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/*

 * Copyright (c) 2003 Altera Corporation, San Jose, California, USA.

 * All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * 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.

 *

 * ------------

 *

 * Altera does not recommend, suggest or require that this reference design

 * file be used in conjunction or combination with any other product.

 *

 * usleep.c - Microsecond delay routine

 */

#include <unistd.h>

#include "priv/alt_busy_sleep.h"

#include "os/alt_syscall.h"

/*

 * This function simply calls alt_busy_sleep() to perform the delay. This

 * function implements the delay as a calibrated "busy loop".

 *

 * ALT_USLEEP is mapped onto the usleep() system call in alt_syscall.h

 */

#if defined (__GNUC__) && __GNUC__ >= 4

int ALT_USLEEP (useconds_t us)

#else

unsigned int ALT_USLEEP (unsigned int us)

#endif

{

  return alt_busy_sleep(us);

}