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Diffstat (limited to 'cpukit/score/include/rtems/score/thread.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/thread.h | 935 |
1 files changed, 0 insertions, 935 deletions
diff --git a/cpukit/score/include/rtems/score/thread.h b/cpukit/score/include/rtems/score/thread.h deleted file mode 100644 index 7e0e2722dd..0000000000 --- a/cpukit/score/include/rtems/score/thread.h +++ /dev/null @@ -1,935 +0,0 @@ -/** - * @file rtems/score/thread.h - * - * @brief Constants and Structures Related with the Thread Control Block - * - * This include file contains all constants and structures associated - * with the thread control block. - */ - -/* - * COPYRIGHT (c) 1989-2014. - * On-Line Applications Research Corporation (OAR). - * - * Copyright (c) 2014, 2016 embedded brains GmbH. - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#ifndef _RTEMS_SCORE_THREAD_H -#define _RTEMS_SCORE_THREAD_H - -#include <rtems/score/atomic.h> -#include <rtems/score/context.h> -#if defined(RTEMS_MULTIPROCESSING) -#include <rtems/score/mppkt.h> -#endif -#include <rtems/score/isrlock.h> -#include <rtems/score/object.h> -#include <rtems/score/priority.h> -#include <rtems/score/schedulernode.h> -#include <rtems/score/stack.h> -#include <rtems/score/states.h> -#include <rtems/score/threadq.h> -#include <rtems/score/timestamp.h> -#include <rtems/score/watchdog.h> - -#if defined(RTEMS_SMP) -#include <rtems/score/processormask.h> -#endif - -struct _pthread_cleanup_context; - -struct Per_CPU_Control; - -struct _Scheduler_Control; - -struct User_extensions_Iterator; - -#ifdef __cplusplus -extern "C" { -#endif - -/** - * @defgroup ScoreThread Thread Handler - * - * @ingroup Score - * - * This handler encapsulates functionality related to the management of - * threads. This includes the creation, deletion, and scheduling of threads. - * - * The following variables are maintained as part of the per cpu data - * structure. - * - * + Idle thread pointer - * + Executing thread pointer - * + Heir thread pointer - */ -/**@{*/ - -#if defined(RTEMS_POSIX_API) - #define RTEMS_SCORE_THREAD_ENABLE_EXHAUST_TIMESLICE -#endif - -/* - * With the addition of the Constant Block Scheduler (CBS), - * this feature is needed even when POSIX is disabled. - */ -#define RTEMS_SCORE_THREAD_ENABLE_SCHEDULER_CALLOUT - -#if defined(RTEMS_POSIX_API) - #define RTEMS_SCORE_THREAD_ENABLE_USER_PROVIDED_STACK_VIA_API -#endif - -#if defined(RTEMS_DEBUG) -#define RTEMS_SCORE_THREAD_ENABLE_RESOURCE_COUNT -#endif - -/* - * Only provided for backward compatiblity to not break application - * configurations. - */ -typedef void *Thread RTEMS_DEPRECATED; - -/** - * @brief Type of the numeric argument of a thread entry function with at - * least one numeric argument. - * - * This numeric argument type designates an unsigned integer type with the - * property that any valid pointer to void can be converted to this type and - * then converted back to a pointer to void. The result will compare equal to - * the original pointer. - */ -typedef CPU_Uint32ptr Thread_Entry_numeric_type; - -/** - * @brief Data for idle thread entry. - */ -typedef struct { - void *( *entry )( uintptr_t argument ); -} Thread_Entry_idle; - -/** - * @brief Data for thread entry with one numeric argument and no return value. - */ -typedef struct { - void ( *entry )( Thread_Entry_numeric_type argument ); - Thread_Entry_numeric_type argument; -} Thread_Entry_numeric; - -/** - * @brief Data for thread entry with one pointer argument and a pointer return - * value. - */ -typedef struct { - void *( *entry )( void *argument ); - void *argument; -} Thread_Entry_pointer; - -/** - * @brief Thread entry information. - */ -typedef struct { - /** - * @brief Thread entry adaptor. - * - * Calls the corresponding thread entry with the right parameters. - * - * @param executing The executing thread. - */ - void ( *adaptor )( Thread_Control *executing ); - - /** - * @brief Thread entry data used by the adaptor to call the thread entry - * function with the right parameters. - */ - union { - Thread_Entry_idle Idle; - Thread_Entry_numeric Numeric; - Thread_Entry_pointer Pointer; - } Kinds; -} Thread_Entry_information; - -/** - * The following lists the algorithms used to manage the thread cpu budget. - * - * Reset Timeslice: At each context switch, reset the time quantum. - * Exhaust Timeslice: Only reset the quantum once it is consumed. - * Callout: Execute routine when budget is consumed. - */ -typedef