/* * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ #include <SYS.h> .data .private_extern __current_pid __current_pid: .long 0 /* * If __current_pid is > 0, return it, else make syscall. * If __current_pid is 0, cache result of syscall. */ TEXT LEAF(_getpid, 0) movl __current_pid(%rip), %eax testl %eax, %eax jle 1f ret 1: UNIX_SYSCALL_NONAME(getpid, 0) movl %eax, %edx xorl %eax, %eax leaq __current_pid(%rip), %rcx lock cmpxchgl %edx, (%rcx) movl %edx, %eax ret