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Diffstat (limited to 'ace/Thread_Manager.h')
| -rw-r--r-- | ace/Thread_Manager.h | 1098 |
1 files changed, 0 insertions, 1098 deletions
diff --git a/ace/Thread_Manager.h b/ace/Thread_Manager.h deleted file mode 100644 index 3b1a78a0a5d..00000000000 --- a/ace/Thread_Manager.h +++ /dev/null @@ -1,1098 +0,0 @@ -/* -*- C++ -*- */ - -//============================================================================= -/** - * @file Thread_Manager.h - * - * $Id$ - * - * @author Douglas C. Schmidt <schmidt@cs.wustl.edu> - */ -//============================================================================= - -#ifndef ACE_THREAD_MANAGER_H -#define ACE_THREAD_MANAGER_H -#include "ace/pre.h" - -#include "ace/Thread.h" -#include "ace/Thread_Adapter.h" -#include "ace/Thread_Exit.h" - -#if !defined (ACE_LACKS_PRAGMA_ONCE) -# pragma once -#endif /* ACE_LACKS_PRAGMA_ONCE */ - -#include "ace/Synch.h" -#include "ace/Unbounded_Queue.h" -#include "ace/Containers.h" -#include "ace/Free_List.h" -#include "ace/Singleton.h" -#include "ace/Log_Msg.h" - -// The following macros control how a Thread Manager manages a pool of -// Thread_Descriptor. Currently, the default behavior is not to -// preallocate any thread descriptor and never (well, almost never) -// free up any thread descriptor until the Thread Manager gets -// destructed. Which means, once your system is stable, you rarely -// need to pay the price of memory allocation. On a deterministic -// system, which means, the number of threads spawned can be -// determined before hand, you can either redefine the memory pool -// size macros to suit your need or constructed the Thread_Manager -// accordingly. That way, you don't pay the price of memory -// allocation when the system is really doing its job. OTOH, on -// system with resources constraint, you may want to lower the size of -// ACE_DEFAULT_THREAD_MANAGER_HWM to avoid unused memory hanging -// around. - -#if !defined (ACE_DEFAULT_THREAD_MANAGER_PREALLOC) -# define ACE_DEFAULT_THREAD_MANAGER_PREALLOC 0 -#endif /* ACE_DEFAULT_THREAD_MANAGER_PREALLOC */ - -#if !defined (ACE_DEFAULT_THREAD_MANAGER_LWM) -# define ACE_DEFAULT_THREAD_MANAGER_LWM 1 -#endif /* ACE_DEFAULT_THREAD_MANAGER_LWM */ - -#if !defined (ACE_DEFAULT_THREAD_MANAGER_INC) -# define ACE_DEFAULT_THREAD_MANAGER_INC 1 -#endif /* ACE_DEFAULT_THREAD_MANAGER_INC */ - -#if !defined (ACE_DEFAULT_THREAD_MANAGER_HWM) -# define ACE_DEFAULT_THREAD_MANAGER_HWM ACE_DEFAULT_FREE_LIST_HWM -// this is a big number -#endif /* ACE_DEFAULT_THREAD_MANAGER_HWM */ - -// This is the synchronization mechanism used to prevent a thread -// descriptor gets removed from the Thread_Manager before it gets -// stash into it. If you want to disable this feature (and risk of -// corrupting the freelist,) you define the lock as ACE_Null_Mutex. -// Usually, if you can be sure that your threads will run for an -// extended period of time, you can safely disable the lock. - -#if !defined (ACE_DEFAULT_THREAD_MANAGER_LOCK) -# define ACE_DEFAULT_THREAD_MANAGER_LOCK ACE_SYNCH_MUTEX -#endif /* ACE_DEFAULT_THREAD_MANAGER_LOCK */ - -// Forward declarations. -class ACE_Task_Base; -class ACE_Thread_Manager; -class ACE_Thread_Descriptor; - -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - /** - * @class ACE_At_Thread_Exit - * - * @brief Contains a method to be applied when a thread is terminated. - */ -class ACE_Export ACE_At_Thread_Exit -{ - friend class ACE_Thread_Descriptor; - friend class ACE_Thread_Manager; -public: - /// Default constructor - ACE_At_Thread_Exit (void); - - /// The destructor - virtual ~ACE_At_Thread_Exit (void); - - /// <At_Thread_Exit> has the ownership? - int is_owner (void) const; - - /// Set the ownership of the <At_Thread_Exit>. - int is_owner (int owner); - - /// This <At_Thread_Exit> was applied? - int was_applied (void) const; - - /// Set applied state of <At_Thread_Exit>. - int was_applied (int applied); - -protected: - /// The next <At_Thread_Exit> hook in the list. - ACE_At_Thread_Exit *next_; - - /// Do the apply if necessary - void do_apply (void); - - /// The apply method. - virtual void apply (void) = 0; - - /// The Thread_Descriptor where this at is registered. - ACE_Thread_Descriptor* td_; - - /// The at was applied? - int was_applied_; - - /// The at has the ownership of this? - int is_owner_; -}; - -class ACE_Export ACE_At_Thread_Exit_Func : public ACE_At_Thread_Exit -{ -public: - /// Constructor - ACE_At_Thread_Exit_Func (void *object, - ACE_CLEANUP_FUNC func, - void *param = 0); - - virtual ~ACE_At_Thread_Exit_Func (void); - -protected: - /// The object to be cleanup - void *object_; - - /// The cleanup func - ACE_CLEANUP_FUNC