Merge pull request #12 from flox/fix/sleep-between-flushes

fix: move midline-flush.c sleep to occur between flush() invocations

Author: ysndr

.flox/env/manifest.lock

@@ -39,9 +39,6 @@
     "build": {
       "t3": {
         "command": "  make\n  make test\n  make install PREFIX=$out\n",
-        "files": null,
-        "runtime-packages": null,
-        "systems": null,
         "sandbox": "pure"
       }
     }

tests/midline-flush.c

@@ -16,11 +16,13 @@ int main() {
     fflush(stdout);
     fflush(stderr);
     goodbye(stderr);
-    usleep(30); // It only takes a millisecond to give stderr a head start
-                // but we'll give it thirty to avoid false positives where
-                // the first line is written to stdout.
     goodbye(stdout);
     fflush(stderr);
+    usleep(10); // It only takes a millisecond to give stderr a head start
+                // but we'll give it ten to avoid false positives where the
+                // first line is written to stdout.
     fflush(stdout);
+    usleep(10); // Sleep once more to ensure that stdout has a chance to
+                // flush its buffer before the subsequent test runs.
     return 0;
 }