version 1.1.2.7, 2001/08/16 14:10:46
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version 1.65, 2004/06/04 05:54:51
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//%///////////////////////////////////////////////////////////////////////////// |
//%2003//////////////////////////////////////////////////////////////////////// |
// | // |
// Copyright (c) 2000, 2001 The Open group, BMC Software, Tivoli Systems, IBM |
// Copyright (c) 2000, 2001, 2002 BMC Software, Hewlett-Packard Development |
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// Company, L. P., IBM Corp., The Open Group, Tivoli Systems. |
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// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L. P.; |
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// IBM Corp.; EMC Corporation, The Open Group. |
// | // |
// Permission is hereby granted, free of charge, to any person obtaining a copy | // Permission is hereby granted, free of charge, to any person obtaining a copy |
// of this software and associated documentation files (the "Software"), to | // of this software and associated documentation files (the "Software"), to |
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// | // |
// Author: Mike Day (mdday@us.ibm.com) | // Author: Mike Day (mdday@us.ibm.com) |
// | // |
// Modified By: |
// Modified By: Rudy Schuet (rudy.schuet@compaq.com) 11/12/01 |
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// added nsk platform support |
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// Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com) |
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// Amit K Arora, IBM (amita@in.ibm.com) for PEP#101 |
// | // |
//%///////////////////////////////////////////////////////////////////////////// | //%///////////////////////////////////////////////////////////////////////////// |
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#include "Thread.h" | #include "Thread.h" |
#include <Pegasus/Common/IPC.h> | #include <Pegasus/Common/IPC.h> |
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#include <Pegasus/Common/Tracer.h> |
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#if defined(PEGASUS_OS_TYPE_WINDOWS) | #if defined(PEGASUS_OS_TYPE_WINDOWS) |
# include "ThreadWindows.cpp" | # include "ThreadWindows.cpp" |
#elif defined(PEGASUS_OS_TYPE_UNIX) | #elif defined(PEGASUS_OS_TYPE_UNIX) |
# include "ThreadUnix.cpp" | # include "ThreadUnix.cpp" |
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#elif defined(PEGASUS_OS_TYPE_NSK) |
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# include "ThreadNsk.cpp" |
#else | #else |
# error "Unsupported platform" | # error "Unsupported platform" |
#endif | #endif |
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PEGASUS_NAMESPACE_BEGIN | PEGASUS_NAMESPACE_BEGIN |
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void thread_data::default_delete(void * data) |
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{ |
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if( data != NULL) |
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::operator delete(data); |
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} |
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// l10n start |
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void language_delete(void * data) |
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{ |
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if( data != NULL) |
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{ |
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AutoPtr<AcceptLanguages> al(static_cast<AcceptLanguages *>(data)); |
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} |
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} |
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// l10n end |
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Boolean Thread::_signals_blocked = false; | Boolean Thread::_signals_blocked = false; |
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// l10n |
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#ifndef PEGASUS_OS_ZOS |
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PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key = -1; |
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#else |
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PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key; |
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#endif |
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Boolean Thread::_key_initialized = false; |
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Boolean Thread::_key_error = false; |
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// for non-native implementations | // for non-native implementations |
#ifndef PEGASUS_THREAD_CLEANUP_NATIVE | #ifndef PEGASUS_THREAD_CLEANUP_NATIVE |
void Thread::cleanup_push( void (*routine)(void *), void *parm) throw(IPCException) | void Thread::cleanup_push( void (*routine)(void *), void *parm) throw(IPCException) |
{ | { |
cleanup_handler *cu = new cleanup_handler(routine, parm); |
AutoPtr<cleanup_handler> cu(new cleanup_handler(routine, parm)); |
try |
_cleanup.insert_first(cu.get()); |
{ |
cu.release(); |
_cleanup.insert_first(cu); |
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} |
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catch(IPCException& e) |
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{ |
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e = e; |
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delete cu; |
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throw; |
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} |
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return; | return; |
} | } |
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void Thread::cleanup_pop(Boolean execute) throw(IPCException) | void Thread::cleanup_pop(Boolean execute) throw(IPCException) |
{ | { |
cleanup_handler *cu ; |
AutoPtr<cleanup_handler> cu ; |
try | try |
{ | { |
cu = _cleanup.remove_first() ; |
cu.reset(_cleanup.remove_first()); |
} | } |
catch(IPCException& e) |
catch(IPCException&) |
{ | { |
e = e; |
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PEGASUS_ASSERT(0); | PEGASUS_ASSERT(0); |
} | } |
if(execute == true) | if(execute == true) |
cu->execute(); | cu->execute(); |
delete cu; |
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} | } |
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#endif | #endif |
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//thread_data *Thread::put_tsd(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) throw(IPCException) |
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#ifndef PEGASUS_THREAD_EXIT_NATIVE | #ifndef PEGASUS_THREAD_EXIT_NATIVE |
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{ | { |
cleanup_pop(true); | cleanup_pop(true); |
} | } |
catch(IPCException& e) |
catch(IPCException&) |
{ | { |
e = e; |
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PEGASUS_ASSERT(0); | PEGASUS_ASSERT(0); |
break; | break; |
} | } |
} | } |
_exit_code = exit_code; | _exit_code = exit_code; |
exit_thread(exit_code); | exit_thread(exit_code); |
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_handle.thid = 0; |
