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/*

 * 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 <fibril.h>

#include <string.h>

#include <async.h>

#ifndef THREAD_INITIAL_STACK_PAGES_NO

#define THREAD_INITIAL_STACK_PAGES_NO 1

#endif

/** 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)

{

	fibril_t *f;

	f = fibril_setup();

	__tcb_set(f->tcb);

	uarg->uspace_thread_function(uarg->uspace_thread_arg);

	/* XXX: we cannot free the userspace stack while running on it */

//	free(uarg->uspace_stack);

//	free(uarg);

	/* If there is a manager, destroy it */

	async_destroy_manager();

	fibril_teardown(f);

	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;

	int rc;

	stack = (char *) malloc(getpagesize() * THREAD_INITIAL_STACK_PAGES_NO);

	if (!stack)

		return -1;

	uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t));

	if (!uarg) {

		free(stack);

		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;

	rc = __SYSCALL4(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name,

	    (sysarg_t) str_size(name), (sysarg_t) tid);

	if (rc) {

		/*

		 * Failed to create a new thread.

		 * Free up the allocated structures.

		 */

		free(uarg);

		free(stack);

	}

	return rc;

}

/** Terminate current thread.

 *

 * @param status Exit status. Currently not used.

 */

void thread_exit(int status)

{

	__SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);

	for (;;)

		;

}

/** 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)

{

	return 0;

}

/** 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;

}

/** @}

 */