Re: possible bug
That works. Thanks! take care, Mike On Sep 14, 1:38 am, Meikel Brandmeyer wrote: > Hi, > > I can reproduce it with 1.2 and 1.3.0-master-20100911.130147-5. And I > think I know, what the problem is: You must not recur out of a > binding. The binding implicitely contains a try with cleanup code in > the finally clause. It seems that recur bypasses the finally and > executes again the binding. This pushes another frame of the bindings > onto the stack, but the old frame is not popped. When the exception is > thrown, the finally part gets executed and one frame is popped, but > the additional frames remain. The stack of bindings is now out of > sync. Hence your result. Throwing the exception in the first iteration > will leave the bindings stack intact. > > user=> (binding [x [1 2 3]] (loop [c 0] (binding [y [4 5 6]] (throw > (Exception. "BOOOM") > Exception BOOOM user/eval13 (NO_SOURCE_FILE:9) > user=> x > IllegalStateException Var user/x is unbound. clojure.lang.Var.deref > (Var.java:142) > user=> y > IllegalStateException Var user/y is unbound. clojure.lang.Var.deref > (Var.java:142) > > Please find the following code, which works as expected: > > (defn test-fixed-nested-binding > [] > (binding [x [0 1 2 3 4 5 6]] > (try > (binding [y [7 8 9]] > (loop [c 0] > (change-value-of-thread-local-var) > (throw-random-exception c) > (recur (inc c > (catch Exception e (println (str x "\n" (.getMessage e))) > > Since recur is local, I think "don't do it" is a valid short- to mid- > term fix. > > Sincerely > Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: possible bug
OK, I upgraded to 1.3.0-master-SNAPSHOT but I am still getting a bound x and y after running the test-nested-binding function. There must be something else not quite right. for my REPL I am using: ubuntu linux 10.04 java sdk 1.6.0_21 clojure 1.3.0-master-SNAPSHOT clojure-contrib 1.3.0-SNAPSHOT jLine 0.9.95-SNAPSHOT here is a cut/paste of what I did at the repl: --- Clojure 1.3.0-master-SNAPSHOT user=> (load-file "TestBinding.clj") #'user/test-nested-binding user=> (test-binding) [0 1 2 3 4 5 6 40 80 19 72 31 73 40 61 99 25 13 14 91 81 22 94 87 25 33 11 60 3 6 14 13 77 94 77 83 16 88 38 7 59 79 74 5 98 57 95 90 86 14 64 63 2 34 52 30 86 72 14 25 7 54 83 53 86 66 57 86 55 52 97 8 20 3 21 7 6 66 73 48 16 43 3 43 91 42 21 49 95 25 31 71 4 21 18 78 79 1 57 55 76 42 82 99 49 54 41 3 34 27 26 65 33 37 68 18 88 64 23 81 13 99 55 14 94 61 35 36 32 54 97 26 34 8 26 60 7 97 38 18 84 24 74 57 95 67 4 18 25 75 42 21 75 87 21 94 82 64 80 56 28 34 88 42 3 13 20 28 97 87 68 76 46 33 38 33 22 9 97 37 63 26 13 9 55 52 91 55 74 12 99 69 4 96 0 9 54 60 41 82 4 0 99 24 38 30 74] Random Exception after count = 199 nil user=> x IllegalStateException Var user/x is unbound. clojure.lang.Var.deref (Var.java:142) user=> (test-nested-binding) [0 1 2 3 4 5 6 52 76 96 80 15 52 35 56 66 78 59 72 36 80 59 52 15 56 65 92 41 68 59 64 42 40 77 78 95 34 51 28 23 99 40 45 2 82 21 11 6 52 28 28 98 19 76 90 79 87 65 71 35 19 29 1 52 96 94 51 49 69 24 54 76 87 88 52 48 64 56 71 64 72 86 22 37 63 10 85 20] Random Exception after count = 80 nil user=> x [0 1 2 3 4 5 6 52 76 96 80 15 52 35 56 66 78 59 72 36 80 59 52 15 56 65 92 41 68 59 64 42 40 77 78 95 34 51 28 23 99 40 45 2 82 21 11 6 52 28 28 98 19 76 90 79 87 65 71 35 19 29 1 52 96 94 51 49 69 24 54 76 87 88 52 48 64 56 71 64 72 86 22 37 63 10 85 20] user=> (clojure-version) "1.3.0-master-SNAPSHOT" user=> --- (I also ran this with just a plain clojure repl (no contrib or jline jars in the classpath)) thanks for any help take care, Mike On Sep 13, 11:37 am, doc wrote: > it was on 1.2.0-master but I will upgrade to 1.3.0-master > > thanks! :-) > > On Sep 13, 3:01 am, Chouser wrote: > > > On Sun, Sep 12, 2010 at 3:58 PM, doc wrote: > > > Hello, > > > > I am relatively new to clojure and lispy languages in general. I > > > wrote a small program that manipulated thread vars using the binding > > > macro and I am seeing what seems to be strange behavior. > > > > To illustrate, here is another small program that reproduces what I am > > > seeing (without all the distraction of the original). There is a > > > reason for the nested bindings in the original code where it seems a > > > bit contrived