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phoenix |
#ifndef CYGONCE_KERNEL_MBOXT_INL
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#define CYGONCE_KERNEL_MBOXT_INL
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//==========================================================================
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//
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// mboxt.inl
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//
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// Mboxt mbox template class implementation
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): hmt
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// Contributors: hmt
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// Date: 1998-02-10
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// Purpose: Mboxt template implementation
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// Description: This file contains the implementations of the mboxt
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// template classes.
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include
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#include // base kernel types
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#include // tracing macros
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#include // assertion macros
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#include // instrumentation
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#include // our header
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#include // thread inlines
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#include // scheduler inlines
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#include // clock inlines
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// -------------------------------------------------------------------------
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// inline function for awakening waiting threads
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template
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inline void
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Cyg_Mboxt::wakeup_waiter( Cyg_ThreadQueue &q )
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{
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if( !q.empty() ) {
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// The queue is non-empty, so grab the next thread and wake it up.
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Cyg_Thread *thread = q.dequeue();
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CYG_ASSERTCLASS( thread, "Bad thread pointer");
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thread->set_wake_reason( Cyg_Thread::DONE );
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thread->wake();
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CYG_INSTRUMENT_MBOXT(WAKE, this, thread);
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}
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}
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// -------------------------------------------------------------------------
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// Constructor
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template
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Cyg_Mboxt::Cyg_Mboxt()
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{
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CYG_REPORT_FUNCTION();
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base = 0;
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count = 0;
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}
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// -------------------------------------------------------------------------
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// Destructor
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template
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Cyg_Mboxt::~Cyg_Mboxt()
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{
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CYG_REPORT_FUNCTION();
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CYG_ASSERT( 0 == count, "Deleting mboxt with messages");
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CYG_ASSERT( get_threadq.empty(), "Deleting mboxt with threads waiting to get");
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#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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CYG_ASSERT( put_threadq.empty(), "Deleting mboxt with threads waiting to put");
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#endif
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}
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// -------------------------------------------------------------------------
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// debugging/assert function
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#ifdef CYGDBG_USE_ASSERTS
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template
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cyg_bool
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Cyg_Mboxt::check_this(cyg_assert_class_zeal zeal) const
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{
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CYG_REPORT_FUNCTION();
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if ( Cyg_Thread::DESTRUCT == Cyg_Thread::self()->get_wake_reason() )
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// then the whole thing is invalid, and we know it.
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// so return OK, since this check should NOT make an error.
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return true;
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// check that we have a non-NULL pointer first
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if( this == NULL ) return false;
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#if 0 // thread queues do not have checking funcs.
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if ( ! get_threadq.check_this( zeal ) ) return false;
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#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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if ( ! put_threadq.check_this( zeal ) ) return false;
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#endif
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#endif
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switch( zeal )
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{
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case cyg_system_test:
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case cyg_extreme:
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case cyg_thorough:
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case cyg_quick:
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case cyg_trivial:
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// plenty of scope for fencepost problems here
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if ( size < count ) return false;
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if ( size <= base ) return false;
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if ( 0 > count ) return false;
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if ( 0 > base ) return false;
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// there was initially a test of the form
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// (0 < count && count < size) && ! threadqueue.empty()
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// here - ie. there should only be people waiting if the Q is full
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// or empty. This is bogus, anyone else might run between a waiter
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// being awoken, so there can be a 2nd waiter in the Q and a free
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// slot (say) simultaneously.
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// Further, we need 2 queues; imagine a 10-slot itemqueue with 25
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// attempts to put to it, so 15 sleep. 10 other threads get,
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// awakening 10 of the 15 put-sleepers. Another one gets, and
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// can't because there is no data there _yet_; it sleeps, and the
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// 10 awakened threads cycle through the run queue, each putting,
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// the first awakens the get-sleeper, which in turn awakens a
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// further put-sleeper.
