/* ********************************************************************************************************* * uC/OS-II * The Real-Time Kernel * * Copyright 1992-2021 Silicon Laboratories Inc. www.silabs.com * * SPDX-License-Identifier: APACHE-2.0 * * This software is subject to an open source license and is distributed by * Silicon Laboratories Inc. pursuant to the terms of the Apache License, * Version 2.0 available at www.apache.org/licenses/LICENSE-2.0. * ********************************************************************************************************* */ /* ********************************************************************************************************* * * THREAD LOCAL STORAGE (TLS) MANAGEMENT * Cross Core Embedded Studio (CCES) IMPLEMENTATION * * Filename : os_tls.c * Version : V2.93.01 ********************************************************************************************************* */ #define MICRIUM_SOURCE #include #ifdef VSC_INCLUDE_SOURCE_FILE_NAMES const char *os_tls__c = "$Id: $"; #endif #if OS_TASK_CREATE_EXT_EN > 0u #if defined(OS_TLS_TBL_SIZE) && (OS_TLS_TBL_SIZE > 0u) /* ************************************************************************************************************************ * LOCAL VARIABLES ************************************************************************************************************************ */ static OS_TLS_ID OS_TLS_NextAvailID; /* Next available TLS ID */ static OS_TLS_DESTRUCT_PTR OS_TLS_DestructPtrTbl[OS_TLS_TBL_SIZE]; /* ************************************************************************************************************************ * ALLOCATE THE NEXT AVAILABLE TLS ID * * Description: This function is called to obtain the ID of the next free TLS (Task Local Storage) register 'id' * * Arguments : perr is a pointer to a variable that will hold an error code related to this call. * * OS_ERR_NONE if the call was successful * OS_ERR_TLS_NO_MORE_AVAIL if you are attempting to assign more TLS than you declared * available through OS_TLS_TBL_SIZE. * * Returns : The next available TLS 'id' or OS_TLS_TBL_SIZE if an error is detected. ************************************************************************************************************************ */ OS_TLS_ID OS_TLS_GetID (INT8U *perr) { OS_TLS_ID id; #if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr = 0u; #endif #ifdef OS_SAFETY_CRITICAL if (perr == (INT8U *)0) { OS_SAFETY_CRITICAL_EXCEPTION(); return ((OS_TLS_ID)OS_TLS_TBL_SIZE); } #endif OS_ENTER_CRITICAL(); if (OS_TLS_NextAvailID >= OS_TLS_TBL_SIZE) { /* See if we exceeded the number of IDs available */ *perr = OS_ERR_TLS_NO_MORE_AVAIL; /* Yes, cannot allocate more TLS */ OS_EXIT_CRITICAL(); return ((OS_TLS_ID)OS_TLS_TBL_SIZE); } id = OS_TLS_NextAvailID; OS_TLS_NextAvailID++; OS_EXIT_CRITICAL(); *perr = OS_ERR_NONE; return (id); } /* ************************************************************************************************************************ * GET THE CURRENT VALUE OF A TLS REGISTER * * Description: This function is called to obtain the current value of a TLS register * * Arguments : ptcb is a pointer to the OS_TCB of the task you want to read the TLS register from. If 'ptcb' is * a NULL pointer then you will get the TLS register of the current task. * * id is the 'id' of the desired TLS register. Note that the 'id' must be less than * 'OS_TLS_NextAvailID' * * perr is a pointer to a variable that will hold an error code related to this call. * * OS_ERR_NONE if the call was successful * OS_ERR_OS_NOT_RUNNING if the kernel has not started yet * OS_ERR_TLS_ID_INVALID if the 'id' is greater or equal to OS_TLS_NextAvailID * OS_ERR_TLS_NOT_EN if the task was created by specifying that TLS support was not * needed for the task * * Returns : The current value of the task's TLS register or 0 if an error is detected. * * Note(s) : 1) ptcb->OSTCBOpt contains options passed to OSTaskCreateExt(). One of these options (OS_OPT_TASK_NO_TLS) * is used to specify that the user doesn't want TLS support for the task being created. In other words, * by default, TLS support is enabled if OS_TLS_TBL_SIZE is defined and > 0 so the user must * specifically indicate that he/she doesn't want TLS supported for a task. ************************************************************************************************************************ */ OS_TLS OS_TLS_GetValue (OS_TCB *ptcb, OS_TLS_ID id, INT8U *perr) { OS_TLS value; #if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr = 0u; #endif #ifdef OS_SAFETY_CRITICAL if (perr == (INT8U *)0) { OS_SAFETY_CRITICAL_EXCEPTION(); return ((OS_TLS)0); } #endif #if OS_ARG_CHK_EN > 0u if (id >= OS_TLS_NextAvailID) { /* Caller must specify an ID that's been assigned */ *perr = OS_ERR_TLS_ID_INVALID; return ((OS_TLS)0); } #endif OS_ENTER_CRITICAL(); if (ptcb == (OS_TCB *)0) { /* Does caller want to use current task's TCB? */ ptcb = OSTCBCur; /* Yes */ if (OSTCBCur == (OS_TCB *)0) { /* Is the kernel running? */ OS_EXIT_CRITICAL(); /* No, then caller cannot specify NULL */ *perr = OS_ERR_OS_NOT_RUNNING; return ((OS_TLS)0); } } if ((ptcb->OSTCBOpt & OS_TASK_OPT_NO_TLS) == OS_TASK_OPT_NONE) {/* See if TLS is available for this task */ value = ptcb->OSTCBTLSTbl[id]; /* Yes */ OS_EXIT_CRITICAL(); *perr = OS_ERR_NONE; return ((OS_TLS)value); } else { OS_EXIT_CRITICAL(); /* No */ *perr = OS_ERR_TLS_NOT_EN; return ((OS_TLS)0); } } /* ************************************************************************************************************************ * DEFINE TLS DESTRUCTOR FUNCTION * * Description: This function is called by the user to assign a 'destructor' function to a specific TLS. When a task is * deleted, all the destructors are called for all the task's TLS for which there is a destructor function * defined. In other when a task is deleted, all the non-NULL functions present in OS_TLS_DestructPtrTbl[] * will be called. * * Arguments : id is the ID of the TLS destructor to set * * pdestruct is a pointer to a function that is associated with a specific TLS register and is called when * a task is deleted. The prototype of such functions is: * * void MyDestructFunction (OS_TCB *ptcb, * OS_TLS_ID id, * OS_TLS value); * * you can specify a NULL pointer if you don't want to have a fucntion associated with a TLS * register. A NULL pointer (i.e. no function associated with a TLS register) is the default * value placed in OS_TLS_DestructPtrTbl[]. * * perr is a pointer to an error return code. The possible values are: * * OS_ERR_NONE The call was successful. * OS_ERR_TLS_ID_INVALID You you specified an invalid TLS ID * OS_ERR_TLS_DESTRUCT_ASSIGNED If a destructor has already been assigned to the TLS ID * * Returns : none * * Note : none ************************************************************************************************************************ */ void OS_TLS_SetDestruct (OS_TLS_ID id, OS_TLS_DESTRUCT_PTR pdestruct, INT8U *perr) { #if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr = 0u; #endif #ifdef OS_SAFETY_CRITICAL if (perr == (INT8U *)0) { OS_SAFETY_CRITICAL_EXCEPTION(); return; } #endif if (id >= OS_TLS_NextAvailID) { /* See if we exceeded the number of TLS IDs available */ *perr = OS_ERR_TLS_ID_INVALID; return; } if (OS_TLS_DestructPtrTbl[id] != (OS_TLS_DESTRUCT_PTR)0) { /* Can only assign a destructor once */ *perr = OS_ERR_TLS_DESTRUCT_ASSIGNED; return; } OS_ENTER_CRITICAL(); OS_TLS_DestructPtrTbl[id] = pdestruct; OS_EXIT_CRITICAL(); *perr = OS_ERR_NONE; } /* ************************************************************************************************************************ * SET THE CURRENT VALUE OF A TASK TLS REGISTER * * Description: This function is called to change the current value of a task TLS register. * * Arguments : ptcb is a pointer to the OS_TCB of the task you want to set the task's TLS register for. If 'ptcb' * is a NULL pointer then you will change the TLS register of the current task. * * id is the 'id' of the desired task TLS register. Note that the 'id' must be less than * 'OS_TLS_NextAvailID' * * value is the desired value for the task TLS register. * * perr is a pointer to a variable that will hold an error code related to this call. * * OS_ERR_NONE if the call was successful * OS_ERR_OS_NOT_RUNNING if the kernel has not started yet * OS_ERR_TLS_ID_INVALID if you specified an invalid TLS ID * OS_ERR_TLS_NOT_EN if the task was created by specifying that TLS support was not * needed for the task * * Returns : none * * Note(s) : 1) ptcb->OSTCBOpt contains options passed to OSTaskCreateExt(). One of these options (OS_TASK_OPT_NO_TLS) is * used to specify that the user doesn't want TLS support for the task being created. In other words, * by default, TLS support is enabled if OS_TLS_TBL_SIZE is defined and > 0 so the user must * specifically indicate that he/she doesn't want TLS supported for a task. ************************************************************************************************************************ */ void OS_TLS_SetValue (OS_TCB *ptcb, OS_TLS_ID id, OS_TLS value, INT8U *perr) { #if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr = 0u; #endif #ifdef