func_; - - /// A param if required - void *param_; - - /// The apply method - void apply (void); -}; - -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - -/** - * @class ACE_Thread_Descriptor_Base - * - * @brief Basic information for thread descriptors. These information - * gets extracted out because we need it after a thread is - * terminated. - */ -class ACE_Export ACE_Thread_Descriptor_Base : public ACE_OS_Thread_Descriptor -{ - - friend class ACE_Thread_Manager; - friend class ACE_Double_Linked_List<ACE_Thread_Descriptor_Base>; - friend class ACE_Double_Linked_List_Iterator_Base<ACE_Thread_Descriptor_Base>; - friend class ACE_Double_Linked_List_Iterator<ACE_Thread_Descriptor_Base>; - friend class ACE_Double_Linked_List<ACE_Thread_Descriptor>; - friend class ACE_Double_Linked_List_Iterator_Base<ACE_Thread_Descriptor>; - friend class ACE_Double_Linked_List_Iterator<ACE_Thread_Descriptor>; -public: - ACE_Thread_Descriptor_Base (void); - ~ACE_Thread_Descriptor_Base (void); - - // = We need the following operators to make Borland happy. - - /// Equality operator. - int operator== (const ACE_Thread_Descriptor_Base &rhs) const; - - /// Inequality operator. - int operator!= (const ACE_Thread_Descriptor_Base &rhs) const; - - /// Group ID. - int grp_id (void) const; - - /// Current state of the thread. - ACE_UINT32 state (void) const; - - /// Return the pointer to an <ACE_Task_Base> or NULL if there's no - /// <ACE_Task_Base> associated with this thread.; - ACE_Task_Base *task (void) const; - -protected: - /// Reset this base thread descriptor. - void reset (void); - - /// Unique thread ID. - ACE_thread_t thr_id_; - - /// Unique handle to thread (used by Win32 and AIX). - ACE_hthread_t thr_handle_; - - /// Group ID. - int grp_id_; - - /// Current state of the thread. - ACE_UINT32 thr_state_; - - /// Pointer to an <ACE_Task_Base> or NULL if there's no - /// <ACE_Task_Base>. - ACE_Task_Base *task_; - - /// We need these pointers to maintain the double-linked list in a - /// thread managers. - ACE_Thread_Descriptor_Base *next_; - ACE_Thread_Descriptor_Base *prev_; -}; - -/** - * @class ACE_Thread_Descriptor - * - * @brief Information for controlling threads that run under the control - * of the <Thread_Manager>. - */ -class ACE_Export ACE_Thread_Descriptor : public ACE_Thread_Descriptor_Base -{ -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - friend class ACE_At_Thread_Exit; -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - friend class ACE_Thread_Manager; - friend class ACE_Double_Linked_List<ACE_Thread_Descriptor>; - friend class ACE_Double_Linked_List_Iterator<ACE_Thread_Descriptor>; -public: - // = Initialization method. - ACE_Thread_Descriptor (void); - - // = Accessor methods. - /// Unique thread id. - ACE_thread_t self (void) const; - - /// Unique handle to thread (used by Win32 and AIX). - void self (ACE_hthread_t &); - - /// Dump the state of an object. - void dump (void) const; - -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - /** - * This cleanup function must be called only for ACE_TSS_cleanup. - * The ACE_TSS_cleanup delegate Log_Msg instance destruction when - * Log_Msg cleanup is called before terminate. - */ - void log_msg_cleanup(ACE_Log_Msg* log_msg); - - /** - * Register an At_Thread_Exit hook and the ownership is acquire by - * Thread_Descriptor, this is the usual case when the AT is dynamically - * allocated. - */ - int at_exit (ACE_At_Thread_Exit* cleanup); - - /// Register an At_Thread_Exit hook and the ownership is retained for the - /// caller. Normally used when the at_exit hook is created in stack. - int at_exit (ACE_At_Thread_Exit& cleanup); -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - - /** - * Register an object (or array) for cleanup at thread termination. - * "cleanup_hook" points to a (global, or static member) function - * that is called for the object or array when it to be destroyed. - * It may perform any necessary cleanup specific for that object or - * its class. "param" is passed as the second parameter to the - * "cleanup_hook" function; the first parameter is the object (or - * array) to be destroyed. Returns 0 on success, non-zero on - * failure: -1 if virtual memory is exhausted or 1 if the object (or - * arrayt) had already been registered. - */ - int at_exit (void *object, - ACE_CLEANUP_FUNC cleanup_hook, - void *param); - - /// Do nothing destructor to keep some compilers happy - ~ACE_Thread_Descriptor (void); - - /** - * Do nothing but to acquire the thread descriptor's lock and - * release. This will first check if the thread is registered or - * not. If it is already registered, there's no need to reacquire - * the lock again. This