/* BEGIN_ICS_COPYRIGHT5 ****************************************

Copyright (c) 2015-2017, Intel Corporation

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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

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 * ** END_ICS_COPYRIGHT5   ****************************************/

/***********************************************************************

* 

* FILE NAME

*      cs_sema.c

*

* DESCRIPTION

*      This file contains the implementation of the Counting Semaphores

*      services.

*

* DATA STRUCTURES

*

* FUNCTIONS

*      cs_sema_create

*      cs_sema_delete

*      cs_vsema

*      cs_psema

*

* DEPENDENCIES

*      cs_g.h

*

*

* HISTORY

*

* NAME      DATE        REMARKS

* MGR       03/14/02    Initial creation of file.

* MGR       03/26/02    Corrected lint errors.

* MGR       04/18/02    PR1728.  vs_psema should return VSTATUS_AGAIN

*                       error code, if thread has been killed.

* MGR       04/23/02    PR1742.  Added fix for blocking of cs_psema;

*                       cs_vsema should release lock if count goes to 1.

*

***********************************************************************/

#include "ib_types.h"

#include "ib_status.h"

#include "cs_g.h"

#include "vs_g.h"

#include "cs_log.h"

#define function __FUNCTION__

#ifdef __LINUX__

#include <semaphore.h>

#elif defined(__VXWORKS__) 

#include <drv/timer/timerDev.h>

#endif

#ifdef LOCAL_MOD_ID

#undef LOCAL_MOD_ID

#endif

#define LOCAL_MOD_ID VIEO_CS_MOD_ID

/**********************************************************************

*

* FUNCTION

*    cs_sema_create

*

* DESCRIPTION

*    Initialize a counting semaphore object for use.

*

* INPUTS

*    handle   - A pointer to a semaphore object to be filled in by

*               the routine.

*    count    - The initial value for the semaphore.

*

* OUTPUTS

*    Status_t - On success VSTATUS_OK is returned, otherwise

*    the cause of the error.

*

*

* HISTORY

*

*   NAME    DATE        REMARKS

*   MGR     03/14/02    Initial creation of function.

*

**********************************************************************/

Status_t

cs_sema_create (Sema_t *handle,

                    uint32_t count)

{

  Status_t          rc;

  IB_ENTER (function,

            (unint)handle,

            (uint32_t)count,

            (uint32_t)0U,

	    (uint32_t)0U);

  /*

  ** Validate handle

  */

  if (handle == (Sema_t *) 0)

  {

    IB_LOG_ERROR0 ("NULL handle pointer");

    IB_EXIT (function, VSTATUS_ILLPARM);

    return VSTATUS_ILLPARM;

  }

#ifdef __VXWORKS__

  handle->magic = SEMAPHORE_MAGIC;

  handle->semId = semCCreate(SEM_Q_FIFO, count);

  handle->count = count;

  if (!handle->semId)

  {

      IB_LOG_ERROR0 ("failed to allocate semaphore");

      rc = VSTATUS_ILLPARM;

      IB_EXIT(function, rc);

      return rc;

  }

#else

  // LINUX USER SEMA

  handle->magic = SEMAPHORE_MAGIC;

  if (sem_init((sem_t *)&handle->osdSema, 0, 0) != 0)

  {

      IB_LOG_ERROR0 ("failed to allocate semaphore");

      rc = VSTATUS_ILLPARM;

      IB_EXIT(function, rc);

      return rc;

  }

#endif // vxworks

  IB_EXIT (function, VSTATUS_OK);

  return VSTATUS_OK;

}

/**********************************************************************

*

* FUNCTION

*    cs_sema_delete

*

* DESCRIPTION

*    Delete a counting semaphore object.

*

* INPUTS

*    handle   - A pointer to a semaphore object filled in by the

*               cs_sema_create() call.

*

* OUTPUTS

*    Status_t - On success VSTATUS_OK is returned, otherwise

*    the cause of the error.

*

*

* HISTORY

*

*   NAME    DATE        REMARKS

*   MGR     03/14/02    Initial creation of function.