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// This requirement for 2 queue only holds if Ngetters > 2 * Nslots
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// or Nputters > 2 * Nslots; if these are both false, one queue
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// will suffice. This could be an optimisation for the future -
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// wow, 4 bytes.
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case cyg_none:
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default:
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break;
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};
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return true;
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}
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#endif
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// -------------------------------------------------------------------------
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// From here downwards, these are the major functions of the template; if
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// being genuinely used as a template they should probably not be inlined.
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// If being used to construct a specific class, with explicit functions,
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// then they should be. This is controlled by:
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#ifdef CYGIMP_MBOXT_INLINE
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#define CYG_MBOXT_INLINE inline
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#else
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#define CYG_MBOXT_INLINE
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#endif
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// -------------------------------------------------------------------------
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// Get an item, or wait for one to arrive
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template
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CYG_MBOXT_INLINE cyg_bool
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Cyg_Mboxt::get( T &ritem )
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{
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CYG_REPORT_FUNCTION();
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cyg_bool result = true;
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Cyg_Thread *self = Cyg_Thread::self();
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// Prevent preemption
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Cyg_Scheduler::lock();
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CYG_ASSERTCLASS( this, "Bad this pointer");
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CYG_INSTRUMENT_MBOXT(GET, this, count);
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// Loop while the mboxt is empty, sleeping each time around
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// the loop. This copes with the possibility of a higher priority
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// thread grabbing the message between the wakeup in unlock() and
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// this thread actually starting.
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while( result && (0 == count) ) {
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self->set_sleep_reason( Cyg_Thread::WAIT );
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self->sleep();
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get_threadq.enqueue( self );
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CYG_INSTRUMENT_MBOXT(WAIT, this, count);
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// Allow other threads to run
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Cyg_Scheduler::reschedule();
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CYG_ASSERTCLASS( this, "Bad this pointer");
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switch( self->get_wake_reason() )
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{
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case Cyg_Thread::DESTRUCT:
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case Cyg_Thread::BREAK:
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result = false;
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break;
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case Cyg_Thread::EXIT:
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self->exit();
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break;
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default:
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break;
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}
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}
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if ( result ) {
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CYG_INSTRUMENT_MBOXT(GOT, this, count);
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ritem = itemqueue[ (count--, base++) ];
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CYG_ASSERT( 0 <= count, "Count went -ve" );
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CYG_ASSERT( size >= base, "Base overflow" );
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if ( size <= base )
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base = 0;
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#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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wakeup_waiter( put_threadq );
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#endif
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}
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// Unlock the scheduler and maybe switch threads
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Cyg_Scheduler::unlock();
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CYG_ASSERTCLASS( this, "Bad this pointer");
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CYG_REPORT_RETVAL( result );
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return result;
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}
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// -------------------------------------------------------------------------
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// Try to get an item with an absolute timeout and return success.
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#ifdef CYGFUN_KERNEL_THREADS_TIMER
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template
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CYG_MBOXT_INLINE cyg_bool
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Cyg_Mboxt::get( T &ritem, cyg_tick_count abs_timeout )
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{
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CYG_REPORT_FUNCTION();
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cyg_bool result = true;
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Cyg_Thread *self = Cyg_Thread::self();
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// Prevent preemption
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Cyg_Scheduler::lock();
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CYG_ASSERTCLASS( this, "Bad this pointer");
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CYG_INSTRUMENT_MBOXT(GET, this, count);
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// Set the timer _once_ outside the loop.
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self->set_timer( abs_timeout, Cyg_Thread::TIMEOUT );
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// If the timeout is in the past, the wake reason will have been
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// set to something other than NONE already. Set the result false
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// to force an immediate return.
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if( self->get_wake_reason() != Cyg_Thread::NONE )
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result = false;
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// Loop while the mboxt is empty, sleeping each time around the loop.
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// This copes with the possibility of a higher priority thread grabbing
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// the message between the wakeup in put()&c and this thread actually
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// starting.
