ceph/src/dpdk/examples/performance-thread/common/lthread_cond.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Some portions of this software may have been derived from the
  36  * https://github.com/halayli/lthread which carrys the following license.
  37  *
  38  * Copyright (C) 2012, Hasan Alayli <halayli@gmail.com>
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  */
  61
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <stdint.h>
  66 #include <stddef.h>
  67 #include <limits.h>
  68 #include <inttypes.h>
  69 #include <unistd.h>
  70 #include <pthread.h>
  71 #include <fcntl.h>
  72 #include <sys/time.h>
  73 #include <sys/mman.h>
  74 #include <errno.h>
  75
  76 #include <rte_log.h>
  77 #include <rte_common.h>
  78
  79 #include "lthread_api.h"
  80 #include "lthread_diag_api.h"
  81 #include "lthread_diag.h"
  82 #include "lthread_int.h"
  83 #include "lthread_sched.h"
  84 #include "lthread_queue.h"
  85 #include "lthread_objcache.h"
  86 #include "lthread_timer.h"
  87 #include "lthread_mutex.h"
  88 #include "lthread_cond.h"
  89
  90 /*
  91  * Create a condition variable
  92  */
  93 int
  94 lthread_cond_init(char *name, struct lthread_cond **cond,
  95                   __rte_unused const struct lthread_condattr *attr)
  96 {
  97         struct lthread_cond *c;
  98
  99         if (cond == NULL)
 100                 return POSIX_ERRNO(EINVAL);
 101
 102         /* allocate a condition variable from cache */
 103         c = _lthread_objcache_alloc((THIS_SCHED)->cond_cache);
 104
 105         if (c == NULL)
 106                 return POSIX_ERRNO(EAGAIN);
 107
 108         c->blocked = _lthread_queue_create("blocked");
 109         if (c->blocked == NULL) {
 110                 _lthread_objcache_free((THIS_SCHED)->cond_cache, (void *)c);
 111                 return POSIX_ERRNO(EAGAIN);
 112         }
 113
 114         if (name == NULL)
 115                 strncpy(c->name, "no name", sizeof(c->name));
 116         else
 117                 strncpy(c->name, name, sizeof(c->name));
 118         c->name[sizeof(c->name)-1] = 0;
 119
 120         c->root_sched = THIS_SCHED;
 121
 122         (*cond) = c;
 123         DIAG_CREATE_EVENT((*cond), LT_DIAG_COND_CREATE);
 124         return 0;
 125 }
 126
 127 /*
 128  * Destroy a condition variable
 129  */
 130 int lthread_cond_destroy(struct lthread_cond *c)
 131 {
 132         if (c == NULL) {
 133                 DIAG_EVENT(c, LT_DIAG_COND_DESTROY, c, POSIX_ERRNO(EINVAL));
 134                 return POSIX_ERRNO(EINVAL);
 135         }
 136
 137         /* try to free it */
 138         if (_lthread_queue_destroy(c->blocked) < 0) {
 139                 /* queue in use */
 140                 DIAG_EVENT(c, LT_DIAG_COND_DESTROY, c, POSIX_ERRNO(EBUSY));
 141                 return POSIX_ERRNO(EBUSY);
 142         }
 143
 144         /* okay free it */
 145         _lthread_objcache_free(c->root_sched->cond_cache, c);
 146         DIAG_EVENT(c, LT_DIAG_COND_DESTROY, c, 0);
 147         return 0;
 148 }
 149
 150 /*
 151  * Wait on a condition variable
 152  */
 153 int lthread_cond_wait(struct lthread_cond *c, __rte_unused uint64_t reserved)
 154 {
 155         struct lthread *lt = THIS_LTHREAD;
 156
 157         if (c == NULL) {
 158                 DIAG_EVENT(c, LT_DIAG_COND_WAIT, c, POSIX_ERRNO(EINVAL));
 159                 return POSIX_ERRNO(EINVAL);
 160         }
 161
 162
 163         DIAG_EVENT(c, LT_DIAG_COND_WAIT, c, 0);
 164
 165         /* queue the current thread in the blocked queue
 166          * this will be written when we return to the scheduler
 167          * to ensure that the current thread context is saved
 168          * before any signal could result in it being dequeued and
 169          * resumed
 170          */
 171         lt->pending_wr_queue = c->blocked;
 172         _suspend();
 173
 174         /* the condition happened */
 175         return 0;
 176 }
 177
 178 /*
 179  * Signal a condition variable
 180  * attempt to resume any blocked thread
 181  */
 182 int lthread_cond_signal(struct lthread_cond *c)
 183 {
 184         struct lthread *lt;
 185
 186         if (c == NULL) {
 187                 DIAG_EVENT(c, LT_DIAG_COND_SIGNAL, c, POSIX_ERRNO(EINVAL));
 188                 return POSIX_ERRNO(EINVAL);
 189         }
 190
 191         lt = _lthread_queue_remove(c->blocked);
 192
 193         if (lt != NULL) {
 194                 /* okay wake up this thread */
 195                 DIAG_EVENT(c, LT_DIAG_COND_SIGNAL, c, lt);
 196                 _ready_queue_insert((struct lthread_sched *)lt->sched, lt);
 197         }
 198         return 0;
 199 }
 200
 201 /*
 202  * Broadcast a condition variable
 203  */
 204 int lthread_cond_broadcast(struct lthread_cond *c)
 205 {
 206         struct lthread *lt;
 207
 208         if (c == NULL) {
 209                 DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, POSIX_ERRNO(EINVAL));
 210                 return POSIX_ERRNO(EINVAL);
 211         }
 212
 213         DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, 0);
 214         do {
 215                 /* drain the queue waking everybody */
 216                 lt = _lthread_queue_remove(c->blocked);
 217
 218                 if (lt != NULL) {
 219                         DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, lt);
 220                         /* wake up */
 221                         _ready_queue_insert((struct lthread_sched *)lt->sched,
 222                                             lt);
 223                 }
 224         } while (!_lthread_queue_empty(c->blocked));
 225         _reschedule();
 226         DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, 0);
 227         return 0;
 228 }
 229
 230 /*
 231  * return the diagnostic ref val stored in a condition var
 232  */
 233 uint64_t
 234 lthread_cond_diag_ref(struct lthread_cond *c)
 235 {
 236         if (c == NULL)
 237                 return 0;
 238         return c->diag_ref;
 239 }