README
¶
P-out-of-Q model deadlock
Implementation of the Kshemkalyani-Singhal Algorithm for P-out-of-Q Model on a simulation of a distributed system with ipc
Compilation instructions
The only needed dependency in this project is go version 1.17.
To build all targets:
make build-all
Execution instructions
To execute a simulation of three different processes, first instantiate the processes simulators:
make p1-3
make p2-3
make p3-3
On three different terminals.
Then, use the comands to send REQUEST and REPLY messages on each terminal to design a WFG
REQUEST:
ask p_number list_of_nodes
REPLY:
liberate parent_number
To detect a deadlock, choose a terminal, then:
detect
In case you want to build your own simulation with a different number of processes, you can do so executing the binary directly. For instance, to simulate four different processes:
./bin/process 1 10005 10004 10003 10002
./bin/process 2 10005 10004 10003 10002
./bin/process 3 10005 10004 10003 10002
./bin/process 4 10005 10004 10003 10002
The first argument indicates to the simulator which is his own port, from the arguments that follows.
Fixtures
We also have an alternative way to build WFG, using
a csv file. It is read by the puppeteer target, which
then applies the requested commands to each
process. The following is an example of a valid csv file
1,ask 1 2,3
2,ask 1 3,3
3,ask 1 1,3
2,liberate 1,3
The first column is the id of the process to which the command is directed, the second is the argument in itself, and the third is the number of milliseconds you want the program to wait after executing the command.
There are four pre-built examples of WFG in the folder /fxt,
which might be useful to quickly build a WFG for testing.
Directories