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

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Diff for /pegasus/src/Pegasus/Common/Thread.cpp between version 1.53 and 1.107

version 1.53, 2003/10/18 01:42:26

version 1.107, 2008/09/16 18:37:03

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 21

Line 29

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

// Author: Mike Day (mdday@us.ibm.com)

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

// added nsk platform support

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

#include "Thread.h"

#include <Pegasus/Common/IPC.h>

#include <errno.h>

#include <exception>

#include <Pegasus/Common/Tracer.h>

#include <Pegasus/Common/AutoPtr.h>

#include "Time.h"

#if defined(PEGASUS_OS_TYPE_WINDOWS)

PEGASUS_USING_STD;

# include "ThreadWindows.cpp"

#elif defined(PEGASUS_OS_TYPE_UNIX)

# include "ThreadUnix.cpp"

#elif defined(PEGASUS_OS_TYPE_NSK)

# include "ThreadNsk.cpp"

#else

# error "Unsupported platform"

#endif

PEGASUS_NAMESPACE_BEGIN

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

// POSIX Threads Implementation:

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

void thread_data::default_delete(void * data)

#if defined(PEGASUS_HAVE_PTHREADS)

{

if( data != NULL)

::operator delete(data);

}

// l10n start

struct StartWrapperArg

void language_delete(void * data)

{

if( data != NULL)

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

void *arg;

};

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

{

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

// Clean up dynamic memory now to prevent a leak if the thread is canceled.

delete al;

StartWrapperArg arg;

}

arg.start = ((StartWrapperArg *) arg_)->start;

}

arg.arg = ((StartWrapperArg *) arg_)->arg;

// l10n end

delete (StartWrapperArg *) arg_;

Boolean Thread::_signals_blocked = false;

// establish cancelability of the thread

// l10n

pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);

PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key = -1;

pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);

Boolean Thread::_key_initialized = false;

Boolean Thread::_key_error = false;

void *return_value = (*arg.start) (arg.arg);

// for non-native implementations

return return_value;

#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;

throw;

}

return;

}

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

void Thread::cancel()

{

cleanup_handler *cu ;

try

{

cu = _cleanup.remove_first() ;

}

catch(IPCException&)

{

PEGASUS_ASSERT(0);

pthread_cancel(_handle.thid.thread);

}

if(execute == true)

cu->execute();

delete cu;

}

#endif

void Thread::thread_switch()

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

#ifndef PEGASUS_THREAD_EXIT_NATIVE

void Thread::exit_self(PEGASUS_THREAD_RETURN exit_code)

{

// execute the cleanup stack and then return

while( _cleanup.count() )

{

try

#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM)

{

pthread_yield(NULL);

cleanup_pop(true);

#else

}

sched_yield();

catch(IPCException&)

{

PEGASUS_ASSERT(0);

break;

}

_exit_code = exit_code;

exit_thread(exit_code);

_handle.thid = 0;

}

#endif

// l10n start

Sint8 Thread::initializeKey()

{

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

if (!Thread::_key_initialized)

{

if (Thread::_key_error)

{

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

"Thread: ERROR - thread key error");

return -1;

}

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

void Thread::sleep(Uint32 msec)

{

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

Threads::sleep(msec);

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

Thread::_key_initialized = true;

}

else

{

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

"Thread: ERROR - unable to create a thread key");

Thread::_key_error = true;

return -1;

}

PEG_METHOD_EXIT();

return 0;

}

Thread * Thread::getCurrent()

void Thread::join()

{

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

if (!_is_detached && !Threads::null(_handle.thid))

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

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

{

return NULL;

}

PEG_METHOD_EXIT();

return (Thread *)pegasus_get_thread_specific(_platform_thread_key);

}

void Thread::setCurrent(Thread * thrd)

Threads::clear(_handle.thid);

{

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

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

{

if (pegasus_set_thread_specific(Thread::_platform_thread_key,

(void *) thrd) == 0)

{

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

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

}

else

{

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

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

}

PEG_METHOD_EXIT();

