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mieq: Backtrace when the queue overflows. 

Since we're probably stuck down in a driver somewhere, let's at least
try to point out where.  This will need to be rethought when the input
thread work lands though.
This commit is contained in:
Adam Jackson 2008-10-10 16:33:24 -04:00
parent 94ed0ba1b5
commit b736f477f5
1 changed files with 6 additions and 0 deletions
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6
mi/mieq.c
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@ -169,6 +169,7 @@ mieqEnqueue(DeviceIntPtr pDev, xEvent *e)
oldtail = (oldtail - 1) % QUEUE_SIZE; oldtail = (oldtail - 1) % QUEUE_SIZE;
} }
else { else {
static int stuck = 0;
newtail = (oldtail + 1) % QUEUE_SIZE; newtail = (oldtail + 1) % QUEUE_SIZE;
/* Toss events which come in late. Usually this means your server's /* Toss events which come in late. Usually this means your server's
* stuck in an infinite loop somewhere, but SIGIO is still getting * stuck in an infinite loop somewhere, but SIGIO is still getting
@ -176,8 +177,13 @@ mieqEnqueue(DeviceIntPtr pDev, xEvent *e)
if (newtail == miEventQueue.head) { if (newtail == miEventQueue.head) {
ErrorF("[mi] EQ overflowing. The server is probably stuck " ErrorF("[mi] EQ overflowing. The server is probably stuck "
"in an infinite loop.\n"); "in an infinite loop.\n");
if (!stuck) {
xorg_backtrace();
stuck = 1;
}
return; return;
} }
stuck = 0;
miEventQueue.tail = newtail; miEventQueue.tail = newtail;
} }