is used mainly to get newly spawned thread - * in synch with thread manager and prevent it from accessing its - * thread descriptor before it gets fully built. This function is - * only called from ACE_Log_Msg::thr_desc. - */ - void acquire_release (void); - - /** - * Set/get the <next_> pointer. These are required by the - * ACE_Free_List. ACE_INLINE is specified here because one version - * of g++ couldn't grok this code without it. - */ - ACE_INLINE_FOR_GNUC void set_next (ACE_Thread_Descriptor *td); - ACE_INLINE_FOR_GNUC ACE_Thread_Descriptor *get_next (void) const; - -private: - /// Reset this thread descriptor. - void reset (ACE_Thread_Manager *tm); - -#if !defined (ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - /// Pop an At_Thread_Exit from at thread termination list, apply the at - /// if apply is true. - void at_pop (int apply = 1); - - /// Push an At_Thread_Exit to at thread termination list and set the - /// ownership of at. - void at_push (ACE_At_Thread_Exit* cleanup, - int is_owner = 0); - - /// Run the AT_Thread_Exit hooks. - void do_at_exit (void); - - /// terminate realize the cleanup process to thread termination - void terminate (void); - - /// Thread_Descriptor is the ownership of ACE_Log_Msg if log_msg_!=0 - /// This can occur because ACE_TSS_cleanup was executed before terminate. - ACE_Log_Msg *log_msg_; - - /// The AT_Thread_Exit list - ACE_At_Thread_Exit *at_exit_list_; -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - - /** - * Stores the cleanup info for a thread. - * @@ Note, this should be generalized to be a stack of - * <ACE_Cleanup_Info>s. - */ - ACE_Cleanup_Info cleanup_info_; - -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - /// Pointer to an <ACE_Thread_Manager> or NULL if there's no - /// <ACE_Thread_Manager>. - ACE_Thread_Manager* tm_; -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - - /// Registration lock to prevent premature removal of thread descriptor. - ACE_DEFAULT_THREAD_MANAGER_LOCK *sync_; - -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - /// Keep track of termination status. - int terminated_; -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ -}; - -// Forward declaration. -class ACE_Thread_Control; - -// This typedef should be (and used to be) inside the -// ACE_Thread_Manager declaration. But, it caused compilation -// problems on g++/VxWorks/i960 with -g. Note that -// ACE_Thread_Manager::THR_FUNC is only used internally in -// ACE_Thread_Manager, so it's not useful for anyone else. -// It also caused problems on IRIX5 with g++. -#if defined (__GNUG__) -typedef int (ACE_Thread_Manager::*ACE_THR_MEMBER_FUNC)(ACE_Thread_Descriptor *, int); -#endif /* __GNUG__ */ - -/** - * @class ACE_Thread_Manager - * - * @brief Manages a pool of threads. - * - * This class allows operations on groups of threads atomically. - * The default behavior of thread manager is to wait on - * all threads under it's management when it gets destructed. - * Therefore, remember to remove a thread from thread manager if - * you don't want it to wait for the thread. There are also - * function to disable this default wait-on-exit behavior. - * However, if your program depends on turning this off to run - * correctly, you are probably doing something wrong. Rule of - * thumb, use ACE_Thread to manage your daemon threads. - * Notice that if there're threads live beyond the scope of - * <main>, you are sure to have resource leaks in your program. - * Remember to wait on threads before exiting <main> if that - * could happen in your programs. - */ -class ACE_Export ACE_Thread_Manager -{ -public: - friend class ACE_Thread_Control; - - // Allow ACE_THread_Exit to register the global TSS instance object. - friend class ACE_Thread_Exit; -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - friend class ACE_Thread_Descriptor; -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - -#if !defined (__GNUG__) - typedef int (ACE_Thread_Manager::*ACE_THR_MEMBER_FUNC)(ACE_Thread_Descriptor *, int); -#endif /* !