text: /**************************************************************************/
  /*                                                                        */
  /*       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.                      */
  /*                                                                        */
  /**************************************************************************/
  
  
  /**************************************************************************/
  /**************************************************************************/
  /**                                                                       */ 
  /** 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        */
  /*                                                                        */
  /*    posix_in_thread_context                              PORTABLE C     */
  /*                                                           6.1.7        */
  /*  AUTHOR                                                                */
  /*                                                                        */
  /*    William E. Lamie, Microsoft Corporation                             */
  /*                                                                        */
  /*  DESCRIPTION                                                           */
  /*                                                                        */
  /*    This function determines if the system is currently in "thread"     */
  /*      context, i.e. not timer routine, not ISR, not idling.             */
  /*                                                                        */
  /*  INPUT                                                                 */
  /*                                                                        */
  /*    None                                                                */
  /*                                                                        */
  /*  OUTPUT                                                                */
  /*                                                                        */
  /*    TX_TRUE | TX_FALSE                                                  */
  /*                                                                        */
  /*  CALLS                                                                 */
  /*                                                                        */
  /*    None                                                                */
  /*                                                                        */
  /*  CALLED BY                                                             */
  /*                                                                        */
  /*    posix internal code                                                 */
  /*                                                                        */
  /*  RELEASE HISTORY                                                       */
  /*                                                                        */
  /*    DATE              NAME                      DESCRIPTION             */
  /*                                                                        */
  /*  06-02-2021     William E. Lamie         Initial Version 6.1.7         */
  /*                                                                        */
  /**************************************************************************/
  ULONG  posix_in_thread_context(VOID)
  {
      /* External variables, defined within ThreadX, needed here. */
      extern    TX_THREAD *     _tx_thread_current_ptr;
      extern    ULONG           _tx_thread_system_state;
  #ifndef TX_TIMER_PROCESS_IN_ISR
      extern    TX_THREAD       _tx_timer_thread;
  #endif
      
      /*     Return TX_FALSE if any of the following are true:
           - we are in the scheduling loop (not in a thread);
           - we are in an ISR
           - we are in a timer routine
             Return TX_TRUE otherwise (we are in a thread.)
     */
  
      if (_tx_thread_system_state == TX_INITIALIZE_IN_PROGRESS)
      {
  
          /* We are calling from initialization, return TRUE.  */
          return(TX_TRUE);
      }
      else if ((!_tx_thread_current_ptr)                  /* Not in a thread */
               || (_tx_thread_system_state)               /* In an ISR       */
  #ifndef TX_TIMER_PROCESS_IN_ISR
                                                          /* Timer routine   */
               || (_tx_thread_current_ptr == &_tx_timer_thread) 
  #endif
              )
         
      {
          /* We are NOT in thread (thread) context.  */
          return (TX_FALSE);
      }
      else
      {
          /* We ARE in thread (thread) context.  */
          return (TX_TRUE);
      }
  }
  