*

**********************************************************************/

Status_t

cs_sema_delete (Sema_t *handle)

{

  Status_t          rc;

  IB_ENTER (function,

            (unint)handle,

            (uint32_t)0U,

            (uint32_t)0U,

            (uint32_t)0U);

  /*

  ** Validate handle

  */

  if (handle == (Sema_t *) 0)

  {

    IB_LOG_ERROR0 ("NULL handle pointer");

    IB_EXIT (function, VSTATUS_ILLPARM);

    return VSTATUS_ILLPARM;

  }

  if (handle->magic != SEMAPHORE_MAGIC)

  {

    IB_LOG_ERRORX ("Invalid semaphore specified:", handle->magic);

    IB_EXIT (function, VSTATUS_NXIO);

    return VSTATUS_NXIO;

  }

#ifdef __VXWORKS__

  if (!handle->semId)

  {

      IB_LOG_ERROR0 ("NULL semaphore");

      rc = VSTATUS_ILLPARM;

      IB_EXIT(function, rc);

      return rc;

  }

  if (ERROR == semDelete(handle->semId))

  {

      IB_LOG_ERROR0 ("failed to delete semaphore");

      rc = VSTATUS_ILLPARM;

      IB_EXIT(function, rc);

      return rc;

  }

  handle->semId = NULL;

  handle->count = 0;

#else

  // LINUX USER SEMA

  if (sem_destroy((sem_t *)&handle->osdSema) != 0) {

      IB_LOG_ERROR0 ("failed to delete semaphore");

      rc = VSTATUS_ILLPARM;

      IB_EXIT(function, rc);

      return rc;

  }

  memset((void *)&handle->osdSema, 0, sizeof(sem_t));

#endif

  IB_LOG_INFO ("semaphore deleted", (unint)handle);

  IB_EXIT (function, VSTATUS_OK);

  return VSTATUS_OK;

}

/**********************************************************************

*

* FUNCTION

*    cs_vsema

*

* DESCRIPTION

*    Increment a semaphore (post or give operation)

*

* INPUTS

*    handle   - A pointer to a semaphore object filled in by the

*               cs_sema_create() call.

*

* OUTPUTS

*    Status_t - On success VSTATUS_OK is returned, otherwise

*    the cause of the error.

*

*

* HISTORY

*

*   NAME    DATE        REMARKS

*   MGR     03/14/02    Initial creation of function.

*   MGR     04/23/02    PR1742.  Added fix for blocking or cs_psema;

*                       cs_vsema should release lock if count goes to 1.

*

**********************************************************************/

Status_t

cs_vsema (Sema_t *handle)

{

  Status_t          rc;

  IB_ENTER (function,

            (unint)handle,

            (uint32_t)0U,

            (uint32_t)0U,

            (uint32_t)0U);

  /*

  ** Validate handle

  */

  if (handle == (Sema_t *) 0)

  {

    IB_LOG_ERROR0 ("NULL handle pointer");

    IB_EXIT (function, VSTATUS_ILLPARM);

    return VSTATUS_ILLPARM;

  }

  if (handle->magic != SEMAPHORE_MAGIC)

  {

    IB_LOG_ERRORX ("Invalid semaphore specified:", handle->magic);

    IB_EXIT (function, VSTATUS_NXIO);

    return VSTATUS_NXIO;

  }

#ifdef __VXWORKS__

  if (ERROR == semGive(handle->semId))

  {

      IB_LOG_ERROR0 ("Failed to give semaphore");

      rc = VSTATUS_NXIO;

      IB_EXIT(function, rc);

      return rc;

  }

  handle->count++;

#else

  // LINUX USER SEMA

  if (sem_post((sem_t *)&handle->osdSema) != 0) {

      IB_LOG_ERROR0 ("Failed to give/post semaphore");

      rc = VSTATUS_NXIO;

      IB_EXIT(function, rc);

      return rc;

  }

#endif

  IB_EXIT (function, VSTATUS_OK);

  return VSTATUS_OK;

}

/**********************************************************************

*

* FUNCTION

*    cs_psema

*

* DESCRIPTION

*    Decrement a semaphore (wait or take operation)

*

* INPUTS

*    handle   - A pointer to a semaphore object filled in by the

*               cs_sema_create() call.

*

* OUTPUTS

*    Status_t - On success VSTATUS_OK is returned, otherwise

*    the cause of the error.

*

*

* HISTORY

*

*   NAME    DATE        REMARKS

*   MGR     03/14/02    Initial creation of function.

*   MGR     04/18/02    PR1728.  vs_psema should return VSTATUS_AGAIN

*                       error code, if thread has been killed.