__GNUG__ */ - - // These are the various states a thread managed by the - // <Thread_Manager> can be in. - enum - { - /// Uninitialized. - ACE_THR_IDLE = 0x00000000, - - /// Created but not yet running. - ACE_THR_SPAWNED = 0x00000001, - - /// Thread is active (naturally, we don't know if it's actually - /// *running* because we aren't the scheduler...). - ACE_THR_RUNNING = 0x00000002, - - /// Thread is suspended. - ACE_THR_SUSPENDED = 0x00000004, - - /// Thread has been cancelled (which is an indiction that it needs to - /// terminate...). - ACE_THR_CANCELLED = 0x00000008, - - /// Thread has shutdown, but the slot in the thread manager hasn't - /// been reclaimed yet. - ACE_THR_TERMINATED = 0x00000010, - - /// Join operation has been invoked on the thread by thread manager. - ACE_THR_JOINING = 0x10000000 - }; - - // = Initialization and termination methods. - /** - * @brief Initialization and termination methods. - * - * Internally, ACE_Thread_Manager keeps a freelist for caching - * resources it uses to keep track of managed threads (not the - * threads themselves.) @a prealloc, @a lwm, @a inc, @hwm - * determine the initial size, the low water mark, increment step, - * and high water mark of the freelist. - * - * @sa ACE_Free_List - */ - ACE_Thread_Manager (size_t preaolloc = ACE_DEFAULT_THREAD_MANAGER_PREALLOC, - size_t lwm = ACE_DEFAULT_THREAD_MANAGER_LWM, - size_t inc = ACE_DEFAULT_THREAD_MANAGER_INC, - size_t hwm = ACE_DEFAULT_THREAD_MANAGER_HWM); - virtual ~ACE_Thread_Manager (void); - -#if ! defined (ACE_THREAD_MANAGER_LACKS_STATICS) - /// Get pointer to a process-wide <ACE_Thread_Manager>. - static ACE_Thread_Manager *instance (void); - - /// Set pointer to a process-wide <ACE_Thread_Manager> and return - /// existing pointer. - static ACE_Thread_Manager *instance (ACE_Thread_Manager *); - - /// Delete the dynamically allocated Singleton - static void close_singleton (void); -#endif /* ! defined (ACE_THREAD_MANAGER_LACKS_STATICS) */ - - /// No-op. Currently unused. - int open (size_t size = 0); - - /** - * Release all resources. - * By default, this method will wait till all threads - * exit. However, when called from <close_singleton>, most global resources - * are destroyed and thus, we don't try to wait but just clean up the thread - * descriptor list. - */ - int close (void); - - // The <ACE_thread_t> * argument to each of the <spawn> family member - // functions is interpreted and used as shown in the following - // table. NOTE: the final option, to provide task names, is _only_ - // supported on VxWorks! - // - // Value of ACE_thread_t * argument Use Platforms - // ================================ ========================== ========= - // 0 Not used. All - // non-0 (and points to 0 char * The task name is passed All - // on VxWorks) back in the char *. - // non-0, points to non-0 char * The char * is used as VxWorks only - // the task name. The - // argument is not modified. - - /** - * Create a new thread, which executes <func>. - * Returns: on success a unique group id that can be used to control - * other threads added to the same group. On failure, returns -1. - */ - int spawn (ACE_THR_FUNC func, - void *args = 0, - long flags = THR_NEW_LWP | THR_JOINABLE, - ACE_thread_t * = 0, - ACE_hthread_t *t_handle = 0, - long priority = ACE_DEFAULT_THREAD_PRIORITY, - int grp_id = -1, - void *stack = 0, - size_t stack_size = 0); - - /** - * Spawn N new threads, which execute <func> with argument <arg>. - * If <thread_ids> != 0 the thread_ids of successfully spawned - * threads will be placed into the <thread_ids> buffer (which must - * be the same size as <n>). If <stack> != 0 it is assumed to be an - * array of <n> pointers to the base of the stacks to use for the - * threads being spawned. If <stack_size> != 0 it is assumed to be - * an array of <n> values indicating how big each of the - * corresponding <stack>s are. If <thread_handles> != 0 it is - * assumed to be an array of <n> thread_handles that will be - * assigned the values of the thread handles being spawned. - * - * Threads in Thread_Manager can be manipulated in groups based on - * <grp_id> or <task> using functions such as kill_grp() or - * cancel_task(). - * - * If <grp_id> is assigned, the newly spawned threads are added into - * the group. Otherwise, the Thread_Manager assigns these <n> - * threads with a grp_id. You should choose either assigning - * <grp_id> everytime, or let the Thread_Manager handles it for - * you consistently. - * - * The argument <task> is usually assigned by - * <ACE_Task_Base::activate>. It associates the newly spawned - * threads with an ACE_Task instance, which defaults to <this>. - * - * @retval -1 on failure (<errno> will explain...), otherwise returns the - * group id of the threads. - */ - int spawn_n (size_t n, - ACE_THR_FUNC func, - void *args = 0, - long flags = THR_NEW_LWP | THR_JOINABLE, - long priority = ACE_DEFAULT_THREAD_PRIORITY, - int grp_id = -1, - ACE_Task_Base *task = 0, - ACE_hthread_t thread_handles[] = 0, - void *stack[] = 0, - size_t stack_size[] = 0); - - /** - * Spawn N new threads, which execute <func> with argument <arg>. - * If <thread_ids> != 0 the thread_ids of successfully spawned - * threads will be placed into the <thread_ids> buffer (which must - * be the same size as <n>). If <stack> != 0 it is assumed to be an - * array of <n> pointers