enum { - THREAD_CPU_BUDGET_ALGORITHM_NONE, - THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE, - #if defined(RTEMS_SCORE_THREAD_ENABLE_EXHAUST_TIMESLICE) - THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE, - #endif - #if defined(RTEMS_SCORE_THREAD_ENABLE_SCHEDULER_CALLOUT) - THREAD_CPU_BUDGET_ALGORITHM_CALLOUT - #endif -} Thread_CPU_budget_algorithms; - -/** This defines thes the entry point for the thread specific timeslice - * budget management algorithm. - */ -typedef void (*Thread_CPU_budget_algorithm_callout )( Thread_Control * ); - -/** - * The following structure contains the information which defines - * the starting state of a thread. - */ -typedef struct { - /** This field contains the thread entry information. */ - Thread_Entry_information Entry; - /*-------------- initial execution modes ----------------- */ - /** This field indicates whether the thread was preemptible when - * it started. - */ - bool is_preemptible; - /** This field indicates the CPU budget algorith. */ - Thread_CPU_budget_algorithms budget_algorithm; - /** This field is the routine to invoke when the CPU allotment is - * consumed. - */ - Thread_CPU_budget_algorithm_callout budget_callout; - /** This field is the initial ISR disable level of this thread. */ - uint32_t isr_level; - /** This field is the initial priority. */ - Priority_Control initial_priority; - #if defined(RTEMS_SCORE_THREAD_ENABLE_USER_PROVIDED_STACK_VIA_API) - /** This field indicates whether the SuperCore allocated the stack. */ - bool core_allocated_stack; - #endif - /** This field is the stack information. */ - Stack_Control Initial_stack; - #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) - /** This field is the initial FP context area address. */ - Context_Control_fp *fp_context; - #endif - /** This field is the initial stack area address. */ - void *stack; - /** The thread-local storage (TLS) area */ - void *tls_area; -} Thread_Start_information; - -#if defined(RTEMS_SMP) -/** - * @brief The thread state with respect to the scheduler. - */ -typedef enum { - /** - * @brief This thread is blocked with respect to the scheduler. - * - * This thread uses no scheduler nodes. - */ - THREAD_SCHEDULER_BLOCKED, - - /** - * @brief This thread is scheduled with respect to the scheduler. - * - * This thread executes using one of its scheduler nodes. This could be its - * own scheduler node or in case it owns resources taking part in the - * scheduler helping protocol a scheduler node of another thread. - */ - THREAD_SCHEDULER_SCHEDULED, - - /** - * @brief This thread is ready with respect to the scheduler. - * - * None of the scheduler nodes of this thread is scheduled. - */ - THREAD_SCHEDULER_READY -} Thread_Scheduler_state; -#endif - -/** - * @brief Thread scheduler control. - */ -typedef struct { -#if defined(RTEMS_SMP) - /** - * @brief Lock to protect the scheduler node change requests. - */ - ISR_lock_Control Lock; - - /** - * @brief The current scheduler state of this thread. - */ - Thread_Scheduler_state state; - - /** - * @brief The home scheduler control of this thread. - */ - const struct _Scheduler_Control *home; - - /** - * @brief The processor assigned by the current scheduler. - */ - struct Per_CPU_Control *cpu; - - /** - * @brief Scheduler nodes immediately available to the thread by its home - * scheduler instance and due to thread queue ownerships. - * - * This chain is protected by the thread wait lock. - * - * This chain is never empty. The first scheduler node on the chain is the - * scheduler node of the home scheduler instance. - */ - Chain_Control Wait_nodes; - - /** - * @brief Scheduler nodes immediately available to the schedulers for this - * thread. - * - * This chain is protected by the thread state lock. - * - * This chain is never empty. The first scheduler node on the chain is the - * scheduler node of the home scheduler instance. - */ - Chain_Control Scheduler_nodes; - - /** - * @brief Node for the Per_CPU_Control::Threads_in_need_for_help chain. - * - * This chain is protected by the Per_CPU_Control::Lock lock of the assigned - * processor. - */ - Chain_Node Help_node; - - /** - * @brief Count of nodes scheduler nodes minus one. - * - * This chain is protected by the thread state lock. - */ - size_t helping_nodes; - - /** - * @brief List of pending scheduler node requests. - * - * This list is protected by the thread scheduler lock. - */ - Scheduler_Node *requests; - - /** - * @brief The thread processor affinity set. - */ - Processor_mask