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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2008 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as
  10   published by the Free Software Foundation; either version 2 of the
  11   License, or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public
  19   License along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <time.h>
  31 #include <sched.h>
  32 #include <inttypes.h>
  33 #include <string.h>
  34 #include <pthread.h>
  35
  36 #include <pulse/timeval.h>
  37 #include <pulse/gccmacro.h>
  38
  39 #include <pulsecore/log.h>
  40 #include <pulsecore/macro.h>
  41
  42 static int msec_lower, msec_upper;
  43
  44 static void* work(void *p) PA_GCC_NORETURN;
  45
  46 static void* work(void *p) {
  47     cpu_set_t mask;
  48     struct sched_param param;
  49
  50     pa_log_notice("CPU%i: Created thread.", PA_PTR_TO_INT(p));
  51
  52     memset(&param, 0, sizeof(param));
  53     param.sched_priority = 12;
  54     pa_assert_se(pthread_setschedparam(pthread_self(), SCHED_FIFO, &param) == 0);
  55
  56     CPU_ZERO(&mask);
  57     CPU_SET(PA_PTR_TO_INT(p), &mask);
  58     pa_assert_se(pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) == 0);
  59
  60     for (;;) {
  61         struct timespec now, end;
  62         uint64_t nsec;
  63
  64         pa_log_notice("CPU%i: Sleeping for 1s", PA_PTR_TO_INT(p));
  65         sleep(1);
  66
  67         pa_assert_se(clock_gettime(CLOCK_REALTIME, &end) == 0);
  68
  69         nsec =
  70             (uint64_t) ((((double) rand())*(msec_upper-msec_lower)*PA_NSEC_PER_MSEC)/RAND_MAX) +
  71             (uint64_t) (msec_lower*PA_NSEC_PER_MSEC);
  72
  73         pa_log_notice("CPU%i: Freezing for %ims", PA_PTR_TO_INT(p), (int) (nsec/PA_NSEC_PER_MSEC));
  74
  75         end.tv_sec += nsec / PA_NSEC_PER_SEC;
  76         end.tv_nsec += nsec % PA_NSEC_PER_SEC;
  77
  78         while ((pa_usec_t) end.tv_nsec > PA_NSEC_PER_SEC) {
  79             end.tv_sec++;
  80             end.tv_nsec -= PA_NSEC_PER_SEC;
  81         }
  82
  83         do {
  84             pa_assert_se(clock_gettime(CLOCK_REALTIME, &now) == 0);
  85         } while (now.tv_sec < end.tv_sec ||
  86                  (now.tv_sec == end.tv_sec && now.tv_nsec < end.tv_nsec));
  87     }
  88 }
  89
  90 int main(int argc, char*argv[]) {
  91     int n;
  92
  93     srand(time(NULL));
  94
  95     if (argc >= 3) {
  96         msec_lower = atoi(argv[1]);
  97         msec_upper = atoi(argv[2]);
  98     } else if (argc >= 2) {
  99         msec_lower = 0;
 100         msec_upper = atoi(argv[1]);
 101     } else {
 102         msec_lower = 0;
 103         msec_upper = 1000;
 104     }
 105
 106     pa_assert(msec_upper > 0);
 107     pa_assert(msec_upper >= msec_lower);
 108
 109     pa_log_notice("Creating random latencies in the range of %ims to  %ims.", msec_lower, msec_upper);
 110
 111     for (n = 1; n < sysconf(_SC_NPROCESSORS_CONF); n++) {
 112         pthread_t t;
 113         pa_assert_se(pthread_create(&t, NULL, work, PA_INT_TO_PTR(n)) == 0);
 114     }
 115
 116     work(PA_INT_TO_PTR(0));
 117
 118     return 0;
 119 }