pegasus/src/Pegasus/Common/Thread.cpp - diff

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Diff for /pegasus/src/Pegasus/Common/Thread.cpp between version 1.57 and 1.87.4.1

version 1.57, 2003/10/23 05:59:53

version 1.87.4.1, 2006/01/18 17:37:56

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//%2003////////////////////////////////////////////////////////////////////////

//%2005////////////////////////////////////////////////////////////////////////

// Company, L. P., IBM Corp., The Open Group, Tivoli Systems.

// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.

// IBM Corp.; EMC Corporation, The Open Group.

// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.

// EMC Corporation; VERITAS Software Corporation; The Open Group.

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to

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// Modified By: Rudy Schuet (rudy.schuet@compaq.com) 11/12/01

// added nsk platform support

// Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com)

// Amit K Arora, IBM (amita@in.ibm.com) for PEP#101

// Sean Keenan, Hewlett-Packard Company (sean.keenan@hp.com)

// David Dillard, VERITAS Software Corp.

// (david.dillard@veritas.com)

//%/////////////////////////////////////////////////////////////////////////////

#include "Thread.h"

#include <exception>

#include <Pegasus/Common/IPC.h>

#include <Pegasus/Common/Tracer.h>

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# include "ThreadUnix.cpp"

#elif defined(PEGASUS_OS_TYPE_NSK)

# include "ThreadNsk.cpp"

#elif defined(PEGASUS_OS_VMS)

# include "ThreadVms.cpp"

#else

# error "Unsupported platform"

#endif

PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN

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{

if( data != NULL)

{

AcceptLanguages * al = static_cast<AcceptLanguages *>(data);

AutoPtr<AcceptLanguageList> al(static_cast<AcceptLanguageList *>(data));

delete al;

}

// l10n end

Boolean Thread::_signals_blocked = false;

// l10n

PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key = -1;

#ifndef PEGASUS_OS_ZOS

PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key = PEGASUS_THREAD_KEY_TYPE(-1);

#else

PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key;

#endif

Boolean Thread::_key_initialized = false;

Boolean Thread::_key_error = false;

// for non-native implementations

void Thread::cleanup_push( void (*routine)(void *), void *parm)

#ifndef PEGASUS_THREAD_CLEANUP_NATIVE

void Thread::cleanup_push( void (*routine)(void *), void *parm) throw(IPCException)

{

cleanup_handler *cu = new cleanup_handler(routine, parm);

try

{

_cleanup.insert_first(cu);

}

catch(IPCException&)

{

delete cu;

AutoPtr<cleanup_handler> cu(new cleanup_handler(routine, parm));

throw;

_cleanup.insert_first(cu.get());

}

cu.release();

return;

}

void Thread::cleanup_pop(Boolean execute) throw(IPCException)

void Thread::cleanup_pop(Boolean execute)

{

cleanup_handler *cu ;

AutoPtr<cleanup_handler> cu;

try

{

cu = _cleanup.remove_first() ;

cu.reset(_cleanup.remove_first());

}

catch(IPCException&)

{

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}

if(execute == true)

cu->execute();

delete cu;

}

#endif

//thread_data *Thread::put_tsd(const Sint8 *key, void (*delete_func)(void *), Uint32 size, void *value) throw(IPCException)

//thread_data *Thread::put_tsd(const Sint8 *key, void (*delete_func)(void *), Uint32 size, void *value)

#ifndef PEGASUS_THREAD_EXIT_NATIVE

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PEG_METHOD_ENTER(TRC_THREAD, "Thread::setCurrent");

if (Thread::initializeKey() == 0)

{

if (pegasus_set_thread_specific(Thread::_platform_thread_key,

if (pegasus_set_thread_specific(

(void *) thrd) == 0)

Thread::_platform_thread_key, (void *) thrd) == 0)

{

Tracer::trace(TRC_THREAD, Tracer::LEVEL4,

"Successful set Thread * into thread specific storage");

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else

{

Tracer::trace(TRC_THREAD, Tracer::LEVEL4,

"ERROR: got error setting Thread * into thread specific storage");

"ERROR: error setting Thread * into thread specific storage");

}

PEG_METHOD_EXIT();

}

AcceptLanguages * Thread::getLanguages()

AcceptLanguageList * Thread::getLanguages()

{

PEG_METHOD_ENTER(TRC_THREAD, "Thread::getLanguages");

