[gawk-diffs] [SCM] gawk branch, extgawk, updated. 47828911ae88038eda1051cfa2232f46eda95fd8

[Andrew J. Schorr]

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- Log -----------------------------------------------------------------
http://git.sv.gnu.org/cgit/gawk.git/commit/?id=47828911ae88038eda1051cfa2232f46eda95fd8

commit 47828911ae88038eda1051cfa2232f46eda95fd8
Author: Andrew J. Schorr <address@hidden>
Date:   Thu Jun 28 10:37:36 2012 -0400

    Protect against race condition in test/time.awk.

diff --git a/test/ChangeLog b/test/ChangeLog
index a0f7a64..057434f 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,8 @@
+2012-06-28         Andrew J. Schorr     <address@hidden>
+
+       * time.awk: Avoid possibly throwing a spurious error by protecting
+       a race condition that depends on the order of expression evaluation.
+
 2012-06-25         Arnold D. Robbins     <address@hidden>
 
        * Makefile.am (rwarray): New test.
diff --git a/test/time.awk b/test/time.awk
index eeabc7b..517377e 100644
--- a/test/time.awk
+++ b/test/time.awk
@@ -1,10 +1,20 @@
 @load "time"
 
+# make sure gettimeofday() is consistent with systime().  We must call
+# gettimeofday() before systime() to make sure the subtraction gives 0
+# without risk of rolling over to the next second.
+function timecheck(st,res) {
+   res = gettimeofday()
+   st = systime()
+   printf "gettimeofday - systime = %d\n", res-st
+   return res
+}
+
 BEGIN {
    delta = 1.3
-   printf "gettimeofday - systime = %d\n", (t0 = gettimeofday())-systime()
+   t0 = timecheck()
    printf "sleep(%s) = %s\n",delta,sleep(delta)
-   printf "gettimeofday - systime = %d\n", (t1 = gettimeofday())-systime()
+   t1 = timecheck()
    slept = t1-t0
    if ((slept < 0.9*delta) || (slept > 1.3*delta))
       printf "Warning: tried to sleep %.2f secs, but slept for %.2f secs\n",

-----------------------------------------------------------------------

Summary of changes:
 test/ChangeLog |    5 +++++
 test/time.awk  |   14 ++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)


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