}

AcceptLanguages * Thread::getLanguages()

void Thread::detach()

{

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

_is_detached = true;

#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM)

Thread * curThrd = Thread::getCurrent();

pthread_t thread_id=_handle.thid.thread;

if (curThrd == NULL)

pthread_detach(&thread_id);

return NULL;

#else

AcceptLanguages * acceptLangs =

pthread_detach(_handle.thid.thread);

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

#endif

curThrd->dereference_tsd();

PEG_METHOD_EXIT();

return acceptLangs;

}

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

ThreadStatus Thread::run()

{

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

StartWrapperArg *arg = new StartWrapperArg;

arg->start = _start;

arg->arg = this;

Thread * currentThrd = Thread::getCurrent();

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

if (currentThrd != NULL)

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

{

// deletes the old tsd and creates a new one

currentThrd->put_tsd("acceptLanguages",

language_delete,

sizeof(AcceptLanguages *),

langs);

}

PEG_METHOD_EXIT();

// 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.

void Thread::clearLanguages() //l10n

if (rc == -1)

rc = errno;

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

{

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

Threads::clear(_handle.thid);

delete arg;

Thread * currentThrd = Thread::getCurrent();

return PEGASUS_THREAD_INSUFFICIENT_RESOURCES;

if (currentThrd != NULL)

{

// deletes the old tsd

currentThrd->delete_tsd("acceptLanguages");

}

PEG_METHOD_EXIT();

}

// l10n end

else if (rc != 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());

Threads::clear(_handle.thid);

delete arg;

return PEGASUS_THREAD_SETUP_FAILURE;

}

~timed_mutex(void)

return PEGASUS_THREAD_OK;

{

_mut->unlock();

}

Mutex* _mut;

};

class try_mutex

Thread::Thread(

ThreadReturnType(PEGASUS_THREAD_CDECL* start) (void*),

void* parameter,

Boolean detached)

: _is_detached(detached),

_start(start),

_cleanup(),

_tsd(),

_thread_parm(parameter),

_exit_code(0)

{

public:

Threads::clear(_handle.thid);

try_mutex(Mutex* mut)

:_mut(mut)

{

_mut->try_lock(pegasus_thread_self());

}

~try_mutex(void)

{

_mut->unlock();

}

Mutex* _mut;

Thread::~Thread()

};

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

void ThreadPool::kill_idle_threads(void)

{

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

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();

join();

empty_tsd();

}

catch(...)

{

}

// Do not allow the destructor to throw an exception

p = _pools.next(p);

}

_pools.unlock();

pegasus_gettimeofday(&last);

}

#endif /* PEGASUS_HAVE_PTHREADS */

ThreadPool::ThreadPool(Sint16 initial_size,

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

const Sint8 *key,

Sint16 min,

// Windows Threads Implementation:

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());

}

_pools.insert_last(this);

}

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

#if defined(PEGASUS_HAVE_WINDOWS_THREADS)

// 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)

ThreadStatus Thread::run()

{

try

// 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

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

// is used in the wait functions, etc.

{

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

auto_mutex(&(this->_monitor));

_dying++;

}

// remove from the global pools list

_pools.remove(this);

// start with idle threads.

unsigned threadid = 0;

Thread *th = 0;

th = _pool.remove_first();

Semaphore* sleep_sem;

while(th != 0)

ThreadType tt;

{

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

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

_handle.thid = tt;

if(sleep_sem == 0)

{

th->dereference_tsd();

throw NullPointer();

}

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

sleep_sem->signal();

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

if (Threads::null(_handle.thid))

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

// Note: the current implementation of Thread for Windows

// 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();

while(th != 0)

{

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

if (errno == EAGAIN)

if(sleep_sem == 0)

{

th->dereference_tsd();

return PEGASUS_THREAD_INSUFFICIENT_RESOURCES;

throw NullPointer();

