Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

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

1 files changed, 329 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/darwin/sched-darwin.cpp b/src/VBox/Runtime/r3/darwin/sched-darwin.cpp
new file mode 100644
index 00000000..9b52a5e6
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/sched-darwin.cpp
@@ -0,0 +1,329 @@
+/* $Id: sched-darwin.cpp $ */
+/** @file
+ * IPRT - Scheduling, Darwin.
+ */
+
+/*
+ * Copyright (C) 2006-2019 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_THREAD
+#include <mach/thread_act.h>
+#include <mach/thread_policy.h>
+#include <mach/thread_info.h>
+#include <mach/host_info.h>
+#include <mach/mach_init.h>
+#include <mach/mach_host.h>
+#include <sched.h>
+#include <pthread.h>
+#include <limits.h>
+#include <errno.h>
+
+#include <iprt/thread.h>
+#include <iprt/log.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include "internal/sched.h"
+#include "internal/thread.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Configuration of one priority.
+ */
+typedef struct
+{
+    /** The priority. */
+    RTPROCPRIORITY  enmPriority;
+    /** The name of this priority. */
+    const char     *pszName;
+    /** Array scheduler attributes corresponding to each of the thread types. */
+    struct
+    {
+        /** For sanity include the array index. */
+        RTTHREADTYPE    enmType;
+        /** The desired mach base_priority value. */
+        int             iBasePriority;
+        /** The suggested priority value. (Same as iBasePriority seems to do the
+         *  trick.) */
+        int             iPriority;
+    } aTypes[RTTHREADTYPE_END];
+} PROCPRIORITY;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * Array of static priority configurations.
+ *
+ * ASSUMES that pthread_setschedparam takes a sched_priority argument in the
+ * range 0..127, which is translated into mach base_priority 0..63 and mach
+ * importance -31..32 (among other things). We also ASSUMES SCHED_OTHER.
+ *
+ * The base_priority range can be checked with tstDarwinSched, we're assuming it's
+ * 0..63 for user processes.
+ *
+ * Further we observe that fseventsd and mds both run at (mach) priority 50,
+ * while Finder runs at 47. At priority 63 we find the dynamic pager, the login
+ * window, UserEventAgent, SystemUIServer and coreaudiod. We do not wish to upset the
+ * dynamic pager, UI or audio, but we wish for I/O to not be bothered by spotlight
+ * (mds/fseventsd).
+ */
+static const PROCPRIORITY g_aPriorities[] =
+{
+    {
+        RTPROCPRIORITY_LOW, "Low",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       20, 20 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       22, 22 },
+            { RTTHREADTYPE_EMULATION,               24, 24 },
+            { RTTHREADTYPE_DEFAULT,                 28, 28 },
+            { RTTHREADTYPE_GUI,                     29, 29 },
+            { RTTHREADTYPE_MAIN_WORKER,             30, 30 },
+            { RTTHREADTYPE_VRDP_IO,                 31, 31 },
+            { RTTHREADTYPE_DEBUGGER,                31, 31 },
+            { RTTHREADTYPE_MSG_PUMP,                31, 31 },
+            { RTTHREADTYPE_IO,                      31, 31 },
+            { RTTHREADTYPE_TIMER,                   31, 31 }
+        }
+    },
+    {
+        RTPROCPRIORITY_NORMAL, "Normal",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       29, 29 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       30, 30 },
+            { RTTHREADTYPE_EMULATION,               31, 31 }, /* the default priority */
+            { RTTHREADTYPE_DEFAULT,                 32, 32 },
+            { RTTHREADTYPE_GUI,                     32, 32 },
+            { RTTHREADTYPE_MAIN_WORKER,             32, 32 },
+            { RTTHREADTYPE_VRDP_IO,                 39, 39 },
