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-rw-r--r--src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c
new file mode 100644
index 00000000..da7594c5
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c
@@ -0,0 +1,285 @@
+/* $Id: thread-r0drv-linux.c $ */
+/** @file
+ * IPRT - Threads, Ring-0 Driver, Linux.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include "the-linux-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/thread.h>
+
+#include <iprt/asm.h>
+#if RTLNX_VER_MAX(2,5,28) || defined(CONFIG_X86_SMAP)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mp.h>
+
+
+/*********************************************************************************************************************************
+* Defined Constants And Macros *
+*********************************************************************************************************************************/
+#if defined(CONFIG_PREEMPT_COUNT) /* since 3.1 */ \
+ || defined(CONFIG_PREEMPTION) /* since 5.3 */ \
+ || defined(CONFIG_PREEMPT) /* since 2.6.13 - preemption model choice; before that arch specific choice back to 2.5.45. */
+# define IPRT_LNX_HAVE_PREEMPTION
+#endif
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+#ifndef IPRT_LNX_HAVE_PREEMPTION
+/** Per-cpu preemption counters. */
+static int32_t volatile g_acPreemptDisabled[NR_CPUS];
+#endif
+
+
+RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
+{
+ return (RTNATIVETHREAD)current;
+}
+RT_EXPORT_SYMBOL(RTThreadNativeSelf);
+
+
+static int rtR0ThreadLnxSleepCommon(RTMSINTERVAL cMillies)
+{
+ IPRT_LINUX_SAVE_EFL_AC();
+ long cJiffies = msecs_to_jiffies(cMillies);
+ set_current_state(TASK_INTERRUPTIBLE);
+ cJiffies = schedule_timeout(cJiffies);
+ IPRT_LINUX_RESTORE_EFL_AC();
+ if (!cJiffies)
+ return VINF_SUCCESS;
+ return VERR_INTERRUPTED;
+}
+
+
+RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
+{
+ return rtR0ThreadLnxSleepCommon(cMillies);
+}
+RT_EXPORT_SYMBOL(RTThreadSleep);
+
+
+RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
+{
+ return rtR0ThreadLnxSleepCommon(cMillies);
+}
+RT_EXPORT_SYMBOL(RTThreadSleepNoLog);
+
+
+RTDECL(bool) RTThreadYield(void)
+{
+ IPRT_LINUX_SAVE_EFL_AC();
+#if RTLNX_VER_MIN(2,4,20)
+ yield();
+#else
+ /** @todo r=ramshankar: Can we use cond_resched() instead? */
+ set_current_state(TASK_RUNNING);
+ sys_sched_yield();
+ schedule();
+#endif
+ IPRT_LINUX_RESTORE_EFL_AC();
+ return true;
+}
+RT_EXPORT_SYMBOL(RTThreadYield);
+
+
+RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
+{
+#ifdef IPRT_LNX_HAVE_PREEMPTION
+ Assert(hThread == NIL_RTTHREAD); RT_NOREF_PV(hThread);
+# ifdef preemptible
+ return preemptible();
+# else
+ return preempt_count() == 0 && !in_atomic() && !irqs_disabled();
+# endif
+#else
+ int32_t c;
+
+ Assert(hThread == NIL_RTTHREAD);
+ c = g_acPreemptDisabled[smp_processor_id()];
+ AssertMsg(c >= 0 && c < 32, ("%d\n", c));
+ if (c != 0)
+ return false;
+# if RTLNX_VER_MIN(2,5,32)
+ if (in_atomic())
+ return false;
+# endif
+# if RTLNX_VER_MIN(2,5,28)
+ if (irqs_disabled())
+ return false;
+# else
+ if (!ASMIntAreEnabled())
+ return false;
+# endif
+ return true;
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsEnabled);
+
+
+RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
+{
+ Assert(hThread == NIL_RTTHREAD); RT_NOREF_PV(hThread);
+#if RTLNX_VER_MIN(2,5,4)
+ return !!test_tsk_thread_flag(current, TIF_NEED_RESCHED);
+
