Fix null pointer dereference.

[simgrid.git] / src / s4u / s4u_Comm.cpp

diff --git a/src/s4u/s4u_Comm.cpp b/src/s4u/s4u_Comm.cpp
index 7d3a926..a841ac4 100644 (file)
--- a/src/s4u/s4u_Comm.cpp
+++ b/src/s4u/s4u_Comm.cpp
@@ -4,8 +4,10 @@
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
 #include "src/msg/msg_private.hpp"
+#include "src/simix/ActorImpl.hpp"
 #include "xbt/log.h"
 
+#include "simgrid/Exception.hpp"
 #include "simgrid/s4u/Comm.hpp"
 #include "simgrid/s4u/Mailbox.hpp"
 
@@ -47,7 +49,7 @@ void Comm::wait_all(std::vector<CommPtr>* comms)
     comm->wait();
 }
 
-Comm* Comm::set_rate(double rate)
+CommPtr Comm::set_rate(double rate)
 {
   xbt_assert(state_ == State::INITED, "You cannot use %s() once your communication started (not implemented)",
              __FUNCTION__);
@@ -55,7 +57,7 @@ Comm* Comm::set_rate(double rate)
   return this;
 }
 
-Comm* Comm::set_src_data(void* buff)
+CommPtr Comm::set_src_data(void* buff)
 {
   xbt_assert(state_ == State::INITED, "You cannot use %s() once your communication started (not implemented)",
              __FUNCTION__);
@@ -63,14 +65,16 @@ Comm* Comm::set_src_data(void* buff)
   src_buff_ = buff;
   return this;
 }
-Comm* Comm::set_src_data_size(size_t size)
+
+CommPtr Comm::set_src_data_size(size_t size)
 {
   xbt_assert(state_ == State::INITED, "You cannot use %s() once your communication started (not implemented)",
              __FUNCTION__);
   src_buff_size_ = size;
   return this;
 }
-Comm* Comm::set_src_data(void* buff, size_t size)
+
+CommPtr Comm::set_src_data(void* buff, size_t size)
 {
   xbt_assert(state_ == State::INITED, "You cannot use %s() once your communication started (not implemented)",
              __FUNCTION__);
@@ -80,7 +84,7 @@ Comm* Comm::set_src_data(void* buff, size_t size)
   src_buff_size_ = size;
   return this;
 }
-Comm* Comm::set_dst_data(void** buff)
+CommPtr Comm::set_dst_data(void** buff)
 {
   xbt_assert(state_ == State::INITED, "You cannot use %s() once your communication started (not implemented)",
              __FUNCTION__);
@@ -88,12 +92,13 @@ Comm* Comm::set_dst_data(void** buff)
   dst_buff_ = buff;
   return this;
 }
+
 size_t Comm::get_dst_data_size()
 {
   xbt_assert(state_ == State::FINISHED, "You cannot use %s before your communication terminated", __FUNCTION__);
   return dst_buff_size_;
 }
-Comm* Comm::set_dst_data(void** buff, size_t size)
+CommPtr Comm::set_dst_data(void** buff, size_t size)
 {
   xbt_assert(state_ == State::INITED, "You cannot use %s() once your communication started (not implemented)",
              __FUNCTION__);
@@ -142,7 +147,7 @@ Comm* Comm::wait_for(double timeout)
 {
   switch (state_) {
     case State::FINISHED:
-      return this;
+      break;
 
     case State::INITED: // It's not started yet. Do it in one simcall
       if (src_buff_ != nullptr) {
@@ -156,13 +161,16 @@ Comm* Comm::wait_for(double timeout)
                           user_data_, timeout, rate_);
       }
       state_ = State::FINISHED;
-      return this;
+      break;
 
     case State::STARTED:
       simcall_comm_wait(pimpl_, timeout);
       on_completion(Actor::self());
       state_ = State::FINISHED;
-      return this;
+      break;
+
+    case State::CANCELED:
+      throw CancelException(XBT_THROW_POINT, "Communication canceled");
 
     default:
       THROW_IMPOSSIBLE;
@@ -190,7 +198,10 @@ Comm* Comm::detach()
 
 Comm* Comm::cancel()
 {
-  simgrid::simix::simcall([this] { static_cast<kernel::activity::CommImpl*>(pimpl_.get())->cancel(); });
+  simgrid::simix::simcall([this] {
+    if (pimpl_)
+      boost::static_pointer_cast<kernel::activity::CommImpl>(pimpl_)->cancel();
+  });
   state_ = State::CANCELED;
   return this;
 }
@@ -217,6 +228,11 @@ MailboxPtr Comm::get_mailbox()
   return mailbox_;
 }
 
+ActorPtr Comm::get_sender()
+{
+  return sender_ ? sender_->iface() : nullptr;
+}
+
 void intrusive_ptr_release(simgrid::s4u::Comm* c)
 {
   if (c->refcount_.fetch_sub(1, std::memory_order_release) == 1) {