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Cider Isn't Darwin Emulation, Really
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136/* * Copyright (c) 2006 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@ */
#include <errno.h>#include <libkern/OSMemoryNotification.h>#include <mach/mach.h>#include <notify.h>#include <stdlib.h>#include <sys/time.h>#include <dispatch/dispatch.h>#include <dispatch/private.h>
const char *kOSMemoryNotificationName = "com.apple.system.memorystatus";
struct _OSMemoryNotification { int token; mach_port_t port;};
intOSMemoryNotificationCreate(OSMemoryNotificationRef *note){ OSMemoryNotificationRef ref = malloc(sizeof(struct _OSMemoryNotification));
if (NULL == ref) { return ENOMEM; } if (NOTIFY_STATUS_OK != notify_register_mach_port(kOSMemoryNotificationName, &ref->port, 0, &ref->token)) return ENOMEM;
*note = ref;
return 0;}
intOSMemoryNotificationDestroy(OSMemoryNotificationRef note){ if (NOTIFY_STATUS_OK != notify_cancel(note->token)) return EINVAL;
if (KERN_SUCCESS != mach_port_deallocate(mach_task_self(), note->port)) return EINVAL;
free(note);
return 0;} intOSMemoryNotificationWait(OSMemoryNotificationRef note, OSMemoryNotificationLevel *level){ return OSMemoryNotificationTimedWait(note, level, NULL);}
static mach_msg_timeout_tabs_to_timeout(const struct timeval *abstime){ struct timeval rel, now;
gettimeofday(&now, NULL);
rel.tv_usec = abstime->tv_usec - now.tv_usec; rel.tv_sec = abstime->tv_sec - now.tv_sec; if (rel.tv_usec < 0) { rel.tv_usec += 1000000; rel.tv_sec--; } if (((int)rel.tv_sec < 0) || ((rel.tv_sec == 0) && (rel.tv_usec == 0))) { return 0; } return rel.tv_sec * 1000 + rel.tv_usec / 1000;}
intOSMemoryNotificationTimedWait(OSMemoryNotificationRef note, OSMemoryNotificationLevel *level, const struct timeval *abstime){ dispatch_semaphore_t sema = dispatch_semaphore_create(0); dispatch_retain(sema); dispatch_source_t memoryNotificationSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_VM, 0, DISPATCH_VM_PRESSURE, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)); dispatch_source_set_event_handler(memoryNotificationSource, ^{ dispatch_semaphore_signal(sema); dispatch_release(sema); });
dispatch_resume(memoryNotificationSource); dispatch_time_t waitTime = DISPATCH_TIME_FOREVER; if (abstime) { mach_msg_timeout_t timeout = abs_to_timeout(abstime); waitTime = dispatch_time(DISPATCH_TIME_NOW, timeout * 1e6); } long ret = dispatch_semaphore_wait(sema, waitTime);
dispatch_release(sema); dispatch_release(memoryNotificationSource);
if (ret != 0) { return ETIMEDOUT; } if (level) { *level = OSMemoryNotificationLevelUrgent; } return 0;}
OSMemoryNotificationLevel OSMemoryNotificationCurrentLevel(void){ return OSMemoryNotificationLevelNormal;}