Merge pull request #1798 from scop/subsec-sleep

rehash: try to sleep in 0.1 sec steps when acquiring lock

libexec/pyenv-rehash

@@ -40,13 +40,14 @@ if [ ! -w "$SHIM_PATH" ]; then
 fi
 
 unset acquired
-for (( i=1; i<="${PYENV_REHASH_TIMEOUT:-60}"; i++ )); do
+start=$SECONDS
+while (( SECONDS <= start + ${PYENV_REHASH_TIMEOUT:-60} )); do
   if acquire_lock 2>/dev/null; then
     acquired=1
     break
   else
-    # POSIX sleep(1) doesn't provides time precision of subsecond
-    sleep 1
+    # POSIX sleep(1) doesn't provide subsecond precision, but many others do
+    sleep 0.1 2>/dev/null || sleep 1
   fi
 done