| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See http://swift.org/LICENSE.txt for license information |
| // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| |
| #if os(OSX) || os(iOS) |
| import Darwin |
| #elseif os(Linux) |
| import Glibc |
| #endif |
| |
| #if os(OSX) || os(iOS) |
| fileprivate let _NSPageSize = Int(vm_page_size) |
| #elseif os(Linux) || os(Android) |
| fileprivate let _NSPageSize = Int(getpagesize()) |
| #endif |
| |
| public func NSPageSize() -> Int { |
| return _NSPageSize |
| } |
| |
| public func NSRoundUpToMultipleOfPageSize(_ size: Int) -> Int { |
| let ps = NSPageSize() |
| return (size + ps - 1) & ~(ps - 1) |
| } |
| |
| public func NSRoundDownToMultipleOfPageSize(_ size: Int) -> Int { |
| return size & ~(NSPageSize() - 1) |
| } |
| |
| |
| func NSCopyMemoryPages(_ source: UnsafeRawPointer, _ dest: UnsafeMutableRawPointer, _ bytes: Int) { |
| #if os(OSX) || os(iOS) |
| if vm_copy(mach_task_self_, vm_address_t(bitPattern: source), vm_size_t(bytes), vm_address_t(bitPattern: dest)) != KERN_SUCCESS { |
| memmove(dest, source, bytes) |
| } |
| #else |
| memmove(dest, source, bytes) |
| #endif |
| } |
