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

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Diff for /pegasus/src/Pegasus/Common/Thread.cpp between version 1.44 and 1.90.2.8

version 1.44, 2003/09/25 12:01:22

version 1.90.2.8, 2006/07/29 01:13:49

Line 1

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

//%2006////////////////////////////////////////////////////////////////////////

// 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.

// EMC Corporation; Symantec 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

Line 25

Line 33

// 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 <Pegasus/Common/IPC.h>

#include <exception>

#include <Pegasus/Common/Tracer.h>

#include "Time.h"

PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN

//==============================================================================

// POSIX Threads Implementation:

//==============================================================================

#if defined(PEGASUS_HAVE_PTHREADS)

struct StartWrapperArg

{

void *(PEGASUS_THREAD_CDECL * start) (void *);

void *arg;

};

#if defined(PEGASUS_OS_TYPE_WINDOWS)

extern "C" void *_start_wrapper(void *arg_)

# include "ThreadWindows.cpp"

{

#elif defined(PEGASUS_OS_TYPE_UNIX)

StartWrapperArg *arg = (StartWrapperArg *) arg_;

# include "ThreadUnix.cpp"

#elif defined(PEGASUS_OS_TYPE_NSK)

void *return_value = (*arg->start) (arg->arg);

# include "ThreadNsk.cpp"

delete arg;

return return_value;

}

void Thread::cancel()

{

_cancelled = true;

pthread_cancel(_handle.thid.tt_handle());

}

void Thread::test_cancel()

{

#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM)

pthread_testintr();

#else

# error "Unsupported platform"

pthread_testcancel();

#endif

}

PEGASUS_NAMESPACE_BEGIN

Boolean Thread::is_cancelled(void)

{

return _cancelled;

}

void Thread::thread_switch()

{

#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM)

pthread_yield(NULL);

#else

sched_yield();

#endif

}

ATTN: why are these missing on other platforms?

#if defined(PEGASUS_PLATFORM_LINUX_GENERIC_GNU)

void Thread::suspend()

{

pthread_kill(_handle.thid.tt_handle(), SIGSTOP);

}

void Thread::resume()

{

pthread_kill(_handle.thid.tt_handle(), SIGCONT);

}

#endif

void Thread::sleep(Uint32 msec)

{

Threads::sleep(msec);

}

void Thread::join(void)

{

if (!_is_detached && Threads::id(_handle.thid) != 0)

pthread_join(_handle.thid.tt_handle(), &_exit_code);

Threads::clear(_handle.thid);

}

void Thread::thread_init(void)

{

#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM)

pthread_setintr(PTHREAD_INTR_ENABLE);

pthread_setintrtype(PTHREAD_INTR_ASYNCHRONOUS);

#else

pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);

pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);

#endif

_cancel_enabled = true;

}

void Thread::detach(void)

{

_is_detached = true;

pthread_detach(_handle.thid.tt_handle());

}

ThreadStatus Thread::run()

{

StartWrapperArg *arg = new StartWrapperArg;

arg->start = _start;

arg->arg = this;

Threads::Type type = _is_detached ? Threads::DETACHED : Threads::JOINABLE;

int rc = Threads::create(_handle.thid, type, _start_wrapper, arg);

// On Linux distributions released prior 2005, the implementation of

// Native POSIX Thread Library returns ENOMEM instead of EAGAIN when

// there

// are no insufficient memory. Hence we are checking for both. See bug

// 386.

if ((rc == EAGAIN) || (rc == ENOMEM))

{

Threads::clear(_handle.thid);

delete arg;

return PEGASUS_THREAD_INSUFFICIENT_RESOURCES;

}

else if (rc != 0)

{

Threads::clear(_handle.thid);

delete arg;

return PEGASUS_THREAD_SETUP_FAILURE;

}

return PEGASUS_THREAD_OK;

}

static sigset_t *block_signal_mask(sigset_t * sig)

{

sigemptyset(sig);

// should not be used for main()

sigaddset(sig, SIGHUP);

sigaddset(sig, SIGINT);

// maybe useless, since KILL can't be blocked according to POSIX

sigaddset(sig, SIGKILL);

sigaddset(sig, SIGABRT);

sigaddset(sig, SIGALRM);

sigaddset(sig, SIGPIPE);

