1 /* smpi_datatype.cpp -- MPI primitives to handle datatypes */
2 /* Copyright (c) 2009-2021. The SimGrid Team. All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "simgrid/modelchecker.h"
9 #include "smpi_datatype_derived.hpp"
10 #include "smpi_op.hpp"
11 #include "src/instr/instr_private.hpp"
12 #include "src/smpi/include/smpi_actor.hpp"
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_datatype, smpi, "Logging specific to SMPI (datatype)");
21 static std::unordered_map<std::string, simgrid::smpi::Datatype*> id2type_lookup;
23 #define CREATE_MPI_DATATYPE(name, id, type) \
24 static simgrid::smpi::Datatype _XBT_CONCAT(mpi_, name)((char*)_XBT_STRINGIFY(name), (id), sizeof(type), /* size */ \
26 sizeof(type), /* ub = lb + size */ \
27 DT_FLAG_BASIC /* flags */ \
29 const MPI_Datatype name = &_XBT_CONCAT(mpi_, name);
31 #define CREATE_MPI_DATATYPE_NULL(name, id) \
32 static simgrid::smpi::Datatype _XBT_CONCAT(mpi_, name)((char*)_XBT_STRINGIFY(name), (id), 0, /* size */ \
34 0, /* ub = lb + size */ \
35 DT_FLAG_BASIC /* flags */ \
37 const MPI_Datatype name = &_XBT_CONCAT(mpi_, name);
39 // Predefined data types
40 CREATE_MPI_DATATYPE(MPI_CHAR, 2, char)
41 CREATE_MPI_DATATYPE(MPI_SHORT, 3, short)
42 CREATE_MPI_DATATYPE(MPI_INT, 1, int)
43 CREATE_MPI_DATATYPE(MPI_LONG, 4, long)
44 CREATE_MPI_DATATYPE(MPI_LONG_LONG, 7, long long)
45 CREATE_MPI_DATATYPE(MPI_SIGNED_CHAR, 8, signed char)
46 CREATE_MPI_DATATYPE(MPI_UNSIGNED_CHAR, 9, unsigned char)
47 CREATE_MPI_DATATYPE(MPI_UNSIGNED_SHORT, 10, unsigned short)
48 CREATE_MPI_DATATYPE(MPI_UNSIGNED, 11, unsigned int)
49 CREATE_MPI_DATATYPE(MPI_UNSIGNED_LONG, 12, unsigned long)
50 CREATE_MPI_DATATYPE(MPI_UNSIGNED_LONG_LONG, 13, unsigned long long)
51 CREATE_MPI_DATATYPE(MPI_FLOAT, 5, float)
52 CREATE_MPI_DATATYPE(MPI_DOUBLE, 0, double)
53 CREATE_MPI_DATATYPE(MPI_LONG_DOUBLE, 14, long double)
54 CREATE_MPI_DATATYPE(MPI_WCHAR, 15, wchar_t)
55 CREATE_MPI_DATATYPE(MPI_C_BOOL, 16, bool)
56 CREATE_MPI_DATATYPE(MPI_BYTE, 6, int8_t)
57 CREATE_MPI_DATATYPE(MPI_INT8_T, 17, int8_t)
58 CREATE_MPI_DATATYPE(MPI_INT16_T, 18, int16_t)
59 CREATE_MPI_DATATYPE(MPI_INT32_T, 19, int32_t)
60 CREATE_MPI_DATATYPE(MPI_INT64_T, 20, int64_t)
61 CREATE_MPI_DATATYPE(MPI_UINT8_T, 21, uint8_t)
62 CREATE_MPI_DATATYPE(MPI_UINT16_T, 22, uint16_t)
