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|
/* -*- 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"
#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;
#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.
/**
* @breif 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);
/**
* Create N new threads, all of which execute <func>.
* Returns: on success a unique group id that can be used to control
* all of the threads in the same group. On failure, returns -1.
*/
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 maniputated 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 associate the newly spawned threads
* with an ACE_Task instance.
*
* @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. If <do_thread_exit> is
* non-0 then <ACE_Thread::exit> is called to exit the thread, in
* which case <status> is passed as the exit value of the thread.
* Should _not_ be called by main thread.
*/
void *exit (void *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, void **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);
// = 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);
/**
* 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
* Suspend a single thread.
* Suspend a group of threads.
* True if <t_id> is inactive (i.e., suspended), else false.
*/
int suspend_all (void);
int suspend (ACE_thread_t);
int suspend_grp (int grp_id);
int testsuspend (ACE_thread_t t_id);
// = Resume methods, which isn't supported on POSIX pthreads (will not block).
/**
* Resume all stopped threads
* Resume a single thread.
* Resume a group of threads.
* True if <t_id> is active (i.e., resumed), else false.
*/
int resume_all (void);
int resume (ACE_thread_t);
int resume_grp (int grp_id);
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.
* Cancel a single thread.
* Cancel a group of threads.
* True if <t_id> is cancelled, else false.
*/
int cancel_all (int async_cancel = 0);
int cancel (ACE_thread_t, int async_cancel = 0);
int cancel_grp (int grp_id, int async_cancel = 0);
int testcancel (ACE_thread_t t_id);
// = Set/get group ids for a particular thread id.
int set_grp (ACE_thread_t,
int grp_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 <task>. Returns
* 0 on success and -1 on failure. Note that <wait_task> will not
* wait on detached threads.
* Suspend all threads in an ACE_Task.
* Resume all threads in an ACE_Task.
* Send a signal <signum> to all threads in an <ACE_Task>.
*/
int wait_task (ACE_Task_Base *task);
int suspend_task (ACE_Task_Base *task);
int resume_task (ACE_Task_Base *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.
*/
int 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.
*/
int 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.
*/
int 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.
*/
int 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>.
*/
int 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.
*/
int 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.
*/
int thread_all_list (ACE_thread_t thread_list[],
size_t n);
// = Set/get group ids for a particular task.
int set_grp (ACE_Task_Base *task, int grp_id);
int get_grp (ACE_Task_Base *task, int &grp_id);
/// Return a count of the current number of threads active in the
/// <Thread_Manager>.
int 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:
/// 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,
int slot = -1);
/// 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);
/**
* 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_;
#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 */
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