void
MR_deallocate(MR_MemoryList allocated)
{
while (allocated != NULL) {
MR_MemoryList next = allocated->next;
/*
** These were allocated with MR_GC_NEW_ARRAY_ATTRIB so we must free
** using MR_GC_free_attrib.
**/
MR_GC_free_attrib(allocated->data);
MR_GC_free_attrib(allocated);
allocated = next;
}
}
/*
** MR_STM_block_thread is called to block the thread in high level C grades,
** using POSIX thread facilities, as there is a POSIX thread for every
** Mercury thread in these grades. The low level C grade equivalent of this
** code is defined in the stm_builtin library module.
*/
void
MR_STM_block_thread(MR_STM_TransLog *tlog)
{
#if defined(MR_THREAD_SAFE)
MR_STM_ConditionVar *thread_condvar;
thread_condvar = MR_GC_NEW_ATTRIB(MR_STM_ConditionVar,
MR_ALLOC_SITE_RUNTIME);
MR_STM_condvar_init(thread_condvar);
MR_STM_wait(tlog, thread_condvar);
#if defined(MR_STM_DEBUG)
fprintf(stderr, "STM BLOCKING: log <0x%.8lx>\n", (MR_Word)tlog);
#endif
MR_STM_condvar_wait(thread_condvar, &MR_STM_lock);
#if defined(MR_STM_DEBUG)
fprintf(stderr, "STM RESCHEDULING: log <0x%.8lx>\n", (MR_Word)tlog);
#endif
MR_STM_unwait(tlog, thread_condvar);
MR_UNLOCK(&MR_STM_lock, "MR_STM_block_thread");
MR_GC_free_attrib(thread_condvar);
#else
MR_fatal_error("Blocking thread in non-parallel grade");
#endif
}
static MR_MemoryZone *
MR_rewind_nondetstack_segments(MR_Word *maxfr)
{
MR_MemoryZone *zone_to_reuse;
MR_MemoryZone *zone;
MR_Word *limit;
MR_MemoryZones *list;
zone_to_reuse = NULL;
for (;;) {
zone = MR_CONTEXT(MR_ctxt_nondetstack_zone);
limit = (MR_Word *) zone->MR_zone_end;
if (maxfr >= zone->MR_zone_min && maxfr < limit) {
break;
}
#ifdef MR_DEBUG_STACK_SEGMENTS
printf("\nfreeing zone\n");
MR_print_zone(stdout, zone);
#endif
// If there are several currently unneeded segments, this algorithm
// reuses the zone of the topmost segment (the first segment in the
// list from the top), since its contents are more likely to have been
// recently referred to, and thus more likely to be in the cache.
//
// However, reusing the zone of the bottom-most unneeded segment
// would look conceptually a bit neater in that it would preserve
// the follows/precedes relationship between the zones.
if (zone_to_reuse == NULL) {
zone_to_reuse = zone;
} else {
MR_release_zone(zone);
}
list = MR_CONTEXT(MR_ctxt_prev_nondetstack_zones);
assert(list != NULL);
MR_CONTEXT(MR_ctxt_nondetstack_zone) = list->MR_zones_head;
MR_CONTEXT(MR_ctxt_prev_nondetstack_zones) = list->MR_zones_tail;
MR_GC_free_attrib(list);
}
#ifdef MR_DEBUG_STACK_SEGMENTS
if (zone_to_reuse == NULL) {
printf("\nno old nondet segment zone available for reuse\n");
} else {
printf("\nreturning zone of old nondet segment for reuse: %p\n",
zone_to_reuse);
}
#endif
return zone_to_reuse;
}