Thread * curThrd = Thread::getCurrent();

if (curThrd == NULL)

return NULL;

AcceptLanguages * acceptLangs =

AcceptLanguageList * acceptLangs =

(AcceptLanguages *)curThrd->reference_tsd("acceptLanguages");

(AcceptLanguageList *)curThrd->reference_tsd("acceptLanguages");

curThrd->dereference_tsd();

PEG_METHOD_EXIT();

return acceptLangs;

}

void Thread::setLanguages(AcceptLanguages *langs) //l10n

void Thread::setLanguages(AcceptLanguageList *langs) //l10n

{

PEG_METHOD_ENTER(TRC_THREAD, "Thread::setLanguages");

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// deletes the old tsd and creates a new one

currentThrd->put_tsd("acceptLanguages",

language_delete,

sizeof(AcceptLanguages *),

sizeof(AcceptLanguageList *),

langs);

}

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}

// l10n end

#if 0

// two special synchronization classes for ThreadPool

class timed_mutex

{

public:

timed_mutex(Mutex* mut, int msec)

:_mut(mut)

{

_mut->timed_lock(msec, pegasus_thread_self());

}

~timed_mutex(void)

{

_mut->unlock();

}

Mutex* _mut;

};

#endif

class try_mutex

{

public:

try_mutex(Mutex* mut)

:_mut(mut)

{

_mut->try_lock(pegasus_thread_self());

}

~try_mutex(void)

{

_mut->unlock();

}

Mutex* _mut;

};

DQueue<ThreadPool> ThreadPool::_pools(true);

///////////////////////////////////////////////////////////////////////////////

// ThreadPool

///////////////////////////////////////////////////////////////////////////////

void ThreadPool::kill_idle_threads(void)

ThreadPool::ThreadPool(

Sint16 initialSize,

const char* key,

Sint16 minThreads,

Sint16 maxThreads,

struct timeval& deallocateWait)

: _maxThreads(maxThreads),

_minThreads(minThreads),

_currentThreads(0),

_idleThreads(true),

_runningThreads(true),

_dying(0)

{

static struct timeval now, last = {0, 0};

_deallocateWait.tv_sec = deallocateWait.tv_sec;

_deallocateWait.tv_usec = deallocateWait.tv_usec;

pegasus_gettimeofday(&now);

if(now.tv_sec - last.tv_sec > 5)

{

_pools.lock();

ThreadPool *p = _pools.next(0);

while(p != 0)

{

try

{

p->kill_dead_threads();

}

catch(...)

{

}

p = _pools.next(p);

}

_pools.unlock();

pegasus_gettimeofday(&last);

}

ThreadPool::ThreadPool(Sint16 initial_size,

const Sint8 *key,

Sint16 min,

Sint16 max,

struct timeval & alloc_wait,

struct timeval & dealloc_wait,

struct timeval & deadlock_detect)

: _max_threads(max), _min_threads(min),

_current_threads(0),

_pool(true), _running(true),

_dead(true), _dying(0)

{

_allocate_wait.tv_sec = alloc_wait.tv_sec;

_allocate_wait.tv_usec = alloc_wait.tv_usec;

_deallocate_wait.tv_sec = dealloc_wait.tv_sec;

_deallocate_wait.tv_usec = dealloc_wait.tv_usec;

_deadlock_detect.tv_sec = deadlock_detect.tv_sec;

_deadlock_detect.tv_usec = deadlock_detect.tv_usec;

memset(_key, 0x00, 17);

if(key != 0)

strncpy(_key, key, 16);

if(_max_threads > 0 && _max_threads < initial_size)

_max_threads = initial_size;

if(_min_threads > initial_size)

_min_threads = initial_size;

int i;

for(i = 0; i < initial_size; i++)

{

_link_pool(_init_thread());

strncpy(_key, key, 16);

}

_pools.insert_last(this);

}

if ((_maxThreads > 0) && (_maxThreads < initialSize))

// Note: <<< Fri Oct 17 09:19:03 2003 mdd >>>

// the pegasus_yield() calls that preceed each th->join() are to

// give a thread on the running list a chance to reach a cancellation

// point before the join

ThreadPool::~ThreadPool(void)

{

PEG_METHOD_ENTER(TRC_THREAD, "Thread::~ThreadPool");

try

{

// Set the dying flag so all thread know the destructor has been entered

{

// ThreadPool::~ThreadPool will wait to set the _dying flag until

_maxThreads = initialSize;

// it can acquire the lock. Once this lock is acquired, the thread

// acquiring the lock must be able to assume that the value of

// _dying will not change until the lock is released.

