性能分析

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <google/profiler.h>

//SIGUSR1: start profiling
//SIGUSR2: stop profiling

static void gprof_callback(int signum)
{
  if (signum == SIGUSR1)
    {
      printf("Catch the signal ProfilerStart\n");
      ProfilerStart("bs.prof");
    }
  else if (signum == SIGUSR2)
    {
      printf("Catch the signal ProfilerStop\n");
      ProfilerStop();
    }
}

static void setup_signal()
{
  struct sigaction profstat;
  profstat.sa_handler = gprof_callback;
  profstat.sa_flags = 0;
  sigemptyset(&profstat.sa_mask);
  sigaddset(&profstat.sa_mask, SIGUSR1);
  sigaddset(&profstat.sa_mask, SIGUSR2);

  if ( sigaction(SIGUSR1, &profstat,NULL) < 0 )
    {
      fprintf(stderr, "Fail to connect signal SIGUSR1 with start profiling");
    }
  if ( sigaction(SIGUSR2, &profstat,NULL) < 0 )
    {
      fprintf(stderr, "Fail to connect signal SIGUSR2 with stop profiling");
    }
}

int main(int argc,char** argv)
{
  //
  // ...
  //

  setup_signal();

  //
  // ...
  //
 
  return 0;
}