OS_SAFETY_CRITICAL if (perr == (INT8U *)0) { OS_SAFETY_CRITICAL_EXCEPTION(); return; } #endif #if OS_ARG_CHK_EN > 0u if (id >= OS_TLS_NextAvailID) { /* Caller must specify an ID that's been assigned */ *perr = OS_ERR_TLS_ID_INVALID; return; } #endif OS_ENTER_CRITICAL(); /* Does caller want to use current task's TCB? */ if (ptcb == (OS_TCB *)0) { /* Yes */ ptcb = OSTCBCur; /* Is the kernel running? */ if (OSTCBCur == (OS_TCB *)0) { /* No, then caller cannot specify NULL */ OS_EXIT_CRITICAL(); *perr = OS_ERR_OS_NOT_RUNNING; return; } } if ((ptcb->OSTCBOpt & OS_TASK_OPT_NO_TLS) == OS_TASK_OPT_NONE) { /* See if TLS is available for this task */ ptcb->OSTCBTLSTbl[id] = value; /* Yes */ OS_EXIT_CRITICAL(); *perr = OS_ERR_NONE; } else { OS_EXIT_CRITICAL(); /* No */ *perr = OS_ERR_TLS_NOT_EN; } } /* ************************************************************************************************************************ ************************************************************************************************************************ * uC/OS-III INTERNAL FUNCTIONS * DO NOT CALL FROM THE APPLICATION CODE ************************************************************************************************************************ ************************************************************************************************************************ */ /* ************************************************************************************************************************ * INITIALIZE THE TASK LOCAL STORAGE SERVICES * * Description: This function is called by uC/OS-III to initialize the TLS id allocator. * * This function also initializes an array containing function pointers. There is one function associated * to each task TLS register and all the functions (assuming non-NULL) will be called when the task is * deleted. * * Arguments : perr is a pointer to an error return value. Current error can be: * * OS_ERR_NONE if the call was successful * * Returns : none * * Note : This function is INTERNAL to uC/OS-III and your application should not call it. ************************************************************************************************************************ */ void OS_TLS_Init (INT8U *perr) { OS_TLS_ID i; OS_TLS_NextAvailID = 0u; for (i = 0u; i < OS_TLS_TBL_SIZE; i++) { OS_TLS_DestructPtrTbl[i] = (OS_TLS_DESTRUCT_PTR)0; } *perr = OS_ERR_NONE; } /* ************************************************************************************************************************ * TASK CREATE HOOK * * Description: This function is called by OSTaskCreateExt() * * Arguments : ptcb is a pointer to the OS_TCB of the task being created. * * Returns : none * * Note(s) : 1) This function is INTERNAL to uC/OS-III and your application should not call it. * * 2) OSTaskCreateExt() clears all entries in ptcb->OSTCBTLSTbl[] before calling OS_TLS_TaskCreate() so no * need to this here. ************************************************************************************************************************ */ void OS_TLS_TaskCreate (OS_TCB *ptcb) { (void)&ptcb; } /* ************************************************************************************************************************ * TASK DELETE HOOK * * Description: This function is called by OSTaskDel() * * Arguments : ptcb is a pointer to the OS_TCB of the task being deleted. * * Returns : none * * Note(s) : 1) This function is INTERNAL to uC/OS-III and your application should not call it. ************************************************************************************************************************ */ void OS_TLS_TaskDel (OS_TCB *ptcb) { OS_TLS_ID id; OS_TLS_DESTRUCT_PTR *p_tbl; for (id = 0; id < OS_TLS_NextAvailID; id++) { /* Call all the destructors associated with the TLS IDs */ p_tbl = &OS_TLS_DestructPtrTbl[id]; if (*p_tbl != (OS_TLS_DESTRUCT_PTR)0) { (*p_tbl)(ptcb, id, ptcb->OSTCBTLSTbl[id]); } } } /* ************************************************************************************************************************ * TASK SWITCH HOOK * * Description: This function is called by OSSched() and OSIntExit() just prior to calling the context switch code * * Arguments : none * * Returns : none * * Note(s) : 1) This function is INTERNAL to uC/OS-III and your application should not call it. * * 2) It's assumed that OSTCBCur points to the task being switched out and OSTCBHighRdyPtr points to the * task being switched in. ************************************************************************************************************************ */ void OS_TLS_TaskSw (void) { } #endif #endif