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Sort timers by priority before initializing them, so we avoid initializing 

timers which we will never use.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33218 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Stefano Ceccherini 2009-09-21 09:49:41 +00:00
parent 6e72ebfce3
commit bed1c0d42e
1 changed files with 34 additions and 17 deletions
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51
src/system/kernel/arch/x86/arch_timer.c
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@ -62,34 +62,51 @@ arch_timer_clear_hardware_timer(void)
}
static void
sort_timers(timer_info *timers[], int numTimers)
{
int size;
timer_info *tempPtr;
int max = 0;
int i = 0;
for (size = numTimers; size > 1; size--) {
for (i = 0; i < size; i++) {
if (timers[i]->get_priority() > timers[max]->get_priority())
max = i;
}
tempPtr = timers[max];
timers[max] = timers[size - 1];
timers[size - 1] = tempPtr;
}
#if 0
for (i = 0; i < numTimers; i++) {
dprintf("timer[%d]: prio %d\n", i, timers[i]->get_priority());
}
#endif
}
int
arch_init_timer(kernel_args *args)
{
int i = 0;
int bestPriority = -1;
timer_info *timer = NULL;
cpu_status state = disable_interrupts();
cpu_status state;
sort_timers(sTimers, (sizeof(sTimers) / sizeof(sTimers[0])) - 1);
state = disable_interrupts();
for (i = 0; (timer = sTimers[i]) != NULL; i++) {
int priority = timer->get_priority();
if (priority < bestPriority) {
TRACE(("arch_init_timer: Skipping %s because there is a higher priority timer (%s) initialized.\n", timer->name, sTimer->name));
continue;
}
if (timer->init(args) != B_OK) {
if (timer->init(args) == B_OK) {
TRACE(("arch_init_timer: %s failed init. Skipping.\n", timer->name));
continue;
}
if (priority > bestPriority) {
bestPriority = priority;
sTimer = timer;
TRACE(("arch_init_timer: %s is now best timer module with prio %d.\n", timer->name, bestPriority));
break;
}
}
sTimer = timer;
if (sTimer != NULL) {
dprintf("arch_init_timer: using %s timer.\n", sTimer->name);
} else {