| 1 | /** @file
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| 2 | *
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| 3 | * VBox frontends: VBoxSDL (simple frontend based on SDL):
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| 4 | * Miscellaneous helpers
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2006 InnoTek Systemberatung GmbH
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| 9 | *
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| 10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 11 | * available from http://www.virtualbox.org. This file is free software;
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| 12 | * you can redistribute it and/or modify it under the terms of the GNU
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| 13 | * General Public License as published by the Free Software Foundation,
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| 14 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 15 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 16 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 17 | *
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| 18 | * If you received this file as part of a commercial VirtualBox
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| 19 | * distribution, then only the terms of your commercial VirtualBox
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| 20 | * license agreement apply instead of the previous paragraph.
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| 21 | */
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| 22 |
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| 23 | #define LOG_GROUP LOG_GROUP_GUI
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| 24 | #include <VBox/err.h>
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| 25 | #include <VBox/log.h>
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| 26 | #include <iprt/assert.h>
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| 27 | #include <iprt/thread.h>
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| 28 | #include <iprt/semaphore.h>
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| 29 | #include "VBoxSDL.h"
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| 30 | #include "Helper.h"
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * Globals
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| 35 | */
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| 36 |
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| 37 |
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| 38 | #ifdef USE_XPCOM_QUEUE_THREAD
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| 39 |
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| 40 | /** global flag indicating that the event queue thread should terminate */
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| 41 | bool volatile g_fTerminateXPCOMQueueThread = false;
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| 42 |
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| 43 | /** Semaphore the XPCOM event thread will sleep on while it waits for the main thread to process pending requests. */
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| 44 | RTSEMEVENT g_EventSemXPCOMQueueThread = NULL;
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| 45 |
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| 46 | /**
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| 47 | * Thread method to wait for XPCOM events and notify the SDL thread.
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| 48 | *
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| 49 | * @returns Error code
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| 50 | * @param thread Thread ID
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| 51 | * @param pvUser User specific parameter, the file descriptor
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| 52 | * of the event queue socket
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| 53 | */
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| 54 | DECLCALLBACK(int) xpcomEventThread(RTTHREAD thread, void *pvUser)
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| 55 | {
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| 56 | int eqFD = (intptr_t)pvUser;
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| 57 | unsigned cErrors = 0;
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| 58 | int rc;
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| 59 |
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| 60 | /* Wait with the processing till the main thread needs it. */
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| 61 | RTSemEventWait(g_EventSemXPCOMQueueThread, 2500);
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| 62 |
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| 63 | do
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| 64 | {
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| 65 | fd_set fdset;
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| 66 | FD_ZERO(&fdset);
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| 67 | FD_SET(eqFD, &fdset);
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| 68 | int n = select(eqFD + 1, &fdset, NULL, NULL, NULL);
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| 69 |
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| 70 |
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| 71 | /* are there any events to process? */
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| 72 | if ((n > 0) && !g_fTerminateXPCOMQueueThread)
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| 73 | {
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| 74 | /*
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| 75 | * Post the event and wait for it to be processed. If we don't wait,
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| 76 | * we'll flood the queue on SMP systems and when the main thread is busy.
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| 77 | * In the event of a push error, we'll yield the timeslice and retry.
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| 78 | */
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| 79 | SDL_Event event = {0};
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| 80 | event.type = SDL_USEREVENT;
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| 81 | event.user.type = SDL_USER_EVENT_XPCOM_EVENTQUEUE;
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| 82 | rc = SDL_PushEvent(&event);
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| 83 | if (!rc)
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| 84 | {
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| 85 | RTSemEventWait(g_EventSemXPCOMQueueThread, 100);
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| 86 | cErrors = 0;
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| 87 | }
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| 88 | else
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| 89 | {
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| 90 | cErrors++;
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| 91 | if (!RTThreadYield())
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| 92 | RTThreadSleep(2);
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| 93 | if (cErrors >= 10)
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| 94 | RTSemEventWait(g_EventSemXPCOMQueueThread, RT_MIN(cErrors - 8, 50));
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| 95 | }
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| 96 | }
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| 97 | } while (!g_fTerminateXPCOMQueueThread);
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| 98 | return VINF_SUCCESS;
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| 99 | }
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| 100 |
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| 101 | /**
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| 102 | * Creates the XPCOM event thread
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| 103 | *
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| 104 | * @returns VBOX status code
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| 105 | * @param eqFD XPCOM event queue file descriptor
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| 106 | */
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| 107 | int startXPCOMEventQueueThread(int eqFD)
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| 108 | {
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| 109 | int rc = RTSemEventCreate(&g_EventSemXPCOMQueueThread);
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| 110 | if (VBOX_SUCCESS(rc))
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| 111 | {
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| 112 | RTTHREAD Thread;
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| 113 | rc = RTThreadCreate(&Thread, xpcomEventThread, (void *)eqFD, 0, RTTHREADTYPE_MSG_PUMP, 0, "XPCOMEvent");
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| 114 | }
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| 115 | AssertRC(rc);
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| 116 | return rc;
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| 117 | }
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| 118 |
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| 119 | /**
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| 120 | * Signal to the XPCOM even queue thread that it should select for more events.
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| 121 | */
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| 122 | void signalXPCOMEventQueueThread(void)
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| 123 | {
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| 124 | int rc = RTSemEventSignal(g_EventSemXPCOMQueueThread);
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| 125 | AssertRC(rc);
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| 126 | }
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| 127 |
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| 128 | /**
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| 129 | * Indicates to the XPCOM thread that it should terminate now.
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| 130 | */
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| 131 | void terminateXPCOMQueueThread(void)
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| 132 | {
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| 133 | g_fTerminateXPCOMQueueThread = true;
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| 134 | if (g_EventSemXPCOMQueueThread)
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| 135 | {
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| 136 | RTSemEventSignal(g_EventSemXPCOMQueueThread);
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| 137 | RTThreadYield();
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| 138 | }
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| 139 | }
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| 140 |
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| 141 |
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| 142 |
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| 143 | #endif /* USE_XPCOM_QUEUE_THREAD */
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| 144 |
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