github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/common/fdlimit/fdlimit_windows.go

// This file is part of the go-sberex library. The go-sberex library is 
// free software: you can redistribute it and/or modify it under the terms 
// of the GNU Lesser General Public License as published by the Free 
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// The go-sberex library is distributed in the hope that it will be useful, 
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
// General Public License <http://www.gnu.org/licenses/> for more details.

package fdlimit

import "errors"

// Raise tries to maximize the file descriptor allowance of this process
// to the maximum hard-limit allowed by the OS.
func Raise(max uint64) error {
	// This method is NOP by design:
	//  * Linux/Darwin counterparts need to manually increase per process limits
	//  * On Windows Go uses the CreateFile API, which is limited to 16K files, non
	//    changeable from within a running process
	// This way we can always "request" raising the limits, which will either have
	// or not have effect based on the platform we're running on.
	if max > 16384 {
		return errors.New("file descriptor limit (16384) reached")
	}
	return nil
}

// Current retrieves the number of file descriptors allowed to be opened by this
// process.
func Current() (int, error) {
	// Please see Raise for the reason why we use hard coded 16K as the limit
	return 16384, nil
}

// Maximum retrieves the maximum number of file descriptors this process is
// allowed to request for itself.
func Maximum() (int, error) {
	return Current()
}