// Note: older versions of the linux pthreads library use SIGUSR1 and SIGUSR2

// internally to stop and start threads that are blocking, the newer ones

// implement this through the kernel's real time signals

// since SIGSTOP/CONT can handle suspend()/resume() on Linux

// block them

// #if defined(PEGASUS_PLATFORM_LINUX_IX86_GNU)

// sigaddset(sig, SIGUSR1);

// sigaddset(sig, SIGUSR2);

// #endif

#ifndef PEGASUS_PLATFORM_ZOS_ZSERIES_IBM

pthread_sigmask(SIG_BLOCK, sig, NULL);

#else

sigprocmask(SIG_BLOCK, sig, NULL);

#endif

return sig;

}

Thread::Thread(ThreadReturnType(PEGASUS_THREAD_CDECL * start) (void *), void *parameter, Boolean detached):_is_detached(detached),

_cancel_enabled(true),

_cancelled(false),

_start(start), _cleanup(), _tsd(), _thread_parm(parameter), _exit_code(0)

{

Threads::clear(_handle.thid);

}

Thread::~Thread()

{

try

{

join();

empty_tsd();

}

catch(...)

{

// Do not allow the destructor to throw an exception

}

#endif /* PEGASUS_HAVE_PTHREADS */

//==============================================================================

// Windows Threads Implementation:

//==============================================================================

#if defined(PEGASUS_HAVE_WINDOWS_THREADS)

ThreadStatus Thread::run(void)

{

// Note: A Win32 thread ID is not the same thing as a pthread ID.

// Win32 threads have both a thread ID and a handle. The handle

// is used in the wait functions, etc.

// So _handle.thid is actually the thread handle.

unsigned threadid = 0;

ThreadType tt;

tt.handle = (HANDLE) _beginthreadex(NULL, 0, _start, this, 0, &threadid);

_handle.thid = tt;

if (Threads::id(_handle.thid) == 0)

{

if (errno == EAGAIN)

{

return PEGASUS_THREAD_INSUFFICIENT_RESOURCES;

}

else

{

return PEGASUS_THREAD_SETUP_FAILURE;

}

return PEGASUS_THREAD_OK;

}

void Thread::cancel(void)

{

_cancelled = true;

}

void Thread::test_cancel(void)

{

if (_cancel_enabled && _cancelled)

{

exit_self(0);

}

Boolean Thread::is_cancelled(void)

{

return _cancelled;

}

void Thread::thread_switch(void)

{

Sleep(0);

}

void Thread::sleep(Uint32 milliseconds)

{

Sleep(milliseconds);

}

void Thread::join(void)

{

if (Threads::id(_handle.thid) != 0)

{

if (!_is_detached)

{

if (!_cancelled)

{

// Emulate the unix join api. Caller sleeps until thread is

// done.

WaitForSingleObject(_handle.thid.handle, INFINITE);

}

else

{

// Currently this is the only way to ensure this code does

// not

// hang forever.

if (WaitForSingleObject(_handle.thid.handle, 10000) ==

WAIT_TIMEOUT)

{

TerminateThread(_handle.thid.handle, 0);

}

DWORD exit_code = 0;

GetExitCodeThread(_handle.thid.handle, &exit_code);

_exit_code = (ThreadReturnType) exit_code;

}

CloseHandle(_handle.thid.handle);

Threads::clear(_handle.thid);

}

void Thread::thread_init(void)

{

_cancel_enabled = true;

}

void Thread::detach(void)

{

_is_detached = true;

}

Thread::Thread(ThreadReturnType(PEGASUS_THREAD_CDECL * start) (void *),

void *parameter,

Boolean detached):_is_detached(detached),

_cancel_enabled(true),

_cancelled(false),

_start(start), _cleanup(), _tsd(), _thread_parm(parameter), _exit_code(0)

{

Threads::clear(_handle.thid);

}

Thread::~Thread()

{

try

{

join();

empty_tsd();

}

catch(...)

