wtiCancelThrd(wti_t *pThis, const uchar *const cancelobj)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, wti);
if(wtiGetState(pThis)) {
LogMsg(0, RS_RET_ERR, LOG_WARNING, "%s: need to do cooperative cancellation "
"- some data may be lost, increase timeout?", cancelobj);
/* we first try the cooperative "cancel" interface */
pthread_kill(pThis->thrdID, SIGTTIN);
DBGPRINTF("sent SIGTTIN to worker thread %p, giving it a chance to terminate\n",
(void *) pThis->thrdID);
srSleep(0, 10000);
}
if(wtiGetState(pThis)) {
LogMsg(0, RS_RET_ERR, LOG_WARNING, "%s: need to do hard cancellation", cancelobj);
DBGPRINTF("cooperative worker termination failed, using cancellation...\n");
DBGOPRINT((obj_t*) pThis, "canceling worker thread\n");
pthread_cancel(pThis->thrdID);
/* now wait until the thread terminates... */
while(wtiGetState(pThis)) {
srSleep(0, 10000);
}
}
RETiRet;
}
/* Cancel the thread. If the thread is not running. But it is save and legal to
* call wtiCancelThrd() in such situations. This function only returns when the
* thread has terminated. Else we may get race conditions all over the code...
* Note that when waiting for the thread to terminate, we do a busy wait, checking
* progress every 10ms. It is very unlikely that we will ever cancel a thread
* and, if so, it will only happen at the end of the rsyslog run. So doing this
* kind of non-optimal wait is considered preferable over using condition variables.
* rgerhards, 2008-02-26
*/
rsRetVal
wtiCancelThrd(wti_t *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, wti);
if(wtiGetState(pThis)) {
/* we first try the cooperative "cancel" interface */
pthread_kill(pThis->thrdID, SIGTTIN);
DBGPRINTF("sent SIGTTIN to worker thread 0x%x, giving it a chance to terminate\n", (unsigned) pThis->thrdID);
srSleep(0, 10000);
}
if(wtiGetState(pThis)) {
DBGPRINTF("cooperative worker termination failed, using cancellation...\n");
DBGOPRINT((obj_t*) pThis, "canceling worker thread\n");
pthread_cancel(pThis->thrdID);
/* now wait until the thread terminates... */
while(wtiGetState(pThis)) {
srSleep(0, 10000);
}
}
RETiRet;
}
/* advise all workers to start by interrupting them. That should unblock all srSleep()
* calls.
*/
rsRetVal
wtiWakeupThrd(wti_t *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, wti);
if(wtiGetState(pThis)) {
/* we first try the cooperative "cancel" interface */
pthread_kill(pThis->thrdID, SIGTTIN);
DBGPRINTF("sent SIGTTIN to worker thread %p\n", (void*) pThis->thrdID);
}
RETiRet;
}
/* advise all workers to start by interrupting them. That should unblock all srSleep()
* calls.
*/
rsRetVal
wtiWakeupThrd(wti_t *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, wti);
if(wtiGetState(pThis)) {
/* we first try the cooperative "cancel" interface */
pthread_kill(pThis->thrdID, SIGTTIN);
dbgprintf("sent SIGTTIN to worker thread 0x%x\n", (unsigned) pThis->thrdID);
}
RETiRet;
}
