From be8efac78d067c138ad8dda03df4336e73f94887 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Sat, 8 Jan 2022 11:51:07 +0100 Subject: New upstream version 1.0 --- lib/windows-rwlock.h | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 lib/windows-rwlock.h (limited to 'lib/windows-rwlock.h') diff --git a/lib/windows-rwlock.h b/lib/windows-rwlock.h new file mode 100644 index 0000000..65c5ab4 --- /dev/null +++ b/lib/windows-rwlock.h @@ -0,0 +1,68 @@ +/* Read-write locks (native Windows implementation). + Copyright (C) 2005-2022 Free Software Foundation, Inc. + + This file is free software: you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + This file 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 program. If not, see . */ + +/* Written by Bruno Haible , 2005. + Based on GCC's gthr-win32.h. */ + +#ifndef _WINDOWS_RWLOCK_H +#define _WINDOWS_RWLOCK_H + +#define WIN32_LEAN_AND_MEAN /* avoid including junk */ +#include + +#include "windows-initguard.h" + +/* It is impossible to implement read-write locks using plain locks, without + introducing an extra thread dedicated to managing read-write locks. + Therefore here we need to use the low-level Event type. */ + +typedef struct + { + HANDLE *array; /* array of waiting threads, each represented by an event */ + unsigned int count; /* number of waiting threads */ + unsigned int alloc; /* length of allocated array */ + unsigned int offset; /* index of first waiting thread in array */ + } + glwthread_carray_waitqueue_t; +typedef struct + { + glwthread_initguard_t guard; /* protects the initialization */ + CRITICAL_SECTION lock; /* protects the remaining fields */ + glwthread_carray_waitqueue_t waiting_readers; /* waiting readers */ + glwthread_carray_waitqueue_t waiting_writers; /* waiting writers */ + int runcount; /* number of readers running, or -1 when a writer runs */ + } + glwthread_rwlock_t; + +#define GLWTHREAD_RWLOCK_INIT { GLWTHREAD_INITGUARD_INIT } + +#ifdef __cplusplus +extern "C" { +#endif + +extern void glwthread_rwlock_init (glwthread_rwlock_t *lock); +extern int glwthread_rwlock_rdlock (glwthread_rwlock_t *lock); +extern int glwthread_rwlock_wrlock (glwthread_rwlock_t *lock); +extern int glwthread_rwlock_tryrdlock (glwthread_rwlock_t *lock); +extern int glwthread_rwlock_trywrlock (glwthread_rwlock_t *lock); +extern int glwthread_rwlock_unlock (glwthread_rwlock_t *lock); +extern int glwthread_rwlock_destroy (glwthread_rwlock_t *lock); + +#ifdef __cplusplus +} +#endif + +#endif /* _WINDOWS_RWLOCK_H */ -- cgit v1.2.3