mirror of
https://github.com/intel/linux-sgx
synced 2026-06-08 14:49:32 +00:00
Angie Chinchilla
9441de4c38
This release is used in conjunction with the linux-sgx-driver Intial release: https://github.com/01org/linux-sgx-driver commit-id: 0e865ce5e6b297a787bcdc12d98bada8174be6d7 Intel-id: 33399 Signed-off-by: Angie Chinchilla <angie.v.chinchilla@intel.com>
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
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* Copyright (C) 2011-2016 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 "se_event.h"
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#include <linux/futex.h>
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se_handle_t se_event_init(void)
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{
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return calloc(1, sizeof(int));
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}
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void se_event_destroy(se_handle_t se_event)
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{
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if (se_event != NULL)
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free(se_event);
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}
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int se_event_wait(se_handle_t se_event)
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{
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if (se_event == NULL)
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return SE_MUTEX_INVALID;
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if (__sync_fetch_and_add((int*)se_event, -1) == 0)
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syscall(__NR_futex, se_event, FUTEX_WAIT, -1, NULL, NULL, 0);
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return SE_MUTEX_SUCCESS;
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}
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int se_event_wake(se_handle_t se_event)
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{
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if (se_event == NULL)
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return SE_MUTEX_INVALID;
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if (__sync_fetch_and_add((int*)se_event, 1) != 0)
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syscall(__NR_futex, se_event, FUTEX_WAKE, 1, NULL, NULL, 0);
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return SE_MUTEX_SUCCESS;
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}
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