here. Regardless, if it is something I am doing wrong, > > > please let me know. > > > > > > > > (declare x y) > > > > (def rnd1 (java.util.Random.)) > > > (def rnd2 (java.util.Random.)) > > > > (defn throw-random-exception [c] > > > (let [value (.nextInt rnd1 100)] > > > (if (= value 50) > > > (throw (Exception. (str "Random Exception after count = " > > > c)) > > > > (defn change-value-of-thread-local-var [] > > > (set! x (conj x (.nextInt rnd2 100 > > > > (defn test-binding [] > > > (binding [x [0 1 2 3 4 5 6]] > > > (try > > > (loop [c 0] > > > (do > > > (change-value-of-thread-local-var) > > > (throw-random-exception c)) > > > (recur (inc c))) > > > (catch Exception e (println (str x "\n" (.getMessage e))) > > > > (defn test-nested-binding [] > > > (binding [x [0 1 2 3 4 5 6]] > > > (try > > > (loop [c 0] > > > (binding [y [7 8 9]] > > > (do > > > (change-value-of-thread-local-var) > > > (throw-random-exception c)) > > > (recur (inc c > > > (catch Exception e (println (str x "\n" (.getMessage e))) > > > > > > > > If I load this as a file at the REPL and then run "(test-binding)" the > > > value of x is unbound when the function returns. However if you run > > > "(test-nested-binding)" then the value of BOTH x and y have a bound > > > value when the function returns. Is this a bug? If so, where do I > > > report it? If not, what am I doing wrong? I have also moved the > > > binding of x inside the "try" and it has the same behavior. > > > For me, x and y are unbound after running either function on a recent >
Re: possible bug
I sent a reply earlier but I don't think it went through. I tried it again with 1.3.0-master-SNAPSHOT and it still had x and y bound after the test-nested-binding function ran. Not sure what I am doing wrong or have misconfigured? Any insight would be appreciated. take care, Mike On Sep 13, 11:37 am, doc wrote: > it was on 1.2.0-master but I will upgrade to 1.3.0-master > > thanks! :-) > > On Sep 13, 3:01 am, Chouser wrote: > > > On Sun, Sep 12, 2010 at 3:58 PM, doc wrote: > > > Hello, > > > > I am relatively new to clojure and lispy languages in general. I > > > wrote a small program that manipulated thread vars using the binding > > > macro and I am seeing what seems to be strange behavior. > > > > To illustrate, here is another small program that reproduces what I am > > > seeing (without all the distraction of the original). There is a > > > reason for the nested bindings in the original code where it seems a > > > bit contrived here. Regardless, if it is something I am doing wrong, > > > please let me know. > > > > > > > > (declare x y) > > > > (def rnd1 (java.util.Random.)) > > > (def rnd2 (java.util.Random.)) > > > > (defn throw-random-exception [c] > > > (let [value (.nextInt rnd1 100)] > > > (if (= value 50) > > > (throw (Exception. (str "Random Exception after count = " > > > c)) > > > > (defn change-value-of-thread-local-var [] > > > (set! x (conj x (.nextInt rnd2 100 > > > > (defn test-binding [] > > > (binding [x [0 1 2 3 4 5 6]] > > > (try > > > (loop [c 0] > > > (do > > > (change-value-of-thread-local-var) > > > (throw-random-exception c)) > > > (recur (inc c))) > > > (catch Exception e (println (str x "\n" (.getMessage e))) > > > > (defn test-nested-binding [] > > > (binding [x [0 1 2 3 4 5 6]] > > > (try > > > (loop [c 0] > > > (binding [y [7 8 9]] > > > (do > > > (change-value-of-thread-local-var) > > > (throw-random-exception c)) > > > (recur (inc c > > > (catch Exception e (println (str x "\n" (.getMessage e))) > > > > > > > > If I load this as a file at the REPL and then run "(test-binding)" the > > > value of x is unbound when the function returns. However if you run > > > "(test-nested-binding)" then the value of BOTH x and y have a bound > > > value when the function returns. Is this a bug? If so, where do I > > > report it? If not, what am I doing wrong? I have also moved the > > > binding of x inside the "try" and it has the same behavior. > > > For me, x and y are unbound after running either function on a recent > > master branch of Clojure. What version of Clojure are you using? > > > user=> (clojure-version) > > "1.3.0-master-SNAPSHOT" > > > If you're using something earlier than the 1.2 release, I'd suggest > > you upgrade to 1.2 and try again. > > > --Chouserhttp://joyofclojure.com/ -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: possible bug