63 CREATE_MPI_DATATYPE(MPI_UINT32_T, 23, uint32_t)
64 CREATE_MPI_DATATYPE(MPI_UINT64_T, 24, uint64_t)
65 CREATE_MPI_DATATYPE(MPI_C_FLOAT_COMPLEX, 25, float _Complex)
66 CREATE_MPI_DATATYPE(MPI_C_DOUBLE_COMPLEX, 26, double _Complex)
67 CREATE_MPI_DATATYPE(MPI_C_LONG_DOUBLE_COMPLEX, 27, long double _Complex)
68 CREATE_MPI_DATATYPE(MPI_AINT, 28, MPI_Aint)
69 CREATE_MPI_DATATYPE(MPI_OFFSET, 29, MPI_Offset)
71 CREATE_MPI_DATATYPE(MPI_FLOAT_INT, 30, float_int)
72 CREATE_MPI_DATATYPE(MPI_LONG_INT, 31, long_int)
73 CREATE_MPI_DATATYPE(MPI_DOUBLE_INT, 32, double_int)
74 CREATE_MPI_DATATYPE(MPI_SHORT_INT, 33, short_int)
75 CREATE_MPI_DATATYPE(MPI_2INT, 34, int_int)
76 CREATE_MPI_DATATYPE(MPI_2FLOAT, 35, float_float)
77 CREATE_MPI_DATATYPE(MPI_2DOUBLE, 36, double_double)
78 CREATE_MPI_DATATYPE(MPI_2LONG, 37, long_long)
80 CREATE_MPI_DATATYPE(MPI_REAL, 38, float)
81 CREATE_MPI_DATATYPE(MPI_REAL4, 39, float)
82 CREATE_MPI_DATATYPE(MPI_REAL8, 40, double)
83 CREATE_MPI_DATATYPE(MPI_REAL16, 41, long double)
84 CREATE_MPI_DATATYPE_NULL(MPI_DATATYPE_NULL, -1)
85 CREATE_MPI_DATATYPE(MPI_COMPLEX8, 42, float_float)
86 CREATE_MPI_DATATYPE(MPI_COMPLEX16, 43, double_double)
87 CREATE_MPI_DATATYPE(MPI_COMPLEX32, 44, double_double)
88 CREATE_MPI_DATATYPE(MPI_INTEGER1, 45, int)
89 CREATE_MPI_DATATYPE(MPI_INTEGER2, 46, int16_t)
90 CREATE_MPI_DATATYPE(MPI_INTEGER4, 47, int32_t)
91 CREATE_MPI_DATATYPE(MPI_INTEGER8, 48, int64_t)
92 CREATE_MPI_DATATYPE(MPI_INTEGER16, 49, integer128_t)
94 CREATE_MPI_DATATYPE(MPI_LONG_DOUBLE_INT, 50, long_double_int)
96 CREATE_MPI_DATATYPE_NULL(MPI_UB, 51)
97 CREATE_MPI_DATATYPE_NULL(MPI_LB, 52)
98 CREATE_MPI_DATATYPE(MPI_PACKED, 53, char)
100 CREATE_MPI_DATATYPE(MPI_PTR, 54, void*)
101 CREATE_MPI_DATATYPE(MPI_COUNT, 55, long long)
107 std::unordered_map<int, smpi_key_elem> Datatype::keyvals_; // required by the Keyval class implementation
108 int Datatype::keyval_id_=0; // required by the Keyval class implementation
109 Datatype::Datatype(int ident, int size, MPI_Aint lb, MPI_Aint ub, int flags) : Datatype(size, lb, ub, flags)
111 id = std::to_string(ident);
114 Datatype::Datatype(int size, MPI_Aint lb, MPI_Aint ub, int flags) : size_(size), lb_(lb), ub_(ub), flags_(flags)
118 MC_ignore(&(refcount_), sizeof(refcount_));
122 // for predefined types, so refcount_ = 0.
