utility/rtos_compatibility_layers/posix/px_sem_destroy.c


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/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** POSIX wrapper for THREADX                                             */
/**                                                                       */
/**                                                                       */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

/* Include necessary system files.  */

#include "tx_api.h"    /* Threadx API */
#include "pthread.h"  /* Posix API */
#include "px_int.h"    /* Posix helper functions */


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    sem_destroy                                         PORTABLE C      */
/*                                                           6.1.7        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    William E. Lamie, Microsoft Corporation                             */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function destroys a nameless semphore                          */
/*    Waiting threads will be rescheduled                                 */
/*    No memory will be released                                          */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    sem                           Semaphore pointer                     */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    EINVAL                        if error occurs                       */
/*    EBUSY                         if threads were waiting               */
/*    NO_ERROR                      successful                            */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    tx_semaphore_delete           deletes actual THreadx semaphore      */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    POSIX internal Code                                                 */
/*                                                                        */
/**************************************************************************/
INT sem_destroy(sem_t *sem)
 {
    INT result;

    if((sem==NULL)|| ( sem->in_use == TX_FALSE))
    {
        result = EINVAL; /* general error */

    }
    else
    {
        if(sem->sem.tx_semaphore_suspended_count > 0 ) result = EBUSY;
        else result = NO_ERROR;
        tx_semaphore_delete(&(sem->sem));
        sem->in_use = TX_FALSE;
    }


    return result;
}