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} |
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#endif |
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// l10n start |
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Sint8 Thread::initializeKey() |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::initializeKey"); |
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if (!Thread::_key_initialized) |
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{ |
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if (Thread::_key_error) |
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{ |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"Thread: ERROR - thread key error"); |
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return -1; |
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} |
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if (pegasus_key_create(&Thread::_platform_thread_key) == 0) |
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{ |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"Thread: able to create a thread key"); |
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Thread::_key_initialized = true; |
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} |
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else |
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{ |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"Thread: ERROR - unable to create a thread key"); |
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Thread::_key_error = true; |
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return -1; |
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} |
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} |
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PEG_METHOD_EXIT(); |
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return 0; |
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} |
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Thread * Thread::getCurrent() |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::getCurrent"); |
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if (Thread::initializeKey() != 0) |
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{ |
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return NULL; |
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} |
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PEG_METHOD_EXIT(); |
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return (Thread *)pegasus_get_thread_specific(_platform_thread_key); |
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} |
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void Thread::setCurrent(Thread * thrd) |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::setCurrent"); |
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if (Thread::initializeKey() == 0) |
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{ |
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if (pegasus_set_thread_specific(Thread::_platform_thread_key, |
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(void *) thrd) == 0) |
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{ |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"Successful set Thread * into thread specific storage"); |
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} |
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else |
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{ |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"ERROR: got error setting Thread * into thread specific storage"); |
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} |
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} |
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PEG_METHOD_EXIT(); |
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} |
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AcceptLanguages * Thread::getLanguages() |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::getLanguages"); |
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Thread * curThrd = Thread::getCurrent(); |
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if (curThrd == NULL) |
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return NULL; |
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AcceptLanguages * acceptLangs = |
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(AcceptLanguages *)curThrd->reference_tsd("acceptLanguages"); |
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curThrd->dereference_tsd(); |
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PEG_METHOD_EXIT(); |
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return acceptLangs; |
} | } |
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void Thread::setLanguages(AcceptLanguages *langs) //l10n |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::setLanguages"); |
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Thread * currentThrd = Thread::getCurrent(); |
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if (currentThrd != NULL) |
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{ |
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// deletes the old tsd and creates a new one |
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currentThrd->put_tsd("acceptLanguages", |
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language_delete, |
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sizeof(AcceptLanguages *), |
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langs); |
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} |
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PEG_METHOD_EXIT(); |
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} |
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void Thread::clearLanguages() //l10n |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::clearLanguages"); |
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Thread * currentThrd = Thread::getCurrent(); |
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if (currentThrd != NULL) |
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{ |
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// deletes the old tsd |
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currentThrd->delete_tsd("acceptLanguages"); |
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} |
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PEG_METHOD_EXIT(); |
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} |
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// l10n end |
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#if 0 |
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// two special synchronization classes for ThreadPool |
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// |
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class timed_mutex |
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{ |
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public: |
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timed_mutex(Mutex* mut, int msec) |
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:_mut(mut) |
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{ |
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_mut->timed_lock(msec, pegasus_thread_self()); |
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} |