to the base of the stacks to use for the - * threads being spawned. If <stack_size> != 0 it is assumed to be - * an array of <n> values indicating how big each of the - * corresponding <stack>s are. If <thread_handles> != 0 it is - * assumed to be an array of <n> thread_handles that will be - * assigned the values of the thread handles being spawned. - * - * Threads in Thread_Manager can be manipulated in groups based on - * <grp_id> or <task> using functions such as kill_grp() or - * cancel_task(). - * - * If <grp_id> is assigned, the newly spawned threads are added into - * the group. Otherwise, the Thread_Manager assigns these <n> - * threads with a grp_id. You should choose either assigning - * <grp_id> everytime, or let the Thread_Manager handles it for - * you consistently. - * - * The argument <task> is usually assigned by - * <ACE_Task_Base::activate>. It associates the newly spawned - * threads with an ACE_Task instance, which defaults to <this>. - * - * @retval -1 on failure (<errno> will explain...), otherwise returns the - * group id of the threads. - */ - int spawn_n (ACE_thread_t thread_ids[], - size_t n, - ACE_THR_FUNC func, - void *args, - long flags, - long priority = ACE_DEFAULT_THREAD_PRIORITY, - int grp_id = -1, - void *stack[] = 0, - size_t stack_size[] = 0, - ACE_hthread_t thread_handles[] = 0, - ACE_Task_Base *task = 0); - - /** - * Called to clean up when a thread exits. - * - * @param do_thread_exit If non-0 then ACE_Thread::exit is called to - * exit the thread - * @param status If ACE_Thread_Exit is called, this is passed as - * the exit value of the thread. - * Should _not_ be called by main thread. - */ - ACE_THR_FUNC_RETURN exit (ACE_THR_FUNC_RETURN status = 0, - int do_thread_exit = 1); - - /** - * Block until there are no more threads running in the - * <Thread_Manager> or <timeout> expires. Note that <timeout> is - * treated as "absolute" time. Returns 0 on success and -1 on - * failure. If <abandon_detached_threads> is set, wait will first - * check thru its thread list for threads with THR_DETACHED or - * THR_DAEMON flags set and remove these threads. Notice that - * unlike other wait_* function, by default, <wait> does wait on - * all thread spawned by this thread_manager no matter the detached - * flags are set or not unless it is called with - * <abandon_detached_threads> flag set. - * NOTE that if this function is called while the ACE_Object_Manager - * is shutting down (as a result of program rundown via ACE::fini), - * it will not wait for any threads to complete. If you must wait for - * threads spawned by this thread manager to complete and you are in a - * ACE rundown situation (such as your object is being destroyed by the - * ACE_Object_Manager) you can use wait_grp instead. - */ - int wait (const ACE_Time_Value *timeout = 0, - int abandon_detached_threads = 0); - - /// Join a thread specified by <tid>. Do not wait on a detached thread. - int join (ACE_thread_t tid, ACE_THR_FUNC_RETURN *status = 0); - - /** - * Block until there are no more threads running in a group. - * Returns 0 on success and -1 on failure. Notice that wait_grp - * will not wait on detached threads. - */ - int wait_grp (int grp_id); - - /** - * Return the "real" handle to the calling thread, caching it if - * necessary in TSS to speed up subsequent lookups. This is - * necessary since on some platforms (e.g., Win32) we can't get this - * handle via direct method calls. Notice that you should *not* - * close the handle passed back from this method. It is used - * internally by Thread Manager. On the other hand, you *have to* - * use this internal thread handle when working on Thread_Manager. - * Return -1 if fail. - */ - int thr_self (ACE_hthread_t &); - - /** - * Return the unique ID of the thread. This is not strictly - * necessary (because a thread can always just call - * <ACE_Thread::self>). However, we put it here to be complete. - */ - ACE_thread_t thr_self (void); - - /** - * Returns a pointer to the current <ACE_Task_Base> we're executing - * in if this thread is indeed running in an <ACE_Task_Base>, else - * return 0. - */ - ACE_Task_Base *task (void); - - // = Suspend methods, which isn't supported on POSIX pthreads (will not block). - /// Suspend all threads - int suspend_all (void); - - /// Suspend a single thread. - int suspend (ACE_thread_t); - - /// Suspend a group of threads. - int suspend_grp (int grp_id); - - /** - * True if <t_id> is inactive (i.e., suspended), else false. Always - * return false if <t_id> is not managed by the Thread_Manager. - */ - int testsuspend (ACE_thread_t t_id); - - // = Resume methods, which isn't supported on POSIX pthreads (will not block). - /// Resume