// Once the _dying flag is set, functions (e.g., kill_dead_threads,

// and allocate_and_awaken) that manipulate the ThreadPool

// queues (_pool, _dead, and _running), should not be allowed

// to run.

Tracer::trace(TRC_THREAD, Tracer::LEVEL4,

"Attempting to aquire _monitor lock");

auto_mutex dying_lock(&(this->_monitor));

Tracer::trace(TRC_THREAD, Tracer::LEVEL4,

"Acquired _monitor lock");

_dying++;

}

// remove from the global pools list

_pools.remove(this);

// start with idle threads.

if (_minThreads > initialSize)

Thread *th = 0;

th = _pool.remove_first();

Semaphore* sleep_sem;

while(th != 0)

{

sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");

PEGASUS_ASSERT(sleep_sem != 0);

if(sleep_sem == 0)

{

th->dereference_tsd();

_minThreads = initialSize;

}

else

{

// Signal to get the thread out of the work loop.

sleep_sem->signal();

// Signal to get the thread past the end. See the comment

for (int i = 0; i < initialSize; i++)

// "wait to be awakend by the thread pool destructor"

{

// Note: the current implementation of Thread for Windows

_addToIdleThreadsQueue(_initializeThread());

// does not implement "pthread" cancelation points so this

// is needed.

sleep_sem->signal();

th->dereference_tsd();

th->cancel();

th->join();

delete th;

}

th = _pool.remove_first();

}

th = _dead.remove_first();

ThreadPool::~ThreadPool()

while(th != 0)

{

sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");

PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::~ThreadPool");

PEGASUS_ASSERT(sleep_sem != 0);

if(sleep_sem == 0)

{

th->dereference_tsd();

}

else

{

//ATTN-DME-P3-20030322: _dead queue processing in

//ThreadPool::~ThreadPool is inconsistent with the

//processing in kill_dead_threads. Is this correct?

// signal the thread's sleep semaphore

sleep_sem->signal();

th->dereference_tsd();

th->cancel();

th->join();

delete th;

}

th = _dead.remove_first();

}

try

{

th = _running.remove_first();

// Set the dying flag so all thread know the destructor has been entered

while(th != 0)

_dying++;

Tracer::trace(TRC_THREAD, Tracer::LEVEL2,

"Cleaning up %d idle threads. ", _currentThreads.get());

while (_currentThreads.get() > 0)

{

// signal the thread's sleep semaphore

Thread* thread = _idleThreads.remove_first();

if (thread != 0)

sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");

PEGASUS_ASSERT(sleep_sem != 0);

if(sleep_sem == 0 )

{

th->dereference_tsd();

_cleanupThread(thread);

_currentThreads--;

}

else

{

sleep_sem->signal();

th->dereference_tsd();

th->cancel();

pegasus_yield();

th->join();

delete th;

}

th = _running.remove_first();

}

catch(...)

{

}

// make this static to the class

PEGASUS_THREAD_RETURN PEGASUS_THREAD_CDECL ThreadPool::_loop(void *parm)

{

PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop");

Thread *myself = (Thread *)parm;

try

if(myself == 0)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

Thread* myself = (Thread *)parm;

"ThreadPool::_loop: Thread pointer is null");

PEGASUS_ASSERT(myself != 0);

PEG_METHOD_EXIT();

throw NullPointer();

}

// l10n

// Set myself into thread specific storage

// This will allow code to get its own Thread

Thread::setCurrent(myself);

ThreadPool *pool = (ThreadPool *)myself->get_parm();

if(pool == 0 )

PEGASUS_ASSERT(pool != 0);

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: ThreadPool pointer is null");

PEG_METHOD_EXIT();

throw NullPointer();

}

if(pool->_dying.value())

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: ThreadPool is dying(1)");

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

Semaphore *sleep_sem = 0;

Semaphore *blocking_sem = 0;

struct timeval* lastActivityTime = 0;

struct timeval *deadlock_timer = 0;

try

{

sleep_sem = (Semaphore *)myself->reference_tsd("sleep sem");

myself->dereference_tsd();

deadlock_timer = (struct timeval *)myself->reference_tsd("deadlock timer");