+            { RTTHREADTYPE_DEBUGGER,                42, 42 },
+            { RTTHREADTYPE_MSG_PUMP,                47, 47 },
+            { RTTHREADTYPE_IO,                      52, 52 },
+            { RTTHREADTYPE_TIMER,                   55, 55 }
+        }
+    },
+    {
+        RTPROCPRIORITY_HIGH, "High",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       30, 30 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       31, 31 },
+            { RTTHREADTYPE_EMULATION,               32, 32 },
+            { RTTHREADTYPE_DEFAULT,                 40, 40 },
+            { RTTHREADTYPE_GUI,                     41, 41 },
+            { RTTHREADTYPE_MAIN_WORKER,             43, 43 },
+            { RTTHREADTYPE_VRDP_IO,                 45, 45 },
+            { RTTHREADTYPE_DEBUGGER,                47, 47 },
+            { RTTHREADTYPE_MSG_PUMP,                49, 49 },
+            { RTTHREADTYPE_IO,                      57, 57 },
+            { RTTHREADTYPE_TIMER,                   61, 61 }
+        }
+    },
+    /* last */
+    {
+        RTPROCPRIORITY_FLAT, "Flat",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       31, 31 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       31, 31 },
+            { RTTHREADTYPE_EMULATION,               31, 31 },
+            { RTTHREADTYPE_DEFAULT,                 31, 31 },
+            { RTTHREADTYPE_GUI,                     31, 31 },
+            { RTTHREADTYPE_MAIN_WORKER,             31, 31 },
+            { RTTHREADTYPE_VRDP_IO,                 31, 31 },
+            { RTTHREADTYPE_DEBUGGER,                31, 31 },
+            { RTTHREADTYPE_MSG_PUMP,                31, 31 },
+            { RTTHREADTYPE_IO,                      31, 31 },
+            { RTTHREADTYPE_TIMER,                   31, 31 }
+        }
+    },
+};
+
+
+/**
+ * The dynamic default priority configuration.
+ *
+ * This can be recalulated at runtime depending on what the
+ * system allow us to do. Presently we don't do this as it seems
+ * Darwin generally lets us do whatever we want.
+ *
+ * @remarks this is the same as "Normal" above.
+ */
+static PROCPRIORITY g_aDefaultPriority =
+{
+    RTPROCPRIORITY_DEFAULT, "Default",
+    {
+        { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+        { RTTHREADTYPE_INFREQUENT_POLLER,       29, 29 },
+        { RTTHREADTYPE_MAIN_HEAVY_WORKER,       30, 30 },
+        { RTTHREADTYPE_EMULATION,               31, 31 }, /* the default priority */
+        { RTTHREADTYPE_DEFAULT,                 32, 32 },
+        { RTTHREADTYPE_GUI,                     32, 32 },
+        { RTTHREADTYPE_MAIN_WORKER,             32, 32 },
+        { RTTHREADTYPE_VRDP_IO,                 39, 39 },
+        { RTTHREADTYPE_DEBUGGER,                42, 42 },
+        { RTTHREADTYPE_MSG_PUMP,                47, 47 },
+        { RTTHREADTYPE_IO,                      52, 52 },
+        { RTTHREADTYPE_TIMER,                   55, 55 }
+    }
+};
+
+
+/** Pointer to the current priority configuration. */
+static const PROCPRIORITY *g_pProcessPriority = &g_aDefaultPriority;
+
+
+/**
+ * Get's the priority information for the current thread.
+ *
+ * @returns The base priority
+ */
+static int rtSchedDarwinGetBasePriority(void)
+{
+    /* the base_priority. */
+    mach_msg_type_number_t              Count = POLICY_TIMESHARE_INFO_COUNT;
+    struct policy_timeshare_info        TSInfo = {0,0,0,0,0};
+    kern_return_t                       krc;
+    krc = thread_info(mach_thread_self(), THREAD_SCHED_TIMESHARE_INFO, (thread_info_t)&TSInfo, &Count);
+    Assert(krc == KERN_SUCCESS);
+
+    return TSInfo.base_priority;
+}
+
+
+DECLHIDDEN(int) rtSchedNativeCalcDefaultPriority(RTTHREADTYPE enmType)
+{
+    Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
+
+    /*
+     * Get the current priority.