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~timed_mutex(void) |
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{ |
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_mut->unlock(); |
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} |
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Mutex* _mut; |
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}; |
#endif | #endif |
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class try_mutex |
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{ |
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public: |
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try_mutex(Mutex* mut) |
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:_mut(mut) |
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{ |
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_mut->try_lock(pegasus_thread_self()); |
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} |
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~try_mutex(void) |
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{ |
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_mut->unlock(); |
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} |
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Mutex* _mut; |
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}; |
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class auto_int |
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{ |
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public: |
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auto_int(AtomicInt* num) |
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: _int(num) |
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{ |
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_int->operator++(); |
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} |
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~auto_int(void) |
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{ |
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_int->operator--(); |
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} |
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AtomicInt *_int; |
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}; |
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AtomicInt _idle_control; |
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DQueue<ThreadPool> ThreadPool::_pools(true); |
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void ThreadPool::kill_idle_threads(void) |
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{ |
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static struct timeval now, last = {0, 0}; |
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pegasus_gettimeofday(&now); |
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if(now.tv_sec - last.tv_sec > 5) |
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{ |
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_pools.lock(); |
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ThreadPool *p = _pools.next(0); |
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while(p != 0) |
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{ |
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try |
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{ |
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p->kill_dead_threads(); |
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} |
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catch(...) |
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{ |
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} |
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p = _pools.next(p); |
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} |
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_pools.unlock(); |
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pegasus_gettimeofday(&last); |
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} |
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} |
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ThreadPool::ThreadPool(Sint16 initial_size, |
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const Sint8 *key, |
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Sint16 min, |
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Sint16 max, |
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struct timeval & alloc_wait, |
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struct timeval & dealloc_wait, |
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struct timeval & deadlock_detect) |
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: _max_threads(max), _min_threads(min), |
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_current_threads(0), |
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_pool(true), _running(true), |
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_dead(true), _dying(0) |
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{ |
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_allocate_wait.tv_sec = alloc_wait.tv_sec; |
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_allocate_wait.tv_usec = alloc_wait.tv_usec; |
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_deallocate_wait.tv_sec = dealloc_wait.tv_sec; |
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_deallocate_wait.tv_usec = dealloc_wait.tv_usec; |
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_deadlock_detect.tv_sec = deadlock_detect.tv_sec; |
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_deadlock_detect.tv_usec = deadlock_detect.tv_usec; |
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memset(_key, 0x00, 17); |
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if(key != 0) |
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strncpy(_key, key, 16); |
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if(_max_threads > 0 && _max_threads < initial_size) |
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_max_threads = initial_size; |
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if(_min_threads > initial_size) |
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_min_threads = initial_size; |
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int i; |
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for(i = 0; i < initial_size; i++) |
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{ |
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_link_pool(_init_thread()); |
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} |
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_pools.insert_last(this); |
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} |
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// Note: <<< Fri Oct 17 09:19:03 2003 mdd >>> |
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// the pegasus_yield() calls that preceed each th->join() are to |
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// give a thread on the running list a chance to reach a cancellation |
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// point before the join |
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ThreadPool::~ThreadPool(void) |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "Thread::~ThreadPool"); |
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try |