}

else

// signal the thread's sleep semaphore

sleep_sem->signal();

th->dereference_tsd();

th->cancel();

th->join();

delete th;

th = _dead.remove_first();

}

{

th = _running.remove_first();

while(th != 0)

{

// signal the thread's sleep semaphore

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

if(sleep_sem == 0 )

{

th->dereference_tsd();

return PEGASUS_THREAD_SETUP_FAILURE;

throw NullPointer();

}

sleep_sem->signal();

th->dereference_tsd();

th->cancel();

pegasus_yield();

th->join();

delete th;

th = _running.remove_first();

}

return PEGASUS_THREAD_OK;

}

catch(...)

void Thread::cancel()

{

_cancelled = true;

}

// 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;

void Thread::thread_switch()

if(myself == 0)

{

PEG_METHOD_EXIT();

Sleep(0);

throw NullPointer();

}

// l10n

void Thread::sleep(Uint32 milliseconds)

// 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 )

{

PEG_METHOD_EXIT();

Sleep(milliseconds);

throw NullPointer();

}

if(pool->_dying.value())

{

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

Semaphore *sleep_sem = 0;

void Thread::join()

Semaphore *blocking_sem = 0;

struct timeval *deadlock_timer = 0;

try

{

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

if (!Threads::null(_handle.thid))

myself->dereference_tsd();

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

myself->dereference_tsd();

}

catch(...)

{

PEG_METHOD_EXIT();

if (!_is_detached)

return((PEGASUS_THREAD_RETURN)0);

}

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

{

PEG_METHOD_EXIT();

if (!_cancelled)

return((PEGASUS_THREAD_RETURN)0);

{

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

// done.

WaitForSingleObject(_handle.thid.handle, INFINITE);

}

else

while(pool->_dying.value() < 1)

{

try

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

// not

// hang forever.

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

WAIT_TIMEOUT)

{

sleep_sem->wait();

TerminateThread(_handle.thid.handle, 0);

}

catch(IPCException& )

{

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

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

DWORD exit_code = 0;

if(pool->_dying.value())

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

{

_exit_code = (ThreadReturnType) exit_code;

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

CloseHandle(_handle.thid.handle);

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

Threads::clear(_handle.thid);

void *parm = 0;

try

{

_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 &)

{

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

if(_work == 0)

void Thread::detach()

{

PEG_METHOD_EXIT();

_is_detached = true;

throw NullPointer();

}

if(_work ==

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

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

void *parameter,

Boolean detached):_is_detached(detached),

_cancelled(false),

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

{

_work(parm);

Threads::clear(_handle.thid);

}

gettimeofday(deadlock_timer, NULL);

Thread::~Thread()

try

{

timed_mutex(&(pool->_monitor), 1000);

if(pool->_dying.value())

{

_undertaker(parm);

}

_work(parm);

}

catch(...)

{

return((PEGASUS_THREAD_RETURN)0);

}

// put myself back onto the available list

try

{

timed_mutex(&(pool->_monitor), 1000);

join();

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

empty_tsd();

{

gettimeofday(deadlock_timer, NULL);

if( blocking_sem != 0 )

blocking_sem->signal();

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

// us and now "owns" our pointer.

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

pool->_pool.insert_first(myself);

}

else

{

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

catch(...)

{

PEG_METHOD_EXIT();

return((PEGASUS_THREAD_RETURN)0);

}

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

#endif /* PEGASUS_HAVE_WINDOWS_THREADS */

// 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,

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

PEGASUS_THREAD_RETURN \

(PEGASUS_THREAD_CDECL *work)(void *),

// Common implementation:

Semaphore *blocking)

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

throw(IPCException)

void thread_data::default_delete(void *data)

{

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

if (data != NULL)

struct timeval start;

::operator delete(data);

gettimeofday(&start, NULL);

}

Thread *th = 0;

try

void language_delete(void *data)

{

timed_mutex(&(this->_monitor), 1000);

if (data != NULL)

if(_dying.value())

{

return;

AutoPtr < AcceptLanguageList > al(static_cast <

AcceptLanguageList * >(data));

}

th = _pool.remove_first();

}

catch(...)

