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       1                 :            : /***
       2                 :            :   This file is part of PulseAudio.
       3                 :            : 
       4                 :            :   Copyright 2009 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 <pulse/rtclock.h>
      27                 :            : 
      28                 :            : #include <pulsecore/log.h>
      29                 :            : #include <pulsecore/mutex.h>
      30                 :            : 
      31                 :            : #include "ratelimit.h"
      32                 :            : 
      33                 :            : static pa_static_mutex mutex = PA_STATIC_MUTEX_INIT;
      34                 :            : 
      35                 :            : /* Modelled after Linux' lib/ratelimit.c by Dave Young
      36                 :            :  * <hidave.darkstar@gmail.com>, which is licensed GPLv2. */
      37                 :            : 
      38                 :          0 : pa_bool_t pa_ratelimit_test(pa_ratelimit *r, pa_log_level_t t) {
      39                 :            :     pa_usec_t now;
      40                 :            :     pa_mutex *m;
      41                 :            : 
      42                 :          0 :     now = pa_rtclock_now();
      43                 :            : 
      44                 :          0 :     m = pa_static_mutex_get(&mutex, FALSE, FALSE);
      45                 :          0 :     pa_mutex_lock(m);
      46                 :            : 
      47         [ #  # ]:          0 :     pa_assert(r);
      48         [ #  # ]:          0 :     pa_assert(r->interval > 0);
      49         [ #  # ]:          0 :     pa_assert(r->burst > 0);
      50                 :            : 
      51 [ #  # ][ #  # ]:          0 :     if (r->begin <= 0 ||
      52                 :          0 :         r->begin + r->interval < now) {
      53                 :            : 
      54         [ #  # ]:          0 :         if (r->n_missed > 0)
      55                 :          0 :             pa_logl(t, "%u events suppressed", r->n_missed);
      56                 :            : 
      57                 :          0 :         r->begin = now;
      58                 :            : 
      59                 :            :         /* Reset counters */
      60                 :          0 :         r->n_printed = 0;
      61                 :          0 :         r->n_missed = 0;
      62                 :          0 :         goto good;
      63                 :            :     }
      64                 :            : 
      65         [ #  # ]:          0 :     if (r->n_printed <= r->burst)
      66                 :            :         goto good;
      67                 :            : 
      68                 :          0 :     r->n_missed++;
      69                 :          0 :     pa_mutex_unlock(m);
      70                 :          0 :     return FALSE;
      71                 :            : 
      72                 :            : good:
      73                 :          0 :     r->n_printed++;
      74                 :          0 :     pa_mutex_unlock(m);
      75                 :          0 :     return TRUE;
      76                 :            : }