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 2.1 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 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
  34 #if defined(__FreeBSD__)
  35 #include <pthread_np.h>
  36 #include <sys/param.h>
  37 #include <sys/cpuset.h>
  38 #endif
  39 #endif
  40 #endif
  41
  42 #include <pulse/util.h>
  43 #include <pulse/timeval.h>
  44 #include <pulse/gccmacro.h>
  45
  46 #include <pulsecore/log.h>
  47 #include <pulsecore/macro.h>
  48 #include <pulsecore/thread.h>
  49 #include <pulsecore/core-util.h>
  50 #include <pulsecore/core-rtclock.h>
  51
  52 static int msec_lower, msec_upper;
  53
  54 static void work(void *p) PA_GCC_NORETURN;
  55
  56 static void work(void *p) {
  57
  58     pa_log_notice("CPU%i: Created thread.", PA_PTR_TO_UINT(p));
  59
  60     pa_make_realtime(12);
  61
  62 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
  63 {
  64 #ifdef __FreeBSD__
  65     cpuset_t mask;
  66 #else
  67     cpu_set_t mask;
  68 #endif
  69
  70     CPU_ZERO(&mask);
  71     CPU_SET((size_t) PA_PTR_TO_UINT(p), &mask);
  72     pa_assert_se(pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) == 0);
  73 }
  74 #endif
  75
  76     for (;;) {
  77         struct timeval now, end;
  78         uint64_t usec;
  79
  80         pa_log_notice("CPU%i: Sleeping for 1s", PA_PTR_TO_UINT(p));
  81         pa_msleep(1000);
  82
  83         usec =
  84             (uint64_t) ((((double) rand())*(double)(msec_upper-msec_lower)*PA_USEC_PER_MSEC)/RAND_MAX) +
  85             (uint64_t) ((uint64_t) msec_lower*PA_USEC_PER_MSEC);
  86
  87         pa_log_notice("CPU%i: Freezing for %ims", PA_PTR_TO_UINT(p), (int) (usec/PA_USEC_PER_MSEC));
  88
  89         pa_rtclock_get(&end);
  90         pa_timeval_add(&end, usec);
  91
  92         do {
  93             pa_rtclock_get(&now);
  94         } while (pa_timeval_cmp(&now, &end) < 0);
  95     }
  96 }
  97
  98 int main(int argc, char*argv[]) {
  99     unsigned n;
 100
 101     pa_log_set_level(PA_LOG_INFO);
 102
 103     srand((unsigned) time(NULL));
 104
 105     if (argc >= 3) {
 106         msec_lower = atoi(argv[1]);
 107         msec_upper = atoi(argv[2]);
 108     } else if (argc >= 2) {
 109         msec_lower = 0;
 110         msec_upper = atoi(argv[1]);
 111     } else {
 112         msec_lower = 0;
 113         msec_upper = 1000;
 114     }
 115
 116     pa_assert(msec_upper > 0);
 117     pa_assert(msec_upper >= msec_lower);
 118
 119     pa_log_notice("Creating random latencies in the range of %ims to %ims.", msec_lower, msec_upper);
 120
 121     for (n = 1; n < pa_ncpus(); n++) {
 122         pa_assert_se(pa_thread_new("rtstutter", work, PA_UINT_TO_PTR(n)));
 123     }
 124
 125     work(PA_INT_TO_PTR(0));
 126
 127     return 0;
 128 }