Increasing timeout for drop writes.

Summary: We have a race in the way test works. We avoided the race by adding the
wait to the counter. I thought 1s was eternity, but that is not true in some
scenarios. Increasing the timeout to 10s and adding warnings.

Also, adding nosleep to avoid the case where the wakeup thread is waiting behind
the sleeping thread for scheduling.

Test Plan: Run make check

Reviewers: siying igorcanadi

CC: leveldb@

Task ID: #7312624

Blame Rev:

db/db_test.cc

@@ -94,9 +94,12 @@ class AtomicCounter {
     while (count_ < count) {
       uint64_t now = env_->NowMicros();
       cond_count_.TimedWait(now + /*1s*/ 1 * 000 * 000);
-      if (env_->NowMicros() - start > /*1s*/ 1 * 000 * 000) {
+      if (env_->NowMicros() - start > /*10s*/ 10 * 000 * 000) {
         return false;
       }
+      if (count_ < count) {
+        GTEST_LOG_(WARNING) << "WaitFor is taking more time than usual";
+      }
     }
 
     return true;
@@ -7553,6 +7556,7 @@ TEST_F(DBTest, DropWrites) {
     // Force out-of-space errors
     env_->drop_writes_.store(true, std::memory_order_release);
     env_->sleep_counter_.Reset();
+    env_->no_sleep_ = true;
     for (int i = 0; i < 5; i++) {
       if (option_config_ != kUniversalCompactionMultiLevel) {
         for (int level = 0; level < dbfull()->NumberLevels(); level++) {