+     */
+    int iBasePriority = rtSchedDarwinGetBasePriority();
+    Assert(iBasePriority >= 0 && iBasePriority <= 63);
+
+    /*
+     * If it doesn't match the default, select the closest one from the table.
+     */
+    int offBest = RT_ABS(g_pProcessPriority->aTypes[enmType].iBasePriority - iBasePriority);
+    if (offBest)
+    {
+        for (unsigned i = 0; i < RT_ELEMENTS(g_aPriorities); i++)
+        {
+            int off = RT_ABS(g_aPriorities[i].aTypes[enmType].iBasePriority - iBasePriority);
+            if (off < offBest)
+            {
+                g_pProcessPriority = &g_aPriorities[i];
+                if (!off)
+                    break;
+                offBest = off;
+            }
+        }
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(int) rtProcNativeSetPriority(RTPROCPRIORITY enmPriority)
+{
+    Assert(enmPriority > RTPROCPRIORITY_INVALID && enmPriority < RTPROCPRIORITY_LAST);
+
+    /*
+     * No checks necessary, we assume we can set any priority in the user process range.
+     */
+    const PROCPRIORITY *pProcessPriority = &g_aDefaultPriority;
+    for (unsigned i = 0; i < RT_ELEMENTS(g_aPriorities); i++)
+        if (g_aPriorities[i].enmPriority == enmPriority)
+        {
+            pProcessPriority = &g_aPriorities[i];
+            break;
+        }
+    Assert(pProcessPriority != &g_aDefaultPriority);
+    ASMAtomicUoWritePtr(&g_pProcessPriority, pProcessPriority);
+
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
+{
+    Assert(pThread->Core.Key == pthread_self());
+    Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
+    AssertMsg(g_pProcessPriority && g_pProcessPriority->aTypes[enmType].enmType == enmType,
+              ("enmType=%d entry=%d\n", enmType, g_pProcessPriority->aTypes[enmType].enmType));
+
+    /*
+     * Get the current policy and params first since there are
+     * opaque members in the param structure and we don't wish to
+     * change the policy.
+     */
+    int iSchedPolicy = SCHED_OTHER;
+    struct sched_param SchedParam = {0, {0,0,0,0} };
+    int err = pthread_getschedparam((pthread_t)pThread->Core.Key, &iSchedPolicy, &SchedParam);
+    if (!err)
+    {
+        int const iDesiredBasePriority = g_pProcessPriority->aTypes[enmType].iBasePriority;
+        int       iPriority            = g_pProcessPriority->aTypes[enmType].iPriority;
+
+        /*
+         * First try with the given pthread priority number.
+         * Then make adjustments in case we missed the desired base priority (interface
+         * changed or whatever - its using an obsolete mach api).
+         */
+        SchedParam.sched_priority = iPriority;
+        err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam);
+        if (!err)
+        {
+            int i = 0;
+            int iBasePriority = rtSchedDarwinGetBasePriority();
+
+            while (!err && iBasePriority < iDesiredBasePriority && i++ < 256)
+            {
+                SchedParam.sched_priority = ++iPriority;
+                err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam);
+                iBasePriority = rtSchedDarwinGetBasePriority();
+            }
+
+            while (!err && iBasePriority > iDesiredBasePriority && i++ < 256)
+            {
+                SchedParam.sched_priority = --iPriority;
+                err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam);
+                iBasePriority = rtSchedDarwinGetBasePriority();
+            }
+        }
+    }
+    int rc = RTErrConvertFromErrno(err);
+    AssertMsgRC(rc, ("rc=%Rrc err=%d iSchedPolicy=%d sched_priority=%d\n",
+                     rc, err, iSchedPolicy, SchedParam.sched_priority));
+    return rc;
+}
+