all stopped threads - int resume_all (void); - - /// Resume a single thread. - int resume (ACE_thread_t); - - /// Resume a group of threads. - int resume_grp (int grp_id); - - /** - * True if <t_id> is active (i.e., resumed), else false. Always - * return false if <t_id> is not managed by the Thread_Manager. - */ - int testresume (ACE_thread_t t_id); - - // = Send signals to one or more threads without blocking. - /** - * Send <signum> to all stopped threads. Not supported on platforms - * that do not have advanced signal support, such as Win32. - * Send the <signum> to a single thread. Not supported on platforms - * that do not have advanced signal support, such as Win32. - * Send <signum> to a group of threads, not supported on platforms - * that do not have advanced signal support, such as Win32. - */ - int kill_all (int signum); - int kill (ACE_thread_t, - int signum); - int kill_grp (int grp_id, - int signum); - - // = Cancel methods, which provides a cooperative thread-termination mechanism (will not block). - /** - * Cancel's all the threads. - */ - int cancel_all (int async_cancel = 0); - - /** - * Cancel a single thread. - */ - int cancel (ACE_thread_t, int async_cancel = 0); - - /** - * Cancel a group of threads. - */ - int cancel_grp (int grp_id, int async_cancel = 0); - - /** - * True if <t_id> is cancelled, else false. Always return false if - * <t_id> is not managed by the Thread_Manager. - */ - int testcancel (ACE_thread_t t_id); - - /// Set group ids for a particular thread id. - int set_grp (ACE_thread_t, - int grp_id); - - /// Get group ids for a particular thread id. - int get_grp (ACE_thread_t, - int &grp_id); - - // = The following methods are new methods which resemble current - // methods in <ACE_Thread Manager>. For example, the <apply_task> - // method resembles the <apply_thr> method, and <suspend_task> - // resembles <suspend_thr>. - - // = Operations on ACE_Tasks. - - /** - * Block until there are no more threads running in a specified task. - * This method will not wait for either detached or daemon threads; - * the threads must have been spawned with the @c THR_JOINABLE flag. - * Upon successful completion, the threads have been joined, so further - * attempts to join with any of the waited-for threads will fail. - * - * @param task The ACE_Task_Base object whose threads are to waited for. - * - * @retval 0 Success. - * @retval -1 Failure (consult errno for further information). - */ - int wait_task (ACE_Task_Base *task); - - /** - * Suspend all threads in an ACE_Task. - */ - int suspend_task (ACE_Task_Base *task); - - /** - * Resume all threads in an ACE_Task. - */ - int resume_task (ACE_Task_Base *task); - - /** - * Send a signal <signum> to all threads in an <ACE_Task>. - */ - int kill_task (ACE_Task_Base *task, - int signum); - - /** - * Cancel all threads in an <ACE_Task>. If <async_cancel> is non-0, - * then asynchronously cancel these threads if the OS platform - * supports cancellation. Otherwise, perform a "cooperative" - * cancellation. - */ - int cancel_task (ACE_Task_Base *task, int async_cancel = 0); - - // = Collect thread handles in the thread manager. Notice that - // the collected information is just a snapshot. - /// Check if the thread is managed by the thread manager. Return true if - /// the thread is found, false otherwise. - int hthread_within (ACE_hthread_t handle); - int thread_within (ACE_thread_t tid); - - /// Returns the number of <ACE_Task_Base> in a group. - int num_tasks_in_group (int grp_id); - - /// Returns the number of threads in an <ACE_Task_Base>. - int num_threads_in_task (ACE_Task_Base *task); - - /** - * Returns in <task_list> a list of up to <n> <ACE_Tasks> in a - * group. The caller must allocate the memory for <task_list>. In - * case of an error, -1 is returned. If no requested values are - * found, 0 is returned, otherwise correct number of retrieved - * values are returned. - */ - ssize_t task_list (int grp_id, - ACE_Task_Base *task_list[], - size_t n); - - /** - * Returns in <thread_list> a list of up to <n> thread ids in an - * <ACE_Task_Base>. The caller must allocate the memory for - * <thread_list>. In case of an error, -1 is returned. If no - * requested values are found, 0 is returned, otherwise correct - * number of retrieved values are returned. - */ - ssize_t thread_list (ACE_Task_Base *task, - ACE_thread_t thread_list[], - size_t n); - - /** - * Returns in <hthread_list> a list of up to <n> thread handles in - * an <ACE_Task_Base>. The caller must allocate memory for - * <hthread_list>. In case of an error, -1 is returned. If no - * requested values are found, 0 is returned, otherwise correct - * number of retrieved values are