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#ifndef CYGONCE_KERNEL_MEMPOOLT_INL

#define CYGONCE_KERNEL_MEMPOOLT_INL

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

//

//      mempoolt.inl

//

//      Mempoolt (Memory pool template) class declarations

//

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

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

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// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):   hmt

// Contributors:        hmt

// Date:        1998-02-10

// Purpose:     Define Mempoolt class interface

// Description: The class defined here provides the APIs for thread-safe,

//              kernel-savvy memory managers; make a class with the

//              underlying allocator as the template parameter.

// Usage:       #include 

//

//

//####DESCRIPTIONEND####

//

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

#include   // implementation eg. Cyg_Thread::self();

#include    // implementation eg. Cyg_Scheduler::lock();

// -------------------------------------------------------------------------

// Constructor; we _require_ these arguments and just pass them through to

// the implementation memory pool in use.

template 

Cyg_Mempoolt::Cyg_Mempoolt(

    cyg_uint8 *base,

    cyg_int32 size,

    CYG_ADDRWORD arg_thru)              // Constructor

    : pool( base, size, arg_thru )

{

}

template 

Cyg_Mempoolt::~Cyg_Mempoolt()  // destructor

{

    // Prevent preemption

    Cyg_Scheduler::lock();

    while ( ! queue.empty() ) {

        Cyg_Thread *thread = queue.dequeue();

        thread->set_wake_reason( Cyg_Thread::DESTRUCT );

        thread->wake();

    }

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

}

// -------------------------------------------------------------------------

// get some memory; wait if none available

template 

inline cyg_uint8 *

Cyg_Mempoolt::alloc( cyg_int32 size )

{

    CYG_REPORT_FUNCTION();

    Cyg_Thread *self = Cyg_Thread::self();

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    // Loop while we got no memory, sleeping each time around the

    // loop. This copes with the possibility of a higher priority thread

    // grabbing the freed storage between the wakeup in free() and this

    // thread actually starting.

    cyg_uint8 *ret;

    cyg_bool result = true;

    while( result && (NULL == (ret = pool.alloc( size ))) ) {

        self->set_sleep_reason( Cyg_Thread::WAIT );

        self->sleep();

        queue.enqueue( self );

        CYG_ASSERT( 1 == Cyg_Scheduler::get_sched_lock(),

                    "Called with non-zero scheduler lock");

        // Unlock scheduler and allow other threads to run

        Cyg_Scheduler::unlock();

        Cyg_Scheduler::lock();

        CYG_ASSERTCLASS( this, "Bad this pointer");

        switch( self->get_wake_reason() )

        {

        case Cyg_Thread::DESTRUCT:

        case Cyg_Thread::BREAK:

            result = false;

            break;

        case Cyg_Thread::EXIT:

            self->exit();

            break;

        default:

            break;

        }

    }

    CYG_ASSERTCLASS( this, "Bad this pointer");

    if ( ! result )

        ret = NULL;

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    CYG_REPORT_RETVAL( ret );

    return ret;

}

#ifdef CYGFUN_KERNEL_THREADS_TIMER

// -------------------------------------------------------------------------

// get some memory with a timeout

template 

inline cyg_uint8 *

Cyg_Mempoolt::alloc( cyg_int32 size, cyg_tick_count abs_timeout )

{

    CYG_REPORT_FUNCTION();

    Cyg_Thread *self = Cyg_Thread::self();

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    // Loop while we got no memory, sleeping each time around the

    // loop. This copes with the possibility of a higher priority thread

    // grabbing the freed storage between the wakeup in free() and this

    // thread actually starting.

    cyg_uint8 *ret;

    cyg_bool result = true;

    // Set the timer _once_ outside the loop.

    self->set_timer( abs_timeout, Cyg_Thread::TIMEOUT );

    // If the timeout is in the past, the wake reason will have been

    // set to something other than NONE already. Set the result false

    // to force an immediate return.

    if( self->get_wake_reason() != Cyg_Thread::NONE )

        result = false;

    while( result && (NULL == (ret = pool.alloc( size ))) ) {

        self->set_sleep_reason( Cyg_Thread::TIMEOUT );

        self->sleep();

        queue.enqueue( self );

        CYG_ASSERT( 1 == Cyg_Scheduler::get_sched_lock(),

                    "Called with non-zero scheduler lock");

        // Unlock scheduler and allow other threads to run

        Cyg_Scheduler::unlock();

