/* static */ void *
GCRuntime::tryRefillFreeListFromMainThread(JSContext *cx, AllocKind thingKind)
{
ArenaLists *arenas = cx->arenas();
Zone *zone = cx->zone();
AutoMaybeStartBackgroundAllocation maybeStartBGAlloc;
void *thing = arenas->allocateFromArena(zone, thingKind, maybeStartBGAlloc);
if (MOZ_LIKELY(thing))
return thing;
// Even if allocateFromArena failed due to OOM, a background
// finalization or allocation task may be running freeing more memory
// or adding more available memory to our free pool; wait for them to
// finish, then try to allocate again in case they made more memory
// available.
cx->runtime()->gc.waitBackgroundSweepOrAllocEnd();
thing = arenas->allocateFromArena(zone, thingKind, maybeStartBGAlloc);
if (thing)
return thing;
return nullptr;
}
/* static */ void*
GCRuntime::refillFreeListFromMainThread(JSContext* cx, AllocKind thingKind, size_t thingSize)
{
ArenaLists *arenas = cx->arenas();
Zone *zone = cx->zone();
MOZ_ASSERT(!cx->runtime()->isHeapBusy(), "allocating while under GC");
AutoMaybeStartBackgroundAllocation maybeStartBGAlloc;
return arenas->allocateFromArena(zone, thingKind, maybeStartBGAlloc);
}
/* static */ void*
GCRuntime::refillFreeListOffMainThread(ExclusiveContext* cx, AllocKind thingKind)
{
ArenaLists* arenas = cx->arenas();
Zone* zone = cx->zone();
JSRuntime* rt = zone->runtimeFromAnyThread();
AutoMaybeStartBackgroundAllocation maybeStartBGAlloc;
// If we're off the main thread, we try to allocate once and return
// whatever value we get. We need to first ensure the main thread is not in
// a GC session.
AutoLockHelperThreadState lock;
while (rt->isHeapBusy())
HelperThreadState().wait(GlobalHelperThreadState::PRODUCER);
return arenas->allocateFromArena(zone, thingKind, maybeStartBGAlloc);
}