returned. - */ - ssize_t hthread_list (ACE_Task_Base *task, - ACE_hthread_t hthread_list[], - size_t n); - - /** - * Returns in <thread_list> a list of up to <n> thread ids in a - * group <grp_id>. The caller must allocate the memory for - * <thread_list>. In case of an error, -1 is returned. If no - * requested values are found, 0 is returned, otherwise correct - * number of retrieved values are returned. - */ - ssize_t thread_grp_list (int grp_id, - ACE_thread_t thread_list[], - size_t n); - - /** - * Returns in <hthread_list> a list of up to <n> thread handles in - * a group <grp_id>. The caller must allocate memory for - * <hthread_list>. - */ - ssize_t hthread_grp_list (int grp_id, - ACE_hthread_t hthread_list[], - size_t n); - - /** - * Returns in <task_list> a list of up to <n> <ACE_Tasks>. The - * caller must allocate the memory for <task_list>. In case of an - * error, -1 is returned. If no requested values are found, 0 is - * returned, otherwise correct number of retrieved values are - * returned. - */ - ssize_t task_all_list (ACE_Task_Base *task_list[], - size_t n); - - /** - * Returns in <thread_list> a list of up to <n> thread ids. The - * caller must allocate the memory for <thread_list>. In case of an - * error, -1 is returned. If no requested values are found, 0 is - * returned, otherwise correct number of retrieved values are - * returned. - */ - ssize_t thread_all_list (ACE_thread_t thread_list[], - size_t n); - - /// Set group ids for a particular task. - int set_grp (ACE_Task_Base *task, int grp_id); - - /// Get group ids for a particular task. - int get_grp (ACE_Task_Base *task, int &grp_id); - - /// Return a count of the current number of threads active in the - /// <Thread_Manager>. - size_t count_threads (void) const; - -#if !defined(ACE_USE_ONE_SHOT_AT_THREAD_EXIT) - /** - * Register an At_Thread_Exit hook and the ownership is acquire by - * Thread_Descriptor, this is the usual case when the AT is dynamically - * allocated. - */ - int at_exit (ACE_At_Thread_Exit* cleanup); - - /// Register an At_Thread_Exit hook and the ownership is retained for the - /// caller. Normally used when the at_exit hook is created in stack. - int at_exit (ACE_At_Thread_Exit& cleanup); -#endif /* !ACE_USE_ONE_SHOT_AT_THREAD_EXIT */ - - /** - * - ***** - * @deprecated This function is deprecated. Please use the previous two - * at_exit method. Notice that you should avoid mixing this method - * with the previous two at_exit methods. - ***** - * - * Register an object (or array) for cleanup at - * thread termination. "cleanup_hook" points to a (global, or - * static member) function that is called for the object or array - * when it to be destroyed. It may perform any necessary cleanup - * specific for that object or its class. "param" is passed as the - * second parameter to the "cleanup_hook" function; the first - * parameter is the object (or array) to be destroyed. - * "cleanup_hook", for example, may delete the object (or array). - * If <cleanup_hook> == 0, the <object> will _NOT_ get cleanup at - * thread exit. You can use this to cancel the previously added - * at_exit. - */ - int at_exit (void *object, - ACE_CLEANUP_FUNC cleanup_hook, - void *param); - - /// Access function to determine whether the Thread_Manager will - /// wait for its thread to exit or not when being closing down. - void wait_on_exit (int dowait); - int wait_on_exit (void); - - /// Dump the state of an object. - void dump (void); - - /// Declare the dynamic allocation hooks. - ACE_ALLOC_HOOK_DECLARE; - -protected: - // = Accessors for ACE_Thread_Descriptors. - /** - * Get a pointer to the calling thread's own thread_descriptor. - * This must be called from a spawn thread. This function will - * fetch the info from TSS. - */ - ACE_Thread_Descriptor *thread_desc_self (void); - - /// Return a pointer to the thread's Thread_Descriptor, - /// 0 if fail. - ACE_Thread_Descriptor *thread_descriptor (ACE_thread_t); - - /// Return a pointer to the thread's Thread_Descriptor, - /// 0 if fail. - ACE_Thread_Descriptor *hthread_descriptor (ACE_hthread_t); - - /// Create a new thread (must be called with locks held). - virtual int spawn_i (ACE_THR_FUNC func, - void *args, - long flags, - ACE_thread_t * = 0, - ACE_hthread_t *t_handle = 0, - long priority = ACE_DEFAULT_THREAD_PRIORITY, - int grp_id = -1, - void *stack = 0, - size_t stack_size = 0, - ACE_Task_Base *task = 0); - - /// Run the registered hooks when the thread exits. - void run_thread_exit_hooks (int i); - - /// Locate the index of the table slot occupied by <t_id>. Returns - /// -1 if <t_id> is not in the table doesn't contain <t_id>. - ACE_Thread_Descriptor *find_thread (ACE_thread_t