This source file includes following definitions.
- MPI_File_read_shared
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8 #include "mpioimpl.h"
9
10 #ifdef HAVE_WEAK_SYMBOLS
11
12 #if defined(HAVE_PRAGMA_WEAK)
13 #pragma weak MPI_File_read_shared = PMPI_File_read_shared
14 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
15 #pragma _HP_SECONDARY_DEF PMPI_File_read_shared MPI_File_read_shared
16 #elif defined(HAVE_PRAGMA_CRI_DUP)
17 #pragma _CRI duplicate MPI_File_read_shared as PMPI_File_read_shared
18
19 #elif defined(HAVE_WEAK_ATTRIBUTE)
20 int MPI_File_read_shared(MPI_File fh, void *buf, int count, MPI_Datatype datatype,
21 MPI_Status *status) __attribute__((weak,alias("PMPI_File_read_shared")));
22 #endif
23
24
25 #define MPIO_BUILD_PROFILING
26 #include "mpioprof.h"
27 #endif
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45 int MPI_File_read_shared(MPI_File fh, void *buf, int count,
46 MPI_Datatype datatype, MPI_Status *status)
47 {
48 int error_code, buftype_is_contig, filetype_is_contig;
49 static char myname[] = "MPI_FILE_READ_SHARED";
50 MPI_Count datatype_size;
51 ADIO_Offset off, shared_fp, incr, bufsize;
52 ADIO_File adio_fh;
53 void *xbuf=NULL, *e32_buf=NULL;
54
55 ROMIO_THREAD_CS_ENTER();
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57 adio_fh = MPIO_File_resolve(fh);
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60 MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
61 MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
62 MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
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65 MPI_Type_size_x(datatype, &datatype_size);
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68 MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
69
70
71 if (count*datatype_size == 0)
72 {
73 #ifdef HAVE_STATUS_SET_BYTES
74 MPIR_Status_set_bytes(status, datatype, 0);
75 #endif
76 error_code = MPI_SUCCESS;
77 goto fn_exit;
78 }
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81 MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
82 MPIO_CHECK_READABLE(adio_fh, myname, error_code);
83 MPIO_CHECK_FS_SUPPORTS_SHARED(adio_fh, myname, error_code);
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86 ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
87 ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);
88
89 ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
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91 incr = (count*datatype_size)/adio_fh->etype_size;
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93 ADIO_Get_shared_fp(adio_fh, incr, &shared_fp, &error_code);
94
95 if (error_code != MPI_SUCCESS)
96 {
97 error_code = MPIO_Err_return_file(adio_fh, error_code);
98 goto fn_exit;
99 }
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102 xbuf = buf;
103 if (adio_fh->is_external32)
104 {
105 MPI_Aint e32_size = 0;
106 error_code = MPIU_datatype_full_size(datatype, &e32_size);
107 if (error_code != MPI_SUCCESS)
108 goto fn_exit;
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110 e32_buf = ADIOI_Malloc(e32_size*count);
111 xbuf = e32_buf;
112 }
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115 if (buftype_is_contig && filetype_is_contig)
116 {
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118 bufsize = datatype_size * count;
119 off = adio_fh->disp + adio_fh->etype_size * shared_fp;
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125 if ((adio_fh->atomicity) && (adio_fh->file_system != ADIO_NFS))
126 ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
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128 ADIO_ReadContig(adio_fh, xbuf, count, datatype, ADIO_EXPLICIT_OFFSET,
129 off, status, &error_code);
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131 if ((adio_fh->atomicity) && (adio_fh->file_system != ADIO_NFS))
132 ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
133 }
134 else
135 {
136 ADIO_ReadStrided(adio_fh, xbuf, count, datatype, ADIO_EXPLICIT_OFFSET,
137 shared_fp, status, &error_code);
138
139 }
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142 if (error_code != MPI_SUCCESS)
143 error_code = MPIO_Err_return_file(adio_fh, error_code);
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146 if (e32_buf != NULL) {
147 error_code = MPIU_read_external32_conversion_fn(buf, datatype,
148 count, e32_buf);
149 ADIOI_Free(e32_buf);
150 }
151 fn_exit:
152 ROMIO_THREAD_CS_EXIT();
153
154 return error_code;
155 }