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/* threads.c
*
* This file implements threading support helpers (and maybe the thread object)
* for rsyslog.
*
* File begun on 2007-12-14 by RGerhards
*
* Copyright 2007 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <pthread.h>
#include <assert.h>
#include "rsyslog.h"
#include "dirty.h"
#include "linkedlist.h"
#include "threads.h"
/* linked list of currently-known threads */
static linkedList_t llThrds;
/* methods */
/* Construct a new thread object
*/
static rsRetVal thrdConstruct(thrdInfo_t **ppThis)
{
DEFiRet;
thrdInfo_t *pThis;
assert(ppThis != NULL);
if((pThis = calloc(1, sizeof(thrdInfo_t))) == NULL)
return RS_RET_OUT_OF_MEMORY;
/* OK, we got the element, now initialize members that should
* not be zero-filled.
*/
pThis->mutTermOK = (pthread_mutex_t *) malloc (sizeof (pthread_mutex_t));
pthread_mutex_init (pThis->mutTermOK, NULL);
*ppThis = pThis;
RETiRet;
}
/* Destructs a thread object. The object must not be linked to the
* linked list of threads. Please note that the thread should have been
* stopped before. If not, we try to do it.
*/
static rsRetVal thrdDestruct(thrdInfo_t *pThis)
{
DEFiRet;
assert(pThis != NULL);
if(pThis->bIsActive == 1) {
thrdTerminate(pThis);
}
free(pThis->mutTermOK);
free(pThis);
RETiRet;
}
/* terminate a thread gracefully.
*/
rsRetVal thrdTerminate(thrdInfo_t *pThis)
{
DEFiRet;
assert(pThis != NULL);
pthread_cancel(pThis->thrdID);
pthread_join(pThis->thrdID, NULL); /* wait for cancel to complete */
pThis->bIsActive = 0;
/* call cleanup function, if any */
if(pThis->pAfterRun != NULL)
pThis->pAfterRun(pThis);
RETiRet;
}
/* terminate all known threads gracefully.
*/
rsRetVal thrdTerminateAll(void)
{
DEFiRet;
llDestroy(&llThrds);
RETiRet;
}
/* This is an internal wrapper around the user thread function. Its
* purpose is to handle all the necessary housekeeping stuff so that the
* user function needs not to be aware of the threading calls. The user
* function call has just "normal", non-threading semantics.
* rgerhards, 2007-12-17
*/
static void* thrdStarter(void *arg)
{
DEFiRet;
thrdInfo_t *pThis = (thrdInfo_t*) arg;
assert(pThis != NULL);
assert(pThis->pUsrThrdMain != NULL);
/* block all signals */
sigset_t sigSet;
sigfillset(&sigSet);
pthread_sigmask(SIG_BLOCK, &sigSet, NULL);
/* setup complete, we are now ready to execute the user code. We will not
* regain control until the user code is finished, in which case we terminate
* the thread.
*/
iRet = pThis->pUsrThrdMain(pThis);
dbgprintf("thrdStarter: usrThrdMain 0x%lx returned with iRet %d, exiting now.\n", (unsigned long) pThis->thrdID, iRet);
ENDfunc
pthread_exit(0);
}
/* Start a new thread and add it to the list of currently
* executing threads. It is added at the end of the list.
* rgerhards, 2007-12-14
*/
rsRetVal thrdCreate(rsRetVal (*thrdMain)(thrdInfo_t*), rsRetVal(*afterRun)(thrdInfo_t *))
{
DEFiRet;
thrdInfo_t *pThis;
int i;
assert(thrdMain != NULL);
CHKiRet(thrdConstruct(&pThis));
pThis->bIsActive = 1;
pThis->pUsrThrdMain = thrdMain;
pThis->pAfterRun = afterRun;
i = pthread_create(&pThis->thrdID, NULL, thrdStarter, pThis);
CHKiRet(llAppend(&llThrds, NULL, pThis));
finalize_it:
RETiRet;
}
/* initialize the thread-support subsystem
* must be called once at the start of the program
*/
rsRetVal thrdInit(void)
{
DEFiRet;
iRet = llInit(&llThrds, thrdDestruct, NULL, NULL);
RETiRet;
}
/* de-initialize the thread subsystem
* must be called once at the end of the program
*/
rsRetVal thrdExit(void)
{
DEFiRet;
iRet = llDestroy(&llThrds);
RETiRet;
}
/* thrdSleep() - a fairly portable way to put a thread to sleep. It
* will wake up when
* a) the wake-time is over
* b) the thread shall be terminated
* Returns RS_RET_OK if all went well, RS_RET_TERMINATE_NOW if the calling
* thread shall be terminated and any other state if an error happened.
* rgerhards, 2007-12-17
*/
rsRetVal
thrdSleep(thrdInfo_t *pThis, int iSeconds, int iuSeconds)
{
DEFiRet;
struct timeval tvSelectTimeout;
assert(pThis != NULL);
tvSelectTimeout.tv_sec = iSeconds;
tvSelectTimeout.tv_usec = iuSeconds; /* micro seconds */
select(1, NULL, NULL, NULL, &tvSelectTimeout);
if(pThis->bShallStop)
iRet = RS_RET_TERMINATE_NOW;
RETiRet;
}
/*
* vi:set ai:
*/
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