {
        cpus = vjobs
    }
    if cpus == 0 {
        return 1
    }
    return cpus
}

// is_32bit returns true if the current executable is running on a 32 bit system.
pub fn is_32bit() bool {
    $if x32 {
        return true
    }
    return false
}

// is_64bit returns true if the current executable is running on a 64 bit system.
pub fn is_64bit() bool {
    $if x64 {
        return true
    }
    return false
}

// is_little_endian returns true if the current executable is running on a little-endian system.
pub fn is_little_endian() bool {
    $if little_endian {
        return true
    }
    return false
}

// is_big_endian returns true if the current executable is running on a big-endian system.
pub fn is_big_endian() bool {
    $if big_endian {
        return true
    }
    return false
}