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while ( result && (0 == count) ) {
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// must reset the sleep reason every time
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self->set_sleep_reason( Cyg_Thread::TIMEOUT );
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self->sleep();
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get_threadq.enqueue( self );
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310 |
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311 |
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CYG_INSTRUMENT_MBOXT(WAIT, this, count);
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312 |
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313 |
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// Allow other threads to run
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314 |
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Cyg_Scheduler::reschedule();
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315 |
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316 |
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CYG_ASSERTCLASS( this, "Bad this pointer");
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317 |
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318 |
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switch( self->get_wake_reason() )
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{
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320 |
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case Cyg_Thread::TIMEOUT:
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result = false;
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322 |
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CYG_INSTRUMENT_MBOXT(TIMEOUT, this, count);
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break;
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324 |
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325 |
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case Cyg_Thread::DESTRUCT:
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326 |
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case Cyg_Thread::BREAK:
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327 |
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result = false;
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328 |
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break;
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329 |
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330 |
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case Cyg_Thread::EXIT:
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331 |
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self->exit();
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332 |
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break;
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333 |
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334 |
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default:
|
335 |
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break;
|
336 |
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}
|
337 |
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}
|
338 |
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|
339 |
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// clear the timer; if it actually fired, no worries.
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340 |
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self->clear_timer();
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341 |
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342 |
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if ( result ) {
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343 |
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344 |
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CYG_INSTRUMENT_MBOXT(GOT, this, count);
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345 |
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346 |
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ritem = itemqueue[ (count--, base++) ];
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347 |
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CYG_ASSERT( 0 <= count, "Count went -ve" );
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348 |
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CYG_ASSERT( size >= base, "Base overflow" );
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349 |
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350 |
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if ( size <= base )
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351 |
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base = 0;
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352 |
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353 |
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#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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354 |
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wakeup_waiter( put_threadq );
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355 |
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#endif
|
356 |
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}
|
357 |
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|
358 |
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// Unlock the scheduler and maybe switch threads
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359 |
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Cyg_Scheduler::unlock();
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360 |
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|
361 |
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CYG_ASSERTCLASS( this, "Bad this pointer");
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362 |
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CYG_REPORT_RETVAL( result );
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363 |
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return result;
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364 |
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}
|
365 |
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#endif // CYGFUN_KERNEL_THREADS_TIMER
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366 |
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|
367 |
|
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// -------------------------------------------------------------------------
|
368 |
|
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// Try to get an item and return success.
|
369 |
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|
370 |
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template
|
371 |
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CYG_MBOXT_INLINE cyg_bool
|
372 |
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Cyg_Mboxt::tryget( T &ritem )
|
373 |
|
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{
|
374 |
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CYG_REPORT_FUNCTION();
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375 |
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|
376 |
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CYG_ASSERTCLASS( this, "Bad this pointer");
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377 |
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|
378 |
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// Prevent preemption
|
379 |
|
|
Cyg_Scheduler::lock();
|
380 |
|
|
|
381 |
|
|
CYG_INSTRUMENT_MBOXT(TRY, this, count);
|
382 |
|
|
|
383 |
|
|
cyg_bool result = ( 0 < count );
|
384 |
|
|
// If the mboxt is not empty, grab an item and return it.
