76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
/* Timed read-write locks (native Windows implementation).
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Copyright (C) 2019-2025 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2019. */
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#ifndef _WINDOWS_TIMEDRWLOCK_H
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#define _WINDOWS_TIMEDRWLOCK_H
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#define WIN32_LEAN_AND_MEAN /* avoid including junk */
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#include <windows.h>
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#include <time.h>
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#include "windows-initguard.h"
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#ifndef _glwthread_linked_waitqueue_link_defined
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#define _glwthread_linked_waitqueue_link_defined
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struct glwthread_waitqueue_link
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{
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struct glwthread_waitqueue_link *wql_next;
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struct glwthread_waitqueue_link *wql_prev;
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};
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#endif /* _glwthread_linked_waitqueue_link_defined */
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typedef struct
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{
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struct glwthread_waitqueue_link wq_list; /* circular list of waiting threads */
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unsigned int count; /* number of waiting threads */
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}
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glwthread_clinked_waitqueue_t;
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typedef struct
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{
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glwthread_initguard_t guard; /* protects the initialization */
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CRITICAL_SECTION lock; /* protects the remaining fields */
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glwthread_clinked_waitqueue_t waiting_readers; /* waiting readers */
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glwthread_clinked_waitqueue_t waiting_writers; /* waiting writers */
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int runcount; /* number of readers running, or -1 when a writer runs */
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}
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glwthread_timedrwlock_t;
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#define GLWTHREAD_TIMEDRWLOCK_INIT { GLWTHREAD_INITGUARD_INIT }
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void glwthread_timedrwlock_init (glwthread_timedrwlock_t *lock);
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extern int glwthread_timedrwlock_rdlock (glwthread_timedrwlock_t *lock);
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extern int glwthread_timedrwlock_wrlock (glwthread_timedrwlock_t *lock);
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extern int glwthread_timedrwlock_tryrdlock (glwthread_timedrwlock_t *lock);
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extern int glwthread_timedrwlock_trywrlock (glwthread_timedrwlock_t *lock);
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extern int glwthread_timedrwlock_timedrdlock (glwthread_timedrwlock_t *lock,
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const struct timespec *abstime);
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extern int glwthread_timedrwlock_timedwrlock (glwthread_timedrwlock_t *lock,
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const struct timespec *abstime);
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extern int glwthread_timedrwlock_unlock (glwthread_timedrwlock_t *lock);
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extern int glwthread_timedrwlock_destroy (glwthread_timedrwlock_t *lock);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _WINDOWS_TIMEDRWLOCK_H */
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