PEGASUS_ASSERT(sleep_sem != 0);

lastActivityTime =

(struct timeval *)myself->reference_tsd("last activity time");

myself->dereference_tsd();

PEGASUS_ASSERT(lastActivityTime != 0);

}

catch(...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: Failure getting sleep_sem or deadlock_timer");

"ThreadPool::_loop: Failure getting sleep_sem or "

"lastActivityTime.");

PEGASUS_ASSERT(false);

pool->_idleThreads.remove(myself);

pool->_currentThreads--;

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

return((PEGASUS_THREAD_RETURN)1);

}

if(sleep_sem == 0 || deadlock_timer == 0)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: sleep_sem or deadlock_timer are null.");

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

while(1)

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{

sleep_sem->wait();

}

catch(IPCException& )

catch (...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: failure on sleep_sem->wait().");

PEGASUS_ASSERT(false);

pool->_idleThreads.remove(myself);

pool->_currentThreads--;

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

return((PEGASUS_THREAD_RETURN)1);

}

// when we awaken we reside on the running queue, not the pool queue

// When we awaken we reside on the _runningThreads queue, not the

// _idleThreads queue.

PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *_work)(void *) = 0;

PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL* work)(void *) = 0;

void *parm = 0;

Semaphore* blocking_sem = 0;

try

{

_work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) \

work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *))

myself->reference_tsd("work func");

myself->dereference_tsd();

parm = myself->reference_tsd("work parm");

myself->dereference_tsd();

blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem");

myself->dereference_tsd();

}

catch(IPCException &)

catch (...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: Failure accessing work func, work parm, or blocking sem.");

"ThreadPool::_loop: Failure accessing work func, work parm, "

"or blocking sem.");

PEGASUS_ASSERT(false);

pool->_idleThreads.remove(myself);

pool->_currentThreads--;

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

return((PEGASUS_THREAD_RETURN)1);

}

if(_work == 0)

if (work == 0)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

Tracer::trace(TRC_THREAD, Tracer::LEVEL4,

"ThreadPool::_loop: work func is null.");

"ThreadPool::_loop: work func is 0, meaning we should exit.");

PEG_METHOD_EXIT();

break;

return((PEGASUS_THREAD_RETURN)0);

}

if(_work ==

gettimeofday(lastActivityTime, NULL);

(PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) &_undertaker)

try

{

PEG_METHOD_EXIT();

PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, "Work starting.");

_work(parm);

work(parm);

PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, "Work finished.");

}

catch (Exception & e)

gettimeofday(deadlock_timer, NULL);

if (pool->_dying.value() == 0)

{

try

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

String("Exception from work in ThreadPool::_loop: ") +

e.getMessage());

}

#if !defined(PEGASUS_OS_LSB)

catch (const exception& e)

{

_work(parm);

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

String("Exception from work in ThreadPool::_loop: ") +

e.what());

}

#endif

catch(...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: execution of _work failed.");

"Unknown exception from work in ThreadPool::_loop.");

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

// put myself back onto the available list

try

{

if(pool->_dying.value() == 0)

gettimeofday(lastActivityTime, NULL);

{

gettimeofday(deadlock_timer, NULL);

if( blocking_sem != 0 )

{

blocking_sem->signal();

}

// If we are not on _running then ~ThreadPool has removed

Boolean removed = pool->_runningThreads.remove((void *)myself);

// us and now "owns" our pointer.

PEGASUS_ASSERT(removed);

if ( pool->_running.remove((void *)myself) != 0 )

{

pool->_idleThreads.insert_first(myself);

pool->_pool.insert_first(myself);

}

else

catch (...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: Adding thread to idle pool failed.");

PEGASUS_ASSERT(false);

pool->_currentThreads--;

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

return((PEGASUS_THREAD_RETURN)1);

}

else

{

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

catch (const Exception& e)

{

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"Caught exception: \"" + e.getMessage() + "\". Exiting _loop.");

}

catch(...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_loop: Adding thread to idle pool failed.");

"Caught unrecognized exception. Exiting _loop.");

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

// TODO: Why is this needed? Why not just continue?

