--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.management/macosx/native/libmanagement_ext/UnixOperatingSystem.c	Fri Apr 17 09:40:02 2015 +0200
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "com_sun_management_internal_OperatingSystemImpl.h"
+
+#include <sys/time.h>
+#include <mach/mach.h>
+#include <mach/task_info.h>
+
+#include "jvm.h"
+
+JNIEXPORT jdouble JNICALL
+Java_com_sun_management_internal_OperatingSystemImpl_getSystemCpuLoad0
+(JNIEnv *env, jobject dummy)
+{
+    // This code is influenced by the darwin top source
+
+    kern_return_t kr;
+    mach_msg_type_number_t count;
+    host_cpu_load_info_data_t load;
+
+    static jlong last_used  = 0;
+    static jlong last_total = 0;
+
+    count = HOST_CPU_LOAD_INFO_COUNT;
+    kr = host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO, (host_info_t)&load, &count);
+    if (kr != KERN_SUCCESS) {
+        return -1;
+    }
+
+    jlong used  = load.cpu_ticks[CPU_STATE_USER] + load.cpu_ticks[CPU_STATE_NICE] + load.cpu_ticks[CPU_STATE_SYSTEM];
+    jlong total = used + load.cpu_ticks[CPU_STATE_IDLE];
+
+    if (last_used == 0 || last_total == 0) {
+        // First call, just set the last values
+        last_used  = used;
+        last_total = total;
+        // return 0 since we have no data, not -1 which indicates error
+        return 0;
+    }
+
+    jlong used_delta  = used - last_used;
+    jlong total_delta = total - last_total;
+
+    jdouble cpu = (jdouble) used_delta / total_delta;
+
+    last_used  = used;
+    last_total = total;
+
+    return cpu;
+}
+
+
+#define TIME_VALUE_TO_TIMEVAL(a, r) do {  \
+     (r)->tv_sec = (a)->seconds;          \
+     (r)->tv_usec = (a)->microseconds;    \
+} while (0)
+
+
+#define TIME_VALUE_TO_MICROSECONDS(TV) \
+     ((TV).tv_sec * 1000 * 1000 + (TV).tv_usec)
+
+
+JNIEXPORT jdouble JNICALL
+Java_com_sun_management_internal_OperatingSystemImpl_getProcessCpuLoad0
+(JNIEnv *env, jobject dummy)
+{
+    // This code is influenced by the darwin top source
+
+    struct task_basic_info_64 task_info_data;
+    struct task_thread_times_info thread_info_data;
+    struct timeval user_timeval, system_timeval, task_timeval;
+    struct timeval now;
+    mach_port_t task = mach_task_self();
+    kern_return_t kr;
+
+    static jlong last_task_time = 0;
+    static jlong last_time      = 0;
+
+    mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
+    kr = task_info(task,
+            TASK_THREAD_TIMES_INFO,
+            (task_info_t)&thread_info_data,
+            &thread_info_count);
+    if (kr != KERN_SUCCESS) {
+        // Most likely cause: |task| is a zombie.
+        return -1;
+    }
+
+    mach_msg_type_number_t count = TASK_BASIC_INFO_64_COUNT;
+    kr = task_info(task,
+            TASK_BASIC_INFO_64,
+            (task_info_t)&task_info_data,
+            &count);
+    if (kr != KERN_SUCCESS) {
+        // Most likely cause: |task| is a zombie.
+        return -1;
+    }
+
+    /* Set total_time. */
+    // thread info contains live time...
+    TIME_VALUE_TO_TIMEVAL(&thread_info_data.user_time, &user_timeval);
+    TIME_VALUE_TO_TIMEVAL(&thread_info_data.system_time, &system_timeval);
+    timeradd(&user_timeval, &system_timeval, &task_timeval);
+
+    // ... task info contains terminated time.
+    TIME_VALUE_TO_TIMEVAL(&task_info_data.user_time, &user_timeval);
+    TIME_VALUE_TO_TIMEVAL(&task_info_data.system_time, &system_timeval);
+    timeradd(&user_timeval, &task_timeval, &task_timeval);
+    timeradd(&system_timeval, &task_timeval, &task_timeval);
+
+    if (gettimeofday(&now, NULL) < 0) {
+       return -1;
+    }
+    jint ncpus      = JVM_ActiveProcessorCount();
+    jlong time      = TIME_VALUE_TO_MICROSECONDS(now) * ncpus;
+    jlong task_time = TIME_VALUE_TO_MICROSECONDS(task_timeval);
+
+    if ((last_task_time == 0) || (last_time == 0)) {
+        // First call, just set the last values.
+        last_task_time = task_time;
+        last_time      = time;
+        // return 0 since we have no data, not -1 which indicates error
+        return 0;
+    }
+
+    jlong task_time_delta = task_time - last_task_time;
+    jlong time_delta      = time - last_time;
+    if (time_delta == 0) {
+        return -1;
+    }
+
+    jdouble cpu = (jdouble) task_time_delta / time_delta;
+
+    last_task_time = task_time;
+    last_time      = time;
+
+    return cpu;
+ }