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Backport part of b21e8fdf3216b9a18d7f2edef9fc5ce5590f9969 that fixes an issue with geometry generation when multithreaded pipeline is enabled

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Fixes bullet soft body issue as well as LP 1671639
This commit is contained in:
rdb 2017-03-10 15:46:03 +01:00
parent 20085d182a
commit 63be56cd0e
1 changed files with 12 additions and 16 deletions
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28
panda/src/putil/copyOnWritePointer.cxx
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@ -99,19 +99,17 @@ get_write_pointer() {
}
PT(CopyOnWriteObject) new_object = _cow_object->make_cow_copy();
_cow_object->CachedTypedWritableReferenceCount::cache_unref();
_cow_object->_lock_mutex.release();
// We can't call cache_unref_delete, because we hold the lock.
if (!_cow_object->CachedTypedWritableReferenceCount::cache_unref()) {
_cow_object->_lock_mutex.release();
delete _cow_object;
} else {
_cow_object->_lock_mutex.release();
}
MutexHolder holder(new_object->_lock_mutex);
_cow_object = new_object;
_cow_object->cache_ref();
_cow_object->CachedTypedWritableReferenceCount::cache_ref();
_cow_object->_lock_status = CopyOnWriteObject::LS_locked_write;
_cow_object->_locking_thread = current_thread;
return new_object;
} else if (_cow_object->get_cache_ref_count() > 1) {
// No one else has it specifically read-locked, but there are
// other CopyOnWritePointers holding the same object, so we should
@ -124,19 +122,17 @@ get_write_pointer() {
}
PT(CopyOnWriteObject) new_object = _cow_object->make_cow_copy();
_cow_object->CachedTypedWritableReferenceCount::cache_unref();
_cow_object->_lock_mutex.release();
// We can't call cache_unref_delete, because we hold the lock.
if (!_cow_object->CachedTypedWritableReferenceCount::cache_unref()) {
_cow_object->_lock_mutex.release();
delete _cow_object;
} else {
_cow_object->_lock_mutex.release();
}
MutexHolder holder(new_object->_lock_mutex);
_cow_object = new_object;
_cow_object->cache_ref();
_cow_object->CachedTypedWritableReferenceCount::cache_ref();
_cow_object->_lock_status = CopyOnWriteObject::LS_locked_write;
_cow_object->_locking_thread = current_thread;
return new_object;
} else {
// No other thread has the pointer locked, and we're the only
// CopyOnWritePointer with this object. We can safely write to it