{

}

#endif /* PEGASUS_HAVE_WINDOWS_THREADS */

//==============================================================================

// Common implementation:

//==============================================================================

void thread_data::default_delete(void * data)

{

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Line 376

::operator delete(data);

}

// l10n start

void language_delete(void * data)

{

if( data != NULL)

{

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

AutoPtr < AcceptLanguageList > al(static_cast <

delete al;

AcceptLanguageList * >(data));

}

// l10n end

Boolean Thread::_signals_blocked = false;

// l10n

#ifndef PEGASUS_OS_ZOS

PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key;

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

#else

TSDKeyType Thread::_platform_thread_key;

#endif

Boolean Thread::_key_initialized = false;

Boolean Thread::_key_error = false;

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

// for non-native implementations

#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_front(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_front());

}

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

void Thread::exit_self(ThreadReturnType exit_code)

void Thread::exit_self(PEGASUS_THREAD_RETURN exit_code)

{

#if defined(PEGASUS_PLATFORM_HPUX_ACC) || \

defined(PEGASUS_PLATFORM_LINUX_GENERIC_GNU)

// NOTE: pthread_exit exhibits unusual behavior on RHEL 3 U2, as

// documented in Bugzilla 3836. Where feasible, it may be advantageous

// to avoid using this function.

pthread_exit(exit_code);

#else

// execute the cleanup stack and then return

while( _cleanup.count() )

while (_cleanup.size())

{

try

{

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Line 444

}

_exit_code = exit_code;

exit_thread(exit_code);

Threads::exit(exit_code);

_handle.thid = 0;

Threads::clear(_handle.thid);

}

#endif

}

// l10n start

Sint8 Thread::initializeKey()

{

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

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Line 461

return -1;

}

if (pegasus_key_create(&Thread::_platform_thread_key) == 0)

if (TSDKey::create(&Thread::_platform_thread_key) == 0)

{

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

"Thread: able to create a thread key");

Line 172

Line 488

return NULL;

}

PEG_METHOD_EXIT();

return (Thread *)pegasus_get_thread_specific(_platform_thread_key);

return (Thread *) TSDKey::get_thread_specific(_platform_thread_key);

}

void Thread::setCurrent(Thread * thrd)

Line 180

Line 496

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

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

{

if (pegasus_set_thread_specific(Thread::_platform_thread_key,

if (TSDKey::

set_thread_specific(Thread::_platform_thread_key,

(void *) thrd) == 0)

{

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

Line 189

Line 506

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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Line 536

// deletes the old tsd and creates a new one

currentThrd->put_tsd("acceptLanguages",

language_delete,

sizeof(AcceptLanguages *),

sizeof (AcceptLanguageList *), langs);

langs);

}

PEG_METHOD_EXIT();

Line 239

Line 555

PEG_METHOD_EXIT();

}

// l10n end

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(),

_runningThreads(), _dying(0)

{

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

_deallocateWait.tv_sec = deallocateWait.tv_sec;

_deallocateWait.tv_usec = deallocateWait.tv_usec;

pegasus_gettimeofday(&now);

memset(_key, 0x00, 17);

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

if (key != 0)

{

_pools.lock();

ThreadPool *p = _pools.next(0);

while(p != 0)

{

try

{

p->kill_dead_threads();

strncpy(_key, key, 16);

}

catch(...)

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

{

_maxThreads = initialSize;

}

p = _pools.next(p);

}

_pools.unlock();

pegasus_gettimeofday(&last);

}

ThreadPool::ThreadPool(Sint16 initial_size,

if (_minThreads > initialSize)

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;

_minThreads = initialSize;

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

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

{

_link_pool(_init_thread());

_addToIdleThreadsQueue(_initializeThread());

}

_pools.insert_last(this);

}

ThreadPool::~ThreadPool()

ThreadPool::~ThreadPool(void)

{

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

try

{

_pools.remove(this);

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

// entered

_dying++;

Thread *th = 0;

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

th = _pool.remove_first();

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

while(th != 0)

{

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

if(sleep_sem == 0)

while (_currentThreads.get() > 0)

{

th->dereference_tsd();

Thread *thread = _idleThreads.remove_front();

throw NullPointer();

if (thread != 0)

}

sleep_sem->signal();

th->dereference_tsd();

// signal the thread's sleep semaphore

th->cancel();

th->join();

th->empty_tsd();

delete th;

th = _pool.remove_first();

}

th = _running.remove_first();

while(th != 0)

{

// signal the thread's sleep semaphore

_cleanupThread(thread);

th->cancel();

_currentThreads--;

th->join();

th->empty_tsd();

delete th;

th = _running.remove_first();

}

else

th = _dead.remove_first();

while(th != 0)

{

// signal the thread's sleep semaphore

Threads::yield();

th->cancel();

}

th->join();

th->empty_tsd();

delete th;

th = _dead.remove_first();

}

catch(...)

