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8243491: Implementation of Foreign-Memory Access API (Second Incubator)

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Upstream latest changes of the Foreign-Memory Access API

Co-authored-by: Jorn Vernee <jorn.vernee@oracle.com>
Co-authored-by: Mandy Chung <mandy.chung@oracle.com>
Co-authored-by: Paul Sandoz <paul.sandoz@oracle.com>
Co-authored-by: Peter Levart <peter.levart@gmail.com>
Reviewed-by: chegar, psandoz
This commit is contained in:
Chris Hegarty 2020-05-25 10:54:39 +01:00 • committed by Maurizio Cimadamore
parent 9b94b9d1a1
commit f3eb44a94d
94 changed files with 7496 additions and 1388 deletions
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127
src/java.base/unix/native/libnio/MappedByteBuffer.c
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@ -1,127 +0,0 @@
/*
* Copyright (c) 2001, 2010, 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 "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include "java_nio_MappedByteBuffer.h"
#include <assert.h>
#include <sys/mman.h>
#include <stddef.h>
#include <stdlib.h>
#ifdef _AIX
#include <unistd.h>
#endif
/* Output type for mincore(2) */
#ifdef __linux__
typedef unsigned char mincore_vec_t;
#else
typedef char mincore_vec_t;
#endif
#ifdef _AIX
static long calculate_number_of_pages_in_range(void* address, size_t len, size_t pagesize) {
uintptr_t address_unaligned = (uintptr_t) address;
uintptr_t address_aligned = address_unaligned & (~(pagesize - 1));
size_t len2 = len + (address_unaligned - address_aligned);
long numPages = (len2 + pagesize - 1) / pagesize;
return numPages;
}
#endif
JNIEXPORT jboolean JNICALL
Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address,
jlong len, jint numPages)
{
jboolean loaded = JNI_TRUE;
int result = 0;
int i = 0;
void *a = (void *) jlong_to_ptr(address);
mincore_vec_t* vec = NULL;
#ifdef _AIX
/* See JDK-8186665 */
size_t pagesize = (size_t)sysconf(_SC_PAGESIZE);
if ((long)pagesize == -1) {
return JNI_FALSE;
}
numPages = (jint) calculate_number_of_pages_in_range(a, len, pagesize);
#endif
/* Include space for one sentinel byte at the end of the buffer
* to catch overflows. */
vec = (mincore_vec_t*) malloc(numPages + 1);
if (vec == NULL) {
JNU_ThrowOutOfMemoryError(env, NULL);
return JNI_FALSE;
}
vec[numPages] = '\x7f'; /* Write sentinel. */
result = mincore(a, (size_t)len, vec);
assert(vec[numPages] == '\x7f'); /* Check sentinel. */
if (result == -1) {
JNU_ThrowIOExceptionWithLastError(env, "mincore failed");
free(vec);
return JNI_FALSE;
}
for (i=0; i<numPages; i++) {
if (vec[i] == 0) {
loaded = JNI_FALSE;
break;
}
}
free(vec);
return loaded;
}
JNIEXPORT void JNICALL
Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address,
jlong len)
{
char *a = (char *)jlong_to_ptr(address);
int result = madvise((caddr_t)a, (size_t)len, MADV_WILLNEED);
if (result == -1) {
JNU_ThrowIOExceptionWithLastError(env, "madvise failed");
}
}
JNIEXPORT void JNICALL
Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo,
jlong address, jlong len)
{
void* a = (void *)jlong_to_ptr(address);
int result = msync(a, (size_t)len, MS_SYNC);
if (result == -1) {
JNU_ThrowIOExceptionWithLastError(env, "msync failed");
}
}