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lammps/lib/kokkos/core/src/impl/KokkosExp_SharedAlloc.cpp
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KokkosExp_SharedAlloc.cpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#include <Kokkos_Core.hpp>
namespace Kokkos {
namespace Experimental {
namespace Impl {
bool
SharedAllocationRecord< void , void >::
is_sane( SharedAllocationRecord< void , void > * arg_record )
{
constexpr static SharedAllocationRecord * zero = 0 ;
SharedAllocationRecord * const root = arg_record ? arg_record->m_root : 0 ;
bool ok = root != 0 && root->m_count == 0 ;
if ( ok ) {
SharedAllocationRecord * root_next = 0 ;
// Lock the list:
while ( ( root_next = Kokkos::atomic_exchange( & root->m_next , zero ) ) == 0 );
for ( SharedAllocationRecord * rec = root_next ; ok && rec != root ; rec = rec->m_next ) {
const bool ok_non_null = rec && rec->m_prev && ( rec == root || rec->m_next );
const bool ok_root = ok_non_null && rec->m_root == root ;
const bool ok_prev_next = ok_non_null && ( rec->m_prev != root ? rec->m_prev->m_next == rec : root_next == rec );
const bool ok_next_prev = ok_non_null && rec->m_next->m_prev == rec ;
const bool ok_count = ok_non_null && 0 <= rec->m_count ;
ok = ok_root && ok_prev_next && ok_next_prev && ok_count ;
if ( ! ok ) {
fprintf(stderr,"Kokkos::Experimental::Impl::SharedAllocationRecord failed is_sane: rec(0x%.12lx){ m_count(%d) m_root(0x%.12lx) m_next(0x%.12lx) m_prev(0x%.12lx) m_next->m_prev(0x%.12lx) m_prev->m_next(0x%.12lx) }\n"
, reinterpret_cast< unsigned long >( rec )
, rec->m_count
, reinterpret_cast< unsigned long >( rec->m_root )
, reinterpret_cast< unsigned long >( rec->m_next )
, reinterpret_cast< unsigned long >( rec->m_prev )
, reinterpret_cast< unsigned long >( rec->m_next->m_prev )
, reinterpret_cast< unsigned long >( rec->m_prev != rec->m_root ? rec->m_prev->m_next : root_next )
);
}
}
if ( zero != Kokkos::atomic_exchange( & root->m_next , root_next ) ) {
Kokkos::Impl::throw_runtime_exception("Kokkos::Experimental::Impl::SharedAllocationRecord failed is_sane unlocking");
}
}
return ok ;
}
SharedAllocationRecord<void,void> *
SharedAllocationRecord<void,void>::find( SharedAllocationRecord<void,void> * const arg_root , void * const arg_data_ptr )
{
constexpr static SharedAllocationRecord * zero = 0 ;
SharedAllocationRecord * root_next = 0 ;
// Lock the list:
while ( ( root_next = Kokkos::atomic_exchange( & arg_root->m_next , 0 ) ) == 0 );
// Iterate searching for the record with this data pointer
SharedAllocationRecord * r = root_next ;
while ( ( r != arg_root ) && ( r->data() != arg_data_ptr ) ) { r = r->m_next ; }
if ( r == arg_root ) { r = 0 ; }
if ( zero != Kokkos::atomic_exchange( & arg_root->m_next , root_next ) ) {
Kokkos::Impl::throw_runtime_exception("Kokkos::Experimental::Impl::SharedAllocationRecord failed locking/unlocking");
}
return r ;
}
/**\brief Construct and insert into 'arg_root' tracking set.
* use_count is zero.
