Proglem doing CA calls after catching a signal

[Robert Soliday <soliday@aps.anl.gov>]

After upgrading to Epics/Base 3.14.6 from 3.13.10 I am having difficulty 
handling signals. In one of our applications if the user does a 
control-C it is suppose to trap the signal and restore the PVs to their 
original values. Odds are the control-c will occur while in a 
ca_pend_event call. When I go to do a ca_pend_io in the interrupt 
handler I get the error:

pthread_mutex_unlock failed: error Not owner
fatal error: epicsMutexOsdUnlock

I have included a simple program that displays the same problem. If 
anyone knows the proper way of doing CA calls after catching a signal 
please let me know.

Thanks,
--Bob Soliday



#include <stdio.h>
#include <strings.h>
#include <cadef.h>
#include <signal.h>

void interrupt_handler(int);

chid channelID[1];
char names[1][40];

int main(int argc, char **argv)
{
  strcpy(names[0], "oag:H1:setCurrentC");

  ca_task_initialize();
  if (ca_search(names[0], &channelID[0])!=ECA_NORMAL) {
    fprintf(stderr, "error: search failed for PV\n");
    return(1);
  }
  if (ca_pend_io(10)!=ECA_NORMAL) {
    fprintf(stderr, "error: search failed for PV\n");
    return(1);
  }
  fprintf(stdout, "Found PV\n");
  signal(SIGINT, interrupt_handler);
  ca_pend_event(10);
  ca_task_exit();
  fprintf(stdout, "Done\n");
  return(0);
}

void interrupt_handler(int sig) {
  double value;
  fprintf(stdout, "Interrupt detected\n");
  if (ca_get(DBR_DOUBLE, channelID[0], &value)!=ECA_NORMAL) {
    fprintf(stderr, "Error: unable to get value for PV\n");
  }
  if (ca_pend_io(10)!=ECA_NORMAL) {
    fprintf(stderr, "Error: unable to get value for PV\n");
  }
  fprintf(stdout, "value = %lf\n", value);
}