Affinity; -#endif - - /** - * @brief The scheduler nodes of this thread. - * - * Each thread has a scheduler node for each scheduler instance. - */ - Scheduler_Node *nodes; -} Thread_Scheduler_control; - -/** - * @brief Union type to hold a pointer to an immutable or a mutable object. - * - * The main purpose is to enable passing of pointers to read-only send buffers - * in the message passing subsystem. This approach is somewhat fragile since - * it prevents the compiler to check if the operations on objects are valid - * with respect to the constant qualifier. An alternative would be to add a - * third pointer argument for immutable objects, but this would increase the - * structure size. - */ -typedef union { - void *mutable_object; - const void *immutable_object; -} Thread_Wait_information_Object_argument_type; - -/** - * @brief This type is able to contain several flags used to control the wait - * class and state of a thread. - * - * The mutually exclusive wait class flags are - * - @ref THREAD_WAIT_CLASS_EVENT, - * - @ref THREAD_WAIT_CLASS_SYSTEM_EVENT, and - * - @ref THREAD_WAIT_CLASS_OBJECT. - * - * The mutually exclusive wait state flags are - * - @ref THREAD_WAIT_STATE_INTEND_TO_BLOCK, - * - @ref THREAD_WAIT_STATE_BLOCKED, and - * - @ref THREAD_WAIT_STATE_READY_AGAIN. - */ -typedef unsigned int Thread_Wait_flags; - -/** - * @brief Information required to manage a thread while it is blocked. - * - * This contains the information required to manage a thread while it is - * blocked and to return information to it. - */ -typedef struct { -#if defined(RTEMS_MULTIPROCESSING) - /* - * @brief This field is the identifier of the remote object this thread is - * waiting upon. - */ - Objects_Id remote_id; -#endif - /** This field is used to return an integer while when blocked. */ - uint32_t count; - /** This field is for a pointer to a user return argument. */ - void *return_argument; - /** This field is for a pointer to a second user return argument. */ - Thread_Wait_information_Object_argument_type - return_argument_second; - /** This field contains any options in effect on this blocking operation. */ - uint32_t option; - /** This field will contain the return status from a blocking operation. - * - * @note The following assumes that all API return codes can be - * treated as an uint32_t. - */ - uint32_t return_code; - - /** - * @brief This field contains several flags used to control the wait class - * and state of a thread in case fine-grained locking is used. - */ -#if defined(RTEMS_SMP) - Atomic_Uint flags; -#else - Thread_Wait_flags flags; -#endif - -#if defined(RTEMS_SMP) - /** - * @brief Thread wait lock control block. - * - * Parts of the thread wait information are protected by the thread wait - * default lock and additionally a thread queue lock in case the thread - * is enqueued on a thread queue. - * - * The thread wait lock mechanism protects the following thread variables - * - POSIX_API_Control::Attributes, - * - Scheduler_Node::Wait, - * - Thread_Control::Wait::Lock::Pending_requests, - * - Thread_Control::Wait::queue, and - * - Thread_Control::Wait::operations. - * - * @see _Thread_Wait_acquire(), _Thread_Wait_release(), _Thread_Wait_claim(), - * _Thread_Wait_restore_default() and _Thread_Wait_tranquilize(). - */ - struct { - /** - * @brief Thread wait default lock. - */ - ISR_lock_Control Default; - - /** - * @brief The pending thread wait lock acquire or tranquilize requests in - * case the thread is enqueued on a thread queue. - */ - Chain_Control Pending_requests; - - /** - * @brief Tranquilizer gate used by _Thread_Wait_tranquilize(). - * - * This gate is closed by _Thread_Wait_claim(). In case there are no - * pending requests during a _Thread_Wait_restore_default(), then this gate - * is opened immediately, otherwise it is placed on the pending request - * chain and opened by _Thread_Wait_remove_request_locked() as the last - * gate on the chain to signal overall request completion. - */ - Thread_queue_Gate Tranquilizer; - } Lock; - - /** - * @brief Thread queue link provided for use by the thread wait lock owner to - * build a thread queue path. - */ - Thread_queue_Link Link; -#endif - - /** - * @brief The current thread queue. - * - * If this field is NULL the thread is not enqueued on a thread queue. This - * field is protected by the thread wait default lock. - * - * @see _Thread_Wait_claim(). - */ - Thread_queue_Queue *queue; - - /** - * @brief The current thread queue operations. - * - * This field