1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
2 /*
3 * Copyright (C) 1997 University of Chicago.
4 * See COPYRIGHT notice in top-level directory.
5 */
6
7 #include "mpioimpl.h"
8
9 #ifdef HAVE_WEAK_SYMBOLS
10
11 #if defined(HAVE_PRAGMA_WEAK)
12 #pragma weak MPI_File_read = PMPI_File_read
13 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
14 #pragma _HP_SECONDARY_DEF PMPI_File_read MPI_File_read
15 #elif defined(HAVE_PRAGMA_CRI_DUP)
16 #pragma _CRI duplicate MPI_File_read as PMPI_File_read
17 /* end of weak pragmas */
18 #elif defined(HAVE_WEAK_ATTRIBUTE)
19 int MPI_File_read(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status)
20 __attribute__((weak,alias("PMPI_File_read")));
21 #endif
22
23 /* Include mapping from MPI->PMPI */
24 #define MPIO_BUILD_PROFILING
25 #include "mpioprof.h"
26 #endif
27
28 /* status object not filled currently */
29
30 /*@
31 MPI_File_read - Read using individual file pointer
32
33 Input Parameters:
34 . fh - file handle (handle)
35 . count - number of elements in buffer (nonnegative integer)
36 . datatype - datatype of each buffer element (handle)
37
38 Output Parameters:
39 . buf - initial address of buffer (choice)
40 . status - status object (Status)
41
42 .N fortran
43 @*/
MPI_File_read(MPI_File fh,void * buf,int count,MPI_Datatype datatype,MPI_Status * status)44 int MPI_File_read(MPI_File fh, void *buf, int count,
45 MPI_Datatype datatype, MPI_Status *status)
46 {
47 int error_code;
48 static char myname[] = "MPI_FILE_READ";
49 #ifdef MPI_hpux
50 int fl_xmpi;
51
52 HPMP_IO_START(fl_xmpi, BLKMPIFILEREAD, TRDTBLOCK, fh, datatype, count);
53 #endif /* MPI_hpux */
54
55 error_code = MPIOI_File_read(fh, (MPI_Offset) 0, ADIO_INDIVIDUAL, buf,
56 count, datatype, myname, status);
57
58 #ifdef MPI_hpux
59 HPMP_IO_END(fl_xmpi, fh, datatype, count);
60 #endif /* MPI_hpux */
61
62 return error_code;
63 }
64
65 /* prevent multiple definitions of this routine */
66 #ifdef MPIO_BUILD_PROFILING
MPIOI_File_read(MPI_File fh,MPI_Offset offset,int file_ptr_type,void * buf,int count,MPI_Datatype datatype,char * myname,MPI_Status * status)67 int MPIOI_File_read(MPI_File fh,
68 MPI_Offset offset,
69 int file_ptr_type,
70 void *buf,
71 int count,
72 MPI_Datatype datatype,
73 char *myname,
74 MPI_Status *status)
75 {
76 int error_code, buftype_is_contig, filetype_is_contig;
77 MPI_Count datatype_size;
78 ADIO_File adio_fh;
79 ADIO_Offset off, bufsize;
80 void *xbuf=NULL, *e32_buf=NULL;
81
82 MPIU_THREAD_CS_ENTER(ALLFUNC,);
83
84 adio_fh = MPIO_File_resolve(fh);
85
86 /* --BEGIN ERROR HANDLING-- */
87 MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
88 MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
89 MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
90
91 if (file_ptr_type == ADIO_EXPLICIT_OFFSET && offset < 0)
92 {
93 error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
94 myname, __LINE__, MPI_ERR_ARG,
95 "**iobadoffset", 0);
96 error_code = MPIO_Err_return_file(adio_fh, error_code);
97 goto fn_exit;
98 }
99 /* --END ERROR HANDLING-- */
100
101 MPI_Type_size_x(datatype, &datatype_size);
102
103 /* --BEGIN ERROR HANDLING-- */
104 MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
105 /* --END ERROR HANDLING-- */
106
107 if (count*datatype_size == 0)
108 {
109 #ifdef HAVE_STATUS_SET_BYTES
110 MPIR_Status_set_bytes(status, datatype, 0);
111 #endif
112 error_code = MPI_SUCCESS;
113 goto fn_exit;
114 }
115
116 /* --BEGIN ERROR HANDLING-- */
117 MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
118 MPIO_CHECK_READABLE(adio_fh, myname, error_code);
119 MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
120 /* --END ERROR HANDLING-- */
121
122 ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
123 ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);
124
125 ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
126
127 xbuf = buf;
128 if (adio_fh->is_external32)
129 {
130 MPI_Aint e32_size = 0;
131 error_code = MPIU_datatype_full_size(datatype, &e32_size);
132 if (error_code != MPI_SUCCESS)
133 goto fn_exit;
134
135 e32_buf = ADIOI_Malloc(e32_size*count);
136 xbuf = e32_buf;
137 }
138
139 if (buftype_is_contig && filetype_is_contig)
140 {
141 /* convert count and offset to bytes */
142 bufsize = datatype_size * count;
143 if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {
144 off = adio_fh->disp + adio_fh->etype_size * offset;
145 }
146 else /* ADIO_INDIVIDUAL */ {
147 off = adio_fh->fp_ind;
148 }
149
150 /* if atomic mode requested, lock (exclusive) the region, because
151 there could be a concurrent noncontiguous request.
152 */
153 if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS)) {
154 ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
155 }
156
157 ADIO_ReadContig(adio_fh, xbuf, count, datatype, file_ptr_type,
158 off, status, &error_code);
159
160 if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS)) {
161 ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
162 }
163 }
164 else
165 {
166 ADIO_ReadStrided(adio_fh, xbuf, count, datatype, file_ptr_type,
167 offset, status, &error_code);
168 /* For strided and atomic mode, locking is done in ADIO_ReadStrided */
169 }
170
171 /* --BEGIN ERROR HANDLING-- */
172 if (error_code != MPI_SUCCESS)
173 error_code = MPIO_Err_return_file(adio_fh, error_code);
174 /* --END ERROR HANDLING-- */
175
176 if (e32_buf != NULL) {
177 error_code = MPIU_read_external32_conversion_fn(buf, datatype,
178 count, e32_buf);
179 ADIOI_Free(e32_buf);
180 }
181
182 fn_exit:
183 MPIU_THREAD_CS_EXIT(ALLFUNC,);
184
185 return error_code;
186 }
187 #endif
188