mirror of
https://github.com/intel/linux-sgx
synced 2026-06-08 14:49:32 +00:00
Zhang Lili
119 lines
3.4 KiB
C++
119 lines
3.4 KiB
C++
/*
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* Copyright (C) 2011-2021 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "util.h"
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#include "sethread_internal.h"
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#include "sethread_spinlock.h"
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int sgx_thread_spin_init(sgx_thread_spinlock_t *mutex)
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{
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CHECK_PARAMETER(mutex);
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mutex->m_refcount = 0;
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mutex->m_owner = SGX_THREAD_T_NULL;
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mutex->m_lock = SGX_SPINLOCK_INITIALIZER;
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return 0;
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}
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int sgx_thread_spin_destroy(sgx_thread_spinlock_t *mutex)
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{
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CHECK_PARAMETER(mutex);
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SPIN_LOCK(&mutex->m_lock);
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if (mutex->m_owner != SGX_THREAD_T_NULL) {
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SPIN_UNLOCK(&mutex->m_lock);
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return EBUSY;
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}
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mutex->m_refcount = 0;
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SPIN_UNLOCK(&mutex->m_lock);
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return 0;
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}
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int sgx_thread_spin_trylock(sgx_thread_spinlock_t *mutex)
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{
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CHECK_PARAMETER(mutex);
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sgx_thread_t self = (sgx_thread_t)get_thread_data();
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SPIN_LOCK(&mutex->m_lock);
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if (mutex->m_owner == self) {
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mutex->m_refcount++;
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SPIN_UNLOCK(&mutex->m_lock);
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return 0;
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}
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if (mutex->m_owner == SGX_THREAD_T_NULL) {
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mutex->m_owner = self;
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mutex->m_refcount++;
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SPIN_UNLOCK(&mutex->m_lock);
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return 0;
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}
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SPIN_UNLOCK(&mutex->m_lock);
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return EBUSY;
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}
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int sgx_thread_spin_unlock(sgx_thread_spinlock_t *mutex)
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{
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CHECK_PARAMETER(mutex);
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sgx_thread_t self = (sgx_thread_t)get_thread_data();
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SPIN_LOCK(&mutex->m_lock);
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/* if the mutux is not locked by anyone */
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if(mutex->m_owner == SGX_THREAD_T_NULL) {
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SPIN_UNLOCK(&mutex->m_lock);
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return EPERM;
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}
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/* if the mutex is locked by another thread */
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if (mutex->m_owner != self) {
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SPIN_UNLOCK(&mutex->m_lock);
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return EPERM;
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}
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/* the mutex is locked by current thread */
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if (--mutex->m_refcount == 0) {
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mutex->m_owner = SGX_THREAD_T_NULL;
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}
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SPIN_UNLOCK(&mutex->m_lock);
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return 0;
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}
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