C++ (Cpp) RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED示例

示例#1

文件： spinlock-r0drv-freebsd.c 项目： mdaniel/virtualbox-org-svn-vbox-trunk

RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
{
    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
    RT_ASSERT_PREEMPT_CPUID_VAR();
    AssertPtr(pThis);
    Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);

    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
    {
        for (;;)
        {
            uint32_t fIntSaved = ASMIntDisableFlags();
            critical_enter();

            int c = 50;
            for (;;)
            {
                if (ASMAtomicCmpXchgU32(&pThis->fLocked, 1, 0))
                {
                    RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
                    pThis->fIntSaved = fIntSaved;
                    return;
                }
                if (--c <= 0)
                    break;
                cpu_spinwait();
            }

            /* Enable interrupts while we sleep. */
            ASMSetFlags(fIntSaved);
            critical_exit();
            DELAY(1);
        }
    }
    else
    {
        for (;;)
        {
            critical_enter();

            int c = 50;
            for (;;)
            {
                if (ASMAtomicCmpXchgU32(&pThis->fLocked, 1, 0))
                {
                    RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
                    return;
                }
                if (--c <= 0)
                    break;
                cpu_spinwait();
            }

            critical_exit();
            DELAY(1);
        }
    }
}

示例#2

文件： spinlock-r0drv-linux.c 项目： greg100795/virtualbox

RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
{
    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
    RT_ASSERT_PREEMPT_CPUID_VAR();
    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_MAGIC,
              ("pThis=%p u32Magic=%08x\n", pThis, pThis ? (int)pThis->u32Magic : 0));

    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
    {
        unsigned long fIntSaved;
        spin_lock_irqsave(&pThis->Spinlock, fIntSaved);
        pThis->fIntSaved = fIntSaved;
    }
    else
        spin_lock(&pThis->Spinlock);

    RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
}

示例#3

文件： spinlock-r0drv-solaris.c 项目： mdaniel/virtualbox-org-svn-vbox-trunk

RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
{
    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
    RT_ASSERT_PREEMPT_CPUID_VAR();
    AssertPtr(pThis);
    Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);

    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
    {
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
        uint32_t fIntSaved = ASMIntDisableFlags();
#endif
        mutex_enter(&pThis->Mtx);

        /*
         * Solaris 10 doesn't preserve the interrupt flag, but since we're at PIL_MAX we should be
         * fine and not get interrupts while lock is held. Re-disable interrupts to not upset
         * assertions & assumptions callers might have.
         */
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
        ASMIntDisable();
#endif

#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
        Assert(!ASMIntAreEnabled());
#endif
        pThis->fIntSaved = fIntSaved;
    }
    else
    {
#if defined(RT_STRICT) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
        bool fIntsOn = ASMIntAreEnabled();
#endif

        mutex_enter(&pThis->Mtx);

#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
        AssertMsg(fIntsOn == ASMIntAreEnabled(), ("fIntsOn=%RTbool\n", fIntsOn));
#endif
    }

    RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
}