okeuday / pqueue Goto Github PK
View Code? Open in Web Editor NEWErlang Priority Queues
License: MIT License
pqueue's People
Contributors
Stargazers
Watchers
Forkers
yamt wdshin alepharchives zabrane nycholas chinnurtb umatomba astocko yongboy ruanpienaar m-2k lavstudia kostis hesonghua sircular ioolkospqueue's Issues
proper dependency
Even though pqueue does not impose proper dependency, it will fail compiling pqueue_proper module. I'd rather not include proper into another library I'd like to use pqueue from... Is there any way to make pqueue_proper compilation conditional somehow?
Error in pqueue2
If I use PropEr to generate random sequences, the following one:
[{set,{var,1},{call,queue_srv,in,[-18]}},{set,{var,5},{call,queue_srv,in,[9]}},{set,{var,6},{call,queue_srv,in,[-10,-4]}},{set,{var,18},{call,queue_srv,in,[-29]}},{set,{var,22},{call,queue_srv,in,[11]}},{set,{var,26},{call,queue_srv,len,[]}}]
Fails. We basically "in" a lot of things... -18, 9, (-10 at prio -4), -29 and so on, followed by a call to len. This is the minimal test case, shrunk 12 times. The internal error is:
=ERROR REPORT==== 11-Nov-2011::16:27:08 ===
** Generic server queue_srv terminating
** Last message in was len
** When Server state == {state,pqueue2,
{-4,
{0,empty,empty,queue,{"\v",[-29]}},
{0,empty,empty,queue,{"\t",[-18]}},
element,-10}}
** Reason for termination ==
** {function_clause,[{pqueue2,merge,
[{0,empty,empty,queue,{"\v",[-29]}},
{0,empty,empty,queue,{"\t",[-18]}}],
[{file,"src/pqueue2.erl"},{line,444}]},
{pqueue2,out,1,[{file,"src/pqueue2.erl"},{line,173}]},
{pqueue2,len,1,[{file,"src/pqueue2.erl"},{line,144}]},
{queue_srv,handle_call,3,
[{file,"src/queue_srv.erl"},{line,98}]},
{gen_server,handle_msg,5,
[{file,"gen_server.erl"},{line,578}]},
{proc_lib,init_p_do_apply,3,[]}]}
pqueue error on emptiness.
The following trace constructs an error, this time in pqueue:
Shrinking .....(5 time(s))
[{set,{var,1},{call,queue_srv,in,[36,4]}},{set,{var,4},{call,queue_srv,out,[]}},{set,{var,6},{call,queue_srv,is_empty,[]}}]
History: [{{state,[]},ok},{{state,[{4,[36]}]},{value,36}},{{state,[]},false}]
State: {state,[]}
Result: {postcondition,false}
That is:
- Insert an element
36with priority4. - Remove that element.
- call
pqueue:is_emptyon the resulting queue.
This returns false - the queue is not empty. But if we try to out an element of the empty queue, we get told it is empty. There seem to be some problems with priorities.
Another error in pqueue2.
There is a problem with either my model or pqueue2:
Shrinking .......(7 time(s))
[{set,{var,1},{call,queue_srv,in,[-11]}},{set,{var,3},{call,queue_srv,in,[12,-13]}},{set,{var,5},{call,queue_srv,in,[-21]}},{set,{var,8},{call,queue_srv,in,[6]}},{set,{var,12},{call,queue_srv,to_list,[]}}]
History: [{{state,[]},ok},{{state,[{0,[-11]}]},ok},{{state,[{-13,[12]},{0,[-11]}]},ok},{{state,[{-13,[12]},{0,[-11,-21]}]},ok},{{state,[{-13,[12]},{0,[-11,-21,6]}]},[12,-21,6,-11]}]
State: {state,[{-13,[12]},{0,[-11,-21,6]}]}
Result: {postcondition,false}
false
The error manifests itself in the call to_list/1 where the order is different from what is expected. We have 12 at priority -13 and then -11, -21, 6 at priority 0. We expect the output to be [12, -11, -21, 6] but it is [12, -21, 6, -11].
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.