reworked task join, only waiting on session close, should now properly wait on active tasks
reworked task join, only waiting on session close, should now properly wait on active tasks

icing/mod_h2,icing/mod_h2,r4-keisuke/mod_h2,icing/mod_h2,r4-keisuke/mod_h2,icing/mod_h2,r4-keisuke/mod_h2,r4-keisuke/mod_h2,r4-keisuke/mod_h2,icing/mod_h2,r4-keisuke/mod_h2