is protected by the thread lock wait default lock. - * - * @see _Thread_Wait_claim(). - */ - const Thread_queue_Operations *operations; - - Thread_queue_Heads *spare_heads; -} Thread_Wait_information; - -/** - * @brief Information required to manage a thread timer. - */ -typedef struct { - ISR_LOCK_MEMBER( Lock ) - Watchdog_Header *header; - Watchdog_Control Watchdog; -} Thread_Timer_information; - -/** - * The following defines the control block used to manage - * each thread proxy. - * - * @note It is critical that proxies and threads have identical - * memory images for the shared part. - */ -typedef struct { - /** This field is the object management structure for each proxy. */ - Objects_Control Object; - - /** - * @see Thread_Control::Join_queue - */ - Thread_queue_Control Join_queue; - - /** This field is the current execution state of this proxy. */ - States_Control current_state; - - /** - * @brief The base priority of this thread in its home scheduler instance. - */ - Priority_Node Real_priority; - -#if defined(RTEMS_SCORE_THREAD_ENABLE_RESOURCE_COUNT) - /** This field is the number of mutexes currently held by this proxy. */ - uint32_t resource_count; -#endif - - /** - * @brief Scheduler related control. - */ - Thread_Scheduler_control Scheduler; - - /** This field is the blocking information for this proxy. */ - Thread_Wait_information Wait; - /** This field is the Watchdog used to manage proxy delays and timeouts. */ - Thread_Timer_information Timer; -#if defined(RTEMS_MULTIPROCESSING) - /** This field is the received response packet in an MP system. */ - MP_packet_Prefix *receive_packet; - /****************** end of common block ********************/ - - /** - * @brief Thread queue callout for _Thread_queue_Enqueue(). - */ - Thread_queue_MP_callout thread_queue_callout; - - /** - * @brief This field is used to manage the set of active proxies in the system. - */ - RBTree_Node Active; - - /** - * @brief The scheduler node providing the thread wait nodes used to enqueue - * this thread proxy on a thread queue. - */ - Scheduler_Node Scheduler_node; - - /** - * @brief Provide thread queue heads for this thread proxy. - * - * The actual size of the thread queue heads depends on the application - * configuration. Since thread proxies are never destroyed we can use the - * same storage place for the thread queue heads. - */ - Thread_queue_Heads Thread_queue_heads[ RTEMS_ZERO_LENGTH_ARRAY ]; -#endif -} Thread_Proxy_control; - -/** - * The following record defines the control block used - * to manage each thread. - * - * @note It is critical that proxies and threads have identical - * memory images for the shared part. - */ -typedef enum { - /** This value is for the Classic RTEMS API. */ - THREAD_API_RTEMS, - /** This value is for the POSIX API. */ - THREAD_API_POSIX -} Thread_APIs; - -/** This macro defines the first API which has threads. */ -#define THREAD_API_FIRST THREAD_API_RTEMS - -/** This macro defines the last API which has threads. */ -#define THREAD_API_LAST THREAD_API_POSIX - -typedef struct Thread_Action Thread_Action; - -/** - * @brief Thread action handler. - * - * The thread action handler will be called with interrupts disabled and a - * corresponding lock acquired, e.g. _Thread_State_acquire(). The handler must - * release the corresponding lock, e.g. _Thread_State_release(). So, the - * corresponding lock may be used to protect private data used by the - * particular action. - * - * Since the action is passed to the handler additional data may be accessed - * via RTEMS_CONTAINER_OF(). - * - * @param[in] the_thread The thread performing the action. - * @param[in] action The thread action. - * @param[in] lock_context The lock context to use for the lock release. - */ -typedef void ( *Thread_Action_handler )( - Thread_Control *the_thread, - Thread_Action *action, - ISR_lock_Context *lock_context -); - -/** - * @brief Thread action. - * - * Thread actions can be chained together to trigger a set of actions on - * particular events like for example a thread post-switch. Use - * _Thread_Action_initialize() to initialize this structure. - * - * Thread actions are the building block for efficient implementation of - * - Classic signals delivery, - * - POSIX signals delivery, and - * - thread life-cycle changes. - * - * @see _Thread_Add_post_switch_action() and _Thread_Run_post_switch_actions(). - */ -struct Thread_Action { - Chain_Node Node; - Thread_Action_handler handler; -}; - -/** - * @brief Per-thread information