/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "mysys_priv.h" #ifdef HAVE_SYS_MMAN_H /* system msync() only syncs mmap'ed area to fs cache. fsync() is required to really sync to disc */ int my_msync(int fd, void *addr, size_t len, int flags) { msync(addr, len, flags); return my_sync(fd, MYF(0)); } #else #ifdef __WIN__ static SECURITY_ATTRIBUTES mmap_security_attributes= {sizeof(SECURITY_ATTRIBUTES), 0, TRUE}; int my_getpagesize(void) { SYSTEM_INFO si; GetSystemInfo(&si); return si.dwPageSize; } void *my_mmap(void *addr, size_t len, int prot, int flags, int fd, my_off_t offset) { DWORD flProtect=0; HANDLE hFileMap; LPVOID ptr; flProtect|=SEC_COMMIT; hFileMap=CreateFileMapping(fd, NULL, &mmap_security_attributes, PAGE_READWRITE, 0, len, 0); if (hFileMap == 0) return MAP_FAILED; ptr=MapViewOfFile(hFileMap, flags & PROT_WRITE ? FILE_MAP_WRITE : FILE_MAP_READ, (DWORD)(offset >> 32), (DWORD)offset, len); /* MSDN explicitly states that it's possible to close File Mapping Object even when a view is not unmapped - then the object will be held open implicitly until unmap, as every view stores internally a handler of a corresponding File Mapping Object */ CloseHandle(hFileMap); if (ptr) return ptr; return MAP_FAILED; } int my_munmap(void *addr, size_t len) { return UnmapViewOfFile(addr) ? 0 : -1; } int my_msync(int fd, void *addr, size_t len, int flags) { return FlushViewOfFile(addr, len) ? 0 : -1; } #endif #ifdef _WINDOWS #pragma message "no mmap!" #else #warning "no mmap!" #endif #endif