void
NsConnThread(void *arg)
{
ConnData *dataPtr = arg;
Pool *poolPtr = dataPtr->poolPtr;
Conn *connPtr;
Ns_Time wait, *timePtr;
char name[100];
int status, ncons;
char *msg;
double spread;
/*
* Set the conn thread name.
*/
Ns_TlsSet(&ctdtls, dataPtr);
Ns_MutexLock(&poolPtr->lock);
sprintf(name, "-%s:%d-", poolPtr->name, poolPtr->threads.nextid++);
Ns_MutexUnlock(&poolPtr->lock);
Ns_ThreadSetName(name);
/* spread is a value of 1.0 +- specified percentage,
i.e. between 0.0 and 2.0 when the configured percentage is 100 */
spread = 1.0 + (2 * poolPtr->threads.spread * Ns_DRand() - poolPtr->threads.spread) / 100.0;
ncons = round(poolPtr->threads.maxconns * spread);
msg = "exceeded max connections per thread";
/*
* Start handling connections.
*/
Ns_MutexLock(&poolPtr->lock);
poolPtr->threads.starting--;
poolPtr->threads.idle++;
while (poolPtr->threads.maxconns <= 0 || ncons-- > 0) {
/*
* Wait for a connection to arrive, exiting if one doesn't
* arrive in the configured timeout period.
*/
if (poolPtr->threads.current <= poolPtr->threads.min) {
timePtr = NULL;
} else {
Ns_GetTime(&wait);
Ns_IncrTime(&wait, round(poolPtr->threads.timeout * spread), 0);
timePtr = &wait;
}
status = NS_OK;
while (!poolPtr->shutdown
&& status == NS_OK
&& poolPtr->queue.wait.firstPtr == NULL) {
/*
nothing is queued, we wait for a queue entry
*/
poolPtr->threads.waiting++;
status = Ns_CondTimedWait(&poolPtr->cond, &poolPtr->lock, timePtr);
poolPtr->threads.waiting--;
}
if (poolPtr->queue.wait.firstPtr == NULL) {
msg = "timeout waiting for connection";
break;
}
/*
* Pull the first connection off the waiting list.
*/
connPtr = poolPtr->queue.wait.firstPtr;
poolPtr->queue.wait.firstPtr = connPtr->nextPtr;
if (poolPtr->queue.wait.lastPtr == connPtr) {
poolPtr->queue.wait.lastPtr = NULL;
}
connPtr->nextPtr = NULL;
connPtr->prevPtr = poolPtr->queue.active.lastPtr;
if (poolPtr->queue.active.lastPtr != NULL) {
poolPtr->queue.active.lastPtr->nextPtr = connPtr;
}
poolPtr->queue.active.lastPtr = connPtr;
if (poolPtr->queue.active.firstPtr == NULL) {
poolPtr->queue.active.firstPtr = connPtr;
}
poolPtr->threads.idle--;
poolPtr->queue.wait.num--;
Ns_MutexUnlock(&poolPtr->lock);
/*
* Run the connection.
*/
Ns_MutexLock(&connlock);
dataPtr->connPtr = connPtr;
Ns_MutexUnlock(&connlock);
Ns_GetTime(&connPtr->times.run);
ConnRun(connPtr);
Ns_MutexLock(&connlock);
dataPtr->connPtr = NULL;
Ns_MutexUnlock(&connlock);
/*
* Remove from the active list and push on the free list.
*/
Ns_MutexLock(&poolPtr->lock);
if (connPtr->prevPtr != NULL) {
connPtr->prevPtr->nextPtr = connPtr->nextPtr;
} else {
poolPtr->queue.active.firstPtr = connPtr->nextPtr;
}
if (connPtr->nextPtr != NULL) {
connPtr->nextPtr->prevPtr = connPtr->prevPtr;
} else {
poolPtr->queue.active.lastPtr = connPtr->prevPtr;
}
poolPtr->threads.idle++;
Ns_MutexUnlock(&poolPtr->lock);
NsFreeConn(connPtr);
Ns_MutexLock(&poolPtr->lock);
}
/*
* Append this thread to list of threads to reap.
*/
Ns_MutexLock(&joinlock);
dataPtr->nextPtr = joinPtr;
joinPtr = dataPtr;
Ns_MutexUnlock(&joinlock);
/*
* Mark this thread as no longer active.
*/
if (poolPtr->shutdown) {
msg = "shutdown pending";
}
poolPtr->threads.current--;
poolPtr->threads.idle--;
if (((poolPtr->queue.wait.num > 0
&& poolPtr->threads.idle == 0
&& poolPtr->threads.starting == 0
)
|| (poolPtr->threads.current < poolPtr->threads.min)
) && !poolPtr->shutdown) {
/*
Recreate a thread when on of the condings hold
- there are more queue entries are still waiting,
but no thread is either starting or idle, or
- there are less than minthreads connection threads alive.
