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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Semaphore */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_initialize.h"
#include "tx_thread.h"
#include "tx_timer.h"
#include "tx_semaphore.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _txe_semaphore_create PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the create semaphore function */
/* call. */
/* */
/* INPUT */
/* */
/* semaphore_ptr Pointer to semaphore control block*/
/* name_ptr Pointer to semaphore name */
/* initial_count Initial semaphore count */
/* semaphore_control_block_size Size of semaphore control block */
/* */
/* OUTPUT */
/* */
/* TX_SEMAPHORE_ERROR Invalid semaphore pointer */
/* TX_CALLER_ERROR Invalid caller of this function */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* _tx_semaphore_create Actual create semaphore function */
/* _tx_thread_system_preempt_check Check for preemption */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _txe_semaphore_create(TX_SEMAPHORE *semaphore_ptr, CHAR *name_ptr, ULONG initial_count, UINT semaphore_control_block_size)
{
TX_INTERRUPT_SAVE_AREA
UINT status;
ULONG i;
TX_SEMAPHORE *next_semaphore;
#ifndef TX_TIMER_PROCESS_IN_ISR
TX_THREAD *thread_ptr;
#endif
/* Default status to success. */
status = TX_SUCCESS;
/* Check for an invalid semaphore pointer. */
if (semaphore_ptr == TX_NULL)
{
/* Semaphore pointer is invalid, return appropriate error code. */
status = TX_SEMAPHORE_ERROR;
}
/* Now check for a valid semaphore ID. */
else if (semaphore_control_block_size != (sizeof(TX_SEMAPHORE)))
{
/* Semaphore pointer is invalid, return appropriate error code. */
status = TX_SEMAPHORE_ERROR;
}
else
{
/* Disable interrupts. */
TX_DISABLE
/* Increment the preempt disable flag. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Next see if it is already in the created list. */
next_semaphore = _tx_semaphore_created_ptr;
for (i = ((ULONG) 0); i < _tx_semaphore_created_count; i++)
{
/* Determine if this semaphore matches the current semaphore in the list. */
if (semaphore_ptr == next_semaphore)
{
break;
}
else
{
/* Move to next semaphore. */
next_semaphore = next_semaphore -> tx_semaphore_created_next;
}
}
/* Disable interrupts. */
TX_DISABLE
/* Decrement the preempt disable flag. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Check for preemption. */
_tx_thread_system_preempt_check();
/* At this point, check to see if there is a duplicate semaphore. */
if (semaphore_ptr == next_semaphore)
{
/* Semaphore is already created, return appropriate error code. */
status = TX_SEMAPHORE_ERROR;
}
#ifndef TX_TIMER_PROCESS_IN_ISR
else
{
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(thread_ptr)
/* Check for invalid caller of this function. First check for a calling thread. */
if (thread_ptr == &_tx_timer_thread)
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
}
#endif
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Check for interrupt call. */
if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
{
/* Now, make sure the call is from an interrupt and not initialization. */
if (TX_THREAD_GET_SYSTEM_STATE() < TX_INITIALIZE_IN_PROGRESS)
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Call actual semaphore create function. */
status = _tx_semaphore_create(semaphore_ptr, name_ptr, initial_count);
}
/* Return completion status. */
return(status);
}
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