external/bsd/bind/dist/lib/isc/pthreads/thread.c

   1 /*      $NetBSD: thread.c,v 1.6 2014/12/10 04:38:00 christos Exp $      */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2013  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001, 2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: thread.c,v 1.17 2007/06/19 23:47:18 tbox Exp  */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #if defined(HAVE_SCHED_H)
  27 #include <sched.h>
  28 #endif
  29
  30 #include <isc/thread.h>
  31 #include <isc/util.h>
  32
  33 #ifndef THREAD_MINSTACKSIZE
  34 #define THREAD_MINSTACKSIZE             (1024U * 1024)
  35 #endif
  36
  37 isc_result_t
  38 isc_thread_create(isc_threadfunc_t func, isc_threadarg_t arg,
  39                   isc_thread_t *thread)
  40 {
  41         pthread_attr_t attr;
  42         size_t stacksize;
  43         int ret;
  44
  45         pthread_attr_init(&attr);
  46
  47 #if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \
  48     defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE)
  49         ret = pthread_attr_getstacksize(&attr, &stacksize);
  50         if (ret != 0)
  51                 return (ISC_R_UNEXPECTED);
  52
  53         if (stacksize < THREAD_MINSTACKSIZE) {
  54                 ret = pthread_attr_setstacksize(&attr, THREAD_MINSTACKSIZE);
  55                 if (ret != 0)
  56                         return (ISC_R_UNEXPECTED);
  57         }
  58 #endif
  59
  60 #if defined(PTHREAD_SCOPE_SYSTEM) && defined(NEED_PTHREAD_SCOPE_SYSTEM)
  61         ret = pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
  62         if (ret != 0)
  63                 return (ISC_R_UNEXPECTED);
  64 #endif
  65
  66         ret = pthread_create(thread, &attr, func, arg);
  67         if (ret != 0)
  68                 return (ISC_R_UNEXPECTED);
  69
  70         pthread_attr_destroy(&attr);
  71
  72         return (ISC_R_SUCCESS);
  73 }
  74
  75 void
  76 isc_thread_setconcurrency(unsigned int level) {
  77 #if defined(CALL_PTHREAD_SETCONCURRENCY)
  78         (void)pthread_setconcurrency(level);
  79 #else
  80         UNUSED(level);
  81 #endif
  82 }
  83
  84 void
  85 isc_thread_yield(void) {
  86 #if defined(HAVE_SCHED_YIELD)
  87         sched_yield();
  88 #elif defined( HAVE_PTHREAD_YIELD)
  89         pthread_yield();
  90 #elif defined( HAVE_PTHREAD_YIELD_NP)
  91         pthread_yield_np();
  92 #endif
  93 }