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 2.1 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 <inttypes.h>
  30
  31 #ifdef HAVE_PTHREAD
  32 #include <pthread.h>
  33 #endif
  34
  35 #include <pulse/util.h>
  36 #include <pulse/timeval.h>
  37 #include <pulse/gccmacro.h>
  38
  39 #include <pulsecore/log.h>
  40 #include <pulsecore/macro.h>
  41 #include <pulsecore/thread.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/core-rtclock.h>
  44
  45 static int msec_lower, msec_upper;
  46
  47 static void work(void *p) PA_GCC_NORETURN;
  48
  49 static void work(void *p) {
  50
  51     pa_log_notice("CPU%i: Created thread.", PA_PTR_TO_UINT(p));
  52
  53     pa_make_realtime(12);
  54
  55 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
  56 {
  57     cpu_set_t mask;
  58
  59     CPU_ZERO(&mask);
  60     CPU_SET((size_t) PA_PTR_TO_UINT(p), &mask);
  61     pa_assert_se(pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) == 0);
  62 }
  63 #endif
  64
  65     for (;;) {
  66         struct timeval now, end;
  67         uint64_t usec;
  68
  69         pa_log_notice("CPU%i: Sleeping for 1s", PA_PTR_TO_UINT(p));
  70         pa_msleep(1000);
  71
  72         usec =
  73             (uint64_t) ((((double) rand())*(double)(msec_upper-msec_lower)*PA_USEC_PER_MSEC)/RAND_MAX) +
  74             (uint64_t) ((uint64_t) msec_lower*PA_USEC_PER_MSEC);
  75
  76         pa_log_notice("CPU%i: Freezing for %ims", PA_PTR_TO_UINT(p), (int) (usec/PA_USEC_PER_MSEC));
  77
  78         pa_rtclock_get(&end);
  79         pa_timeval_add(&end, usec);
  80
  81         do {
  82             pa_rtclock_get(&now);
  83         } while (pa_timeval_cmp(&now, &end) < 0);
  84     }
  85 }
  86
  87 int main(int argc, char*argv[]) {
  88     unsigned n;
  89
  90     pa_log_set_level(PA_LOG_INFO);
  91
  92     srand((unsigned) time(NULL));
  93
  94     if (argc >= 3) {
  95         msec_lower = atoi(argv[1]);
  96         msec_upper = atoi(argv[2]);
  97     } else if (argc >= 2) {
  98         msec_lower = 0;
  99         msec_upper = atoi(argv[1]);
 100     } else {
 101         msec_lower = 0;
 102         msec_upper = 1000;
 103     }
 104
 105     pa_assert(msec_upper > 0);
 106     pa_assert(msec_upper >= msec_lower);
 107
 108     pa_log_notice("Creating random latencies in the range of %ims to %ims.", msec_lower, msec_upper);
 109
 110     for (n = 1; n < pa_ncpus(); n++) {
 111         pa_assert_se(pa_thread_new("rtstutter", work, PA_UINT_TO_PTR(n)));
 112     }
 113
 114     work(PA_INT_TO_PTR(0));
 115
 116     return 0;
 117 }