cleanUp();
      }
    }

    /**
     * Performs routine cleanup prior to executing a write. This should be called every time a write
     * thread acquires the segment lock, immediately after acquiring the lock.
     *
     * <p>Post-condition: expireEntries has been run.
     */
    @GuardedBy("this")
    void preWriteCleanup(long now) {

func (rt *requestTracker) trackParallelRequests() {
	if !rt.shouldTrackParallelRequests {
		// do not track parallel requests unless specifically enabled
		return
	}
	if rt.parallelLock.TryLock() {
		// lock acquired: we are the only or the first concurrent request
		// initialize the next set of parallel requests
		rt.parallelRequests = 1
	} else {
		// lock is held by other requests

	}

	cmdArgs = append(cmdArgs, "-x", "c", "-", "-o", tmp)

	if cfg.BuildN {
		sh.ShowCmd(b.WorkDir, "%s || true", joinUnambiguously(cmdArgs))
		return false
	}

	// gccCompilerID acquires b.exec, so do before acquiring lock.
	compilerID, cacheOK := b.gccCompilerID(compiler[0])

	b.exec.Lock()
	defer b.exec.Unlock()
	if b, ok := b.flagCache[key]; ok {
		return b
	}

        cleanUp();
      }
    }

    /**
     * Performs routine cleanup prior to executing a write. This should be called every time a write
     * thread acquires the segment lock, immediately after acquiring the lock.
     *
     * <p>Post-condition: expireEntries has been run.
     */
    @GuardedBy("this")
    void preWriteCleanup(long now) {

              "type": "string",
              "uniqueItems": true
            }
          },
          {
            "description": "Force is going to \"force\" Apply requests. It means user will re-acquire conflicting fields owned by other people. Force flag must be unset for non-apply patch requests.",
            "in": "query",
            "name": "force",
            "schema": {
              "type": "boolean",

              "type": "string",
              "uniqueItems": true
            }
          },
          {
            "description": "Force is going to \"force\" Apply requests. It means user will re-acquire conflicting fields owned by other people. Force flag must be unset for non-apply patch requests.",
            "in": "query",
            "name": "force",
            "schema": {
              "type": "boolean",