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{ |
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// Set the dying flag so all thread know the destructor has been entered |
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_dying++; |
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// remove from the global pools list |
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_pools.remove(this); |
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// start with idle threads. |
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Thread *th = 0; |
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th = _pool.remove_first(); |
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Semaphore* sleep_sem; |
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while(th != 0) |
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{ |
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sleep_sem = (Semaphore *)th->reference_tsd("sleep sem"); |
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PEGASUS_ASSERT(sleep_sem != 0); |
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if(sleep_sem == 0) |
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{ |
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th->dereference_tsd(); |
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} |
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else |
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{ |
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// Signal to get the thread out of the work loop. |
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sleep_sem->signal(); |
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// Signal to get the thread past the end. See the comment |
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// "wait to be awakend by the thread pool destructor" |
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// Note: the current implementation of Thread for Windows |
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// does not implement "pthread" cancelation points so this |
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// is needed. |
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sleep_sem->signal(); |
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th->dereference_tsd(); |
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th->cancel(); |
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th->join(); |
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delete th; |
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} |
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th = _pool.remove_first(); |
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} |
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while(_idle_control.value()) |
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pegasus_yield(); |
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th = _dead.remove_first(); |
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while(th != 0) |
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{ |
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sleep_sem = (Semaphore *)th->reference_tsd("sleep sem"); |
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PEGASUS_ASSERT(sleep_sem != 0); |
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if(sleep_sem == 0) |
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{ |
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th->dereference_tsd(); |
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} |
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else |
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{ |
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//ATTN-DME-P3-20030322: _dead queue processing in |
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//ThreadPool::~ThreadPool is inconsistent with the |
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//processing in kill_dead_threads. Is this correct? |
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// signal the thread's sleep semaphore |
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sleep_sem->signal(); |
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sleep_sem->signal(); |
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th->dereference_tsd(); |
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th->cancel(); |
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th->join(); |
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delete th; |
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} |
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th = _dead.remove_first(); |
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} |
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{ |
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th = _running.remove_first(); |
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while(th != 0) |
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{ |
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// signal the thread's sleep semaphore |
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sleep_sem = (Semaphore *)th->reference_tsd("sleep sem"); |
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PEGASUS_ASSERT(sleep_sem != 0); |
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if(sleep_sem == 0 ) |
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{ |
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th->dereference_tsd(); |
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} |
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else |
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{ |
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sleep_sem->signal(); |
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sleep_sem->signal(); |
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th->dereference_tsd(); |
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th->cancel(); |
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pegasus_yield(); |
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th->join(); |
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delete th; |
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} |
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th = _running.remove_first(); |
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} |
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} |
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} |
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catch(...) |
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{ |
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} |
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} |
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// make this static to the class |
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PEGASUS_THREAD_RETURN PEGASUS_THREAD_CDECL ThreadPool::_loop(void *parm) |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop"); |
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Thread *myself = (Thread *)parm; |
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if(myself == 0) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Thread pointer is null"); |
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PEG_METHOD_EXIT(); |
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throw NullPointer(); |