it was on 1.2.0-master but I will upgrade to 1.3.0-master thanks! :-) On Sep 13, 3:01 am, Chouser wrote: > On Sun, Sep 12, 2010 at 3:58 PM, doc wrote: > > Hello, > > > I am relatively new to clojure and lispy languages in general. I > > wrote a small program that manipulated thread vars using the binding > > macro and I am seeing what seems to be strange behavior. > > > To illustrate, here is another small program that reproduces what I am > > seeing (without all the distraction of the original). There is a > > reason for the nested bindings in the original code where it seems a > > bit contrived here. Regardless, if it is something I am doing wrong, > > please let me know. > > > > > > (declare x y) > > > (def rnd1 (java.util.Random.)) > > (def rnd2 (java.util.Random.)) > > > (defn throw-random-exception [c] > > (let [value (.nextInt rnd1 100)] > > (if (= value 50) > > (throw (Exception. (str "Random Exception after count = " > > c)) > > > (defn change-value-of-thread-local-var [] > > (set! x (conj x (.nextInt rnd2 100 > > > (defn test-binding [] > > (binding [x [0 1 2 3 4 5 6]] > > (try > > (loop [c 0] > > (do > > (change-value-of-thread-local-var) > > (throw-random-exception c)) > > (recur (inc c))) > > (catch Exception e (println (str x "\n" (.getMessage e))) > > > (defn test-nested-binding [] > > (binding [x [0 1 2 3 4 5 6]] > > (try > > (loop [c 0] > > (binding [y [7 8 9]] > > (do > > (change-value-of-thread-local-var) > > (throw-random-exception c)) > > (recur (inc c > > (catch Exception e (println (str x "\n" (.getMessage e))) > > > > > > If I load this as a file at the REPL and then run "(test-binding)" the > > value of x is unbound when the function returns. However if you run > > "(test-nested-binding)" then the value of BOTH x and y have a bound > > value when the function returns. Is this a bug? If so, where do I > > report it? If not, what am I doing wrong? I have also moved the > > binding of x inside the "try" and it has the same behavior. > > For me, x and y are unbound after running either function on a recent > master branch of Clojure. What version of Clojure are you using? > > user=> (clojure-version) > "1.3.0-master-SNAPSHOT" > > If you're using something earlier than the 1.2 release, I'd suggest > you upgrade to 1.2 and try again. > > --Chouserhttp://joyofclojure.com/ -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
possible bug
Hello, I am relatively new to clojure and lispy languages in general. I wrote a small program that manipulated thread vars using the binding macro and I am seeing what seems to be strange behavior. To illustrate, here is another small program that reproduces what I am seeing (without all the distraction of the original). There is a reason for the nested bindings in the original code where it seems a bit contrived here. Regardless, if it is something I am doing wrong, please let me know. (declare x y) (def rnd1 (java.util.Random.)) (def rnd2 (java.util.Random.)) (defn throw-random-exception [c] (let [value (.nextInt rnd1 100)] (if (= value 50) (throw (Exception. (str "Random Exception after count = " c)) (defn change-value-of-thread-local-var [] (set! x (conj x (.nextInt rnd2 100 (defn test-binding [] (binding [x [0 1 2 3 4 5 6]] (try (loop [c 0] (do (change-value-of-thread-local-var) (throw-random-exception c)) (recur (inc c))) (catch Exception e (println (str x "\n" (.getMessage e))) (defn test-nested-binding [] (binding [x [0 1 2 3 4 5 6]] (try (loop [c 0] (binding [y [7 8 9]] (do (change-value-of-thread-local-var) (throw-random-exception c)) (recur (inc c (catch Exception e (println (str x "\n" (.getMessage e))) If I load this as a file at the REPL and then run "(test-binding)" the value of x is unbound when the function returns. However if you run "(test-nested-binding)" then the value of BOTH x and y have a bound value when the function returns. Is this a bug? If so, where do I report it? If not, what am I doing wrong? I have also moved the binding of x inside the "try" and it has the same behavior. thanks, take care, Mike -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
