Commit d34a1648 authored by Junchao Zhang's avatar Junchao Zhang
Browse files

Fix bugs in comm_spawn & comm_spawn_multiple

One bug is related to converting the array_of_argv argument in MPI_Comm_spawn_multiple
from a Fortran style, i.e. type CHARACTER(LEN=*), INTENT(IN) :: array_of_argv(count, *),
to a C style, i.e., char** array_of_argv[count]

No review since F08 binding is experimental now.
parent cfa1fa4b
......@@ -2347,12 +2347,12 @@ function MPIR_Comm_spawn_multiple_c(count, array_of_commands, array_of_argv, arr
use, intrinsic :: iso_c_binding, only : c_int, c_char, c_ptr
use :: mpi_c_interface_types, only : c_Info, c_Comm
implicit none
integer(c_int), intent(in) :: count
integer(c_int), value, intent(in) :: count
type(c_ptr), value, intent(in) :: array_of_commands
type(c_ptr), value, intent(in) :: array_of_argv
integer(c_int), intent(in) :: array_of_maxprocs(*)
integer(c_Info), intent(in) :: array_of_info(*)
integer(c_int), intent(in) :: root
integer(c_int), value, intent(in) :: root
integer(c_Comm), value, intent(in) :: comm
integer(c_Comm), intent(out) :: intercomm
type(c_ptr), value, intent(in) :: array_of_errcodes
......@@ -272,7 +272,7 @@ extern int MPIR_Fortran_array_of_string_f2c(const char* strs_f, char*** strs_c,
extern int MPIR_Comm_spawn_c(const char *command, char *argv_f, int maxprocs, MPI_Info info, int root,
MPI_Comm comm, MPI_Comm *intercomm, int* array_of_errcodes, int argv_elem_len);
extern int MPIR_Comm_spawn_multiple_c(int count, char *array_of_commands_f,
char **array_of_argv_f, const int* array_of_maxprocs,
char *array_of_argv_f, const int* array_of_maxprocs,
const MPI_Info *array_of_info, int root, MPI_Comm comm,
MPI_Comm *intercomm, int* array_of_errcodes,
int commands_elem_len, int argv_elem_len);
......@@ -10,7 +10,8 @@ int MPIR_Comm_spawn_c(const char *command, char *argv_f, int maxprocs, MPI_Info
if ((char**)argv_f == MPI_ARGV_NULL) {
argv_c = MPI_ARGV_NULL;
} else {
mpi_errno = MPIR_Fortran_array_of_string_f2c(argv_f, &argv_c, argv_elem_len, 0, 0); /* Don't know size */
mpi_errno = MPIR_Fortran_array_of_string_f2c(argv_f, &argv_c, argv_elem_len,
0 /* Don't know size of argv_f */, 0);
if (mpi_errno != MPI_SUCCESS) goto fn_fail;
......@@ -5,38 +5,95 @@
#define FUNCNAME MPIR_Comm_spawn_multiple_c
#undef FCNAME
int MPIR_Comm_spawn_multiple_c(int count, char *array_of_commands_f,
char **array_of_argv_f, const int* array_of_maxprocs,
const MPI_Info *array_of_info, int root, MPI_Comm comm,
MPI_Comm *intercomm, int* array_of_errcodes,
int MPIR_Comm_spawn_multiple_c(int count, char* array_of_commands_f,
char* array_of_argv_f, const int* array_of_maxprocs,
const MPI_Info* array_of_info, int root, MPI_Comm comm,
MPI_Comm* intercomm, int* array_of_errcodes,
int commands_elem_len, int argv_elem_len)
int mpi_errno = MPI_SUCCESS;
char*** array_of_argv_c = NULL;
char** array_of_commands_c = NULL;
int i, j;
char*** array_of_argv_c = NULL;
int i, j, offset, len, terminate;
char *buf, *newbuf;
/* array_of_commands_f in Fortran has type CHARACTER(LEN=*), INTENT(IN) :: array_of_commands(*).
It contains commands array_of_commands(1), ..., array_of_commands(count). Each is a Fortran
string of length commands_elem_len, which equals to len(array_of_commands).
We need to convert array_of_commands_f into array_of_commands_c, which in C has type