// wait to be awakend by the thread pool destructor

//sleep_sem->wait();

myself->test_cancel();

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

void ThreadPool::allocate_and_awaken(void *parm,

ThreadStatus ThreadPool::allocate_and_awaken(

PEGASUS_THREAD_RETURN \

void* parm,

(PEGASUS_THREAD_CDECL *work)(void *),

PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL* work)(void *),

Semaphore *blocking)

throw(IPCException)

{

PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken");

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Line 497

try

{

auto_mutex dying_lock(&(this->_monitor));

if (_dying.get())

if (_dying.value())

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::allocate_and_awaken: ThreadPool is dying(1).");

return;

return PEGASUS_THREAD_UNAVAILABLE;

}

struct timeval now;

struct timeval start;

gettimeofday(&start, NULL);

Thread *th = 0;

th = _pool.remove_first();

th = _idleThreads.remove_first();

// wait for the right interval and try again

if (th == 0)

while (th == 0)

{

// will throw an IPCException&

if ((_maxThreads == 0) ||

_check_deadlock(&start) ;

(_currentThreads.get() < Uint32(_maxThreads)))

if(_max_threads == 0 || _current_threads < _max_threads)

{

th = _init_thread();

th = _initializeThread();

continue;

}

pegasus_yield();

}

th = _pool.remove_first();

if (th == 0)

{

// ATTN-DME-P3-20031103: This trace message should not be

// be labeled TRC_DISCARDED_DATA, because it does not

// necessarily imply that a failure has occurred. However,

// this label is being used temporarily to help isolate

// the cause of client timeout problems.

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::allocate_and_awaken: Insufficient resources: "

" pool = %s, running threads = %d, idle threads = %d",

_key, _runningThreads.count(), _idleThreads.count());

return PEGASUS_THREAD_INSUFFICIENT_RESOURCES;

}

// initialize the thread data with the work function and parameters

Line 711

Line 548

th->put_tsd("blocking sem", NULL, sizeof(Semaphore *), blocking);

// put the thread on the running list

_running.insert_first(th);

_runningThreads.insert_first(th);

// signal the thread's sleep semaphore to awaken it

Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");

PEGASUS_ASSERT(sleep_sem != 0);

if(sleep_sem == 0)

{

th->dereference_tsd();

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::allocate_and_awaken: thread data is corrupted.");

PEG_METHOD_EXIT();

throw NullPointer();

}

Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken");

sleep_sem->signal();

th->dereference_tsd();

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Line 563

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::allocate_and_awaken: Operation Failed.");

PEG_METHOD_EXIT();

return;

// ATTN: Error result has not yet been defined

return PEGASUS_THREAD_SETUP_FAILURE;

}

PEG_METHOD_EXIT();

return PEGASUS_THREAD_OK;

}

// caller is responsible for only calling this routine during slack periods

// but should call it at least once per _deadlock_detect with the running q

// but should call it at least once per _deallocateWait interval.

// and at least once per _deallocate_wait for the pool q

Uint32 ThreadPool::kill_dead_threads(void)

Uint32 ThreadPool::cleanupIdleThreads()

throw(IPCException)

{

// Since the kill_dead_threads, ThreadPool or allocate_and_awaken

PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupIdleThreads");

// manipulate the threads on the ThreadPool queues, they should never

// be allowed to run at the same time.

// kill_dead_threads will "hold" the _monitor lock until it has

// completed executing. ~ThreadPool will not set the dying flag until

// it can get access to the lock.

try

Uint32 numThreadsCleanedUp = 0;

{

try_mutex dying_lock(&(this->_monitor));

if (_dying.value())

{

return 0;

}

struct timeval now;

gettimeofday(&now, NULL);

Uint32 bodies = 0;

// first go thread the dead q and clean it up as much as possible

Uint32 numIdleThreads = _idleThreads.count();

try

for (Uint32 i = 0; i < numIdleThreads; i++)

{

while(_dead.count() > 0)

// Do not dip below the minimum thread count

{

if (_currentThreads.get() <= (Uint32)_minThreads)

Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "ThreadPool:: removing and joining dead thread");

Thread *dead = _dead.remove_first();

if(dead == 0)

throw NullPointer();

dead->join();

delete dead;

}

catch(...)

{

break;

}

Thread* thread = _idleThreads.remove_last();

DQueue<Thread> * map[2] =

// If there are no more threads in the _idleThreads queue, we're done.

{

if (thread == 0)

&_pool, &_running

};

DQueue<Thread> *q = 0;

int i = 0;

AtomicInt needed(0);

#ifdef PEGASUS_DISABLE_KILLING_HUNG_THREADS

// This change prevents the thread pool from killing "hung" threads.

