This source file includes following definitions.
- shmem_ds_reset
- module_init
- module_finalize
- ds_copy
- segment_create
- segment_attach
- segment_detach
- segment_unlink
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  24 #include "opal_config.h"
  25 
  26 #include <errno.h>
  27 #ifdef HAVE_FCNTL_H
  28 #include <fcntl.h>
  29 #endif  
  30 #ifdef HAVE_SYS_MMAN_H
  31 #include <sys/mman.h>
  32 #endif 
  33 #ifdef HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif 
  36 #ifdef HAVE_SYS_TYPES_H
  37 #include <sys/types.h>
  38 #endif 
  39 #ifdef HAVE_SYS_IPC_H
  40 #include <sys/ipc.h>
  41 #endif 
  42 #if HAVE_SYS_SHM_H
  43 #include <sys/shm.h>
  44 #endif 
  45 #if HAVE_SYS_STAT_H
  46 #include <sys/stat.h>
  47 #endif 
  48 #include <string.h>
  49 #ifdef HAVE_NETDB_H
  50 #include <netdb.h>
  51 #endif 
  52 
  53 #include "opal/constants.h"
  54 #include "opal_stdint.h"
  55 #include "opal/util/output.h"
  56 #include "opal/util/path.h"
  57 #include "opal/util/show_help.h"
  58 #include "opal/mca/shmem/shmem.h"
  59 #include "opal/mca/shmem/base/base.h"
  60 
  61 #include "shmem_sysv.h"
  62 
  63 
  64 
  65 
  66 
  67 static int
  68 module_init(void);
  69 
  70 static int
  71 segment_create(opal_shmem_ds_t *ds_buf,
  72                const char *file_name,
  73                size_t size);
  74 
  75 static int
  76 ds_copy(const opal_shmem_ds_t *from,
  77         opal_shmem_ds_t *to);
  78 
  79 static void *
  80 segment_attach(opal_shmem_ds_t *ds_buf);
  81 
  82 static int
  83 segment_detach(opal_shmem_ds_t *ds_buf);
  84 
  85 static int
  86 segment_unlink(opal_shmem_ds_t *ds_buf);
  87 
  88 static int
  89 module_finalize(void);
  90 
  91 
  92 opal_shmem_sysv_module_t opal_shmem_sysv_module = {
  93     .super = {
  94         .module_init = module_init,
  95         .segment_create = segment_create,
  96         .ds_copy = ds_copy,
  97         .segment_attach = segment_attach,
  98         .segment_detach = segment_detach,
  99         .unlink = segment_unlink,
 100         .module_finalize = module_finalize
 101     }
 102 };
 103 
 104 
 105 
 106 
 107 
 108 
 109 
 110 
 111 
 112 static inline void
 113 shmem_ds_reset(opal_shmem_ds_t *ds_buf)
 114 {
 115     
 116     OPAL_OUTPUT_VERBOSE(
 117         (70, opal_shmem_base_framework.framework_output,
 118          "%s: %s: shmem_ds_resetting\n",
 119          mca_shmem_sysv_component.super.base_version.mca_type_name,
 120          mca_shmem_sysv_component.super.base_version.mca_component_name)
 121     );
 122 
 123     ds_buf->seg_cpid = 0;
 124     OPAL_SHMEM_DS_RESET_FLAGS(ds_buf);
 125     ds_buf->seg_id = OPAL_SHMEM_DS_ID_INVALID;
 126     ds_buf->seg_size = 0;
 127     memset(ds_buf->seg_name, '\0', OPAL_PATH_MAX);
 128     ds_buf->seg_base_addr = (unsigned char *)-1;
 129 }
 130 
 131 
 132 static int
 133 module_init(void)
 134 {
 135     
 136     return OPAL_SUCCESS;
 137 }
 138 
 139 
 140 static int
 141 module_finalize(void)
 142 {
 143     
 144     return OPAL_SUCCESS;
 145 }
 146 
 147 
 148 static int
 149 ds_copy(const opal_shmem_ds_t *from,
 150         opal_shmem_ds_t *to)
 151 {
 152     memcpy(to, from, sizeof(opal_shmem_ds_t));
 153 
 154     OPAL_OUTPUT_VERBOSE(
 155         (70, opal_shmem_base_framework.framework_output,
 156          "%s: %s: ds_copy complete "
 157          "from: (id: %d, size: %lu, "
