Stuck at waitForEvents

[pereverges]

Describe the bug

The code gets stuck in a worker.waitForEvents. I do not understand how this is possible if this is non blocking. Moreover I perform worker.close(), while it is block and it still does not jump to the following line. Any idea why this happens

Steps to Reproduce

• Command line
• UCX version1.16

Setup and versions

• Ubuntu 16.4 + CPU architecture (x86_64)

Additional information (depending on the issue)

• "UCXListener" ../source/configure: line 15969: PKG_PROG_PKG_CONFIG: command not found #16 prio=5 os_prio=0 tid=0x00007fb390001000 nid=0x1c850 runnable [0x00007fb3ccb78000]
  java.lang.Thread.State: RUNNABLE
  at org.openucx.jucx.ucp.UcpWorker.waitWorkerNative(Native Method)
  at org.openucx.jucx.ucp.UcpWorker.waitForEvents(UcpWorker.java:170)
  at es.bsc.comm.ucx.UCXListener.run(UCXListener.java:142)
  while (!this.stop) {
  try {
  try {
  if (worker.progress() == 0) {
  LOGGER.info("Waiting...");
  worker.waitForEvents();
  LOGGER.info("After Waiting..."
  }
  } catch (Exception e) {
  System.out.println("UCX: ERROR " +
  LOGGER.info("UCX: ERROR " + e);
  // worker.cancelRequest(null);
  }
  } catch (Exception e) {
  throw new RuntimeException(e);
  }
  LOGGER.info("RUN EVENTS " + this.stop);
  }

[yosefe]

waitForEvents is calling ucp_worker_wait which is a blocking function call. can you try calling worker.signal() to make it exit?