{

return;

}

Boolean Thread::_signals_blocked = false;

#ifndef PEGASUS_OS_ZOS

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

#else

TSDKeyType Thread::_platform_thread_key;

#endif

Boolean Thread::_key_initialized = false;

Boolean Thread::_key_error = false;

// wait for the right interval and try again

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

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

{

// will throw an IPCException&

_check_deadlock(&start) ;

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

{

th = _init_thread();

continue;

}

pegasus_yield();

try

{

timed_mutex(&(this->_monitor), 1000);

if(_dying.value())

{

return;

}

th = _pool.remove_first();

}

catch(...)

{

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

_cleanup.insert_front(cu.get());

cu.release();

return ;

}

if(_dying.value() < 1)

void Thread::cleanup_pop(Boolean execute)

{

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

AutoPtr < cleanup_handler > cu;

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

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

parm);

th->delete_tsd("work func");

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

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

(void *)work);

th->delete_tsd("work parm");

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

th->delete_tsd("blocking sem");

if(blocking != 0 )

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

try

{

timed_mutex(&(this->_monitor), 1000);

cu.reset(_cleanup.remove_front());

if(_dying.value())

{

th->cancel();

th->join();

delete th;

return;

}

// put the thread on the running list

_running.insert_first(th);

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

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

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();

}

catch(...)

{

PEG_METHOD_EXIT();

PEGASUS_ASSERT(0);

return;

}

else

{

th->cancel();

th->join();

delete th;

}

if (execute == true)

PEG_METHOD_EXIT();

cu->execute();

}

// 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

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

Uint32 ThreadPool::kill_dead_threads(void)

throw(IPCException)

{

struct timeval now;

gettimeofday(&now, NULL);

Uint32 bodies = 0;

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

void Thread::exit_self(ThreadReturnType exit_code)

try

{

timed_mutex(&(this->_monitor), 1000);

#if !defined(PEGASUS_PLATFORM_AIX_RS_IBMCXX) \

if(_dying.value() )

&& !defined(PEGASUS_PLATFORM_PASE_ISERIES_IBMCXX)

Threads::exit(exit_code);

#else

// execute the cleanup stack and then return

while (_cleanup.size())

{

return 0;

try

}

while(_dead.count() > 0 && _dying.value() == 0 )

{

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

cleanup_pop(true);

Thread *dead = _dead.remove_first();

if(dead == 0)

throw NullPointer();

dead->join();

delete dead;

}

catch(...)

{

PEGASUS_ASSERT(0);

break;

}

DQueue<Thread> * map[2] =

{

&_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

{

try

{

try_mutex(&(this->_monitor));

}

catch(IPCException&)

_exit_code = exit_code;

{

Threads::exit(exit_code);

return bodies;

Threads::clear(_handle.thid);

#endif

}

q = map[i];

Sint8 Thread::initializeKey()

if(q->count() > 0 )

{

try

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

if (!Thread::_key_initialized)

{

if(_dying.value())

if (Thread::_key_error)

{

return bodies;

PEG_TRACE_CSTRING(TRC_THREAD, Tracer::LEVEL1,

"Thread: ERROR - thread key error");

return -1;

}

q->try_lock();

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

}

catch(...)

{

return bodies;

PEG_TRACE_CSTRING(TRC_THREAD, Tracer::LEVEL4,

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

Thread::_key_initialized = true;

}

else

struct timeval dt = { 0, 0 };

struct timeval *dtp;

Thread *th = 0;

th = q->next(th);

while (th != 0 )

{

try

{

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

PEG_TRACE_CSTRING(TRC_THREAD, Tracer::LEVEL1,

"Thread: ERROR - unable to create a thread key");

Thread::_key_error = true;

return -1;

}

catch(...)