Line 362

Line 627

}

// make this static to the class

ThreadReturnType PEGASUS_THREAD_CDECL ThreadPool::_loop(void *parm)

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)

{

PEG_METHOD_EXIT();

Thread *myself = (Thread *) parm;

throw NullPointer();

PEGASUS_ASSERT(myself != 0);

}

// 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);

{

PEG_METHOD_EXIT();

throw NullPointer();

}

Semaphore *sleep_sem = 0;

Semaphore *blocking_sem = 0;

struct timeval *deadlock_timer = 0;

Semaphore *sleep_sem = 0;

struct timeval *lastActivityTime = 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(IPCException &)

{

PEG_METHOD_EXIT();

myself->exit_self(0);

}

catch(...)

{

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

"ThreadPool::_loop: Failure getting sleep_sem or "

"lastActivityTime.");

PEGASUS_ASSERT(false);

pool->_idleThreads.remove(myself);

pool->_currentThreads--;

PEG_METHOD_EXIT();

myself->exit_self(0);

return ((ThreadReturnType) 1);

}

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

while (1)

{

PEG_METHOD_EXIT();

try

throw NullPointer();

}

while(pool->_dying < 1)

{

sleep_sem->wait();

}

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 ((ThreadReturnType) 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

if(pool->_dying > 0)

// _idleThreads queue.

break;

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

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

void *parm = 0;

Semaphore *blocking_sem = 0;

try

{

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

work = (ThreadReturnType(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");

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.");

PEGASUS_ASSERT(false);

pool->_idleThreads.remove(myself);

pool->_currentThreads--;

PEG_METHOD_EXIT();

myself->exit_self(0);

return ((ThreadReturnType) 1);

}

if(_work == 0)

if (work == 0)

{

PEG_METHOD_EXIT();

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

throw NullPointer();

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

break;

}

if(_work ==

Time::gettimeofday(lastActivityTime);

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

{

_work(parm);

}

gettimeofday(deadlock_timer, NULL);

try

{

_work(parm);

PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4,

"Work starting.");

work(parm);

PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4,

"Work finished.");

}

catch(Exception & e)

{

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)

{

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

String

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

+ e.what());

}

#endif

catch(...)

{

gettimeofday(deadlock_timer, NULL);

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

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

}

gettimeofday(deadlock_timer, NULL);

if( blocking_sem != 0 )

blocking_sem->signal();

// put myself back onto the available list

try

{

pool->_running.remove((void *)myself);

Time::gettimeofday(lastActivityTime);

pool->_link_pool(myself);

if (blocking_sem != 0)

{

blocking_sem->signal();

}

catch(IPCException &)

pool->_runningThreads.remove(myself);

pool->_idleThreads.insert_front(myself);

}

catch(...)

{

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

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

PEGASUS_ASSERT(false);

pool->_currentThreads--;

PEG_METHOD_EXIT();

myself->exit_self(0);

return ((ThreadReturnType) 1);

}

// wait to be awakend by the thread pool destructor

}

sleep_sem->wait();

catch(const Exception & e)

myself->test_cancel();

{

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"Caught exception: \"" + e.getMessage() +

"\". Exiting _loop.");

}

catch(...)

{

PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2,

"Caught unrecognized exception. Exiting _loop.");

}

PEG_METHOD_EXIT();

myself->exit_self(0);

return ((ThreadReturnType) 0);

return((PEGASUS_THREAD_RETURN)0);

}

void ThreadPool::allocate_and_awaken(void *parm,

ThreadStatus ThreadPool::allocate_and_awaken(void *parm,

PEGASUS_THREAD_RETURN \

ThreadReturnType

(PEGASUS_THREAD_CDECL *work)(void *),

(PEGASUS_THREAD_CDECL *

work) (void *),

Semaphore *blocking)

throw(IPCException)

{

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

struct timeval start;

gettimeofday(&start, NULL);

Thread *th = _pool.remove_first();

// Allocate_and_awaken will not run if the _dying flag is set.

// Once the lock is acquired, ~ThreadPool will not change

// the value of _dying until the lock is released.

