/*
* Copyright (c) 2006 Jakub Jermar
* 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup libc
* @{
*/
/** @file
*/
#include <thread.h>
#include <libc.h>
#include <stdlib.h>
#include <libarch/faddr.h>
#include <kernel/proc/uarg.h>
#include <psthread.h>
#include <string.h>
#include <async.h>
#include <stdio.h>
#ifndef THREAD_INITIAL_STACK_PAGES_NO
#define THREAD_INITIAL_STACK_PAGES_NO 1
#endif
static LIST_INITIALIZE(thread_garbage);
extern char _tdata_start;
extern char _tdata_end;
extern char _tbss_start;
extern char _tbss_end;
/** Create TLS (Thread Local Storage) data structures.
*
* The code requires, that sections .tdata and .tbss are adjacent. It may be
* changed in the future.
*
* @return Pointer to TCB.
*/
tcb_t *__make_tls(void)
{
void *data;
tcb_t *tcb;
size_t tls_size = &_tbss_end - &_tdata_start;
tcb = __alloc_tls(&data, tls_size);
/*
* Copy thread local data from the initialization image.
*/
memcpy(data
, &_tdata_start
, &_tdata_end
- &_tdata_start
); /*
* Zero out the thread local uninitialized data.
*/
memset(data
+ (&_tbss_start
- &_tdata_start
), 0, &_tbss_end
- &_tbss_start);
return tcb;
}
void __free_tls(tcb_t *tcb)
{
size_t tls_size = &_tbss_end - &_tdata_start;
__free_tls_arch(tcb, tls_size);
}
/** Main thread function.
*
* This function is called from __thread_entry() and is used
* to call the thread's implementing function and perform cleanup
* and exit when thread returns back. Do not call this function
* directly.
*
* @param uarg Pointer to userspace argument structure.
*/
void __thread_main(uspace_arg_t *uarg)
{
psthread_data_t *pt;
pt = psthread_setup();
__tcb_set(pt->tcb);
uarg->uspace_thread_function(uarg->uspace_thread_arg);
free(uarg
->uspace_stack
);
/* If there is a manager, destroy it */
async_destroy_manager();
psthread_teardown(pt);
thread_exit(0);
}
/** Create userspace thread.
*
* This function creates new userspace thread and allocates userspace
* stack and userspace argument structure for it.
*
* @param function Function implementing the thread.
* @param arg Argument to be passed to thread.
* @param name Symbolic name of the thread.
* @param tid Thread ID of the newly created thread.
*
* @return Zero on success or a code from @ref errno.h on failure.
*/
int thread_create(void (* function)(void *), void *arg, char *name, thread_id_t *tid)
{
char *stack;
uspace_arg_t *uarg;
stack
= (char *) malloc(getpagesize
() * THREAD_INITIAL_STACK_PAGES_NO
); if (!stack)
return -1;
uarg
= (uspace_arg_t
*) malloc(sizeof(uspace_arg_t
)); if (!uarg) {
return -1;
}
uarg->uspace_entry = (void *) FADDR(__thread_entry);
uarg->uspace_stack = (void *) stack;
uarg->uspace_thread_function = function;
uarg->uspace_thread_arg = arg;
uarg->uspace_uarg = uarg;
return __SYSCALL3(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name, (sysarg_t) tid);
}
/** Terminate current thread.
*
* @param status Exit status. Currently not used.
*/
void thread_exit(int status)
{
__SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);
}
/** Detach thread.
*
* Currently not implemented.
*
* @param thread TID.
*/
void thread_detach(thread_id_t thread)
{
}
/** Join thread.
*
* Currently not implemented.
*
* @param thread TID.
*
* @return Thread exit status.
*/
int thread_join(thread_id_t thread)
{
}
/** Get current thread ID.
*
* @return Current thread ID.
*/
thread_id_t thread_get_id(void)
{
thread_id_t thread_id;
(void) __SYSCALL1(SYS_THREAD_GET_ID, (sysarg_t) &thread_id);
return thread_id;
}
/** @}
*/