{

q->unlock();

return bodies;

}

if(dtp != 0)

PEG_METHOD_EXIT();

{

return 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)

Thread *Thread::getCurrent()

{

// 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)

{

_current_threads++;

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

th = q->next(th);

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

continue;

}

else

{

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

return NULL;

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

// we are about to kill

needed++;

}

PEG_METHOD_EXIT();

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

}

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

void Thread::setCurrent(Thread * thrd)

if(th != 0)

{

if( i == 0 )

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

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

{

th->delete_tsd("work func");

if (TSDKey::

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

set_thread_specific(Thread::_platform_thread_key,

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

(void *) thrd) == 0)

(void *)&_undertaker);

th->delete_tsd("work parm");

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

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

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

if(sleep_sem == 0)

{

q->unlock();

PEG_TRACE_CSTRING(TRC_THREAD, Tracer::LEVEL4,

th->dereference_tsd();

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

throw NullPointer();

}

bodies++;

th->dereference_tsd();

_dead.insert_first(th);

sleep_sem->signal();

th = 0;

}

else

{

// deadlocked threads

PEG_TRACE_CSTRING(TRC_THREAD, Tracer::LEVEL1,

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

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

th->cancel();

delete th;

}

th = q->next(th);

pegasus_yield();

}

q->unlock();

PEG_METHOD_EXIT();

}

if(_dying.value() )

return bodies;

while (needed.value() > 0) {

_link_pool(_init_thread());

needed--;

pegasus_sleep(0);

}

return bodies;

}

AcceptLanguageList *Thread::getLanguages()

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

{

// never time out if the interval is zero

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

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);

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

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

finish.tv_sec += (usec / 1000000);

usec %= 1000000;

finish.tv_usec = usec;

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

return true;

else

return false;

}

PEGASUS_THREAD_RETURN ThreadPool::_undertaker( void *parm )

Thread *curThrd = Thread::getCurrent();

{

if (curThrd == NULL)

exit_thread((PEGASUS_THREAD_RETURN)1);

return NULL;

return (PEGASUS_THREAD_RETURN)1;

AcceptLanguageList *acceptLangs =

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

curThrd->dereference_tsd();

PEG_METHOD_EXIT();

return acceptLangs;

}

void Thread::setLanguages(const AcceptLanguageList& langs)

void ThreadPool::_sleep_sem_del(void *p)

{

if(p != 0)

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

{

delete (Semaphore *)p;

}

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

Thread *currentThrd = Thread::getCurrent();

if (currentThrd != NULL)

{

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

AutoPtr<AcceptLanguageList> langsCopy(new AcceptLanguageList(langs));

throw Deadlock(pegasus_thread_self());

return;

}

Boolean ThreadPool::_check_deadlock_no_throw(struct timeval *start)

// deletes the old tsd and creates a new one

{

currentThrd->put_tsd(

return(check_time(start, &_deadlock_detect));

"acceptLanguages",

}

language_delete,

sizeof (AcceptLanguageList *),

langsCopy.get());

Boolean ThreadPool::_check_dealloc(struct timeval *start)

langsCopy.release();

{

return(check_time(start, &_deallocate_wait));

}

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

PEG_METHOD_EXIT();

{

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);

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

pegasus_gettimeofday(dldt);

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

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

th->run();

_current_threads++;

pegasus_yield();

return th;

}

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

void Thread::clearLanguages()

{

if(th == 0)

throw NullPointer();

try

{

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

timed_mutex(&(this->_monitor), 1000);

Thread *currentThrd = Thread::getCurrent();

if(_dying.value())

if (currentThrd != NULL)

{

th->cancel();

// deletes the old tsd

th->join();

currentThrd->delete_tsd("acceptLanguages");

delete th;

}

_pool.insert_first(th);

PEG_METHOD_EXIT();

}

catch(...)

{

}

// ATTN: not sure where to put this!

#ifdef PEGASUS_ZOS_SECURITY

bool isEnhancedSecurity = 99;

#endif

PEGASUS_NAMESPACE_END

Legend:

Removed from v.1.53
changed lines
	Added in v.1.107

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