*/
poolPtr->threads.current ++;
Ns_MutexUnlock(&poolPtr->lock);
NsCreateConnThread(poolPtr, 0); /* joinThreads == 0 to avoid deadlock */
} else if (poolPtr->queue.wait.num > 0 && poolPtr->threads.waiting > 0) {
/*
Wake up a waiting thread
*/
Ns_CondSignal(&poolPtr->cond);
Ns_MutexUnlock(&poolPtr->lock);
} else {
Ns_MutexUnlock(&poolPtr->lock);
}
Ns_Log(Notice, "exiting: %s", msg);
Ns_ThreadExit(dataPtr);
}
void
WorkThread(void *arg)
{
int i = (int) arg;
int *ip;
time_t now;
Ns_Thread self;
char name[32];
sprintf(name, "-work:%d-", i);
Ns_ThreadSetName(name);
if (i == 2) {
Ns_RWLockWrLock(&rwlock);
Msg("rwlock write aquired");
sleep(2);
} else {
Ns_RWLockRdLock(&rwlock);
Msg("rwlock read aquired aquired");
sleep(1);
}
Ns_CsEnter(&cs);
Msg("enter critical section once");
Ns_CsEnter(&cs);
Msg("enter critical section twice");
Ns_CsLeave(&cs);
Ns_CsLeave(&cs);
Ns_ThreadSelf(&self);
arg = Ns_TlsGet(&key);
Ns_SemaWait(&sema);
Msg("got semaphore posted from main");
if (arg == NULL) {
arg = ns_malloc(sizeof(int));
Ns_TlsSet(&key, arg);
}
ip = arg;
*ip = i;
if (i == 5) {
Ns_Time to;
int st;
Ns_GetTime(&to);
Msg("time: %ld %ld", to.sec, to.usec);
Ns_IncrTime(&to, 5, 0);
Msg("time: %ld %ld", to.sec, to.usec);
Ns_MutexLock(&lock);
time(&now);
Msg("timed wait starts: %s", ns_ctime(&now));
st = Ns_CondTimedWait(&cond, &lock, &to);
Ns_MutexUnlock(&lock);
time(&now);
Msg("timed wait ends: %s - status: %d", ns_ctime(&now), st);
}
if (i == 9) {
Msg("sleep 4 seconds start");
sleep(4);
Msg("sleep 4 seconds done");
}
time(&now);
Ns_RWLockUnlock(&rwlock);
Msg("rwlock unlocked");
Msg("exiting");
Ns_ThreadExit((void *) i);
}
int
NsTclServerObjCmd(ClientData arg, Tcl_Interp *interp, int objc,
Tcl_Obj **objv)
{
Pool *poolPtr;
char buf[100], *pool;
Tcl_DString ds;
static CONST char *opts[] = {
"active", "all", "connections", "keepalive", "pools", "queued",
"threads", "waiting", NULL,
};
enum {
SActiveIdx, SAllIdx, SConnectionsIdx, SKeepaliveIdx, SPoolsIdx,
SQueuedIdx, SThreadsIdx, SWaitingIdx,
} _nsmayalias opt;
if (objc != 2 && objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?pool?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], opts, "option", 0,
(int *) &opt) != TCL_OK) {
return TCL_ERROR;
}
if (opt == SPoolsIdx) {
return NsTclListPoolsObjCmd(arg, interp, objc, objv);
}
if (objc == 2) {
pool = "default";
} else {
pool = Tcl_GetString(objv[2]);
}
if (NsTclGetPool(interp, pool, &poolPtr) != TCL_OK) {
return TCL_ERROR;
}
Ns_MutexLock(&poolPtr->lock);
switch (opt) {
case SPoolsIdx:
/* NB: Silence compiler. */
break;
case SWaitingIdx:
Tcl_SetObjResult(interp, Tcl_NewIntObj(poolPtr->queue.wait.num));
break;
case SKeepaliveIdx:
Tcl_SetObjResult(interp, Tcl_NewIntObj(0/*nsconf.keepalive.npending*/));
break;
case SConnectionsIdx:
Tcl_SetObjResult(interp, Tcl_NewIntObj((int) poolPtr->threads.nextid));
break;
case SThreadsIdx:
sprintf(buf, "min %d", poolPtr->threads.min);
Tcl_AppendElement(interp, buf);
sprintf(buf, "max %d", poolPtr->threads.max);
Tcl_AppendElement(interp, buf);
sprintf(buf, "current %d", poolPtr->threads.current);
Tcl_AppendElement(interp, buf);
sprintf(buf, "idle %d", poolPtr->threads.idle);
Tcl_AppendElement(interp, buf);
sprintf(buf, "stopping 0");
Tcl_AppendElement(interp, buf);
break;
case SActiveIdx:
case SQueuedIdx:
case SAllIdx:
Tcl_DStringInit(&ds);
if (opt != SQueuedIdx) {
AppendConnList(&ds, poolPtr->queue.active.firstPtr, "running");
}
if (opt != SActiveIdx) {
AppendConnList(&ds, poolPtr->queue.wait.firstPtr, "queued");
}
Tcl_DStringResult(interp, &ds);
}
Ns_MutexUnlock(&poolPtr->lock);
return TCL_OK;
}
