nsprpub/pr/src/cplus/rcthread.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is the Netscape Portable Runtime (NSPR).
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998-2000
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
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  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 /* RCThread.cpp - C++ wrapper on NSPR */
  39
  40 #include "rcthread.h"
  41 #include "rcinrval.h"
  42
  43 #include <prmem.h>
  44 #include <prlog.h>
  45 #include <stdio.h>
  46 #include <prinit.h>
  47
  48 static RCPrimordialThread *primordial = NULL;
  49
  50 void nas_Root(void *arg)
  51 {
  52     RCThread *him = (RCThread*)arg;
  53     while (RCThread::ex_unstarted == him->execution)
  54         (void)PR_Sleep(PR_INTERVAL_NO_TIMEOUT);  /* wait for Start() */
  55     him->RootFunction();  /* he gets a self reference */
  56     if (PR_UNJOINABLE_THREAD == PR_GetThreadState(him->identity))
  57         delete him;
  58 }  /* nas_Root */
  59
  60 RCThread::~RCThread() { }
  61
  62 RCThread::RCThread(): RCBase() { }
  63
  64 RCThread::RCThread(const RCThread&): RCBase()
  65 {
  66     PR_NOT_REACHED("Cannot call thread copy constructor");
  67 }  /* RCThread::RCThread */
  68
  69 RCThread::RCThread(
  70     RCThread::Scope scope, RCThread::State join, PRUint32 stackSize):
  71     RCBase()
  72 {
  73     execution = ex_unstarted;
  74     identity = PR_CreateThread(
  75         PR_USER_THREAD, nas_Root, this,
  76         PR_GetThreadPriority(PR_GetCurrentThread()),
  77         (PRThreadScope)scope, (PRThreadState)join, stackSize);
  78 }  /* RCThread::RCThread */
  79
  80 void RCThread::operator=(const RCThread&)
  81 {
  82     PR_NOT_REACHED("Cannot call thread assignment operator");
  83 }  /* RCThread::operator= */
  84
  85
  86 PRStatus RCThread::Start()
  87 {
  88     PRStatus rv;
  89     /* This is an unsafe check, but not too critical */
  90     if (RCThread::ex_unstarted == execution)
  91     {
  92         execution = RCThread::ex_started;
  93         rv = PR_Interrupt(identity);
  94         PR_ASSERT(PR_SUCCESS == rv);
  95     }
  96     else
  97     {
  98         rv = PR_FAILURE;
  99         PR_SetError(PR_INVALID_STATE_ERROR, 0);
 100     }
 101     return rv;
 102 }  /* RCThread::Start */
 103
 104 PRStatus RCThread::Join()
 105 {
 106     PRStatus rv;
 107     if (RCThread::ex_unstarted == execution)
 108     {
 109         rv = PR_FAILURE;
 110         PR_SetError(PR_INVALID_STATE_ERROR, 0);
 111     }
 112     else rv = PR_JoinThread(identity);
 113     if (PR_SUCCESS == rv) delete this;
 114     return rv;
 115 }  /* RCThread::Join */
 116
 117 PRStatus RCThread::Interrupt()
 118 {
 119     PRStatus rv;
 120     if (RCThread::ex_unstarted == execution)
 121     {
 122         rv = PR_FAILURE;
 123         PR_SetError(PR_INVALID_STATE_ERROR, 0);
 124     }
 125     else rv = PR_Interrupt(identity);
 126     return rv;
 127 }  /* RCThread::Interrupt */
 128
 129 void RCThread::ClearInterrupt() { PR_ClearInterrupt(); }
 130
 131 void RCThread::SetPriority(RCThread::Priority new_priority)
 132     { PR_SetThreadPriority(identity, (PRThreadPriority)new_priority); }
 133
 134 PRThread *RCThread::Self()
 135     { return PR_GetCurrentThread(); }
 136
 137 RCThread::Scope RCThread::GetScope() const
 138     { return (RCThread::Scope)PR_GetThreadScope(identity); }
 139
 140 RCThread::State RCThread::GetState() const
 141     { return (RCThread::State)PR_GetThreadState(identity); }
 142
 143 RCThread::Priority RCThread::GetPriority() const
 144     { return (RCThread::Priority)PR_GetThreadPriority(identity); }
 145
 146 static void _rc_PDDestructor(RCThreadPrivateData* privateData)
 147 {
 148     PR_ASSERT(NULL != privateData);
 149     privateData->Release();
 150 }
 151
 152 static PRThreadPrivateDTOR _tpd_dtor = (PRThreadPrivateDTOR)_rc_PDDestructor;
 153
 154 PRStatus RCThread::NewPrivateIndex(PRUintn* index)
 155     { return PR_NewThreadPrivateIndex(index, _tpd_dtor); }
 156
 157 PRStatus RCThread::SetPrivateData(PRUintn index)
 158     { return PR_SetThreadPrivate(index, NULL); }
 159
 160 PRStatus RCThread::SetPrivateData(PRUintn index, RCThreadPrivateData* data)
 161 {
 162     return PR_SetThreadPrivate(index, data);
 163 }
 164
 165 RCThreadPrivateData* RCThread::GetPrivateData(PRUintn index)
 166     { return (RCThreadPrivateData*)PR_GetThreadPrivate(index); }
 167
 168 PRStatus RCThread::Sleep(const RCInterval& ticks)
 169     { PRIntervalTime tmo = ticks; return PR_Sleep(tmo); }
 170
 171 RCPrimordialThread *RCThread::WrapPrimordialThread()
 172 {
 173     /*
 174     ** This needs to take more care in insuring that the thread
 175     ** being wrapped is really the primordial thread. This code
 176     ** is assuming that the caller is the primordial thread, and
 177     ** there's nothing to insure that.
 178     */
 179     if (NULL == primordial)
 180     {
 181         /* it doesn't have to be perfect */
 182         RCPrimordialThread *me = new RCPrimordialThread();
 183         PR_ASSERT(NULL != me);
 184         if (NULL == primordial)
 185         {
 186             primordial = me;
 187             me->execution = RCThread::ex_started;
 188             me->identity = PR_GetCurrentThread();
 189         }
 190         else delete me;  /* somebody beat us to it */
 191     }
 192     return primordial;
 193 }  /* RCThread::WrapPrimordialThread */
 194
 195 RCPrimordialThread::RCPrimordialThread(): RCThread() { }
 196
 197 RCPrimordialThread::~RCPrimordialThread() { }
 198
 199 void RCPrimordialThread::RootFunction()
 200 {
 201     PR_NOT_REACHED("Primordial thread calling root function");
 202 }  /* RCPrimordialThread::RootFunction */
 203
 204 PRStatus RCPrimordialThread::Cleanup() { return PR_Cleanup(); }
 205
 206 PRStatus RCPrimordialThread::SetVirtualProcessors(PRIntn count)
 207 {
 208     PR_SetConcurrency(count);
 209     return PR_SUCCESS;
 210 }  /* SetVirutalProcessors */
 211
 212 RCThreadPrivateData::RCThreadPrivateData() { }
 213
 214 RCThreadPrivateData::RCThreadPrivateData(
 215     const RCThreadPrivateData& him) { }
 216
 217 RCThreadPrivateData::~RCThreadPrivateData() { }
 218
 219 /* RCThread.c */
 220