20122021 Ericsson AB. All Rights Reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. Communication in Erlang Rickard Green uy 2012-12-03 PA1 communication.xml

Communication in Erlang is conceptually performed using asynchronous signaling. All different executing entities, such as processes and ports, communicate through asynchronous signals. The most commonly used signal is a message. Other common signals are exit, link, unlink, monitor, and demonitor signals.

Passing of Signals

This information has been moved to the Signals section of the Processes chapter in the Erlang Reference Manual.

Synchronous Communication

This information has been moved to the Signals section of the Processes chapter in the Erlang Reference Manual.

Implementation

The implementation of different asynchronous signals in the virtual machine can vary over time, but the behavior always respects this concept of asynchronous signals being passed between entities as described above.

By inspecting the implementation, you might notice that some specific signal gives a stricter guarantee than described above. It is of vital importance that such knowledge about the implementation is not used by Erlang code, as the implementation can change at any time without prior notice.

Examples of major implementation changes:

As from ERTS 5.5.2 exit signals to processes are truly asynchronously delivered. As from ERTS 5.10 all signals from processes to ports are truly asynchronously delivered.