// wait for the right interval and try again

try

while (th == 0 && _dying < 1)

{

if (_dying.get())

{

_check_deadlock(&start) ;

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

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

return PEGASUS_THREAD_UNAVAILABLE;

}

struct timeval start;

Time::gettimeofday(&start);

Thread *th = 0;

th = _idleThreads.remove_front();

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

if (th == 0)

{

if ((_maxThreads == 0) ||

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

{

th = _init_thread();

th = _initializeThread();

continue;

}

pegasus_yield();

th = _pool.remove_first();

}

if (th == 0)

if(_dying < 1)

{

// 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.size(), _idleThreads.size());

return PEGASUS_THREAD_INSUFFICIENT_RESOURCES;

}

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

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

"Initializing thread with work function and parameters: parm = %p",

Line 526

Line 851

th->delete_tsd("work func");

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

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

sizeof (ThreadReturnType(PEGASUS_THREAD_CDECL *)

(void *)work);

(void *)), (void *) work);

th->delete_tsd("work parm");

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

th->delete_tsd("blocking sem");

Line 535

Line 860

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

// put the thread on the running list

_running.insert_first(th);

_runningThreads.insert_front(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();

PEG_METHOD_EXIT();

throw NullPointer();

}

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

sleep_sem->signal();

th->dereference_tsd();

}

else

catch(...)

_pool.insert_first(th);

{

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

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

PEG_METHOD_EXIT();

// 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)

{

struct timeval now;

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

gettimeofday(&now, NULL);

Uint32 bodies = 0;

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

while(_dead.count() > 0)

{

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;

}

DQueue<Thread> * map[2] =

{

&_pool, &_running

};

Uint32 numThreadsCleanedUp = 0;

DQueue<Thread> *q = 0;

Uint32 numIdleThreads = _idleThreads.size();

int i = 0;

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

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

// Do not dip below the minimum thread count

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

{

q->try_lock();

break;

}

catch(...)

Thread *thread = _idleThreads.remove_back();

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

// done.

if (thread == 0)

{

return bodies;

break;

}

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_back(thread);

}

break;

if(dtp != 0)

{

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

}

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)

Boolean cleanupThisThread =

{

_timeIntervalExpired(lastActivityTime, &_deallocateWait);

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

thread->dereference_tsd();

// down to the minimum thread count

_current_threads--;

if (cleanupThisThread)

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

{

_cleanupThread(thread);

if( i == 0)

_currentThreads--;

{

numThreadsCleanedUp++;

_current_threads++;

th = q->next(th);

continue;

}

else

{

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

_idleThreads.insert_front(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,

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

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

(void *)&_undertaker);

thread->delete_tsd("work func");

th->delete_tsd("work parm");

thread->put_tsd("work func", 0,

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

sizeof (ThreadReturnType(PEGASUS_THREAD_CDECL *)

(void *)), (void *) 0);

thread->delete_tsd("work parm");

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);

sleep_sem->signal();

thread->dereference_tsd();

if(sleep_sem == 0)

thread->join();

{

delete thread;

q->unlock();

th->dereference_tsd();

throw NullPointer();

}

bodies++;

PEG_METHOD_EXIT();

th->dereference_tsd();

_dead.insert_first(th);

sleep_sem->signal();

th = 0;

}

else

{

// deadlocked threads

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

th->cancel();

delete th;

}

th = q->next(th);

pegasus_sleep(1);

}

q->unlock();

while (needed.value() > 0)

{

_link_pool(_init_thread());

needed--;

pegasus_sleep(0);

}

return bodies;

}

Boolean ThreadPool::_timeIntervalExpired(struct timeval *start,

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

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);

Time::gettimeofday(&now);

/* remove valgrind error */

Time::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 746

Line 988

usec %= 1000000;

finish.tv_usec = usec;

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

return (Time::subtract(&remaining, &finish, &now) != 0);

return true;

else

return false;

}

PEGASUS_THREAD_RETURN ThreadPool::_undertaker( void *parm )

{

exit_thread((PEGASUS_THREAD_RETURN)1);

return (PEGASUS_THREAD_RETURN)1;

}

void ThreadPool::_deleteSemaphore(void *p)

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));

Time::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++;

{

pegasus_yield();

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

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

delete th;

return 0;

}

_currentThreads++;

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

throw NullPointer();

_pool.insert_first(th);

}

try

{

_idleThreads.insert_front(th);

}

catch(...)

{

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

"ThreadPool::_addToIdleThreadsQueue: _idleThreads.insert_front "

"failed.");

}

// ATTN: not sure where to put this!

#ifdef PEGASUS_ZOS_SECURITY

bool isEnhancedSecurity = 99;

#endif

PEGASUS_NAMESPACE_END

Legend:

Removed from v.1.44
changed lines
	Added in v.1.90.2.8

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