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/* Timed read-write locks (native Windows implementation).
Copyright (C) 2019-2020 Free Software Foundation, Inc.
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, 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, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2019. */
#ifndef _WINDOWS_TIMEDRWLOCK_H
#define _WINDOWS_TIMEDRWLOCK_H
#define WIN32_LEAN_AND_MEAN /* avoid including junk */
#include <windows.h>
#include <time.h>
#include "windows-initguard.h"
#ifndef _glwthread_linked_waitqueue_link_defined
#define _glwthread_linked_waitqueue_link_defined
struct glwthread_waitqueue_link
{
struct glwthread_waitqueue_link *wql_next;
struct glwthread_waitqueue_link *wql_prev;
};
#endif /* _glwthread_linked_waitqueue_link_defined */
typedef struct
{
struct glwthread_waitqueue_link wq_list; /* circular list of waiting threads */
unsigned int count; /* number of waiting threads */
}
glwthread_clinked_waitqueue_t;
typedef struct
{
glwthread_initguard_t guard; /* protects the initialization */
CRITICAL_SECTION lock; /* protects the remaining fields */
glwthread_clinked_waitqueue_t waiting_readers; /* waiting readers */
glwthread_clinked_waitqueue_t waiting_writers; /* waiting writers */
int runcount; /* number of readers running, or -1 when a writer runs */
}
glwthread_timedrwlock_t;
#define GLWTHREAD_TIMEDRWLOCK_INIT { GLWTHREAD_INITGUARD_INIT }
#ifdef __cplusplus
extern "C" {
#endif
extern void glwthread_timedrwlock_init (glwthread_timedrwlock_t *lock);
extern int glwthread_timedrwlock_rdlock (glwthread_timedrwlock_t *lock);
extern int glwthread_timedrwlock_wrlock (glwthread_timedrwlock_t *lock);
extern int glwthread_timedrwlock_tryrdlock (glwthread_timedrwlock_t *lock);
extern int glwthread_timedrwlock_trywrlock (glwthread_timedrwlock_t *lock);
extern int glwthread_timedrwlock_timedrdlock (glwthread_timedrwlock_t *lock,
const struct timespec *abstime);
extern int glwthread_timedrwlock_timedwrlock (glwthread_timedrwlock_t *lock,
const struct timespec *abstime);
extern int glwthread_timedrwlock_unlock (glwthread_timedrwlock_t *lock);
extern int glwthread_timedrwlock_destroy (glwthread_timedrwlock_t *lock);
#ifdef __cplusplus
}
#endif
#endif /* _WINDOWS_TIMEDRWLOCK_H */
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