145 lines
7.2 KiB
C
145 lines
7.2 KiB
C
/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** ThreadX Component */
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/** */
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/** Semaphore */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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/* Include necessary system files. */
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#include "tx_api.h"
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#include "tx_trace.h"
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#include "tx_semaphore.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_semaphore_create PORTABLE C */
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/* 6.1 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function creates a counting semaphore with the initial count */
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/* specified in this call. */
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/* */
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/* INPUT */
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/* */
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/* semaphore_ptr Pointer to semaphore control block*/
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/* name_ptr Pointer to semaphore name */
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/* initial_count Initial semaphore count */
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/* */
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/* OUTPUT */
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/* */
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/* TX_SUCCESS Successful completion status */
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/* */
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/* CALLS */
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/* */
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/* None */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */
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/* 09-30-2020 Yuxin Zhou Modified comment(s), */
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/* resulting in version 6.1 */
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/* */
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/**************************************************************************/
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UINT _tx_semaphore_create(TX_SEMAPHORE *semaphore_ptr, CHAR *name_ptr, ULONG initial_count)
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{
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TX_INTERRUPT_SAVE_AREA
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TX_SEMAPHORE *next_semaphore;
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TX_SEMAPHORE *previous_semaphore;
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/* Initialize semaphore control block to all zeros. */
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TX_MEMSET(semaphore_ptr, 0, (sizeof(TX_SEMAPHORE)));
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/* Setup the basic semaphore fields. */
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semaphore_ptr -> tx_semaphore_name = name_ptr;
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semaphore_ptr -> tx_semaphore_count = initial_count;
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/* Disable interrupts to place the semaphore on the created list. */
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TX_DISABLE
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/* Setup the semaphore ID to make it valid. */
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semaphore_ptr -> tx_semaphore_id = TX_SEMAPHORE_ID;
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/* Place the semaphore on the list of created semaphores. First,
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check for an empty list. */
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if (_tx_semaphore_created_count == TX_EMPTY)
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{
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/* The created semaphore list is empty. Add semaphore to empty list. */
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_tx_semaphore_created_ptr = semaphore_ptr;
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semaphore_ptr -> tx_semaphore_created_next = semaphore_ptr;
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semaphore_ptr -> tx_semaphore_created_previous = semaphore_ptr;
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}
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else
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{
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/* This list is not NULL, add to the end of the list. */
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next_semaphore = _tx_semaphore_created_ptr;
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previous_semaphore = next_semaphore -> tx_semaphore_created_previous;
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/* Place the new semaphore in the list. */
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next_semaphore -> tx_semaphore_created_previous = semaphore_ptr;
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previous_semaphore -> tx_semaphore_created_next = semaphore_ptr;
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/* Setup this semaphore's next and previous created links. */
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semaphore_ptr -> tx_semaphore_created_previous = previous_semaphore;
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semaphore_ptr -> tx_semaphore_created_next = next_semaphore;
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}
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/* Increment the created count. */
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_tx_semaphore_created_count++;
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/* Optional semaphore create extended processing. */
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TX_SEMAPHORE_CREATE_EXTENSION(semaphore_ptr)
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/* If trace is enabled, register this object. */
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TX_TRACE_OBJECT_REGISTER(TX_TRACE_OBJECT_TYPE_SEMAPHORE, semaphore_ptr, name_ptr, initial_count, 0)
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/* If trace is enabled, insert this event into the trace buffer. */
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TX_TRACE_IN_LINE_INSERT(TX_TRACE_SEMAPHORE_CREATE, semaphore_ptr, initial_count, TX_POINTER_TO_ULONG_CONVERT(&next_semaphore), 0, TX_TRACE_SEMAPHORE_EVENTS)
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/* Log this kernel call. */
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TX_EL_SEMAPHORE_CREATE_INSERT
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/* Restore interrupts. */
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TX_RESTORE
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/* Return TX_SUCCESS. */
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return(TX_SUCCESS);
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}
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