diff options
Diffstat (limited to 'common/src/txe_semaphore_get.c')
| -rw-r--r-- | common/src/txe_semaphore_get.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/common/src/txe_semaphore_get.c b/common/src/txe_semaphore_get.c new file mode 100644 index 00000000..10f37e59 --- /dev/null +++ b/common/src/txe_semaphore_get.c @@ -0,0 +1,148 @@ +/**************************************************************************/ +/* */ +/* 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_thread.h" +#include "tx_timer.h" +#include "tx_semaphore.h" + + +/**************************************************************************/ +/* */ +/* FUNCTION RELEASE */ +/* */ +/* _txe_semaphore_get PORTABLE C */ +/* 6.0 */ +/* AUTHOR */ +/* */ +/* William E. Lamie, Microsoft Corporation */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function checks for errors in the semaphore get function call. */ +/* */ +/* INPUT */ +/* */ +/* semaphore_ptr Pointer to semaphore control block*/ +/* wait_option Suspension option */ +/* */ +/* OUTPUT */ +/* */ +/* TX_SEMAPHORE_ERROR Invalid semaphore pointer */ +/* TX_WAIT_ERROR Invalid wait option */ +/* status Actual completion status */ +/* */ +/* CALLS */ +/* */ +/* _tx_semaphore_get Actual get semaphore function */ +/* */ +/* CALLED BY */ +/* */ +/* Application Code */ +/* */ +/* RELEASE HISTORY */ +/* */ +/* DATE NAME DESCRIPTION */ +/* */ +/* 05-19-2020 William E. Lamie Initial Version 6.0 */ +/* */ +/**************************************************************************/ +UINT _txe_semaphore_get(TX_SEMAPHORE *semaphore_ptr, ULONG wait_option) +{ + +UINT status; + +#ifndef TX_TIMER_PROCESS_IN_ISR +TX_THREAD *current_thread; +#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 invalid semaphore ID. */ + else if (semaphore_ptr -> tx_semaphore_id != TX_SEMAPHORE_ID) + { + + /* Semaphore pointer is invalid, return appropriate error code. */ + status = TX_SEMAPHORE_ERROR; + } + else + { + + /* Check for a wait option error. Only threads are allowed any form of + suspension. */ + if (wait_option != TX_NO_WAIT) + { + + /* Is the call from an ISR or Initialization? */ + if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0)) + { + + /* A non-thread is trying to suspend, return appropriate error code. */ + status = TX_WAIT_ERROR; + } + +#ifndef TX_TIMER_PROCESS_IN_ISR + else + { + + /* Pickup thread pointer. */ + TX_THREAD_GET_CURRENT(current_thread) + + /* Is the current thread the timer thread? */ + if (current_thread == &_tx_timer_thread) + { + + /* A non-thread is trying to suspend, return appropriate error code. */ + status = TX_WAIT_ERROR; + } + } +#endif + } + } + + /* Determine if everything is okay. */ + if (status == TX_SUCCESS) + { + + /* Call actual get semaphore function. */ + status = _tx_semaphore_get(semaphore_ptr, wait_option); + } + + /* Return completion status. */ + return(status); +} + |