bsd/sys/kern_memorystatus.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*!
  29         @header kern_memorystatus.h
  30         This header defines a kernel event subclass for the OSMemoryNotification API
  31  */
  32
  33 #ifndef SYS_KERN_MEMORYSTATUS_H
  34 #define SYS_KERN_MEMORYSTATUS_H
  35
  36 /*
  37  * Define Memory Status event subclass.
  38  * Subclass of KEV_SYSTEM_CLASS
  39  */
  40
  41 /*!
  42         @defined KEV_MEMORYSTATUS_SUBCLASS
  43         @discussion The kernel event subclass for memory status events.
  44 */
  45 #define KEV_MEMORYSTATUS_SUBCLASS        3
  46
  47 enum {
  48         kMemoryStatusLevelAny = -1,
  49         kMemoryStatusLevelNormal = 0,
  50         kMemoryStatusLevelWarning = 1,
  51         kMemoryStatusLevelUrgent = 2,
  52         kMemoryStatusLevelCritical = 3
  53 };
  54
  55 #ifdef KERNEL
  56 extern void kern_memorystatus_init(void) __attribute__((section("__TEXT, initcode")));
  57
  58 extern int kern_memorystatus_wakeup;
  59 extern int kern_memorystatus_level;
  60
  61 #endif /* KERNEL */
  62 #endif /* SYS_KERN_MEMORYSTATUS_H */