123 Datatype::Datatype(const char* name, int ident, int size, MPI_Aint lb, MPI_Aint ub, int flags)
124 : name_(name), id(std::to_string(ident)), size_(size), lb_(lb), ub_(ub), flags_(flags), refcount_(0)
126 id2type_lookup.insert({id, this});
129 MC_ignore(&(refcount_), sizeof(refcount_));
133 Datatype::Datatype(Datatype* datatype, int* ret)
134 : size_(datatype->size_), lb_(datatype->lb_), ub_(datatype->ub_), flags_(datatype->flags_)
136 *ret = this->copy_attrs(datatype);
139 Datatype::~Datatype()
141 xbt_assert(refcount_ >= 0);
143 if(flags_ & DT_FLAG_PREDEFINED)
145 //prevent further usage
146 flags_ &= ~ DT_FLAG_COMMITED;
147 //if still used, mark for deletion
149 flags_ |=DT_FLAG_DESTROYED;
153 cleanup_attr<Datatype>();
157 int Datatype::copy_attrs(Datatype* datatype){
158 flags_ &= ~DT_FLAG_PREDEFINED;
159 int ret = MPI_SUCCESS;
161 if (not datatype->attributes()->empty()) {
164 for (auto const& it : *(datatype->attributes())) {
165 smpi_key_elem elem = keyvals_.at(it.first);
166 if (elem != nullptr){
167 if( elem->copy_fn.type_copy_fn != MPI_NULL_COPY_FN &&
168 elem->copy_fn.type_copy_fn != MPI_TYPE_DUP_FN)
169 ret = elem->copy_fn.type_copy_fn(datatype, it.first, elem->extra_state, it.second, &value_out, &flag);
170 else if ( elem->copy_fn.type_copy_fn_fort != MPI_NULL_COPY_FN &&
171 (*(int*)*elem->copy_fn.type_copy_fn_fort) != 1){
172 value_out=(int*)xbt_malloc(sizeof(int));
173 elem->copy_fn.type_copy_fn_fort(datatype, it.first, elem->extra_state, it.second, value_out, &flag, &ret);
175 if (ret != MPI_SUCCESS) {
178 if(elem->copy_fn.type_copy_fn == MPI_TYPE_DUP_FN ||
179 ((elem->copy_fn.type_copy_fn_fort != MPI_NULL_COPY_FN) && (*(int*)*elem->copy_fn.type_copy_fn_fort == 1))){
181 attributes()->insert({it.first, it.second});
184 attributes()->insert({it.first, value_out});
190 contents_ = new Datatype_contents(MPI_COMBINER_DUP, 0, nullptr, 0, nullptr, 1, &datatype);
194 int Datatype::clone(MPI_Datatype* type){
196 *type = new Datatype(this, &ret);
206 MC_ignore(&(refcount_), sizeof(refcount_));
210 void Datatype::unref(MPI_Datatype datatype)
212 if (datatype->refcount_ > 0)
213 datatype->refcount_--;
217 MC_ignore(&(datatype->refcount_), sizeof(datatype->refcount_));
220 if (datatype->refcount_ == 0 && not(datatype->flags_ & DT_FLAG_PREDEFINED))
224 void Datatype::commit()
226 flags_ |= DT_FLAG_COMMITED;
229 bool Datatype::is_valid() const
231 return (flags_ & DT_FLAG_COMMITED);
234 bool Datatype::is_basic() const
236 return (flags_ & DT_FLAG_BASIC);
239 bool Datatype::is_replayable() const
241 return (simgrid::instr::trace_format == simgrid::instr::TraceFormat::Ti) &&
242 ((this == MPI_BYTE) || (this == MPI_DOUBLE) || (this == MPI_INT) || (this == MPI_CHAR) ||
243 (this == MPI_SHORT) || (this == MPI_LONG) || (this == MPI_FLOAT));
246 MPI_Datatype Datatype::decode(const std::string& datatype_id)
248 return id2type_lookup.find(datatype_id)->second;
251 void Datatype::addflag(int flag){
255 int Datatype::extent(MPI_Aint* lb, MPI_Aint* extent) const
262 void Datatype::get_name(char* name, int* length) const
264 *length = static_cast<int>(name_.length());
265 if (not name_.empty()) {
266 name_.copy(name, *length);
267 name[*length] = '\0';
271 void Datatype::set_name(const char* name)
276 int Datatype::pack(const void* inbuf, int incount, void* outbuf, int outcount, int* position, const Comm*)
278 if (outcount - *position < incount*static_cast<int>(size_))
279 return MPI_ERR_OTHER;
280 Datatype::copy(inbuf, incount, this, static_cast<char*>(outbuf) + *position, outcount, MPI_CHAR);
281 *position += incount * size_;
285 int Datatype::unpack(const void* inbuf, int insize, int* position, void* outbuf, int outcount, const Comm*)
287 if (outcount*static_cast<int>(size_)> insize)
288 return MPI_ERR_OTHER;
289 Datatype::copy(static_cast<const char*>(inbuf) + *position, insize, MPI_CHAR, outbuf, outcount, this);
290 *position += outcount * size_;
294 int Datatype::get_contents(int max_integers, int max_addresses, int max_datatypes, int* array_of_integers,
295 MPI_Aint* array_of_addresses, MPI_Datatype* array_of_datatypes) const
297 if(contents_==nullptr)
299 if (static_cast<unsigned>(max_integers) < contents_->integers_.size())
300 return MPI_ERR_COUNT;
301 std::copy(begin(contents_->integers_), end(contents_->integers_), array_of_integers);
302 if (static_cast<unsigned>(max_addresses) < contents_->addresses_.size())
303 return MPI_ERR_COUNT;
304 std::copy(begin(contents_->addresses_), end(contents_->addresses_), array_of_addresses);
305 if (static_cast<unsigned>(max_datatypes) < contents_->datatypes_.size())
306 return MPI_ERR_COUNT;
307 std::copy(begin(contents_->datatypes_), end(contents_->datatypes_), array_of_datatypes);
308 std::for_each(begin(contents_->datatypes_), end(contents_->datatypes_), std::mem_fn(&Datatype::ref));
312 int Datatype::get_envelope(int* num_integers, int* num_addresses, int* num_datatypes, int* combiner) const
314 if(contents_==nullptr){
318 *combiner = MPI_COMBINER_NAMED;
320 *num_integers = contents_->integers_.size();
321 *num_addresses = contents_->addresses_.size();
322 *num_datatypes = contents_->datatypes_.size();
323 *combiner = contents_->combiner_;
328 int Datatype::copy(const void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, int recvcount,
329 MPI_Datatype recvtype)
331 // FIXME Handle the case of a partial shared malloc.