char* array_of_commands_c[count], in other words, each element is a pointer to string.
mpi_errno = MPIR_Fortran_array_of_string_f2c(array_of_commands_f, &array_of_commands_c,
commands_elem_len, 1, count); /* array_of_commands_f size is known */
commands_elem_len, 1 /* size of array_of_commands_f is known */, count);
if (mpi_errno != MPI_SUCCESS) goto fn_fail;
/* array_of_argv_f in Fortran has type CHARACTER(LEN=*), INTENT(IN) :: array_of_argv(count, *).
For a particular command number K (in the range 1..count), array_of_argv (K, 1) is the first
argument, array_of_argv(K,2) is the second argument, ... etc., until you get to array_of_argv(K,J)
being a string of all blank characters. That indicates that command K has J-1 arguments.
The value of J might be different from each command, but the size of the second dimension of
array_of_argv is the largest value of J for all the commands. The actual memory layout of
the array is (arg1 for command 1) (arg1 for command 2) ... (arg1 for command COUNT)
(arg2 for command 1) ...
We need to convert array_of_argv_f into array_of_argv_c, which in C has type
char** array_of_argv_c[count], with each element pointing to an array of pointers.
For example, array_of_argv_c[0] points to an array of pointers to string.
array_of_argv_c[0][0] points to 1st arg of command 0. array_of_argv_c[0][0] points
to 2nd arg of command 0, etc. If array_of_argv_c[0][J] is NULL, then command 0
has J args.
if ((char***)array_of_argv_f == MPI_ARGVS_NULL) {
array_of_argv_c = MPI_ARGVS_NULL;
} else {
array_of_argv_c = (char***) MPIU_Malloc(sizeof(char**)*count);
if (array_of_argv_c == NULL) {
MPIU_ERR_SETANDJUMP(mpi_errno, MPI_ERR_OTHER, "**nomem");
if (!array_of_argv_c) MPIU_ERR_SETANDJUMP(mpi_errno, MPI_ERR_OTHER, "**nomem");
/* Allocate a temp buf to put args of a command */
len = 256; /* length of buf. Initialized with an arbitrary value */
buf = (char*)MPIU_Malloc(sizeof(char)*len);
if (!buf) MPIU_ERR_SETANDJUMP(mpi_errno, MPI_ERR_OTHER, "**nomem");
for (i = 0; i < count; i++) {
mpi_errno = MPIR_Fortran_array_of_string_f2c(array_of_argv_f[i],
&(array_of_argv_c[i]), argv_elem_len, 0, 0); /* array_of_argv_f[i] size is unknown */
/* Extract args of command i, and put them in buf */
offset = 0; /* offset in bytes in buf to put next arg */
char* arg = array_of_argv_f + argv_elem_len * i; /* Point to 1st arg of command i */
do {
if (offset + argv_elem_len > len) { /* Make sure buf is big enough */
len = offset + argv_elem_len;
newbuf = (char*)MPIU_Realloc(buf, len);
if (!newbuf) {
MPIU_ERR_SETANDJUMP(mpi_errno, MPI_ERR_OTHER, "**nomem");
buf = newbuf;
/* Check if arg is a terminating blank string */
j = 0;
while (arg[j] == ' ' && j < argv_elem_len) j++;
terminate = (j == argv_elem_len);
strncpy(buf + offset, arg, argv_elem_len); /* Copy it even it is all blank */
arg += argv_elem_len * count; /* Move to next arg of command i */
offset += argv_elem_len;
} while(!terminate);
/* Convert the args into C style. We indicate we don't know the count of strings so
that a NULL pointer will be appended at the end.
mpi_errno = MPIR_Fortran_array_of_string_f2c(buf, &(array_of_argv_c[i]), argv_elem_len, 0, 0);
if (mpi_errno != MPI_SUCCESS) {
for (j = i - 1; j >= 0; j--)
goto fn_fail;
mpi_errno = PMPI_Comm_spawn_multiple(count, array_of_commands_c, array_of_argv_c,
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