--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Some portions of this software may have been derived from the
+ * https://github.com/halayli/lthread which carrys the following license.
+ *
+ * Copyright (C) 2012, Hasan Alayli <halayli@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <sys/mman.h>
+#include <errno.h>
+
+#include <rte_log.h>
+#include <rte_common.h>
+
+#include "lthread_api.h"
+#include "lthread_diag_api.h"
+#include "lthread_diag.h"
+#include "lthread_int.h"
+#include "lthread_sched.h"
+#include "lthread_queue.h"
+#include "lthread_objcache.h"
+#include "lthread_timer.h"
+#include "lthread_mutex.h"
+#include "lthread_cond.h"
+
+/*
+ * Create a condition variable
+ */
+int
+lthread_cond_init(char *name, struct lthread_cond **cond,
+ __rte_unused const struct lthread_condattr *attr)
+{
+ struct lthread_cond *c;
+
+ if (cond == NULL)
+ return POSIX_ERRNO(EINVAL);
+
+ /* allocate a condition variable from cache */
+ c = _lthread_objcache_alloc((THIS_SCHED)->cond_cache);
+
+ if (c == NULL)
+ return POSIX_ERRNO(EAGAIN);
+
+ c->blocked = _lthread_queue_create("blocked");
+ if (c->blocked == NULL) {
+ _lthread_objcache_free((THIS_SCHED)->cond_cache, (void *)c);
+ return POSIX_ERRNO(EAGAIN);
+ }
+
+ if (name == NULL)
+ strncpy(c->name, "no name", sizeof(c->name));
+ else
+ strncpy(c->name, name, sizeof(c->name));
+ c->name[sizeof(c->name)-1] = 0;
+
+ c->root_sched = THIS_SCHED;
+
+ (*cond) = c;
+ DIAG_CREATE_EVENT((*cond), LT_DIAG_COND_CREATE);
+ return 0;
+}
+
+/*
+ * Destroy a condition variable
+ */
+int lthread_cond_destroy(struct lthread_cond *c)
+{
+ if (c == NULL) {
+ DIAG_EVENT(c, LT_DIAG_COND_DESTROY, c, POSIX_ERRNO(EINVAL));
+ return POSIX_ERRNO(EINVAL);
+ }
+
+ /* try to free it */
+ if (_lthread_queue_destroy(c->blocked) < 0) {
+ /* queue in use */
+ DIAG_EVENT(c, LT_DIAG_COND_DESTROY, c, POSIX_ERRNO(EBUSY));
+ return POSIX_ERRNO(EBUSY);
+ }
+
+ /* okay free it */
+ _lthread_objcache_free(c->root_sched->cond_cache, c);
+ DIAG_EVENT(c, LT_DIAG_COND_DESTROY, c, 0);
+ return 0;
+}
+
+/*
+ * Wait on a condition variable
+ */
+int lthread_cond_wait(struct lthread_cond *c, __rte_unused uint64_t reserved)
+{
+ struct lthread *lt = THIS_LTHREAD;
+
+ if (c == NULL) {
+ DIAG_EVENT(c, LT_DIAG_COND_WAIT, c, POSIX_ERRNO(EINVAL));
+ return POSIX_ERRNO(EINVAL);
+ }
+
+
+ DIAG_EVENT(c, LT_DIAG_COND_WAIT, c, 0);
+
+ /* queue the current thread in the blocked queue
+ * this will be written when we return to the scheduler
+ * to ensure that the current thread context is saved
+ * before any signal could result in it being dequeued and
+ * resumed
+ */
+ lt->pending_wr_queue = c->blocked;
+ _suspend();
+
+ /* the condition happened */
+ return 0;
+}
+
+/*
+ * Signal a condition variable
+ * attempt to resume any blocked thread
+ */
+int lthread_cond_signal(struct lthread_cond *c)
+{
+ struct lthread *lt;
+
+ if (c == NULL) {
+ DIAG_EVENT(c, LT_DIAG_COND_SIGNAL, c, POSIX_ERRNO(EINVAL));
+ return POSIX_ERRNO(EINVAL);
+ }
+
+ lt = _lthread_queue_remove(c->blocked);
+
+ if (lt != NULL) {
+ /* okay wake up this thread */
+ DIAG_EVENT(c, LT_DIAG_COND_SIGNAL, c, lt);
+ _ready_queue_insert((struct lthread_sched *)lt->sched, lt);
+ }
+ return 0;
+}
+
+/*
+ * Broadcast a condition variable
+ */
+int lthread_cond_broadcast(struct lthread_cond *c)
+{
+ struct lthread *lt;
+
+ if (c == NULL) {
+ DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, POSIX_ERRNO(EINVAL));
+ return POSIX_ERRNO(EINVAL);
+ }
+
+ DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, 0);
+ do {
+ /* drain the queue waking everybody */
+ lt = _lthread_queue_remove(c->blocked);
+
+ if (lt != NULL) {
+ DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, lt);
+ /* wake up */
+ _ready_queue_insert((struct lthread_sched *)lt->sched,
+ lt);
+ }
+ } while (!_lthread_queue_empty(c->blocked));
+ _reschedule();
+ DIAG_EVENT(c, LT_DIAG_COND_BROADCAST, c, 0);
+ return 0;
+}
+
+/*
+ * return the diagnostic ref val stored in a condition var
+ */
+uint64_t
+lthread_cond_diag_ref(struct lthread_cond *c)
+{
+ if (c == NULL)
+ return 0;
+ return c->diag_ref;
+}
Code Review / deb_dpdk.git / blobdiff