void doReadThread (void* arg)
{
PRInt32 last;
Arg_t *args = (Arg_t*)arg;
PRInt32 aWorkDelay = args->a, aWaitDelay = args->b;
PR_Sleep(0);
while (1)
{
// -- enter read lock
PR_EnterMonitor (gMonitor);
if (0 < gWriteWaiting) // give up the monitor to waiting writes
{
PRIntervalTime fiveSecs = PR_SecondsToInterval(5);
gReadWaiting++;
if (gReadWaiting > gMaxReadWaits) // stats
gMaxReadWaits = gReadWaiting;
while (0 < gWriteWaiting)
PR_Wait (gMonitor, fiveSecs);
gReadWaiting--;
}
gReading++;
gReads++; // stats
if (gReading > gMaxReads) // stats
gMaxReads = gReading;
PR_ExitMonitor (gMonitor);
// -- read lock entered
last = gCounter;
spin (aWorkDelay);
PR_ASSERT (gCounter == last); // test invariance
// -- exit read lock
PR_EnterMonitor (gMonitor); // read unlock
gReading--;
// if ((0 == gReading) && (0 < gWriteWaiting)) // notify waiting writes (do it anyway to show off the CondWait bug)
PR_NotifyAll (gMonitor);
PR_ExitMonitor (gMonitor);
// -- read lock exited
spin (aWaitDelay);
}
}
void doWriteThread (void* arg)
{
PRInt32 last;
Arg_t *args = (Arg_t*)arg;
PRInt32 aWorkDelay = args->a, aWaitDelay = args->b;
PR_Sleep(0);
while (1)
{
// -- enter write lock
PR_EnterMonitor (gMonitor);
if (0 < gReading) // wait for read locks to go away
{
PRIntervalTime fiveSecs = PR_SecondsToInterval(5);
gWriteWaiting++;
if (gWriteWaiting > gMaxWriteWaits) // stats
gMaxWriteWaits = gWriteWaiting;
while (0 < gReading)
PR_Wait (gMonitor, fiveSecs);
gWriteWaiting--;
}
// -- write lock entered
last = gCounter;
gCounter++;
spin (aWorkDelay);
PR_ASSERT (gCounter == (last + 1)); // test invariance
// -- exit write lock
// if (0 < gReadWaiting) // notify waiting reads (do it anyway to show off the CondWait bug)
PR_NotifyAll (gMonitor);
PR_ExitMonitor (gMonitor);
// -- write lock exited
spin (aWaitDelay);
}
}
JD_METHOD_(JDBool) CNSAdapter_NSPR::JD_NotifyAll(void* mon)
{
return PR_NotifyAll((PRMonitor*)mon);
}
