summaryrefslogtreecommitdiffstats
path: root/include/iprt/spinlock.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/iprt/spinlock.h')
-rw-r--r--include/iprt/spinlock.h95
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 */
+