/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
/* Copyright (C) 2014 OSCAR lab, Stony Brook University
This file is part of Graphene Library OS.
Graphene Library OS is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Graphene Library OS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
/*
* db_threading.c
*
* This file contain APIs to create, exit and yield a thread.
*/
#include "pal_defs.h"
#include "pal_linux_defs.h"
#include "pal.h"
#include "pal_internal.h"
#include "pal_linux.h"
#include "pal_error.h"
#include "pal_debug.h"
#include "api.h"
#include "ecall_types.h"
#include
#include
#include
#include
#include
#include
static PAL_LOCK thread_list_lock = LOCK_INIT;
static LIST_HEAD(thread_list);
struct thread_param {
int (*callback) (void *);
const void * param;
};
void pal_start_thread (void)
{
PAL_HANDLE new_thread = NULL, tmp;
_DkInternalLock(&thread_list_lock);
list_for_each_entry(tmp, &thread_list, thread.list)
if (!tmp->thread.tcs) {
new_thread = tmp;
new_thread->thread.tcs =
pal_enclave.enclave_base + GET_ENCLAVE_TLS(tcs_offset);
break;
}
_DkInternalUnlock(&thread_list_lock);
if (!new_thread)
return;
struct thread_param * thread_param =
(struct thread_param *) new_thread->thread.param;
int (*callback) (void *) = thread_param->callback;
const void * param = thread_param->param;
free(thread_param);
new_thread->thread.param = NULL;
SET_ENCLAVE_TLS(thread, new_thread);
callback((void *) param);
}
/* _DkThreadCreate for internal use. Create an internal thread
inside the current process. The arguments callback and param
specify the starting function and parameters */
int _DkThreadCreate (PAL_HANDLE * handle, int (*callback) (void *),
const void * param, int flags)
{
PAL_HANDLE new_thread = malloc(HANDLE_SIZE(thread));
SET_HANDLE_TYPE(new_thread, thread);
new_thread->thread.tcs = NULL;
INIT_LIST_HEAD(&new_thread->thread.list);
struct thread_param * thread_param = malloc(sizeof(struct thread_param));
thread_param->callback = callback;
thread_param->param = param;
new_thread->thread.param = (void *) thread_param;
_DkInternalLock(&thread_list_lock);
list_add_tail(&new_thread->thread.list, &thread_list);
_DkInternalUnlock(&thread_list_lock);
int ret = ocall_wake_thread(NULL);
if (ret < 0)
return ret;
*handle = new_thread;
return 0;
}
int _DkThreadDelayExecution (unsigned long * duration)
{
return ocall_sleep(duration);
}
/* PAL call DkThreadYieldExecution. Yield the execution
of the current thread. */
void _DkThreadYieldExecution (void)
{
ocall_sleep(NULL);
}
/* _DkThreadExit for internal use: Thread exiting */
void _DkThreadExit (void)
{
ocall_exit();
}
int _DkThreadResume (PAL_HANDLE threadHandle)
{
return ocall_wake_thread(threadHandle->thread.tcs);
}
int _DkThreadGetCurrent (PAL_HANDLE * threadHandle)
{
*threadHandle = (PAL_HANDLE) GET_ENCLAVE_TLS(thread);
return 0;
}
struct handle_ops thread_ops = {
/* nothing */
};