+#elif RTLNX_VER_MIN(2,4,20)
+ return !!need_resched();
+
+#elif RTLNX_VER_MIN(2,1,110)
+ return current->need_resched != 0;
+
+#else
+ return need_resched != 0;
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsPending);
+
+
+RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
+{
+ /* yes, RTThreadPreemptIsPending is reliable. */
+ return true;
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsPendingTrusty);
+
+
+RTDECL(bool) RTThreadPreemptIsPossible(void)
+{
+#ifdef IPRT_LNX_HAVE_PREEMPTION
+ return true; /* Yes, kernel preemption is possible. */
+#else
+ return false; /* No kernel preemption (or just CONFIG_PREEMPT_VOLUNTARY). */
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsPossible);
+
+
+RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
+{
+#ifdef IPRT_LNX_HAVE_PREEMPTION
+ AssertPtr(pState);
+ Assert(pState->u32Reserved == 0);
+ pState->u32Reserved = 42;
+ preempt_disable();
+ RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
+
+#else /* !IPRT_LNX_HAVE_PREEMPTION */
+ int32_t c;
+ AssertPtr(pState);
+ Assert(pState->u32Reserved == 0);
+
+ /* Do our own accounting. */
+ c = ASMAtomicIncS32(&g_acPreemptDisabled[smp_processor_id()]);
+ AssertMsg(c > 0 && c < 32, ("%d\n", c));
+ pState->u32Reserved = c;
+ RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptDisable);
+
+
+RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
+{
+#ifdef IPRT_LNX_HAVE_PREEMPTION
+ IPRT_LINUX_SAVE_EFL_AC(); /* paranoia */
+ AssertPtr(pState);
+ Assert(pState->u32Reserved == 42);
+ RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
+ preempt_enable();
+ IPRT_LINUX_RESTORE_EFL_ONLY_AC(); /* paranoia */
+
+#else
+ int32_t volatile *pc;
+ AssertPtr(pState);
+ AssertMsg(pState->u32Reserved > 0 && pState->u32Reserved < 32, ("%d\n", pState->u32Reserved));
+ RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
+
+ /* Do our own accounting. */
+ pc = &g_acPreemptDisabled[smp_processor_id()];
+ AssertMsg(pState->u32Reserved == (uint32_t)*pc, ("u32Reserved=%d *pc=%d \n", pState->u32Reserved, *pc));
+ ASMAtomicUoWriteS32(pc, pState->u32Reserved - 1);
+#endif
+ pState->u32Reserved = 0;
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptRestore);
+
+
+RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
+{
+ Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
+
+ return in_interrupt() != 0;
+}
+RT_EXPORT_SYMBOL(RTThreadIsInInterrupt);
+
+
+RTDECL(int) RTThreadQueryTerminationStatus(RTTHREAD hThread)
+{
+ struct task_struct *pTask = current;
+ AssertReturn(hThread == NIL_RTTHREAD, VERR_NOT_SUPPORTED);
+
+ /* Check out pending signals. ASSUMES we can get away w/o locking
+ anything because we're only reading the data. */
+ if (sigismember(&pTask->pending.signal, SIGKILL))
+ return VINF_THREAD_IS_TERMINATING;
+
+#if RTLNX_VER_MIN(2,5,34)
+ /* Check the pending signals shared with other threads in
+ the same process/group. ASSUME since we're alive that
+ the signal_struct won't be freed while we're looking
+ at it here... */
+ {
+# if RTLNX_VER_MIN(2,5,60)
+ struct signal_struct *pSignal = current->signal;
+# else
+ struct signal_struct *pSignal = current->sig;
+# endif
+ if ( pSignal
+ && sigismember(&pSignal->shared_pending.signal, SIGKILL))
+ return VINF_THREAD_IS_TERMINATING;
+ }
+#endif
+
+ return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTThreadQueryTerminationStatus);
+
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