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- /*
- * Copyright (C) 2011-2017 Intel Corporation. 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.
- *
- */
- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include "util.h"
- #include "sethread_internal.h"
- int sgx_thread_cond_init(sgx_thread_cond_t *cond, const sgx_thread_condattr_t *unused)
- {
- UNUSED(unused);
- CHECK_PARAMETER(cond);
- cond->m_lock = SGX_SPINLOCK_INITIALIZER;
- QUEUE_INIT(&cond->m_queue);
- return 0;
- }
- int sgx_thread_cond_destroy(sgx_thread_cond_t *cond)
- {
- CHECK_PARAMETER(cond);
- SPIN_LOCK(&cond->m_lock);
- if (QUEUE_FIRST(&cond->m_queue) != SGX_THREAD_T_NULL) {
- SPIN_UNLOCK(&cond->m_lock);
- return EBUSY;
- }
- SPIN_UNLOCK(&cond->m_lock);
- return 0;
- }
- int sgx_thread_cond_wait(sgx_thread_cond_t *cond, sgx_thread_mutex_t *mutex)
- {
- CHECK_PARAMETER(cond);
- CHECK_PARAMETER(mutex);
- sgx_thread_t self = (sgx_thread_t)get_thread_data();
- SPIN_LOCK(&cond->m_lock);
- QUEUE_INSERT_TAIL(&cond->m_queue, self);
- sgx_thread_t waiter = SGX_THREAD_T_NULL;
- int ret = sgx_thread_mutex_unlock_lazy(mutex, &waiter);
- if (ret != 0) {
- SPIN_UNLOCK(&cond->m_lock);
- return ret;
- }
- while (1) {
- sgx_thread_t tmp = SGX_THREAD_T_NULL;
- SPIN_UNLOCK(&cond->m_lock);
- /* OPT: if there is a thread waiting on the mutex, wake it in a single OCALL. */
- if (waiter == SGX_THREAD_T_NULL) {
- sgx_thread_wait_untrusted_event_ocall(&ret, TD2TCS(self));
- } else {
- sgx_thread_setwait_untrusted_events_ocall(&ret, TD2TCS(waiter), TD2TCS(self));
- waiter = SGX_THREAD_T_NULL;
- }
- SPIN_LOCK(&cond->m_lock);
- QUEUE_FOREACH(tmp, &cond->m_queue) {
- if (tmp == self) break; /* stop searching and re-wait outside */
- }
- if (tmp == SGX_THREAD_T_NULL) break; /* current thread isn't in the queue */
- }
- SPIN_UNLOCK(&cond->m_lock);
- sgx_thread_mutex_lock(mutex);
- return 0;
- }
- int sgx_thread_cond_signal(sgx_thread_cond_t *cond)
- {
- int err = 0;
- sgx_thread_t waiter = SGX_THREAD_T_NULL;
- CHECK_PARAMETER(cond);
- SPIN_LOCK(&cond->m_lock);
- if ((waiter = QUEUE_FIRST(&cond->m_queue)) == SGX_THREAD_T_NULL) {
- SPIN_UNLOCK(&cond->m_lock);
- return 0;
- }
- QUEUE_REMOVE_HEAD(&cond->m_queue);
- SPIN_UNLOCK(&cond->m_lock);
- sgx_thread_set_untrusted_event_ocall(&err, TD2TCS(waiter)); /* wake first pending thread */
- return 0;
- }
- int sgx_thread_cond_broadcast(sgx_thread_cond_t *cond)
- {
- size_t n_waiter = 0; int err = 0;
- sgx_thread_t waiter = SGX_THREAD_T_NULL;
- const void **waiters = NULL;
- CHECK_PARAMETER(cond);
- SPIN_LOCK(&cond->m_lock);
- QUEUE_COUNT_ALL(waiter, &cond->m_queue, n_waiter);
- if (n_waiter == 0) {
- SPIN_UNLOCK(&cond->m_lock);
- return 0;
- }
- waiters = (const void **)malloc(n_waiter * sizeof(const void *));
- if (waiters == NULL) {
- SPIN_UNLOCK(&cond->m_lock);
- return ENOMEM;
- }
- const void **tmp = waiters;
- while ((waiter = QUEUE_FIRST(&cond->m_queue)) != SGX_THREAD_T_NULL) {
- QUEUE_REMOVE_HEAD(&cond->m_queue); /* remove the pending thread */
- *tmp++ = TD2TCS(waiter);
- }
- SPIN_UNLOCK(&cond->m_lock);
- sgx_thread_set_multiple_untrusted_events_ocall(&err, waiters, n_waiter); /* wake all pending threads up */
- free(waiters);
- return 0;
- }
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