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} |
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// l10n |
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// Set myself into thread specific storage |
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// This will allow code to get its own Thread |
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Thread::setCurrent(myself); |
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ThreadPool *pool = (ThreadPool *)myself->get_parm(); |
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if(pool == 0 ) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: ThreadPool pointer is null"); |
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PEG_METHOD_EXIT(); |
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throw NullPointer(); |
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} |
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if(pool->_dying.value()) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: ThreadPool is dying(1)"); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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Semaphore *sleep_sem = 0; |
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Semaphore *blocking_sem = 0; |
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struct timeval *deadlock_timer = 0; |
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try |
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{ |
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sleep_sem = (Semaphore *)myself->reference_tsd("sleep sem"); |
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myself->dereference_tsd(); |
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deadlock_timer = (struct timeval *)myself->reference_tsd("deadlock timer"); |
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myself->dereference_tsd(); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Failure getting sleep_sem or deadlock_timer"); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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if(sleep_sem == 0 || deadlock_timer == 0) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: sleep_sem or deadlock_timer are null."); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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while(1) |
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{ |
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if(pool->_dying.value()) |
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break; |
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try |
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{ |
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sleep_sem->wait(); |
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} |
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catch(IPCException& ) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: failure on sleep_sem->wait()."); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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// when we awaken we reside on the running queue, not the pool queue |
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PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *_work)(void *) = 0; |
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void *parm = 0; |
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try |
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{ |
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_work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) \ |
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myself->reference_tsd("work func"); |
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myself->dereference_tsd(); |
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parm = myself->reference_tsd("work parm"); |
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myself->dereference_tsd(); |
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blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem"); |
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myself->dereference_tsd(); |
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} |
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catch(IPCException &) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Failure accessing work func, work parm, or blocking sem."); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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if(_work == 0) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: work func is null."); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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if(_work == |
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(PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) &_undertaker) |
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{ |
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PEG_METHOD_EXIT(); |
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_work(parm); |
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} |
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gettimeofday(deadlock_timer, NULL); |
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|
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if (pool->_dying.value() == 0) |
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{ |
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try |
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{ |
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_work(parm); |
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} |
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catch(Exception & e) |
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{ |
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PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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String("Exception from _work in ThreadPool::_loop: ") + |
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e.getMessage()); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: execution of _work failed."); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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} |
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|
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// put myself back onto the available list |
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try |
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{ |
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if(pool->_dying.value() == 0) |
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{ |
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gettimeofday(deadlock_timer, NULL); |
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if( blocking_sem != 0 ) |
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blocking_sem->signal(); |
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|
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// If we are not on _running then ~ThreadPool has removed |
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// us and now "owns" our pointer. |
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if ( pool->_running.remove((void *)myself) != 0 ) |
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{ |
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pool->_pool.insert_first(myself); |
