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Diffstat (limited to 'include/iprt/spinlock.h')
-rw-r--r-- | include/iprt/spinlock.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/include/iprt/spinlock.h b/include/iprt/spinlock.h new file mode 100644 index 00000000..d9769f0e --- /dev/null +++ b/include/iprt/spinlock.h @@ -0,0 +1,95 @@ +/** @file + * IPRT - Spinlocks. + */ + +/* + * Copyright (C) 2006-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef IPRT_INCLUDED_spinlock_h +#define IPRT_INCLUDED_spinlock_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> + +RT_C_DECLS_BEGIN + + +/** @defgroup grp_rt_spinlock RTSpinlock - Spinlocks + * @ingroup grp_rt + * @{ + */ + +/** + * Creates a spinlock. + * + * @returns iprt status code. + * @param pSpinlock Where to store the spinlock handle. + * @param fFlags Creation flags, see RTSPINLOCK_FLAGS_XXX. + * @param pszName Spinlock name, for debugging purposes. String lifetime + * must be the same as the lock as it won't be copied. + */ +RTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName); + +/** @name RTSPINLOCK_FLAGS_XXX + * @{ */ +/** Disable interrupts when taking the spinlock, making it interrupt safe + * (sans NMI of course). + * + * This is generally the safest option, though it isn't really required unless + * the data being protect is also accessed from interrupt handler context. */ +#define RTSPINLOCK_FLAGS_INTERRUPT_SAFE RT_BIT(1) +/** No need to disable interrupts, the protect code/data is not used by + * interrupt handlers. */ +#define RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE RT_BIT(2) +/** @} */ + +/** + * Destroys a spinlock created by RTSpinlockCreate(). + * + * @returns iprt status code. + * @param Spinlock Spinlock returned by RTSpinlockCreate(). + */ +RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock); + +/** + * Acquires the spinlock. + * + * @param Spinlock The spinlock to acquire. + */ +RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock); + +/** + * Releases the spinlock. + * + * @param Spinlock The spinlock to acquire. + */ +RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock); + + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_spinlock_h */ + |