t_id); - - /// Locate the index of the table slot occupied by <h_id>. Returns - /// -1 if <h_id> is not in the table doesn't contain <h_id>. - ACE_Thread_Descriptor *find_hthread (ACE_hthread_t h_id); - - /** - * Locate the thread descriptor address of the list occupied by - * <task>. Returns 0 if <task> is not in the table doesn't contain - * <task>. - */ - ACE_Thread_Descriptor *find_task (ACE_Task_Base *task, - size_t slot = 0); - - /// Insert a thread in the table (checks for duplicates). - int insert_thr (ACE_thread_t t_id, - ACE_hthread_t, - int grp_id = -1, - long flags = 0); - - /// Append a thread in the table (adds at the end, growing the table - /// if necessary). - int append_thr (ACE_thread_t t_id, ACE_hthread_t, - ACE_UINT32, - int grp_id, - ACE_Task_Base *task = 0, - long flags = 0, - ACE_Thread_Descriptor *td = 0); - - /// Remove thread from the table. - void remove_thr (ACE_Thread_Descriptor *td, - int close_handler); - - /// Remove all threads from the table. - void remove_thr_all (void); - - // = The following four methods implement a simple scheme for - // operating on a collection of threads atomically. - - /** - * Efficiently check whether <thread> is in a particular <state>. - * This call updates the TSS cache if possible to speed up - * subsequent searches. - */ - int check_state (ACE_UINT32 state, - ACE_thread_t thread, - int enable = 1); - - /// Apply <func> to all members of the table that match the <task> - int apply_task (ACE_Task_Base *task, - ACE_THR_MEMBER_FUNC, - int = 0); - - /// Apply <func> to all members of the table that match the <grp_id>. - int apply_grp (int grp_id, - ACE_THR_MEMBER_FUNC func, - int arg = 0); - - /// Apply <func> to all members of the table. - int apply_all (ACE_THR_MEMBER_FUNC, - int = 0); - - /// Join the thread described in <tda>. - int join_thr (ACE_Thread_Descriptor *td, - int = 0); - - /// Resume the thread described in <tda>. - int resume_thr (ACE_Thread_Descriptor *td, - int = 0); - - /// Suspend the thread described in <tda>. - int suspend_thr (ACE_Thread_Descriptor *td, - int = 0); - - /// Send signal <signum> to the thread described in <tda>. - int kill_thr (ACE_Thread_Descriptor *td, - int signum); - - /// Set the cancellation flag for the thread described in <tda>. - int cancel_thr (ACE_Thread_Descriptor *td, - int async_cancel = 0); - - /// Register a thread as terminated and put it into the <terminated_thr_list_>. - int register_as_terminated (ACE_Thread_Descriptor *td); - - /// Setting the static ACE_TSS_TYPE (ACE_Thread_Exit) *thr_exit_ pointer. - static int set_thr_exit (ACE_TSS_TYPE (ACE_Thread_Exit) *ptr); - - /** - * Keeping a list of thread descriptors within the thread manager. - * Double-linked list enables us to cache the entries in TSS - * and adding/removing thread descriptor entries without - * affecting other thread's descriptor entries. - */ - ACE_Double_Linked_List<ACE_Thread_Descriptor> thr_list_; - -#if !defined (VXWORKS) - /// Collect terminated but not yet joined thread entries. - ACE_Double_Linked_List<ACE_Thread_Descriptor_Base> terminated_thr_list_; -#endif /* VXWORKS */ - - /// Collect pointers to thread descriptors of threads to be removed later. - ACE_Unbounded_Queue<ACE_Thread_Descriptor*> thr_to_be_removed_; - - /// Keeps track of the next group id to assign. - int grp_id_; - - /// Set if we want the Thread_Manager to wait on all threads before - /// being closed, reset otherwise. - int automatic_wait_; - - // = ACE_Thread_Mutex and condition variable for synchronizing termination. -#if defined (ACE_HAS_THREADS) - /// Serialize access to the <zero_cond_>. - ACE_Thread_Mutex lock_; - - /// Keep track of when there are no more threads. - ACE_Condition_Thread_Mutex zero_cond_; -#endif /* ACE_HAS_THREADS */ - -private: - ACE_Locked_Free_List<ACE_Thread_Descriptor, ACE_SYNCH_MUTEX> thread_desc_freelist_; - -#if ! defined (ACE_THREAD_MANAGER_LACKS_STATICS) - /// Pointer to a process-wide <ACE_Thread_Manager>. - static ACE_Thread_Manager *thr_mgr_; - - /// Must delete the <thr_mgr_> if non-0. - static int delete_thr_mgr_; - - /// Global ACE_TSS (ACE_Thread_Exit) object ptr. - static ACE_TSS_TYPE (ACE_Thread_Exit) *thr_exit_; -#endif /* ! defined (ACE_THREAD_MANAGER_LACKS_STATICS) */ -}; - -#if defined (ACE_THREAD_MANAGER_LACKS_STATICS) -#define ACE_THREAD_MANAGER_SINGLETON_DEFINE \ - ACE_Singleton<ACE_Thread_Manager, ACE_SYNCH_MUTEX>; -typedef ACE_Singleton<ACE_Thread_Manager, ACE_SYNCH_MUTEX> ACE_THREAD_MANAGER_SINGLETON; -#endif /* defined (ACE_THREAD_MANAGER_LACKS_STATICS) */ - -#if defined (__ACE_INLINE__) -#include "ace/Thread_Manager.i" -#endif /* __ACE_INLINE__ */ - -#include "ace/post.h" -#endif /* ACE_THREAD_MANAGER_H */ |