|
385 |
|
|
if ( result ) {
|
386 |
|
|
ritem = itemqueue[ (count--, base++) ];
|
387 |
|
|
CYG_ASSERT( 0 <= count, "Count went -ve" );
|
388 |
|
|
CYG_ASSERT( size >= base, "Base overflow" );
|
389 |
|
|
if ( size <= base )
|
390 |
|
|
base = 0;
|
391 |
|
|
|
392 |
|
|
#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
|
393 |
|
|
wakeup_waiter( put_threadq );
|
394 |
|
|
#endif
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
// Unlock the scheduler and maybe switch threads
|
398 |
|
|
Cyg_Scheduler::unlock();
|
399 |
|
|
|
400 |
|
|
return result;
|
401 |
|
|
}
|
402 |
|
|
|
403 |
|
|
// -------------------------------------------------------------------------
|
404 |
|
|
// get next item without removing it
|
405 |
|
|
template
|
406 |
|
|
CYG_MBOXT_INLINE cyg_bool
|
407 |
|
|
Cyg_Mboxt::peek_item( T &ritem )
|
408 |
|
|
{
|
409 |
|
|
CYG_REPORT_FUNCTION();
|
410 |
|
|
|
411 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
412 |
|
|
|
413 |
|
|
// Prevent preemption
|
414 |
|
|
Cyg_Scheduler::lock();
|
415 |
|
|
|
416 |
|
|
CYG_INSTRUMENT_MBOXT(TRY, this, count);
|
417 |
|
|
|
418 |
|
|
cyg_bool result = ( 0 < count );
|
419 |
|
|
// If the mboxt is not empty, grab an item and return it.
|
420 |
|
|
if ( result )
|
421 |
|
|
ritem = itemqueue[ base ];
|
422 |
|
|
|
423 |
|
|
// Unlock the scheduler and maybe switch threads
|
424 |
|
|
Cyg_Scheduler::unlock();
|
425 |
|
|
|
426 |
|
|
return result;
|
427 |
|
|
}
|
428 |
|
|
|
429 |
|
|
// -------------------------------------------------------------------------
|
430 |
|
|
// Put an item in the queue; wait if full.
|
431 |
|
|
|
432 |
|
|
#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
|
433 |
|
|
template
|
434 |
|
|
CYG_MBOXT_INLINE cyg_bool
|
435 |
|
|
Cyg_Mboxt::put( const T item )
|
436 |
|
|
{
|
437 |
|
|
CYG_REPORT_FUNCTION();
|
438 |
|
|
cyg_bool result = true;
|
439 |
|
|
|
440 |
|
|
Cyg_Thread *self = Cyg_Thread::self();
|
441 |
|
|
|
442 |
|
|
// Prevent preemption
|
443 |
|
|
Cyg_Scheduler::lock();
|
444 |
|
|
|
445 |
|
|
CYG_INSTRUMENT_MBOXT(PUT, this, count);
|
446 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
447 |
|
|
|
448 |
|
|
while ( result && (size == count) ) {
|
449 |
|
|
self->set_sleep_reason( Cyg_Thread::WAIT );
|
450 |
|
|
self->sleep();
|
451 |
|
|
put_threadq.enqueue( self );
|
452 |
|
|
|
453 |
|
|
CYG_INSTRUMENT_MBOXT(WAIT, this, count);
|
454 |
|
|
|
455 |
|
|
// Allow other threads to run
|
456 |
|
|
Cyg_Scheduler::reschedule();
|
457 |
|
|
|
458 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
459 |
|
|
|
460 |
|
|
switch( self->get_wake_reason() )
|
461 |
|
|
{
|
462 |
|
|
case Cyg_Thread::DESTRUCT:
|
463 |
|
|
case Cyg_Thread::BREAK:
|
464 |
|
|
result = false;
|
465 |
|
|
break;
|
466 |
|
|
|
467 |
|
|
case Cyg_Thread::EXIT:
|
468 |
|
|
self->exit();
|
469 |
|
|
break;
|
470 |
|
|
|
471 |
|
|
default:
|
472 |
|
|
break;
|
473 |
|
|
}
|
474 |
|
|
}
|
475 |
|
|
|
476 |
|
|
if ( result ) {
|
477 |
|
|
cyg_count32 in = base + (count++);
|
478 |
|
|
if ( size <= in )
|
479 |
|
|
in -= size;
|
480 |
|
|
|
481 |
|
|
CYG_ASSERT( size > in, "in overflow" );
|
482 |
|
|
CYG_ASSERT( 0 <= in, "in overflow" );
|
483 |
|
|
CYG_ASSERT( size >= count, "count overflow" );
|
484 |
|
|
|
485 |
|
|
itemqueue[ in ] = item;
|
486 |
|
|
|
487 |
|
|
wakeup_waiter( get_threadq );
|
488 |
|
|
}
|
489 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
490 |
|
|
|
491 |
|
|
// Unlock the scheduler and maybe switch threads
|
492 |
|
|
Cyg_Scheduler::unlock();
|
493 |
|
|
CYG_REPORT_RETVAL( result );
|
494 |
|
|
return result;
|
495 |
|
|
}
|
496 |
|
|
|
497 |
|
|
// -------------------------------------------------------------------------
|
498 |
|
|
// Put an item in the queue; wait if full, with an absolute timeout;
|
499 |
|
|
// return success.
