llerrorthread.cpp
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- /**
- * @file llerrorthread.cpp
- *
- * $LicenseInfo:firstyear=2004&license=viewergpl$
- *
- * Copyright (c) 2004-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #include "linden_common.h"
- #include "llerrorthread.h"
- #include "llapp.h"
- #include "lltimer.h" // ms_sleep()
- LLErrorThread::LLErrorThread()
- : LLThread("Error"),
- mUserDatap(NULL)
- {
- }
- LLErrorThread::~LLErrorThread()
- {
- }
- void LLErrorThread::setUserData(void* user_data)
- {
- mUserDatap = user_data;
- }
- void* LLErrorThread::getUserData() const
- {
- return mUserDatap;
- }
- #if !LL_WINDOWS
- //
- // Various signal/error handling functions that can't be put into the class
- //
- void get_child_status(const int waitpid_status, int &process_status, bool &exited, bool do_logging)
- {
- exited = false;
- process_status = -1;
- // The child process exited. Call its callback, and then clean it up
- if (WIFEXITED(waitpid_status))
- {
- process_status = WEXITSTATUS(waitpid_status);
- exited = true;
- if (do_logging)
- {
- llinfos << "get_child_status - Child exited cleanly with return of " << process_status << llendl;
- }
- return;
- }
- else if (WIFSIGNALED(waitpid_status))
- {
- process_status = WTERMSIG(waitpid_status);
- exited = true;
- if (do_logging)
- {
- llinfos << "get_child_status - Child died because of uncaught signal " << process_status << llendl;
- #ifdef WCOREDUMP
- if (WCOREDUMP(waitpid_status))
- {
- llinfos << "get_child_status - Child dumped core" << llendl;
- }
- else
- {
- llinfos << "get_child_status - Child didn't dump core" << llendl;
- }
- #endif
- }
- return;
- }
- else if (do_logging)
- {
- // This is weird. I just dump the waitpid status into the status code,
- // not that there's any way of telling what it is...
- llinfos << "get_child_status - Got SIGCHILD but child didn't exit" << llendl;
- process_status = waitpid_status;
- }
- }
- #endif
- void LLErrorThread::run()
- {
- LLApp::sErrorThreadRunning = TRUE;
- // This thread sits and waits for the sole purpose
- // of waiting for the signal/exception handlers to flag the
- // application state as APP_STATUS_ERROR.
- llinfos << "thread_error - Waiting for an error" << llendl;
- S32 counter = 0;
- #if !LL_WINDOWS
- U32 last_sig_child_count = 0;
- #endif
- while (1)
- {
- if (LLApp::isError() || LLApp::isStopped())
- {
- // The application has stopped running, time to take action (maybe)
- break;
- }
- #if !LL_WINDOWS
- // Check whether or not the main thread had a sig child we haven't handled.
- U32 current_sig_child_count = LLApp::getSigChildCount();
- if (last_sig_child_count != current_sig_child_count)
- {
- int status = 0;
- pid_t child_pid = 0;
- last_sig_child_count = current_sig_child_count;
- if (LLApp::sLogInSignal)
- {
- llinfos << "thread_error handling SIGCHLD #" << current_sig_child_count << llendl;
- }
- for (LLApp::child_map::iterator iter = LLApp::sChildMap.begin(); iter != LLApp::sChildMap.end();)
- {
- child_pid = iter->first;
- LLChildInfo &child_info = iter->second;
- // check the status of *all* children, in case we missed a signal
- if (0 != waitpid(child_pid, &status, WNOHANG))
- {
- bool exited = false;
- int exit_status = -1;
- get_child_status(status, exit_status, exited, LLApp::sLogInSignal);
- if (child_info.mCallback)
- {
- if (LLApp::sLogInSignal)
- {
- llinfos << "Signal handler - Running child callback" << llendl;
- }
- child_info.mCallback(child_pid, exited, status);
- }
- LLApp::sChildMap.erase(iter++);
- }
- else
- {
- // Child didn't terminate, yet we got a sigchild somewhere...
- if (child_info.mGotSigChild && child_info.mCallback)
- {
- child_info.mCallback(child_pid, false, 0);
- }
- child_info.mGotSigChild = FALSE;
- iter++;
- }
- }
- // check the status of *all* children, in case we missed a signal
- // Same as above, but use the default child callback
- while(0 < (child_pid = waitpid( -1, &status, WNOHANG )))
- {
- if (0 != waitpid(child_pid, &status, WNOHANG))
- {
- bool exited = false;
- int exit_status = -1;
- get_child_status(status, exit_status, exited, LLApp::sLogInSignal);
- if (LLApp::sDefaultChildCallback)
- {
- if (LLApp::sLogInSignal)
- {
- llinfos << "Signal handler - Running default child callback" << llendl;
- }
- LLApp::sDefaultChildCallback(child_pid, true, status);
- }
- }
- }
- }
- #endif
- ms_sleep(10);
- counter++;
- }
- if (LLApp::isError())
- {
- // The app is in an error state, run the application's error handler.
- //llinfos << "thread_error - An error has occurred, running error callback!" << llendl;
- // Run the error handling callback
- LLApp::runErrorHandler();
- }
- else
- {
- // Everything is okay, a clean exit.
- //llinfos << "thread_error - Application exited cleanly" << llendl;
- }
-
- //llinfos << "thread_error - Exiting" << llendl;
- LLApp::sErrorThreadRunning = FALSE;
- }