void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t),
void* data, double timeout);
XBT_PUBLIC smx_activity_t simcall_comm_isend(smx_actor_t sender, smx_mailbox_t mbox, double task_size, double rate,
void* src_buff, size_t src_buff_size,
void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t),
void* data, double timeout);
XBT_PUBLIC smx_activity_t simcall_comm_isend(smx_actor_t sender, smx_mailbox_t mbox, double task_size, double rate,
void* src_buff, size_t src_buff_size,