*/
SharedAllocationRecord< void , void >::
SharedAllocationRecord( SharedAllocationRecord<void,void> * arg_root
, SharedAllocationHeader * arg_alloc_ptr
, size_t arg_alloc_size
, SharedAllocationRecord< void , void >::function_type arg_dealloc
)
: m_alloc_ptr( arg_alloc_ptr )
, m_alloc_size( arg_alloc_size )
, m_dealloc( arg_dealloc )
, m_root( arg_root )
, m_prev( 0 )
, m_next( 0 )
, m_count( 0 )
{
constexpr static SharedAllocationRecord * zero = 0 ;
// Insert into the root double-linked list for tracking
//
// before: arg_root->m_next == next ; next->m_prev == arg_root
// after: arg_root->m_next == this ; this->m_prev == arg_root ;
// this->m_next == next ; next->m_prev == this
m_prev = m_root ;
// Read root->m_next and lock by setting to zero
while ( ( m_next = Kokkos::atomic_exchange( & m_root->m_next , zero ) ) == 0 );
m_next->m_prev = this ;
if ( zero != Kokkos::atomic_exchange( & m_root->m_next , this ) ) {
Kokkos::Impl::throw_runtime_exception("Kokkos::Experimental::Impl::SharedAllocationRecord failed locking/unlocking");
}
}
void
SharedAllocationRecord< void , void >::
increment( SharedAllocationRecord< void , void > * arg_record )
{
const int old_count = Kokkos::atomic_fetch_add( & arg_record->m_count , 1 );
if ( old_count < 0 ) { // Error
Kokkos::Impl::throw_runtime_exception("Kokkos::Experimental::Impl::SharedAllocationRecord failed increment");
}
}
SharedAllocationRecord< void , void > *
SharedAllocationRecord< void , void >::
decrement( SharedAllocationRecord< void , void > * arg_record )
{
constexpr static SharedAllocationRecord * zero = 0 ;
const int old_count = Kokkos::atomic_fetch_add( & arg_record->m_count , -1 );
if ( old_count == 1 ) {
// before: arg_record->m_prev->m_next == arg_record &&
// arg_record->m_next->m_prev == arg_record
//
// after: arg_record->m_prev->m_next == arg_record->m_next &&
// arg_record->m_next->m_prev == arg_record->m_prev
SharedAllocationRecord * root_next = 0 ;
// Lock the list:
while ( ( root_next = Kokkos::atomic_exchange( & arg_record->m_root->m_next , 0 ) ) == 0 );
arg_record->m_next->m_prev = arg_record->m_prev ;
if ( root_next != arg_record ) {
arg_record->m_prev->m_next = arg_record->m_next ;
}
else {
// before: arg_record->m_root == arg_record->m_prev
// after: arg_record->m_root == arg_record->m_next
root_next = arg_record->m_next ;
}
// Unlock the list:
if ( zero != Kokkos::atomic_exchange( & arg_record->m_root->m_next , root_next ) ) {
Kokkos::Impl::throw_runtime_exception("Kokkos::Experimental::Impl::SharedAllocationRecord failed decrement unlocking");
}
arg_record->m_next = 0 ;
arg_record->m_prev = 0 ;
function_type d = arg_record->m_dealloc ;
(*d)( arg_record );
arg_record = 0 ;
}
else if ( old_count < 1 ) { // Error
Kokkos::Impl::throw_runtime_exception("Kokkos::Experimental::Impl::SharedAllocationRecord failed decrement count");
}
return arg_record ;
}
void
SharedAllocationRecord< void , void >::
print_host_accessible_records( std::ostream & s
, const char * const space_name
, const SharedAllocationRecord * const root
, const bool detail )
{
const SharedAllocationRecord< void , void > * r = root ;
char buffer[256] ;
if ( detail ) {
do {
snprintf( buffer , 256 , "%s addr( 0x%.12lx ) list( 0x%.12lx 0x%.12lx ) extent[ 0x%.12lx + %.8ld ] count(%d) dealloc(0x%.12lx) %s\n"
, space_name
, reinterpret_cast<unsigned long>( r )
, reinterpret_cast<unsigned long>( r->m_prev )
, reinterpret_cast<unsigned long>( r->m_next )
, reinterpret_cast<unsigned long>( r->m_alloc_ptr )
, r->m_alloc_size
, r->m_count
, reinterpret_cast<unsigned long>( r->m_dealloc )
, r->m_alloc_ptr->m_label
);
std::cout << buffer ;
r = r->m_next ;
} while ( r != root );
}
else {
do {
if ( r->m_alloc_ptr ) {
snprintf( buffer , 256 , "%s [ 0x%.12lx + %ld ] %s\n"
, space_name
, reinterpret_cast< unsigned long >( r->data() )
, r->size()
, r->m_alloc_ptr->m_label
);
}
else {
snprintf( buffer , 256 , "%s [ 0 + 0 ]\n" , space_name );
}
std::cout << buffer ;
r = r->m_next ;
} while ( r != root );
}
}
} /* namespace Impl */
} /* namespace Experimental */
} /* namespace Kokkos */
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