mirror of
https://github.com/intel/linux-sgx
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Li, Xun
65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
/*
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* Copyright (C) 2011-2020 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 "get_thread_id.h"
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#include <stdlib.h>
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static pthread_key_t g_tid_key;
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static pthread_once_t g_key_once = PTHREAD_ONCE_INIT;
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static void create_key()
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{
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pthread_key_create(&g_tid_key, NULL);
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}
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se_thread_id_t get_thread_id()
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{
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if(pthread_once(&g_key_once, create_key) != 0)
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abort();
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// If the key is invalid, pthread_getspecific will return NULL.
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// No need to check the pthread_key_create and pthread_setspecific return value.
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se_thread_id_t tid = (se_thread_id_t)(size_t)pthread_getspecific(g_tid_key);
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if( tid == 0)
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{
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tid = se_get_threadid();
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// pthread_setspecific() shall fail if insufficient memory exists to associate the value
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// with the key or the input key value is invalid.
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// Here we don't check the return value. Then if pthread_setspecific fails in one ecall,
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// the following ecall would call the syscall gettid to retrive the tid in one thread
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// instead of returning SGX_ERROR_OUT_OF_TCS.
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pthread_setspecific(g_tid_key, (void*)(size_t)tid);
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}
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return tid;
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}
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