for POSIX Keys. - */ -typedef struct { - /** - * @brief Key value pairs registered for this thread. - */ - RBTree_Control Key_value_pairs; - - /** - * @brief Lock to protect the tree operations. - */ - ISR_LOCK_MEMBER( Lock ) -} Thread_Keys_information; - -/** - * @brief Control block to manage thread actions. - * - * Use _Thread_Action_control_initialize() to initialize this structure. - */ -typedef struct { - Chain_Control Chain; -} Thread_Action_control; - -/** - * @brief Thread life states. - * - * The thread life states are orthogonal to the thread states used for - * synchronization primitives and blocking operations. They reflect the state - * changes triggered with thread restart and delete requests. - * - * The individual state values must be a power of two to allow use of bit - * operations to manipulate and evaluate the thread life state. - */ -typedef enum { - THREAD_LIFE_PROTECTED = 0x1, - THREAD_LIFE_RESTARTING = 0x2, - THREAD_LIFE_TERMINATING = 0x4, - THREAD_LIFE_CHANGE_DEFERRED = 0x8, - THREAD_LIFE_DETACHED = 0x10 -} Thread_Life_state; - -/** - * @brief Thread life control. - */ -typedef struct { - /** - * @brief Thread life action used to react upon thread restart and delete - * requests. - */ - Thread_Action Action; - - /** - * @brief The current thread life state. - */ - Thread_Life_state state; - - /** - * @brief The count of pending life change requests. - */ - uint32_t pending_life_change_requests; - -#if defined(RTEMS_POSIX_API) - /** - * @brief The thread exit value. - * - * It is, - * - the value passed to pthread_exit(), or - * - PTHREAD_CANCELED in case it is cancelled via pthread_cancel(), or - * - NULL. - */ - void *exit_value; -#endif -} Thread_Life_control; - -typedef struct { - uint32_t flags; - void * control; -}Thread_Capture_control; - -/** - * This structure defines the Thread Control Block (TCB). - * - * Uses a leading underscore in the structure name to allow forward - * declarations in standard header files provided by Newlib and GCC. - * - * In case the second member changes (currently Join_queue), then the memset() - * in _Thread_Initialize() must be adjusted. - */ -struct _Thread_Control { - /** This field is the object management structure for each thread. */ - Objects_Control Object; - - /** - * @brief Thread queue for thread join operations and multi-purpose lock. - * - * The lock of this thread queue is used for various purposes. It protects - * the following fields - * - * - RTEMS_API_Control::Signal, - * - Thread_Control::budget_algorithm, - * - Thread_Control::budget_callout, - * - Thread_Control::cpu_time_budget, - * - Thread_Control::current_state, - * - Thread_Control::Post_switch_actions, - * - Thread_Control::Scheduler::control, and - * - Thread_Control::Scheduler::own_control. - * - * @see _Thread_State_acquire(). - */ - Thread_queue_Control Join_queue; - - /** This field is the current execution state of this thread. */ - States_Control current_state; - - /** - * @brief The base priority of this thread in its home scheduler instance. - */ - Priority_Node Real_priority; - -#if defined(RTEMS_SCORE_THREAD_ENABLE_RESOURCE_COUNT) - /** This field is the number of mutexes currently held by this thread. */ - uint32_t resource_count; -#endif - - /** - * @brief Scheduler related control. - */ - Thread_Scheduler_control Scheduler; - - /** This field is the blocking information for this thread. */ - Thread_Wait_information Wait; - /** This field is the Watchdog used to manage thread delays and timeouts. */ - Thread_Timer_information Timer; -#if defined(RTEMS_MULTIPROCESSING) - /** This field is the received response packet in an MP system. */ - MP_packet_Prefix *receive_packet; -#endif - /*================= end of common block =================*/ - -#if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) - /** - * @brief Potpourri lock statistics. - * - * These SMP lock statistics are used for all lock objects that lack a - * storage space for the statistics. Examples are lock objects used in - * external libraries which are independent of the actual RTEMS build - * configuration. - */ - SMP_lock_Stats Potpourri_stats; -#endif - - /** This field is true if the thread is an idle thread. */ - bool is_idle; -#if defined(RTEMS_MULTIPROCESSING) - /** This field is true if the thread is offered globally */ - bool is_global; -#endif - /** This field is true if the thread is preemptible. */ - bool is_preemptible; - /** This field is true if the thread uses the floating point unit. */ - bool