/*

 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.

 * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved.

 * Copyright (c) 1996-2003 Intel Corporation. All rights reserved.

 *

 * This software is available to you under a choice of one of two

 * licenses.  You may choose to be licensed under the terms of the GNU

 * General Public License (GPL) Version 2, available from the file

 * COPYING in the main directory of this source tree, or the

 * OpenIB.org BSD license below:

 *

 *     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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 *

 */

#if HAVE_CONFIG_H

#  include <config.h>

#endif				/* HAVE_CONFIG_H */

#include <stdio.h>

#include <unistd.h>

#include <sys/sysinfo.h>

#include <complib/cl_thread.h>

/*

 * Internal function to run a new user mode thread.

 * This function is always run as a result of creation a new user mode thread.

 * Its main job is to synchronize the creation and running of the new thread.

 */

static void *__cl_thread_wrapper(void *arg)

{

	cl_thread_t *p_thread = (cl_thread_t *) arg;

	CL_ASSERT(p_thread);

	CL_ASSERT(p_thread->pfn_callback);

	p_thread->pfn_callback((void *)p_thread->context);

	return (NULL);

}

void cl_thread_construct(IN cl_thread_t * const p_thread)

{

	CL_ASSERT(p_thread);

	p_thread->osd.state = CL_UNINITIALIZED;

}

cl_status_t cl_thread_init(IN cl_thread_t * const p_thread,

			   IN cl_pfn_thread_callback_t pfn_callback,

			   IN const void *const context,

			   IN const char *const name)

{

	int ret;

	CL_ASSERT(p_thread);

	cl_thread_construct(p_thread);

	/* Initialize the thread structure */

	p_thread->pfn_callback = pfn_callback;

	p_thread->context = context;

	ret = pthread_create(&p_thread->osd.id, NULL,

			     __cl_thread_wrapper, (void *)p_thread);

	if (ret != 0)		/* pthread_create returns a "0" for success */

		return (CL_ERROR);

	p_thread->osd.state = CL_INITIALIZED;

	return (CL_SUCCESS);

}

void cl_thread_destroy(IN cl_thread_t * const p_thread)

{

	CL_ASSERT(p_thread);

	CL_ASSERT(cl_is_state_valid(p_thread->osd.state));

	if (p_thread->osd.state == CL_INITIALIZED)

		pthread_join(p_thread->osd.id, NULL);

	p_thread->osd.state = CL_UNINITIALIZED;

}

void cl_thread_suspend(IN const uint32_t pause_ms)

{

	/* Convert to micro seconds */

	usleep(pause_ms * 1000);

}

void cl_thread_stall(IN const uint32_t pause_us)

{

	/*

	 * Not quite a busy wait, but Linux is lacking in terms of high

	 * resolution time stamp information in user mode.

	 */

	usleep(pause_us);

}

int cl_proc_count(void)

{

	uint32_t ret;

	ret = get_nprocs();

	if (!ret)

		return 1;	/* Workaround for PPC where get_nprocs() returns 0 */

	return ret;

}

boolean_t cl_is_current_thread(IN const cl_thread_t * const p_thread)

{

	pthread_t current;

	CL_ASSERT(p_thread);

	CL_ASSERT(p_thread->osd.state == CL_INITIALIZED);

	current = pthread_self();

	return (pthread_equal(current, p_thread->osd.id));

}