// The definition of a "hung" thread is one that has been on the run queue

// for longer than the time interval set when the thread pool was created.

// Cancelling "hung" threads has proven to be problematic.

// With this change the thread pool will not cancel "hung" threads. This

// may prevent a crash depending upon the state of the "hung" thread. In

// the case that the thread is actually hung, this change causes the

// thread resources not to be reclaimed.

// Idle threads, those that have not executed a routine for a time

// interval, continue to be destroyed. This is normal and should not

// cause any problems.

for( ; i < 1; i++)

#else

for( ; i < 2; i++)

#endif

{

q = map[i];

if(q->count() > 0 )

{

try

{

q->try_lock();

break;

}

catch(...)

{

return bodies;

}

struct timeval dt = { 0, 0 };

struct timeval* lastActivityTime;

struct timeval *dtp;

Thread *th = 0;

th = q->next(th);

while (th != 0 )

{

try

{

dtp = (struct timeval *)th->try_reference_tsd("deadlock timer");

lastActivityTime = (struct timeval *)thread->try_reference_tsd(

"last activity time");

PEGASUS_ASSERT(lastActivityTime != 0);

}

catch(...)

{

q->unlock();

PEGASUS_ASSERT(false);

return bodies;

_idleThreads.insert_last(thread);

break;

}

if(dtp != 0)

Boolean cleanupThisThread =

{

_timeIntervalExpired(lastActivityTime, &_deallocateWait);

memcpy(&dt, dtp, sizeof(struct timeval));

thread->dereference_tsd();

}

th->dereference_tsd();

struct timeval deadlock_timeout;

Boolean too_long;

if( i == 0)

{

too_long = check_time(&dt, get_deallocate_wait(&deadlock_timeout));

}

else

{

too_long = check_time(&dt, get_deadlock_detect(&deadlock_timeout));

}

if( true == too_long)

if (cleanupThisThread)

{

// if we are deallocating from the pool, escape if we are

// down to the minimum thread count

_current_threads--;

if( _current_threads.value() < (Uint32)_min_threads )

{

if( i == 0)

_cleanupThread(thread);

{

_currentThreads--;

_current_threads++;

numThreadsCleanedUp++;

th = q->next(th);

continue;

}

else

{

// we are killing a hung thread and we will drop below the

_idleThreads.insert_first(thread);

// minimum. create another thread to make up for the one

// we are about to kill

needed++;

}

th = q->remove_no_lock((void *)th);

PEG_METHOD_EXIT();

return numThreadsCleanedUp;

}

if(th != 0)

void ThreadPool::_cleanupThread(Thread* thread)

{

if( i == 0 )

{

th->delete_tsd("work func");

PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupThread");

th->put_tsd("work func", NULL,

// Set the "work func" and "work parm" to 0 so _loop() knows to exit.

thread->delete_tsd("work func");

thread->put_tsd(

"work func", 0,

sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),

(void *)&_undertaker);

(void *) 0);

th->delete_tsd("work parm");

thread->delete_tsd("work parm");

th->put_tsd("work parm", NULL, sizeof(void *), th);

thread->put_tsd("work parm", 0, sizeof(void *), 0);

// signal the thread's sleep semaphore to awaken it

Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");

Semaphore* sleep_sem = (Semaphore *)thread->reference_tsd("sleep sem");

PEGASUS_ASSERT(sleep_sem != 0);

if(sleep_sem == 0)

{

q->unlock();

th->dereference_tsd();

throw NullPointer();

}

bodies++;

th->dereference_tsd();

_dead.insert_first(th);

sleep_sem->signal();

th = 0;

thread->dereference_tsd();

}

else

{

// deadlocked threads

Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Killing a deadlocked thread");

th->cancel();

delete th;

}

th = q->next(th);

pegasus_yield();

}

q->unlock();

}

while (needed.value() > 0) {

thread->join();

_link_pool(_init_thread());

delete thread;

needed--;

pegasus_sleep(0);

}

return bodies;

}

catch (AlreadyLocked &)

{

// kill_dead_threads was not able to obtain the

// _monitor lock that controls access to the

// _dying flag and the ThreadPool queues.

// This means that one of the queue manipulating

// functions (e.g., ~ThreadPool or allocate_and_awaken)

// is running. Since cleanup is opportunistic, this

// function just returns.