|
500 |
|
|
|
501 |
|
|
#ifdef CYGFUN_KERNEL_THREADS_TIMER
|
502 |
|
|
template
|
503 |
|
|
CYG_MBOXT_INLINE cyg_bool
|
504 |
|
|
Cyg_Mboxt::put( const T item, cyg_tick_count abs_timeout )
|
505 |
|
|
{
|
506 |
|
|
CYG_REPORT_FUNCTION();
|
507 |
|
|
cyg_bool result = true;
|
508 |
|
|
|
509 |
|
|
Cyg_Thread *self = Cyg_Thread::self();
|
510 |
|
|
|
511 |
|
|
// Prevent preemption
|
512 |
|
|
Cyg_Scheduler::lock();
|
513 |
|
|
|
514 |
|
|
CYG_INSTRUMENT_MBOXT(PUT, this, count);
|
515 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
516 |
|
|
|
517 |
|
|
// Set the timer _once_ outside the loop.
|
518 |
|
|
self->set_timer( abs_timeout, Cyg_Thread::TIMEOUT );
|
519 |
|
|
|
520 |
|
|
// If the timeout is in the past, the wake reason will have been
|
521 |
|
|
// set to something other than NONE already. Set the result false
|
522 |
|
|
// to force an immediate return.
|
523 |
|
|
|
524 |
|
|
if( self->get_wake_reason() != Cyg_Thread::NONE )
|
525 |
|
|
result = false;
|
526 |
|
|
|
527 |
|
|
// Loop while the mboxt is full, sleeping each time around the loop.
|
528 |
|
|
// This copes with the possibility of a higher priority thread filling
|
529 |
|
|
// the empty slot between the wakeup in get()&c and this thread
|
530 |
|
|
// actually starting.
|
531 |
|
|
while ( result && (size == count) ) {
|
532 |
|
|
// must reset the sleep reason every time
|
533 |
|
|
self->set_sleep_reason( Cyg_Thread::TIMEOUT );
|
534 |
|
|
self->sleep();
|
535 |
|
|
put_threadq.enqueue( self );
|
536 |
|
|
|
537 |
|
|
CYG_INSTRUMENT_MBOXT(WAIT, this, count);
|
538 |
|
|
|
539 |
|
|
// Allow other threads to run
|
540 |
|
|
Cyg_Scheduler::reschedule();
|
541 |
|
|
|
542 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
543 |
|
|
|
544 |
|
|
switch( self->get_wake_reason() )
|
545 |
|
|
{
|
546 |
|
|
case Cyg_Thread::TIMEOUT:
|
547 |
|
|
result = false;
|
548 |
|
|
CYG_INSTRUMENT_MBOXT(TIMEOUT, this, count);
|
549 |
|
|
break;
|
550 |
|
|
|
551 |
|
|
case Cyg_Thread::DESTRUCT:
|
552 |
|
|
case Cyg_Thread::BREAK:
|
553 |
|
|
result = false;
|
554 |
|
|
break;
|
555 |
|
|
|
556 |
|
|
case Cyg_Thread::EXIT:
|
557 |
|
|
self->exit();
|
558 |
|
|
break;
|
559 |
|
|
|
560 |
|
|
default:
|
561 |
|
|
break;
|
562 |
|
|
}
|
563 |
|
|
}
|
564 |
|
|
|
565 |
|
|
// clear the timer; if it actually fired, no worries.
