Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 227 insertions, 0 deletions

diff --git a/src/VBox/Runtime/generic/spinlock-generic.cpp b/src/VBox/Runtime/generic/spinlock-generic.cpp
new file mode 100644
index 00000000..cf03107d
--- /dev/null
+++ b/src/VBox/Runtime/generic/spinlock-generic.cpp
@@ -0,0 +1,227 @@
+/* $Id: spinlock-generic.cpp $ */
+/** @file
+ * IPRT - Spinlock, generic implementation.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** @def RT_CFG_SPINLOCK_GENERIC_DO_SLEEP
+ * Force cpu yields after spinning the number of times indicated by the define.
+ * If 0 we will spin forever. */
+#define RT_CFG_SPINLOCK_GENERIC_DO_SLEEP    100000
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/spinlock.h>
+#include "internal/iprt.h"
+
+#include <iprt/alloc.h>
+#include <iprt/asm.h>
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#include <iprt/errcore.h>
+#include <iprt/assert.h>
+#if RT_CFG_SPINLOCK_GENERIC_DO_SLEEP
+# include <iprt/thread.h>
+#endif
+
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Generic spinlock structure.
+ */
+typedef struct RTSPINLOCKINTERNAL
+{
+    /** Spinlock magic value (RTSPINLOCK_GEN_MAGIC). */
+    uint32_t            u32Magic;
+    /** The spinlock creation flags. */
+    uint32_t            fFlags;
+    /** The spinlock. */
+    uint32_t volatile   fLocked;
+    /** The saved CPU interrupt. */
+    uint32_t volatile   fIntSaved;
+} RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
+
+
+RTDECL(int)  RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
+{
+    PRTSPINLOCKINTERNAL pThis;
+    AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
+    RT_NOREF_PV(pszName);
+
+    /*
+     * Allocate.
+     */
+    pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    /*
+     * Initialize and return.
+     */
+    pThis->u32Magic  = RTSPINLOCK_GEN_MAGIC;
+    pThis->fFlags    = fFlags;
+    pThis->fIntSaved = 0;
+    ASMAtomicWriteU32(&pThis->fLocked, 0);
+
+    *pSpinlock = pThis;
+    return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTSpinlockCreate);
+
+
+RTDECL(int)  RTSpinlockDestroy(RTSPINLOCK Spinlock)
+{
+    /*
+     * Validate input.
+     */
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    if (!pThis)
+        return VERR_INVALID_PARAMETER;
+    if (pThis->u32Magic != RTSPINLOCK_GEN_MAGIC)
+    {
+        AssertMsgFailed(("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    ASMAtomicIncU32(&pThis->u32Magic);
+    RTMemFree(pThis);
+    return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTSpinlockDestroy);
+
+
+RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_GEN_MAGIC,
+              ("pThis=%p u32Magic=%08x\n", pThis, pThis ? (int)pThis->u32Magic : 0));
+
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
+    {
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+        uint32_t fIntSaved = ASMGetFlags();
+#endif
+
+#if RT_CFG_SPINLOCK_GENERIC_DO_SLEEP
+        for (;;)
+        {
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+            ASMIntDisable();
+#endif
+            for (int c = RT_CFG_SPINLOCK_GENERIC_DO_SLEEP; c > 0; c--)
+            {
+                if (ASMAtomicCmpXchgU32(&pThis->fLocked, 1, 0))
+                {
+# if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+                    pThis->fIntSaved = fIntSaved;
+# endif
+                    return;
+                }
+                ASMNopPause();
+            }
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+            ASMSetFlags(fIntSaved);
+#endif
+            RTThreadYield();
+        }
+#else
+        for (;;)
+        {
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+            ASMIntDisable();
+#endif
+            if (ASMAtomicCmpXchgU32(&pThis->fLocked, 1, 0))
+            {
+# if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+                pThis->fIntSaved = fIntSaved;
+# endif
+                return;
+            }
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+            ASMSetFlags(fIntSaved);
+#endif
+            ASMNopPause();
+        }
+#endif
+    }
+    else
+    {
+#if RT_CFG_SPINLOCK_GENERIC_DO_SLEEP
+        for (;;)
+        {
+            for (int c = RT_CFG_SPINLOCK_GENERIC_DO_SLEEP; c > 0; c--)
+            {
+                if (ASMAtomicCmpXchgU32(&pThis->fLocked, 1, 0))
+                    return;
+                ASMNopPause();
+            }
+            RTThreadYield();
+        }
+#else
+        while (!ASMAtomicCmpXchgU32(&pThis->fLocked, 1, 0))
+            ASMNopPause();
+#endif
+    }
+}
+RT_EXPORT_SYMBOL(RTSpinlockAcquire);
+
+
+RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_GEN_MAGIC,
+              ("pThis=%p u32Magic=%08x\n", pThis, pThis ? (int)pThis->u32Magic : 0));
+
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
+    {
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+        uint32_t fIntSaved = pThis->fIntSaved;
+        pThis->fIntSaved   = 0;
+#endif
+
+        if (!ASMAtomicCmpXchgU32(&pThis->fLocked, 0, 1))
+            AssertMsgFailed(("Spinlock %p was not locked!\n", pThis));
+
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+        ASMSetFlags(fIntSaved);
+#endif
+    }
+    else
+    {
+        if (!ASMAtomicCmpXchgU32(&pThis->fLocked, 0, 1))
+            AssertMsgFailed(("Spinlock %p was not locked!\n", pThis));
+    }
+}
+RT_EXPORT_SYMBOL(RTSpinlockRelease);
+