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 <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 #include <pulsecore/core-util.h>
  40
  41 static int msec_lower, msec_upper;
  42
  43 static void* work(void *p) PA_GCC_NORETURN;
  44
  45 static void* work(void *p) {
  46 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
  47     cpu_set_t mask;
  48 #endif
  49     struct sched_param param;
  50
  51     pa_log_notice("CPU%i: Created thread.", PA_PTR_TO_UINT(p));
  52
  53     memset(&param, 0, sizeof(param));
  54     param.sched_priority = 12;
  55     pa_assert_se(pthread_setschedparam(pthread_self(), SCHED_FIFO, &param) == 0);
  56
  57 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
  58     CPU_ZERO(&mask);
  59     CPU_SET((size_t) PA_PTR_TO_UINT(p), &mask);
  60     pa_assert_se(pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) == 0);
  61 #endif
  62
  63     for (;;) {
  64         struct timespec now, end;
  65         uint64_t nsec;
  66
  67         pa_log_notice("CPU%i: Sleeping for 1s", PA_PTR_TO_UINT(p));
  68         sleep(1);
  69
  70         pa_assert_se(clock_gettime(CLOCK_REALTIME, &end) == 0);
  71
  72         nsec =
  73             (uint64_t) ((((double) rand())*(double)(msec_upper-msec_lower)*PA_NSEC_PER_MSEC)/RAND_MAX) +
  74             (uint64_t) ((uint64_t) msec_lower*PA_NSEC_PER_MSEC);
  75
  76         pa_log_notice("CPU%i: Freezing for %ims", PA_PTR_TO_UINT(p), (int) (nsec/PA_NSEC_PER_MSEC));
  77
  78         end.tv_sec += (time_t) (nsec / PA_NSEC_PER_SEC);
  79         end.tv_nsec += (long int) (nsec % PA_NSEC_PER_SEC);
  80
  81         while ((pa_usec_t) end.tv_nsec > PA_NSEC_PER_SEC) {
  82             end.tv_sec++;
  83             end.tv_nsec -= (long int) PA_NSEC_PER_SEC;
  84         }
  85
  86         do {
  87             pa_assert_se(clock_gettime(CLOCK_REALTIME, &now) == 0);
  88         } while (now.tv_sec < end.tv_sec ||
  89                  (now.tv_sec == end.tv_sec && now.tv_nsec < end.tv_nsec));
  90     }
  91 }
  92
  93 int main(int argc, char*argv[]) {
  94     unsigned n;
  95
  96     pa_log_set_level(PA_LOG_DEBUG);
  97
  98     srand((unsigned) time(NULL));
  99
 100     if (argc >= 3) {
 101         msec_lower = atoi(argv[1]);
 102         msec_upper = atoi(argv[2]);
 103     } else if (argc >= 2) {
 104         msec_lower = 0;
 105         msec_upper = atoi(argv[1]);
 106     } else {
 107         msec_lower = 0;
 108         msec_upper = 1000;
 109     }
 110
 111     pa_assert(msec_upper > 0);
 112     pa_assert(msec_upper >= msec_lower);
 113
 114     pa_log_notice("Creating random latencies in the range of %ims to  %ims.", msec_lower, msec_upper);
 115
 116     for (n = 1; n < pa_ncpus(); n++) {
 117         pthread_t t;
 118         pa_assert_se(pthread_create(&t, NULL, work, PA_UINT_TO_PTR(n)) == 0);
 119     }
 120
 121     work(PA_INT_TO_PTR(0));
 122
 123     return 0;
 124 }