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/* -*- c-basic-offset: 2 -*- */
/*
Copyright(C) 2017 Brazil
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 2.1 as published by the Free Software Foundation.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*/
#include "grn_file_lock.h"
#include "grn_ctx.h"
#include <sys/stat.h>
#ifdef WIN32
# include <io.h>
# include <share.h>
#else /* WIN32 */
# include <sys/types.h>
# include <fcntl.h>
#endif /* WIN32 */
#ifdef WIN32
# define GRN_FILE_LOCK_IS_INVALID(file_lock) \
((file_lock)->handle == INVALID_HANDLE_VALUE)
#else /* WIN32 */
# define GRN_FILE_LOCK_IS_INVALID(file_lock) \
((file_lock)->fd == -1)
#endif /* WIN32 */
void
grn_file_lock_init(grn_ctx *ctx,
grn_file_lock *file_lock,
const char *path)
{
file_lock->path = path;
#ifdef WIN32
file_lock->handle = INVALID_HANDLE_VALUE;
#else /* WIN32 */
file_lock->fd = -1;
#endif /* WIN32 */
}
grn_bool
grn_file_lock_acquire(grn_ctx *ctx,
grn_file_lock *file_lock,
int timeout,
const char *error_message_tag)
{
int i;
int n_lock_tries = timeout;
if (!file_lock->path) {
return GRN_TRUE;
}
for (i = 0; i < n_lock_tries; i++) {
#ifdef WIN32
file_lock->handle = CreateFile(file_lock->path,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
#else /* WIN32 */
file_lock->fd = open(file_lock->path, O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
#endif
if (!GRN_FILE_LOCK_IS_INVALID(file_lock)) {
break;
}
grn_nanosleep(GRN_LOCK_WAIT_TIME_NANOSECOND);
}
if (GRN_FILE_LOCK_IS_INVALID(file_lock)) {
ERR(GRN_NO_LOCKS_AVAILABLE,
"%s failed to acquire lock: <%s>",
error_message_tag, file_lock->path);
return GRN_FALSE;
} else {
return GRN_TRUE;
}
}
void
grn_file_lock_release(grn_ctx *ctx, grn_file_lock *file_lock)
{
if (GRN_FILE_LOCK_IS_INVALID(file_lock)) {
return;
}
#ifdef WIN32
CloseHandle(file_lock->handle);
DeleteFile(file_lock->path);
file_lock->handle = INVALID_HANDLE_VALUE;
#else /* WIN32 */
close(file_lock->fd);
unlink(file_lock->path);
file_lock->fd = -1;
#endif /* WIN32 */
file_lock->path = NULL;
}
void
grn_file_lock_fin(grn_ctx *ctx, grn_file_lock *file_lock)
{
if (!GRN_FILE_LOCK_IS_INVALID(file_lock)) {
grn_file_lock_release(ctx, file_lock);
}
}
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