code.delx.au - pulseaudio/blob - src/tests/rtstutter.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2008 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <time.h>
  29 #include <sched.h>
  30 #include <inttypes.h>
  31 #include <string.h>
  32 #include <pthread.h>
  33
  34 #include <pulse/timeval.h>
  35 #include <pulse/gccmacro.h>
  36
  37 #include <pulsecore/log.h>
  38 #include <pulsecore/macro.h>
  39
  40 static int msec_lower, msec_upper;
  41
  42 static void* work(void *p) PA_GCC_NORETURN;
  43
  44 static void* work(void *p) {
  45     cpu_set_t mask;
  46     struct sched_param param;
  47
  48     pa_log_notice("CPU%i: Created thread.", PA_PTR_TO_INT(p));
  49
  50     memset(&param, 0, sizeof(param));
  51     param.sched_priority = 12;
  52     pa_assert_se(pthread_setschedparam(pthread_self(), SCHED_FIFO, &param) == 0);
  53
  54     CPU_ZERO(&mask);
  55     CPU_SET(PA_PTR_TO_INT(p), &mask);
  56     pa_assert_se(pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) == 0);
  57
  58     for (;;) {
  59         struct timespec now, end;
  60         uint64_t nsec;
  61
  62         pa_log_notice("CPU%i: Sleeping for 1s", PA_PTR_TO_INT(p));
  63         sleep(1);
  64
  65         pa_assert_se(clock_gettime(CLOCK_REALTIME, &end) == 0);
  66
  67         nsec =
  68             (uint64_t) ((((double) rand())*(msec_upper-msec_lower)*PA_NSEC_PER_MSEC)/RAND_MAX) +
  69             (uint64_t) (msec_lower*PA_NSEC_PER_MSEC);
  70
  71         pa_log_notice("CPU%i: Freezing for %ims", PA_PTR_TO_INT(p), (int) (nsec/PA_NSEC_PER_MSEC));
  72
  73         end.tv_sec += nsec / PA_NSEC_PER_SEC;
  74         end.tv_nsec += nsec % PA_NSEC_PER_SEC;
  75
  76         while ((pa_usec_t) end.tv_nsec > PA_NSEC_PER_SEC) {
  77             end.tv_sec++;
  78             end.tv_nsec -= PA_NSEC_PER_SEC;
  79         }
  80
  81         do {
  82             pa_assert_se(clock_gettime(CLOCK_REALTIME, &now) == 0);
  83         } while (now.tv_sec < end.tv_sec ||
  84                  (now.tv_sec == end.tv_sec && now.tv_nsec < end.tv_nsec));
  85     }
  86 }
  87
  88 int main(int argc, char*argv[]) {
  89     int n;
  90
  91     srand(time(NULL));
  92
  93     if (argc >= 3) {
  94         msec_lower = atoi(argv[1]);
  95         msec_upper = atoi(argv[2]);
  96     } else if (argc >= 2) {
  97         msec_lower = 0;
  98         msec_upper = atoi(argv[1]);
  99     } else {
 100         msec_lower = 0;
 101         msec_upper = 1000;
 102     }
 103
 104     pa_assert(msec_upper > 0);
 105     pa_assert(msec_upper >= msec_lower);
 106
 107     pa_log_notice("Creating random latencies in the range of %ims to  %ims.", msec_lower, msec_upper);
 108
 109     for (n = 1; n < sysconf(_SC_NPROCESSORS_CONF); n++) {
 110         pthread_t t;
 111         pa_assert_se(pthread_create(&t, NULL, work, PA_INT_TO_PTR(n)) == 0);
 112     }
 113
 114     work(PA_INT_TO_PTR(0));
 115
 116     return 0;
 117 }