*

**********************************************************************/

Status_t

cs_psema_wait (Sema_t *handle, int timeout)

{

	Status_t          rc=VSTATUS_OK;

	IB_ENTER (function, (unint)handle, 0U, 0U, 0U);

  	/* Validate handle */

  	if (handle == (Sema_t *) 0)

  	{

    	IB_LOG_ERROR0 ("NULL handle pointer");

    	IB_EXIT (function, VSTATUS_ILLPARM);

    	return VSTATUS_ILLPARM;

  	}

  	if (handle->magic != SEMAPHORE_MAGIC)

  	{

    	IB_LOG_ERRORX ("Invalid semaphore specified:", handle->magic);

    	IB_EXIT (function, VSTATUS_NXIO);

    	return VSTATUS_NXIO;

  	}

  	if (timeout == CS_SEMA_WAIT_FOREVER) {

		return(cs_psema(handle));

  	} else {

#ifdef __VXWORKS__

  		if (ERROR == semTake(handle->semId, timeout*sysClkRateGet()))

  		{

      		IB_LOG_WARN0("Timed out trying to take semaphore");

      		rc = VSTATUS_NXIO;

  		} else {

            handle->count--;

        }

#elif defined (__LINUX__)

  		// LINUX USER SEMA

		int i=0, rc=-1;

		do {

  			rc = sem_trywait((sem_t *)&handle->osdSema);

			++i;

			(void)vs_thread_sleep(VTIMER_1S);

		} while (i

  		if (rc != 0) {

      		IB_LOG_WARN0("Timed out trying to take semaphore");

      		rc = VSTATUS_NXIO;

  		}

#endif

	}

  	IB_EXIT (function, rc);

    return rc;

}

/**********************************************************************

*

* FUNCTION

*    cs_psema

*

* DESCRIPTION

*    Decrement a semaphore (wait or take operation)

*

* INPUTS

*    handle   - A pointer to a semaphore object filled in by the

*               cs_sema_create() call.

*

* OUTPUTS

*    Status_t - On success VSTATUS_OK is returned, otherwise

*    the cause of the error.

*

*

* HISTORY

*

*   NAME    DATE        REMARKS

*   MGR     03/14/02    Initial creation of function.

*   MGR     04/18/02    PR1728.  vs_psema should return VSTATUS_AGAIN

*                       error code, if thread has been killed.

*

**********************************************************************/

Status_t

cs_psema (Sema_t *handle)

{

  Status_t          rc;

  IB_ENTER (function,

            (unint)handle,

            (uint32_t)0U,

            (uint32_t)0U,

            (uint32_t)0U);

  /*

  ** Validate handle

  */

  if (handle == (Sema_t *) 0)

  {

    IB_LOG_ERROR0 ("NULL handle pointer");

    IB_EXIT (function, VSTATUS_ILLPARM);

    return VSTATUS_ILLPARM;

  }

  if (handle->magic != SEMAPHORE_MAGIC)

  {

    IB_LOG_ERRORX ("Invalid semaphore specified:", handle->magic);

    IB_EXIT (function, VSTATUS_NXIO);

    return VSTATUS_NXIO;

  }

#ifdef __VXWORKS__

  if (ERROR == semTake(handle->semId, WAIT_FOREVER))

  {

      IB_LOG_ERROR0 ("Failed to take semaphore");

      rc = VSTATUS_NXIO;

      IB_EXIT(function, rc);

      return rc;

  }

  handle->count--;

#else

  // LINUX USER SEMA

  if (sem_wait((sem_t *)&handle->osdSema) != 0) {

      IB_LOG_ERROR0 ("Failed to take semaphore");

      rc = VSTATUS_NXIO;

      IB_EXIT(function, rc);

      return rc;

  }

#endif

  IB_EXIT (function, VSTATUS_OK);

  return VSTATUS_OK;

}

/**********************************************************************

*

* FUNCTION

*    cs_sema_getcount

*

* DESCRIPTION

*    return counting semaphore count

*

* INPUTS

*    handle   - A pointer to a semaphore object filled in by the

*               cs_sema_create() call.

*

* OUTPUTS

*    int - semaphore count

*

*

* HISTORY

*

*   NAME    DATE        REMARKS

*   JMS     02/20/07    Initial creation of function.

*

**********************************************************************/

Status_t cs_sema_getcount(Sema_t *handle, int *semCount)

{

	Status_t rc = VSTATUS_OK;

	IB_ENTER (function, (unint)handle, 0U, 0U, 0U);

  	/* Validate handle */

  	if (handle == (Sema_t *) 0) {

    	IB_LOG_ERROR0 ("NULL handle pointer");

    	rc = VSTATUS_ILLPARM;

  	} else if (handle->magic != SEMAPHORE_MAGIC) {

    	IB_LOG_ERRORX ("Invalid semaphore specified:", handle->magic);

    	rc = VSTATUS_NXIO;

  	} else {

#ifdef __VXWORKS__

        *semCount = handle->count;

#elif defined (__LINUX__)

        if ((sem_getvalue((sem_t *)&handle->osdSema, semCount)) != 0)

        {

            IB_LOG_ERROR0 ("Failed to get semaphore count");

            rc = VSTATUS_NXIO;

        }

#endif

    }

    IB_EXIT (function, rc);

    return rc;

}