2006-03-10 02:45:59 +00:00
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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2008-06-03 03:48:16 +00:00
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* Portions Copyright 2006-2008 Message Systems, Inc.
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2006-03-10 02:45:59 +00:00
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*/
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/* #pragma ident "@(#)vmem_mmap.c 1.2 05/06/08 SMI" */
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#include "config.h"
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#include <errno.h>
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#if HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef HAVE_SYS_SYSMACROS_H
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#include <sys/sysmacros.h>
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#endif
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2006-03-11 17:15:25 +00:00
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#include <unistd.h>
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2006-03-10 02:45:59 +00:00
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#include "vmem_base.h"
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#define ALLOC_PROT PROT_READ | PROT_WRITE | PROT_EXEC
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#define FREE_PROT PROT_NONE
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#define ALLOC_FLAGS MAP_PRIVATE | MAP_ANON
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#define FREE_FLAGS MAP_PRIVATE | MAP_ANON | MAP_NORESERVE
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#ifdef MAP_ALIGN
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#define CHUNKSIZE (64*1024) /* 64 kilobytes */
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#else
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static size_t CHUNKSIZE;
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#endif
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static vmem_t *mmap_heap;
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static void *
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vmem_mmap_alloc(vmem_t *src, size_t size, int vmflags)
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{
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void *ret;
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int old_errno = errno;
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ret = vmem_alloc(src, size, vmflags);
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#ifndef _WIN32
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if (ret != NULL
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&&
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mmap(ret, size, ALLOC_PROT, ALLOC_FLAGS | MAP_FIXED, -1, 0) ==
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MAP_FAILED
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) {
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vmem_free(src, ret, size);
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vmem_reap();
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ASSERT((vmflags & VM_NOSLEEP) == VM_NOSLEEP);
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errno = old_errno;
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return (NULL);
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}
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#endif
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errno = old_errno;
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return (ret);
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}
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static void
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vmem_mmap_free(vmem_t *src, void *addr, size_t size)
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{
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int old_errno = errno;
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#ifdef _WIN32
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VirtualFree(addr, size, MEM_RELEASE);
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#else
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(void) mmap(addr, size, FREE_PROT, FREE_FLAGS | MAP_FIXED, -1, 0);
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#endif
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vmem_free(src, addr, size);
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errno = old_errno;
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}
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static void *
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vmem_mmap_top_alloc(vmem_t *src, size_t size, int vmflags)
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{
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void *ret;
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void *buf;
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int old_errno = errno;
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ret = vmem_alloc(src, size, VM_NOSLEEP);
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if (ret) {
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errno = old_errno;
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return (ret);
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}
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/*
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* Need to grow the heap
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*/
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#ifdef _WIN32
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buf = VirtualAlloc(NULL, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
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2006-10-13 15:54:13 +00:00
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if (buf == NULL) buf = MAP_FAILED;
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2006-03-10 02:45:59 +00:00
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#else
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buf = mmap(
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#ifdef MAP_ALIGN
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(void *)CHUNKSIZE,
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#else
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0,
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#endif
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size, FREE_PROT, FREE_FLAGS
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#ifdef MAP_ALIGN
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| MAP_ALIGN
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#endif
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, -1, 0);
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#endif
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if (buf != MAP_FAILED) {
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ret = _vmem_extend_alloc(src, buf, size, size, vmflags);
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if (ret != NULL)
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return (ret);
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else {
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(void) munmap(buf, size);
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errno = old_errno;
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return (NULL);
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}
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} else {
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/*
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* Growing the heap failed. The allocation above will
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* already have called umem_reap().
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*/
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ASSERT((vmflags & VM_NOSLEEP) == VM_NOSLEEP);
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errno = old_errno;
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return (NULL);
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}
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}
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vmem_t *
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vmem_mmap_arena(vmem_alloc_t **a_out, vmem_free_t **f_out)
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{
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#ifdef _WIN32
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SYSTEM_INFO info;
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size_t pagesize;
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#else
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size_t pagesize = _sysconf(_SC_PAGESIZE);
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#endif
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#ifdef _WIN32
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GetSystemInfo(&info);
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pagesize = info.dwPageSize;
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CHUNKSIZE = info.dwAllocationGranularity;
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#elif !defined(MAP_ALIGN)
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CHUNKSIZE = pagesize;
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#endif
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if (mmap_heap == NULL) {
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mmap_heap = vmem_init("mmap_top",
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CHUNKSIZE,
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vmem_mmap_top_alloc, vmem_free,
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"mmap_heap", NULL, 0, pagesize,
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vmem_mmap_alloc, vmem_mmap_free);
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}
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if (a_out != NULL)
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*a_out = vmem_mmap_alloc;
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if (f_out != NULL)
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*f_out = vmem_mmap_free;
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return (mmap_heap);
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}
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