}

return 0;

}

PEG_METHOD_EXIT();

}

Boolean ThreadPool::check_time(struct timeval *start, struct timeval *interval)

Boolean ThreadPool::_timeIntervalExpired(

struct timeval* start,

struct timeval* interval)

{

// never time out if the interval is zero

if(interval && interval->tv_sec == 0 && interval->tv_usec == 0)

if (interval && (interval->tv_sec == 0) && (interval->tv_usec == 0))

{

return false;

}

struct timeval now , finish , remaining ;

Uint32 usec;

pegasus_gettimeofday(&now);

/* remove valgrind error */

pegasus_gettimeofday(&remaining); // Avoid valgrind error

pegasus_gettimeofday(&remaining);

finish.tv_sec = start->tv_sec + interval->tv_sec;

usec = start->tv_usec + interval->tv_usec;

Line 964

Line 676

usec %= 1000000;

finish.tv_usec = usec;

if ( timeval_subtract(&remaining, &finish, &now) )

return (timeval_subtract(&remaining, &finish, &now) != 0);

return true;

else

return false;

}

PEGASUS_THREAD_RETURN ThreadPool::_undertaker( void *parm )

void ThreadPool::_deleteSemaphore(void *p)

{

exit_thread((PEGASUS_THREAD_RETURN)1);

return (PEGASUS_THREAD_RETURN)1;

}

void ThreadPool::_sleep_sem_del(void *p)

{

if(p != 0)

{

delete (Semaphore *)p;

}

void ThreadPool::_check_deadlock(struct timeval *start) throw(Deadlock)

Thread* ThreadPool::_initializeThread()

{

if (true == check_time(start, &_deadlock_detect))

PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_initializeThread");

throw Deadlock(pegasus_thread_self());

return;

}

Boolean ThreadPool::_check_deadlock_no_throw(struct timeval *start)

{

return(check_time(start, &_deadlock_detect));

}

Boolean ThreadPool::_check_dealloc(struct timeval *start)

{

return(check_time(start, &_deallocate_wait));

}

Thread *ThreadPool::_init_thread(void) throw(IPCException)

{

Thread *th = (Thread *) new Thread(_loop, this, false);

// allocate a sleep semaphore and pass it in the thread context

// initial count is zero, loop function will sleep until

// we signal the semaphore

Semaphore *sleep_sem = (Semaphore *) new Semaphore(0);

th->put_tsd("sleep sem", &_sleep_sem_del, sizeof(Semaphore), (void *)sleep_sem);

th->put_tsd(

"sleep sem", &_deleteSemaphore, sizeof(Semaphore), (void *)sleep_sem);

struct timeval *dldt = (struct timeval *) ::operator new(sizeof(struct timeval));

struct timeval* lastActivityTime =

pegasus_gettimeofday(dldt);

(struct timeval *) ::operator new(sizeof(struct timeval));

pegasus_gettimeofday(lastActivityTime);

th->put_tsd("deadlock timer", thread_data::default_delete, sizeof(struct timeval), (void *)dldt);

th->put_tsd("last activity time", thread_data::default_delete,

// thread will enter _loop(void *) and sleep on sleep_sem until we signal it

sizeof(struct timeval), (void *)lastActivityTime);

// thread will enter _loop() and sleep on sleep_sem until we signal it

th->run();

if (th->run() != PEGASUS_THREAD_OK)

_current_threads++;

{

Tracer::trace(TRC_THREAD, Tracer::LEVEL2,

"Could not create thread. Error code is %d.", errno);

delete th;

return 0;

}

_currentThreads++;

pegasus_yield();

PEG_METHOD_EXIT();

return th;

}

void ThreadPool::_link_pool(Thread *th) throw(IPCException)

void ThreadPool::_addToIdleThreadsQueue(Thread* th)

{

if(th == 0)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_link_pool: Thread pointer is null.");

"ThreadPool::_addToIdleThreadsQueue: Thread pointer is null.");

throw NullPointer();

}

try

{

_pool.insert_first(th);

_idleThreads.insert_first(th);

}

catch(...)

{

Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"ThreadPool::_link_pool: _pool.insert_first failed.");

"ThreadPool::_addToIdleThreadsQueue: _idleThreads.insert_first "

"failed.");

}

PEGASUS_NAMESPACE_END

Legend:

Removed from v.1.57
changed lines
	Added in v.1.87.4.1

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