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/**
* File: Thread.cc
* Project: libvdr - classes taken from vdr-project
*
* from "Video Disk Recorder":
*
* Copyright (C) 2000, 2003, 2006, 2008 Klaus Schmidinger
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* The original author can be reached at kls@tvdr.de
*
* The vdr project's page is at http://www.tvdr.de
*
*/
#include <Thread.h>
#include <TimeMs.h>
#include <CondWait.h>
#include <Logging.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <sys/resource.h>
tThreadId cThread::mainThreadId = 0;
cThread::cThread(const char *Description)
: active(false)
, running(false)
, childTid(0)
, childThreadId(0)
, description(NULL)
, threadCallback(NULL)
, opaque(NULL)
{
if (Description) SetDescription("%s", Description);
}
cThread::cThread(int (*ThreadCallback)(void *, cThread *), void *Opaque, const char *Description)
: active(false)
, running(false)
, childTid(0)
, childThreadId(0)
, description(NULL)
, threadCallback(ThreadCallback)
, opaque(Opaque)
{
if (Description) SetDescription("%s", Description);
}
cThread::~cThread()
{
Cancel(); // just in case the derived class didn't call it
free(description);
}
void cThread::SetPriority(int Priority)
{
if (setpriority(PRIO_PROCESS, 0, Priority) < 0)
LOG_ERROR;
}
void cThread::SetIOPriority(int Priority)
{
if (syscall(SYS_ioprio_set, 1, 0, (Priority & 0xff) | (2 << 13)) < 0) // best effort class
LOG_ERROR;
}
void cThread::SetDescription(const char *Description, ...)
{
free(description);
description = NULL;
if (Description) {
va_list ap;
va_start(ap, Description);
vasprintf(&description, Description, ap);
va_end(ap);
}
}
void *cThread::StartThread(cThread *Thread)
{
Thread->childThreadId = ThreadId();
if (Thread->description) {
dsyslog("%s thread started (pid=%d, tid=%d)", Thread->description, getpid(), Thread->childThreadId);
#ifdef PR_SET_NAME
if (prctl(PR_SET_NAME, Thread->description, 0, 0, 0) < 0)
esyslog("%s thread naming failed (pid=%d, tid=%d)", Thread->description, getpid(), Thread->childThreadId);
#endif
}
Thread->Action();
if (Thread->description)
dsyslog("%s thread ended (pid=%d, tid=%d)", Thread->description, getpid(), Thread->childThreadId);
Thread->running = false;
Thread->active = false;
return NULL;
}
#define THREAD_STOP_TIMEOUT 3000 // ms to wait for a thread to stop before newly starting it
#define THREAD_STOP_SLEEP 30 // ms to sleep while waiting for a thread to stop
bool cThread::Start(void)
{
if (!running) {
if (active) {
// Wait until the previous incarnation of this thread has completely ended
// before starting it newly:
cTimeMs RestartTimeout;
while (!running && active && RestartTimeout.Elapsed() < THREAD_STOP_TIMEOUT)
cCondWait::SleepMs(THREAD_STOP_SLEEP);
}
if (!active) {
active = running = true;
if (pthread_create(&childTid, NULL, (void *(*) (void *))&StartThread, (void *)this) == 0) {
pthread_detach(childTid); // auto-reap
}
else {
LOG_ERROR;
active = running = false;
return false;
}
}
}
return true;
}
void cThread::Action()
{
if (!threadCallback) *((char *)0) = 0;
///< if not used the callback constructor, cThread must be subclassed, so stop application here!
threadCallback(opaque, this); // passing this as parameter allows the callback
// use the public interface of this instance.
}
bool cThread::Active(void)
{
if (active) {
//
// Single UNIX Spec v2 says:
//
// The pthread_kill() function is used to request
// that a signal be delivered to the specified thread.
//
// As in kill(), if sig is zero, error checking is
// performed but no signal is actually sent.
//
int err;
if ((err = pthread_kill(childTid, 0)) != 0) {
if (err != ESRCH)
LOG_ERROR;
childTid = 0;
active = running = false;
}
else
return true;
}
return false;
}
void cThread::Cancel(int WaitSeconds)
{
running = false;
if (active && WaitSeconds > -1) {
if (WaitSeconds > 0) {
for (time_t t0 = time(NULL) + WaitSeconds; time(NULL) < t0; ) {
if (!Active())
return;
cCondWait::SleepMs(10);
}
esyslog("ERROR: %s thread %d won't end (waited %d seconds) - canceling it...", description ? description : "", childThreadId, WaitSeconds);
}
pthread_cancel(childTid);
childTid = 0;
active = false;
}
}
tThreadId cThread::ThreadId(void)
{
return syscall(__NR_gettid);
}
void cThread::SetMainThreadId(void)
{
if (mainThreadId == 0)
mainThreadId = ThreadId();
else
esyslog("ERROR: attempt to set main thread id to %d while it already is %d", ThreadId(), mainThreadId);
}
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