333 if (smpi_cfg_privatization() == SmpiPrivStrategies::MMAP) {
334 smpi_switch_data_segment(simgrid::s4u::Actor::self());
336 /* First check if we really have something to do */
338 std::vector<std::pair<size_t, size_t>> private_blocks;
339 if(smpi_is_shared(sendbuf,private_blocks,&offset)
340 && (private_blocks.size()==1
341 && (private_blocks[0].second - private_blocks[0].first)==(unsigned long)(sendcount * sendtype->get_extent()))){
342 XBT_VERB("sendbuf is shared. Ignoring copies");
345 if(smpi_is_shared(recvbuf,private_blocks,&offset)
346 && (private_blocks.size()==1
347 && (private_blocks[0].second - private_blocks[0].first)==(unsigned long)(recvcount * recvtype->get_extent()))){
348 XBT_VERB("recvbuf is shared. Ignoring copies");
352 if (recvcount > 0 && recvbuf != sendbuf) {
353 sendcount *= sendtype->size();
354 recvcount *= recvtype->size();
355 int count = sendcount < recvcount ? sendcount : recvcount;
356 XBT_DEBUG("Copying %d bytes from %p to %p", count, sendbuf, recvbuf);
357 if (not(sendtype->flags() & DT_FLAG_DERIVED) && not(recvtype->flags() & DT_FLAG_DERIVED)) {
358 if (not smpi_process()->replaying() && count > 0)
359 memcpy(recvbuf, sendbuf, count);
360 } else if (not(sendtype->flags() & DT_FLAG_DERIVED)) {
361 recvtype->unserialize(sendbuf, recvbuf, count / recvtype->size(), MPI_REPLACE);
362 } else if (not(recvtype->flags() & DT_FLAG_DERIVED)) {
363 sendtype->serialize(sendbuf, recvbuf, count / sendtype->size());
365 void * buf_tmp = xbt_malloc(count);
367 sendtype->serialize( sendbuf, buf_tmp,count/sendtype->size());
368 recvtype->unserialize( buf_tmp, recvbuf,count/recvtype->size(), MPI_REPLACE);
374 return sendcount > recvcount ? MPI_ERR_TRUNCATE : MPI_SUCCESS;
377 //Default serialization method : memcpy.