is_fp; - - /** - * @brief True, if the thread was created with an inherited scheduler - * (PTHREAD_INHERIT_SCHED), and false otherwise. - */ - bool was_created_with_inherited_scheduler; - - /** This field is the length of the time quantum that this thread is - * allowed to consume. The algorithm used to manage limits on CPU usage - * is specified by budget_algorithm. - */ - uint32_t cpu_time_budget; - /** This field is the algorithm used to manage this thread's time - * quantum. The algorithm may be specified as none which case, - * no limit is in place. - */ - Thread_CPU_budget_algorithms budget_algorithm; - /** This field is the method invoked with the budgeted time is consumed. */ - Thread_CPU_budget_algorithm_callout budget_callout; - /** This field is the amount of CPU time consumed by this thread - * since it was created. - */ - Timestamp_Control cpu_time_used; - - /** This field contains information about the starting state of - * this thread. - */ - Thread_Start_information Start; - - Thread_Action_control Post_switch_actions; - - /** This field contains the context of this thread. */ - Context_Control Registers; -#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) - /** This field points to the floating point context for this thread. - * If NULL, the thread is integer only. - */ - Context_Control_fp *fp_context; -#endif - /** This field points to the newlib reentrancy structure for this thread. */ - struct _reent *libc_reent; - /** This array contains the API extension area pointers. */ - void *API_Extensions[ THREAD_API_LAST + 1 ]; - - /** - * @brief The POSIX Keys information. - */ - Thread_Keys_information Keys; - - /** - * @brief Thread life-cycle control. - * - * Control state changes triggered by thread restart and delete requests. - */ - Thread_Life_control Life; - - Thread_Capture_control Capture; - - /** - * @brief LIFO list of POSIX cleanup contexts. - */ - struct _pthread_cleanup_context *last_cleanup_context; - - /** - * @brief LIFO list of user extensions iterators. - */ - struct User_extensions_Iterator *last_user_extensions_iterator; - - /** - * @brief Variable length array of user extension pointers. - * - * The length is defined by the application via <rtems/confdefs.h>. - */ - void *extensions[ RTEMS_ZERO_LENGTH_ARRAY ]; -}; - -#if (CPU_PROVIDES_IDLE_THREAD_BODY == FALSE) -/** - * This routine is the body of the system idle thread. - * - * NOTE: This routine is actually instantiated by confdefs.h when needed. - */ -void *_Thread_Idle_body( - uintptr_t ignored -); -#endif - -typedef void (*rtems_per_thread_routine)( Thread_Control * ); - -/* Use rtems_task_iterate() instead */ -void rtems_iterate_over_all_threads( - rtems_per_thread_routine routine -) RTEMS_DEPRECATED; - -/** - * @brief Thread control add-on. - */ -typedef struct { - /** - * @brief Offset of the pointer field in Thread_Control referencing an - * application configuration dependent memory area in the thread control - * block. - */ - size_t destination_offset; - - /** - * @brief Offset relative to the thread control block begin to an application - * configuration dependent memory area. - */ - size_t source_offset; -} Thread_Control_add_on; - -/** - * @brief Thread control add-ons. - * - * The thread control block contains fields that point to application - * configuration dependent memory areas, like the scheduler information, the - * API control blocks, the user extension context table, and the Newlib - * re-entrancy support. Account for these areas in the configuration and - * avoid extra workspace allocations for these areas. - * - * This array is provided via <rtems/confdefs.h>. - * - * @see _Thread_Control_add_on_count and _Thread_Control_size. - */ -extern const Thread_Control_add_on _Thread_Control_add_ons[]; - -/** - * @brief Thread control add-on count. - * - * Count of entries in _Thread_Control_add_ons. - * - * This value is provided via <rtems/confdefs.h>. - */ -extern const size_t _Thread_Control_add_on_count; - -/** - * @brief Size of the thread control block of a particular application. - * - * This value is provided via <rtems/confdefs.h>. - * - * @see _Thread_Control_add_ons. - */ -extern const size_t _Thread_Control_size; - -/** - * @brief Maximum size of a thread name in characters (including the - * terminating '\0' character). - * - * This value is provided via <rtems/confdefs.h>. - */ -extern const size_t _Thread_Maximum_name_size; - -/**@}*/ - -#ifdef __cplusplus -} -#endif - -#endif -/* end of include file */ |