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} |
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else |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Failed to remove thread from running queue."); |
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PEG_METHOD_EXIT(); |
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return((PEGASUS_THREAD_RETURN)0); |
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} |
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} |
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else |
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{ |
|
PEG_METHOD_EXIT(); |
|
return((PEGASUS_THREAD_RETURN)0); |
|
} |
|
} |
|
catch(...) |
|
{ |
|
Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
|
"ThreadPool::_loop: Adding thread to idle pool failed."); |
|
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); |
|
} |
|
|
|
Boolean ThreadPool::allocate_and_awaken(void *parm, |
|
PEGASUS_THREAD_RETURN \ |
|
(PEGASUS_THREAD_CDECL *work)(void *), |
|
Semaphore *blocking) |
|
throw(IPCException) |
|
{ |
|
PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken"); |
|
|
|
// 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. |
|
|
|
try |
|
{ |
|
if (_dying.value()) |
|
{ |
|
Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
|
"ThreadPool::allocate_and_awaken: ThreadPool is dying(1)."); |
|
// ATTN: Error result has not yet been defined |
|
return true; |
|
} |
|
struct timeval now; |
|
struct timeval start; |
|
gettimeofday(&start, NULL); |
|
Thread *th = 0; |
|
|
|
th = _pool.remove_first(); |
|
|
|
if (th == 0) |
|
{ |
|
// will throw an IPCException& |
|
_check_deadlock(&start) ; |
|
|
|
if(_max_threads == 0 || _current_threads < _max_threads) |
|
{ |
|
th = _init_thread(); |
|
} |
|
} |
|
|
|
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, dead threads = %d ", |
|
_key, _running.count(), _pool.count(), _dead.count()); |
|
return false; |
|
} |
|
|
|
// 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", |
|
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); |
|
|
|
// 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(); |
|
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(); |
|
} |
|
catch (...) |
|
{ |
|
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 true; |
|
} |
|
PEG_METHOD_EXIT(); |
|
return true; |
|
} |
|
|
|
// 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) |
|
{ |
|
// Since the kill_dead_threads, ThreadPool or allocate_and_awaken |
|
// manipulate the threads on the ThreadPool queues, they should never |
|
// be allowed to run at the same time. |
|
|
|
// << Thu Oct 23 14:41:02 2003 mdd >> |
|
// not true, the queues are thread safe. they are syncrhonized. |
|
|
|
auto_int do_not_destruct(&_idle_control); |
|
|
|
try |
|
{ |
|
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 |
|
try |
|
{ |
|
while(_dying.value() == 0 && _dead.count() > 0) |
|
{ |
|
Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "ThreadPool:: removing and joining dead thread"); |
|
Thread *dead = _dead.remove_first(); |
|
|
|
if(dead ) |
|
{ |
|
dead->join(); |
|
delete dead; |
|
} |
|
} |
|
} |
|
catch(...) |
|
{ |
|
} |
|
|
|
if (_dying.value()) |
|
{ |
|
return 0; |
|
} |
|
|
|
DQueue<Thread> * map[2] = |
|
{ |
|
&_pool, &_running |
|
}; |
|
|
|
|
|
DQueue<Thread> *q = 0; |
|
int i = 0; |
|
AtomicInt needed(0); |
|
Thread *th = 0; |
|
internal_dq idq; |
|
|
|
#ifdef PEGASUS_KILL_LONG_RUNNING_THREADS |
|
// Defining PEGASUS_KILL_LONG_RUNNING_THREADS causes the thread pool |
|
// to kill threads that are on the _running queue longer than the |
|
// _deadlock_detect time interval specified for the thread pool. |
|
// Cancelling long-running threads has proven to be problematic and |
|
// may cause a crash depending on the state of the thread when it is |
|
// killed. Use this option with care. |
|
for( ; i < 2; i++) |
|
#else |
|
for( ; i < 1; i++) |
|
#endif |
|
{ |
|
q = map[i]; |
|
if(q->count() > 0 ) |
|
{ |
|
try |
|
{ |
|
q->try_lock(); |
|
} |
|
catch(...) |
|
{ |
|
return bodies; |
|
} |
|
|
|
struct timeval dt = { 0, 0 }; |
|
struct timeval *dtp; |
|
|
|
th = q->next(th); |
|
while (th != 0 ) |
|
{ |
|
try |
|
{ |
|
dtp = (struct timeval *)th->try_reference_tsd("deadlock timer"); |
|
} |
|
catch(...) |
|
{ |
|
q->unlock(); |
|
return bodies; |
|
} |
|
|
|
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) |
|
{ |
|
// 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++; |
|
th = q->next(th); |
|
continue; |
|
} |
|
else |
|
{ |
|
// we are killing a hung thread and we will drop below the |
|
// minimum. create another thread to make up for the one |
|
// we are about to kill |
|
needed++; |
|
} |
|
} |
|
|
|
th = q->remove_no_lock((void *)th); |
|
idq.insert_first((void*)th); |
|
} |
|
th = q->next(th); |
|
} |
|
q->unlock(); |
|
} |
|
|
|
th = (Thread*)idq.remove_last(); |
|
while(th != 0) |
|
{ |
|
if( i == 0 ) |
|
{ |
|
th->delete_tsd("work func"); |
|
th->put_tsd("work func", NULL, |
|
sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)), |
|
(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"); |
|
PEGASUS_ASSERT(sleep_sem != 0); |
|
|
|
bodies++; |
|
th->dereference_tsd(); |
|
// Putting thread on _dead queue delays availability to others |
|
//_dead.insert_first(th); |
|
sleep_sem->signal(); |
|
th->join(); // Note: Clean up the thread here rather than |
|
delete th; // leave it sitting unused on the _dead queue |
|
th = 0; |
|
} |
|
else |
|
{ |
|
// deadlocked threads |
|
struct timeval deadlock_timeout; |
|
Tracer::trace(TRC_THREAD, Tracer::LEVEL2, |
|
"A thread has run longer than %u seconds and " |
|
"will be cancelled.", |
|
Uint32(_deadlock_detect.tv_sec)); |
|
Logger::put_l(Logger::ERROR_LOG, System::CIMSERVER, |
|
Logger::SEVERE, |
|
"Common.Thread.CANCEL_LONG_RUNNING_THREAD", |
|
"A thread has run longer than {0} seconds and " |
|
"will be cancelled.", |
|
Uint32(_deadlock_detect.tv_sec)); |
|
th->cancel(); |
|
delete th; |
|
} |
|
th = (Thread*)idq.remove_last(); |
|
} |
|
} |
|
|
|
while (needed.value() > 0) { |
|
_link_pool(_init_thread()); |
|
needed--; |
|
pegasus_sleep(0); |
|
} |
|
return bodies; |
|
} |
|
catch (...) |
|
{ |
|
} |
|
return 0; |
|
} |
|
|
|
|
|
Boolean ThreadPool::check_time(struct timeval *start, struct timeval *interval) |
|
{ |
|
// never time out if the interval is zero |
|
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 ) |
|
{ |
|
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) |
|
{ |
|
if (true == check_time(start, &_deadlock_detect)) |
|
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); |
|
|
|
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 |
|
|
|
if (!th->run()) |
|
{ |
|
delete th; |
|
return 0; |
|
} |
|
_current_threads++; |
|
pegasus_yield(); |
|
|
|
return th; |
|
} |
|
|
|
void ThreadPool::_link_pool(Thread *th) throw(IPCException) |
|
{ |
|
if(th == 0) |
|
{ |
|
Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
|
"ThreadPool::_link_pool: Thread pointer is null."); |
|
throw NullPointer(); |
|
} |
|
try |
|
{ |
|
_pool.insert_first(th); |
|
} |
|
catch(...) |
|
{ |
|
Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
|
"ThreadPool::_link_pool: _pool.insert_first failed."); |
|
} |
|
} |
|
|
|
|
PEGASUS_NAMESPACE_END | PEGASUS_NAMESPACE_END |
| |