378 void Datatype::serialize(const void* noncontiguous_buf, void* contiguous_buf, int count)
380 auto* contiguous_buf_char = static_cast<char*>(contiguous_buf);
381 const auto* noncontiguous_buf_char = static_cast<const char*>(noncontiguous_buf) + lb_;
382 memcpy(contiguous_buf_char, noncontiguous_buf_char, count*size_);
385 void Datatype::unserialize(const void* contiguous_buf, void *noncontiguous_buf, int count, MPI_Op op){
386 const auto* contiguous_buf_char = static_cast<const char*>(contiguous_buf);
387 auto* noncontiguous_buf_char = static_cast<char*>(noncontiguous_buf) + lb_;
390 op->apply( contiguous_buf_char, noncontiguous_buf_char, &n, this);
393 int Datatype::create_contiguous(int count, MPI_Datatype old_type, MPI_Aint lb, MPI_Datatype* new_type){
394 if(old_type->flags_ & DT_FLAG_DERIVED){
395 //handle this case as a hvector with stride equals to the extent of the datatype
396 return create_hvector(count, 1, old_type->get_extent(), old_type, new_type);
399 *new_type = new Type_Contiguous(count * old_type->size(), lb, lb + count * old_type->size(),
400 DT_FLAG_DERIVED, count, old_type);
402 *new_type = new Datatype(count * old_type->size(), lb, lb + count * old_type->size(),0);
406 int Datatype::create_vector(int count, int block_length, int stride, MPI_Datatype old_type, MPI_Datatype* new_type)
415 ub=((count-1)*stride+block_length-1)*old_type->get_extent()+old_type->ub();
417 if(old_type->flags() & DT_FLAG_DERIVED || stride != block_length){
418 *new_type = new Type_Vector(count * (block_length) * old_type->size(), lb, ub,
419 DT_FLAG_DERIVED, count, block_length, stride, old_type);
422 /* in this situation the data are contiguous thus it's not required to serialize and unserialize it*/
423 *new_type = new Datatype(count * block_length * old_type->size(), 0, ((count -1) * stride + block_length)*
424 old_type->size(), DT_FLAG_CONTIGUOUS);
425 const std::array<int, 3> ints = {{count, block_length, stride}};
426 (*new_type)->contents_ = new Datatype_contents(MPI_COMBINER_VECTOR, 3, ints.data(), 0, nullptr, 1, &old_type);
433 int Datatype::create_hvector(int count, int block_length, MPI_Aint stride, MPI_Datatype old_type, MPI_Datatype* new_type)
442 ub=((count-1)*stride)+(block_length-1)*old_type->get_extent()+old_type->ub();
444 if(old_type->flags() & DT_FLAG_DERIVED || stride != block_length*old_type->get_extent()){
445 *new_type = new Type_Hvector(count * (block_length) * old_type->size(), lb, ub,
446 DT_FLAG_DERIVED, count, block_length, stride, old_type);
449 /* in this situation the data are contiguous thus it's not required to serialize and unserialize it*/
450 *new_type = new Datatype(count * block_length * old_type->size(), 0, count * block_length * old_type->size(), DT_FLAG_CONTIGUOUS);
451 const std::array<int, 2> ints = {{count, block_length}};
452 (*new_type)->contents_ = new Datatype_contents(MPI_COMBINER_HVECTOR, 2, ints.data(), 1, &stride, 1, &old_type);
458 int Datatype::create_indexed(int count, const int* block_lengths, const int* indices, MPI_Datatype old_type, MPI_Datatype* new_type){
460 bool contiguous=true;
464 lb=indices[0]*old_type->get_extent();
465 ub=indices[0]*old_type->get_extent() + block_lengths[0]*old_type->ub();
468 for (int i = 0; i < count; i++) {
469 if (block_lengths[i] < 0)
471 size += block_lengths[i];
473 if(indices[i]*old_type->get_extent()+old_type->lb()<lb)
474 lb = indices[i]*old_type->get_extent()+old_type->lb();
475 if(indices[i]*old_type->get_extent()+block_lengths[i]*old_type->ub()>ub)
476 ub = indices[i]*old_type->get_extent()+block_lengths[i]*old_type->ub();
478 if ( (i< count -1) && (indices[i]+block_lengths[i] != indices[i+1]) )
481 if(old_type->flags_ & DT_FLAG_DERIVED)
484 if (not contiguous) {
485 *new_type = new Type_Indexed(size * old_type->size(),lb,ub,
486 DT_FLAG_DERIVED|DT_FLAG_DATA, count, block_lengths, indices, old_type);