|
566 |
|
|
self->clear_timer();
|
567 |
|
|
|
568 |
|
|
if ( result ) {
|
569 |
|
|
cyg_count32 in = base + (count++);
|
570 |
|
|
if ( size <= in )
|
571 |
|
|
in -= size;
|
572 |
|
|
|
573 |
|
|
CYG_ASSERT( size > in, "in overflow" );
|
574 |
|
|
CYG_ASSERT( 0 <= in, "in overflow" );
|
575 |
|
|
CYG_ASSERT( size >= count, "count overflow" );
|
576 |
|
|
|
577 |
|
|
itemqueue[ in ] = item;
|
578 |
|
|
|
579 |
|
|
wakeup_waiter( get_threadq );
|
580 |
|
|
}
|
581 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
582 |
|
|
|
583 |
|
|
// Unlock the scheduler and maybe switch threads
|
584 |
|
|
Cyg_Scheduler::unlock();
|
585 |
|
|
CYG_REPORT_RETVAL( result );
|
586 |
|
|
return result;
|
587 |
|
|
}
|
588 |
|
|
#endif // CYGFUN_KERNEL_THREADS_TIMER
|
589 |
|
|
#endif // CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
|
590 |
|
|
|
591 |
|
|
// -------------------------------------------------------------------------
|
592 |
|
|
// Try to put an item in the queue and return success; queue may be full.
|
593 |
|
|
|
594 |
|
|
template
|
595 |
|
|
CYG_MBOXT_INLINE cyg_bool
|
596 |
|
|
Cyg_Mboxt::tryput( const T item )
|
597 |
|
|
{
|
598 |
|
|
CYG_REPORT_FUNCTION();
|
599 |
|
|
|
600 |
|
|
// Prevent preemption
|
601 |
|
|
Cyg_Scheduler::lock();
|
602 |
|
|
|
603 |
|
|
CYG_INSTRUMENT_MBOXT(PUT, this, count);
|
604 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
605 |
|
|
|
606 |
|
|
if ( size == count ) {
|
607 |
|
|
Cyg_Scheduler::unlock(); // unlock, maybe switch threads
|
608 |
|
|
return false; // the mboxt is full
|
609 |
|
|
}
|
610 |
|
|
|
611 |
|
|
cyg_count32 in = base + (count++);
|
612 |
|
|
if ( size <= in )
|
613 |
|
|
in -= size;
|
614 |
|
|
|
615 |
|
|
CYG_ASSERT( size > in, "in overflow" );
|
616 |
|
|
CYG_ASSERT( 0 <= in, "in overflow" );
|
617 |
|
|
CYG_ASSERT( size >= count, "count overflow" );
|
618 |
|
|
|
619 |
|
|
itemqueue[ in ] = item;
|
620 |
|
|
|
621 |
|
|
CYG_ASSERTCLASS( this, "Bad this pointer");
|
622 |
|
|
|
623 |
|
|
wakeup_waiter( get_threadq );
|
624 |
|
|
|
625 |
|
|
// Unlock the scheduler and maybe switch threads
|
626 |
|
|
Cyg_Scheduler::unlock();
|
627 |
|
|
|
628 |
|
|
return true;
|
629 |
|
|
}
|
630 |
|
|
|
631 |
|
|
|
632 |
|
|
// -------------------------------------------------------------------------
|
633 |
|
|
#endif // ifndef CYGONCE_KERNEL_MBOXT_INL
|
634 |
|
|
// EOF mboxt.inl
|