mirror of
https://github.com/eclipse-threadx/threadx.git
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211 lines
8.4 KiB
C
211 lines
8.4 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_initialize.h"
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#include "tx_thread.h"
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#include "tx_timer.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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/* _txe_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 checks for errors in the create semaphore function */
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/* 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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/* semaphore_control_block_size Size of semaphore control block */
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/* */
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/* OUTPUT */
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/* */
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/* TX_SEMAPHORE_ERROR Invalid semaphore pointer */
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/* TX_CALLER_ERROR Invalid caller of this function */
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/* status Actual completion status */
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/* */
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/* CALLS */
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/* */
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/* _tx_semaphore_create Actual create semaphore function */
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/* _tx_thread_system_preempt_check Check for preemption */
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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 _txe_semaphore_create(TX_SEMAPHORE *semaphore_ptr, CHAR *name_ptr, ULONG initial_count, UINT semaphore_control_block_size)
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{
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TX_INTERRUPT_SAVE_AREA
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UINT status;
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ULONG i;
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TX_SEMAPHORE *next_semaphore;
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#ifndef TX_TIMER_PROCESS_IN_ISR
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TX_THREAD *thread_ptr;
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#endif
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/* Default status to success. */
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status = TX_SUCCESS;
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/* Check for an invalid semaphore pointer. */
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if (semaphore_ptr == TX_NULL)
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{
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/* Semaphore pointer is invalid, return appropriate error code. */
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status = TX_SEMAPHORE_ERROR;
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}
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/* Now check for a valid semaphore ID. */
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else if (semaphore_control_block_size != (sizeof(TX_SEMAPHORE)))
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{
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/* Semaphore pointer is invalid, return appropriate error code. */
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status = TX_SEMAPHORE_ERROR;
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}
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else
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{
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/* Disable interrupts. */
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TX_DISABLE
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/* Increment the preempt disable flag. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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/* Next see if it is already in the created list. */
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next_semaphore = _tx_semaphore_created_ptr;
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for (i = ((ULONG) 0); i < _tx_semaphore_created_count; i++)
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{
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/* Determine if this semaphore matches the current semaphore in the list. */
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if (semaphore_ptr == next_semaphore)
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{
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break;
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}
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else
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{
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/* Move to next semaphore. */
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next_semaphore = next_semaphore -> tx_semaphore_created_next;
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}
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}
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/* Disable interrupts. */
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TX_DISABLE
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/* Decrement the preempt disable flag. */
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_tx_thread_preempt_disable--;
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/* Restore interrupts. */
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TX_RESTORE
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/* Check for preemption. */
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_tx_thread_system_preempt_check();
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/* At this point, check to see if there is a duplicate semaphore. */
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if (semaphore_ptr == next_semaphore)
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{
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/* Semaphore is already created, return appropriate error code. */
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status = TX_SEMAPHORE_ERROR;
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}
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#ifndef TX_TIMER_PROCESS_IN_ISR
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else
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{
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/* Pickup thread pointer. */
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TX_THREAD_GET_CURRENT(thread_ptr)
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/* Check for invalid caller of this function. First check for a calling thread. */
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if (thread_ptr == &_tx_timer_thread)
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{
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/* Invalid caller of this function, return appropriate error code. */
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status = TX_CALLER_ERROR;
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}
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}
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#endif
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}
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/* Determine if everything is okay. */
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if (status == TX_SUCCESS)
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{
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/* Check for interrupt call. */
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if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
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{
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/* Now, make sure the call is from an interrupt and not initialization. */
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if (TX_THREAD_GET_SYSTEM_STATE() < TX_INITIALIZE_IN_PROGRESS)
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{
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/* Invalid caller of this function, return appropriate error code. */
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status = TX_CALLER_ERROR;
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}
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}
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}
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/* Determine if everything is okay. */
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if (status == TX_SUCCESS)
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{
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/* Call actual semaphore create function. */
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status = _tx_semaphore_create(semaphore_ptr, name_ptr, initial_count);
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}
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/* Return completion status. */
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return(status);
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}
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