87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr_arch_file_io.h"
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APR_DECLARE(apr_status_t) apr_file_lock(apr_file_t *thefile, int type)
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{
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#ifdef _WIN32_WCE
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/* The File locking is unsuported on WCE */
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return APR_ENOTIMPL;
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#else
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const DWORD len = 0xffffffff;
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DWORD flags;
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flags = ((type & APR_FLOCK_NONBLOCK) ? LOCKFILE_FAIL_IMMEDIATELY : 0)
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+ (((type & APR_FLOCK_TYPEMASK) == APR_FLOCK_SHARED)
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? 0 : LOCKFILE_EXCLUSIVE_LOCK);
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if (apr_os_level >= APR_WIN_NT) {
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/* Syntax is correct, len is passed for LengthLow and LengthHigh*/
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OVERLAPPED offset;
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memset (&offset, 0, sizeof(offset));
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if (!LockFileEx(thefile->filehand, flags, 0, len, len, &offset))
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return apr_get_os_error();
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}
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else {
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/* On Win9x, LockFile() never blocks. Hack in a crufty poll.
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*
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* Note that this hack exposes threads to being unserviced forever,
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* in the situation that the given lock has low availability.
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* When implemented in the kernel, LockFile will typically use
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* FIFO or round robin distribution to ensure all threads get
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* one crack at the lock; but in this case we can't emulate that.
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*
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* However Win9x are barely maintainable anyways, if the user does
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* choose to build to them, this is the best we can do.
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*/
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while (!LockFile(thefile->filehand, 0, 0, len, 0)) {
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DWORD err = GetLastError();
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if ((err == ERROR_LOCK_VIOLATION) && !(type & APR_FLOCK_NONBLOCK))
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{
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Sleep(500); /* pause for a half second */
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continue; /* ... and then poll again */
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}
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return APR_FROM_OS_ERROR(err);
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}
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}
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return APR_SUCCESS;
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#endif /* !defined(_WIN32_WCE) */
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}
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APR_DECLARE(apr_status_t) apr_file_unlock(apr_file_t *thefile)
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{
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#ifdef _WIN32_WCE
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return APR_ENOTIMPL;
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#else
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DWORD len = 0xffffffff;
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if (apr_os_level >= APR_WIN_NT) {
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/* Syntax is correct, len is passed for LengthLow and LengthHigh*/
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OVERLAPPED offset;
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memset (&offset, 0, sizeof(offset));
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if (!UnlockFileEx(thefile->filehand, 0, len, len, &offset))
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return apr_get_os_error();
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}
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else {
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if (!UnlockFile(thefile->filehand, 0, 0, len, 0))
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return apr_get_os_error();
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}
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return APR_SUCCESS;
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#endif /* !defined(_WIN32_WCE) */
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}
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