        Cyg_Scheduler::lock();

        CYG_ASSERTCLASS( this, "Bad this pointer");

        switch( self->get_wake_reason() )

        {

        case Cyg_Thread::TIMEOUT:

            result = false;

            break;

        case Cyg_Thread::DESTRUCT:

        case Cyg_Thread::BREAK:

            result = false;

            break;

        case Cyg_Thread::EXIT:

            self->exit();

            break;

        default:

            break;

        }

    }

    CYG_ASSERTCLASS( this, "Bad this pointer");

    if ( ! result )

        ret = NULL;

    // clear the timer; if it actually fired, no worries.

    self->clear_timer();

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    CYG_REPORT_RETVAL( ret );

    return ret;

}

#endif

// -------------------------------------------------------------------------

// get some memory, return NULL if none available

template 

inline cyg_uint8 *

Cyg_Mempoolt::try_alloc( cyg_int32 size )

{

    CYG_REPORT_FUNCTION();

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    cyg_uint8 *ret = pool.alloc( size );

    CYG_ASSERTCLASS( this, "Bad this pointer");

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    CYG_REPORT_RETVAL( ret );

    return ret;

}

// -------------------------------------------------------------------------

// free the memory back to the pool

template 

cyg_bool

Cyg_Mempoolt::free( cyg_uint8 *p, cyg_int32 size )

{

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    cyg_int32 ret = pool.free( p, size );

    CYG_ASSERTCLASS( this, "Bad this pointer");

    while ( ret && !queue.empty() ) {

        // we succeeded and there are people waiting

        Cyg_Thread *thread = queue.dequeue();

        CYG_ASSERTCLASS( thread, "Bad thread pointer");

        // we wake them all up (ie. broadcast) to cope with variable block

        // allocators freeing a big block when lots of small allocs wait.

        thread->set_wake_reason( Cyg_Thread::DONE );

        thread->wake();

        // we cannot yield here; if a higher prio thread can't satisfy its

        // request it would re-queue and we would loop forever

    }

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    return ret;

}

// -------------------------------------------------------------------------

// if applicable: return -1 if not fixed size

template 

inline cyg_int32

Cyg_Mempoolt::get_blocksize()

{

    // there should not be any atomicity issues here

    return pool.get_blocksize();

}

// -------------------------------------------------------------------------

// these two are obvious and generic, but need atomicity protection (maybe)

template 

inline cyg_int32

Cyg_Mempoolt::get_totalmem()

{

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    cyg_int32 ret = pool.get_totalmem();

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    return ret;

}

template 

inline cyg_int32

Cyg_Mempoolt::get_freemem()

{

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    cyg_int32 ret = pool.get_freemem();

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    return ret;

}

// -------------------------------------------------------------------------

// get information about the construction parameters for external

// freeing after the destruction of the holding object

template 

inline void

Cyg_Mempoolt::get_arena(

    cyg_uint8 * &base, cyg_int32 &size, CYG_ADDRWORD &arg_thru )

{

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    pool.get_arena( base, size, arg_thru );

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

}

// -------------------------------------------------------------------------

// Return the size of the memory allocation (previously returned

// by alloc() or try_alloc() ) at ptr. Returns -1 if not found

template 

cyg_int32

Cyg_Mempoolt::get_allocation_size( cyg_uint8 *ptr )

{

    cyg_int32 ret;

    // Prevent preemption

    Cyg_Scheduler::lock();

    CYG_ASSERTCLASS( this, "Bad this pointer");

    ret = pool.get_allocation_size( ptr );

    // Unlock the scheduler and maybe switch threads

    Cyg_Scheduler::unlock();

    return ret;

}

// -------------------------------------------------------------------------

// debugging/assert function

#ifdef CYGDBG_USE_ASSERTS

template 

inline cyg_bool

Cyg_Mempoolt::check_this(cyg_assert_class_zeal zeal) const

{

    CYG_REPORT_FUNCTION();

    if ( Cyg_Thread::DESTRUCT == Cyg_Thread::self()->get_wake_reason() )

        // then the whole thing is invalid, and we know it.

        // so return OK, since this check should NOT make an error.

        return true;

    // check that we have a non-NULL pointer first

    if( this == NULL ) return false;

    return true;

}

#endif

// -------------------------------------------------------------------------

#endif // ifndef CYGONCE_KERNEL_MEMPOOLT_INL

// EOF mempoolt.inl