488 Datatype::create_contiguous(size, old_type, lb, new_type);
493 int Datatype::create_hindexed(int count, const int* block_lengths, const MPI_Aint* indices, MPI_Datatype old_type, MPI_Datatype* new_type){
495 bool contiguous=true;
499 lb=indices[0] + old_type->lb();
500 ub=indices[0] + block_lengths[0]*old_type->ub();
502 for (int i = 0; i < count; i++) {
503 if (block_lengths[i] < 0)
505 size += block_lengths[i];
507 if(indices[i]+old_type->lb()<lb)
508 lb = indices[i]+old_type->lb();
509 if(indices[i]+block_lengths[i]*old_type->ub()>ub)
510 ub = indices[i]+block_lengths[i]*old_type->ub();
512 if ( (i< count -1) && (indices[i]+block_lengths[i]*(static_cast<int>(old_type->size())) != indices[i+1]) )
515 if (old_type->flags_ & DT_FLAG_DERIVED || lb!=0)
518 if (not contiguous) {
519 *new_type = new Type_Hindexed(size * old_type->size(),lb,ub,
520 DT_FLAG_DERIVED|DT_FLAG_DATA, count, block_lengths, indices, old_type);
522 Datatype::create_contiguous(size, old_type, lb, new_type);
527 int Datatype::create_struct(int count, const int* block_lengths, const MPI_Aint* indices, const MPI_Datatype* old_types, MPI_Datatype* new_type){
529 bool contiguous=true;
534 lb=indices[0] + old_types[0]->lb();
535 ub=indices[0] + block_lengths[0]*old_types[0]->ub();
537 bool forced_lb=false;
538 bool forced_ub=false;
539 for (int i = 0; i < count; i++) {
540 if (block_lengths[i]<0)
542 if (old_types[i]->flags_ & DT_FLAG_DERIVED)
545 size += block_lengths[i]*old_types[i]->size();
546 if (old_types[i]==MPI_LB){
550 if (old_types[i]==MPI_UB){
555 if (not forced_lb && indices[i] + old_types[i]->lb() < lb)
557 if (not forced_ub && indices[i] + block_lengths[i] * old_types[i]->ub() > ub)
558 ub = indices[i]+block_lengths[i]*old_types[i]->ub();
560 if ( (i< count -1) && (indices[i]+block_lengths[i]*static_cast<int>(old_types[i]->size()) != indices[i+1]) )
563 if (not contiguous) {
564 *new_type = new Type_Struct(size, lb,ub, DT_FLAG_DERIVED|DT_FLAG_DATA,
565 count, block_lengths, indices, old_types);
567 Datatype::create_contiguous(size, MPI_CHAR, lb, new_type);
572 int Datatype::create_subarray(int ndims, const int* array_of_sizes,
573 const int* array_of_subsizes, const int* array_of_starts,
574 int order, MPI_Datatype oldtype, MPI_Datatype *newtype){
577 for (int i = 0; i < ndims; i++) {
578 if (array_of_subsizes[i] > array_of_sizes[i]){
579 XBT_WARN("subarray : array_of_subsizes > array_of_sizes for dim %d",i);
582 if (array_of_starts[i] + array_of_subsizes[i] > array_of_sizes[i]){
583 XBT_WARN("subarray : array_of_starts + array_of_subsizes > array_of_sizes for dim %d",i);
588 MPI_Aint extent = oldtype->get_extent();
593 if( order==MPI_ORDER_C ) {
603 MPI_Aint size = (MPI_Aint)array_of_sizes[i] * (MPI_Aint)array_of_sizes[i+step];
604 MPI_Aint lb = (MPI_Aint)array_of_starts[i] + (MPI_Aint)array_of_starts[i+step] *(MPI_Aint)array_of_sizes[i];
606 create_vector( array_of_subsizes[i+step], array_of_subsizes[i], array_of_sizes[i],
611 for( i += 2 * step; i != end; i += step ) {
612 create_hvector( array_of_subsizes[i], 1, size * extent,
615 lb += size * array_of_starts[i];
616 size *= array_of_sizes[i];
620 const MPI_Aint lbs = lb * extent;
622 //handle LB and UB with a resized call
623 create_hindexed(1, &sizes, &lbs, tmp, newtype);
627 create_resized(tmp, 0, extent, newtype);
633 int Datatype::create_resized(MPI_Datatype oldtype,MPI_Aint lb, MPI_Aint extent, MPI_Datatype *newtype){
634 const std::array<int, 3> blocks = {{1, 1, 1}};
635 const std::array<MPI_Aint, 3> disps = {{lb, 0, lb + extent}};
636 const std::array<MPI_Datatype, 3> types = {{MPI_LB, oldtype, MPI_UB}};
638 *newtype = new simgrid::smpi::Type_Struct(oldtype->size(), lb, lb + extent, DT_FLAG_DERIVED, 3, blocks.data(),
639 disps.data(), types.data());
641 (*newtype)->addflag(~DT_FLAG_COMMITED);
645 Datatype* Datatype::f2c(int id)
647 return static_cast<Datatype*>(F2C::f2c(id));
650 } // namespace simgrid