SpawnError

pub const SpawnError = error{
    /// A system-imposed limit on the number of threads was encountered.
    /// There are a number of limits that may trigger this error:
    /// *  the  RLIMIT_NPROC soft resource limit (set via setrlimit(2)),
    ///    which limits the number of processes and threads for  a  real
    ///    user ID, was reached;
    /// *  the kernel's system-wide limit on the number of processes and
    ///    threads,  /proc/sys/kernel/threads-max,  was   reached   (see
    ///    proc(5));
    /// *  the  maximum  number  of  PIDs, /proc/sys/kernel/pid_max, was
    ///    reached (see proc(5)); or
    /// *  the PID limit (pids.max) imposed by the cgroup "process  num‐
    ///    ber" (PIDs) controller was reached.
    ThreadQuotaExceeded,

    /// The kernel cannot allocate sufficient memory to allocate a task structure
    /// for the child, or to copy those parts of the caller's context that need to
    /// be copied.
    SystemResources,

    /// Not enough userland memory to spawn the thread.
    OutOfMemory,

    /// `mlockall` is enabled, and the memory needed to spawn the thread
    /// would exceed the limit.
    LockedMemoryLimitExceeded,

    Unexpected,
}