95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/* Spin locks in multithreaded situations.
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Copyright (C) 2005-2026 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>, 2025. */
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/* This file contains short-duration locking primitives for use with a given
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thread library.
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Spin locks:
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Type: gl_spinlock_t
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Declaration: gl_spinlock_define(extern, name)
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Initializer: gl_spinlock_define_initialized(, name)
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Initialization: gl_spinlock_init (name);
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Taking the lock: gl_spinlock_lock (name);
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Releasing the lock: gl_spinlock_unlock (name);
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De-initialization: gl_spinlock_destroy (name);
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Equivalent functions with control of error handling:
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Initialization: glthread_spinlock_init (&name);
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Taking the lock: glthread_spinlock_lock (&name);
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Releasing the lock: err = glthread_spinlock_unlock (&name);
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De-initialization: glthread_spinlock_destroy (&name);
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*/
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#ifndef _SPINLOCK_H
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#define _SPINLOCK_H
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#if defined _WIN32 && !defined __CYGWIN__
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# include "windows-spin.h"
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typedef glwthread_spinlock_t gl_spinlock_t;
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# define gl_spinlock_initializer GLWTHREAD_SPIN_INIT
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#else
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typedef unsigned int gl_spinlock_t;
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# define gl_spinlock_initializer 0
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdlib.h>
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#define gl_spinlock_define(STORAGECLASS, NAME) \
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STORAGECLASS gl_spinlock_t NAME;
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#define gl_spinlock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS gl_spinlock_t NAME = gl_spinlock_initializer;
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#define gl_spinlock_init(NAME) \
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glthread_spinlock_init (&NAME)
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#define gl_spinlock_lock(NAME) \
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glthread_spinlock_lock (&NAME)
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#define gl_spinlock_unlock(NAME) \
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do \
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{ \
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if (glthread_spinlock_unlock (&NAME)) \
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abort (); \
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} \
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while (0)
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#define gl_spinlock_destroy(NAME) \
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glthread_spinlock_destroy (&NAME)
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#if defined _WIN32 && !defined __CYGWIN__
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# define glthread_spinlock_init(lock) \
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glwthread_spin_init (lock)
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# define glthread_spinlock_lock(lock) \
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((void) glwthread_spin_lock (lock))
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# define glthread_spinlock_unlock(lock) \
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glwthread_spin_unlock (lock)
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# define glthread_spinlock_destroy(lock) \
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((void) glwthread_spin_destroy (lock))
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#else
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extern void glthread_spinlock_init (gl_spinlock_t *lock);
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extern void glthread_spinlock_lock (gl_spinlock_t *lock);
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extern int glthread_spinlock_unlock (gl_spinlock_t *lock);
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extern void glthread_spinlock_destroy (gl_spinlock_t *lock);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SPINLOCK_H */
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