 158          "name: %s flags: 0x%02x) "
 159          "to: (id: %d, size: %lu, "
 160          "name: %s flags: 0x%02x)\n",
 161          mca_shmem_sysv_component.super.base_version.mca_type_name,
 162          mca_shmem_sysv_component.super.base_version.mca_component_name,
 163          from->seg_id, (unsigned long)from->seg_size, from->seg_name,
 164          from->flags, to->seg_id, (unsigned long)to->seg_size, to->seg_name,
 165          to->flags)
 166     );
 167 
 168     return OPAL_SUCCESS;
 169 }
 170 
 171 
 172 static int
 173 segment_create(opal_shmem_ds_t *ds_buf,
 174                const char *file_name,
 175                size_t size)
 176 {
 177     int rc = OPAL_SUCCESS;
 178     pid_t my_pid = getpid();
 179     
 180 
 181 
 182     size_t real_size = size + sizeof(opal_shmem_seg_hdr_t);
 183     opal_shmem_seg_hdr_t *seg_hdrp = MAP_FAILED;
 184 
 185     
 186     shmem_ds_reset(ds_buf);
 187 
 188     
 189 
 190 
 191 
 192     
 193 
 194 
 195     if (-1 == (ds_buf->seg_id = shmget(IPC_PRIVATE, real_size,
 196                                        IPC_CREAT | IPC_EXCL | S_IRWXU))) {
 197         int err = errno;
 198         char hn[OPAL_MAXHOSTNAMELEN];
 199         gethostname(hn, sizeof(hn));
 200         opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
 201                        "shmget(2)", "", strerror(err), err);
 202         rc = OPAL_ERROR;
 203         goto out;
 204     }
 205     
 206     else if ((void *)-1 == (seg_hdrp = shmat(ds_buf->seg_id, NULL, 0))) {
 207         int err = errno;
 208         char hn[OPAL_MAXHOSTNAMELEN];
 209         gethostname(hn, sizeof(hn));
 210         opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
 211                        "shmat(2)", "", strerror(err), err);
 212         shmctl(ds_buf->seg_id, IPC_RMID, NULL);
 213         rc = OPAL_ERROR;
 214         goto out;
 215     }
 216     
 217 
 218 
 219 
 220     else if (0 != shmctl(ds_buf->seg_id, IPC_RMID, NULL)) {
 221         int err = errno;
 222         char hn[OPAL_MAXHOSTNAMELEN];
 223         gethostname(hn, sizeof(hn));
 224         opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
 225                        "shmctl(2)", "", strerror(err), err);
 226         rc = OPAL_ERROR;
 227         goto out;
 228     }
 229     
 230     else {
 231         
 232         opal_atomic_rmb();
 233 
 234         
 235         opal_atomic_lock_init(&seg_hdrp->lock, OPAL_ATOMIC_LOCK_UNLOCKED);
 236         
 237         seg_hdrp->cpid = my_pid;
 238 
 239         opal_atomic_wmb();
 240 
 241         
 242         ds_buf->seg_cpid = my_pid;
 243         ds_buf->seg_size = real_size;
 244         ds_buf->seg_base_addr = (unsigned char *)seg_hdrp;
 245 
 246         
 247 
 248 
 249 
 250 
 251         
 252         OPAL_SHMEM_DS_SET_VALID(ds_buf);
 253 
 254         OPAL_OUTPUT_VERBOSE(
 255             (70, opal_shmem_base_framework.framework_output,
 256              "%s: %s: create successful "
 257              "(id: %d, size: %lu, name: %s)\n",
 258              mca_shmem_sysv_component.super.base_version.mca_type_name,
 259              mca_shmem_sysv_component.super.base_version.mca_component_name,
 260              ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
 261         );
 262     }
 263 
 264 out:
 265     
 266 
 267 
 268     if (OPAL_SUCCESS != rc) {
 269         
 270         if ((void *)-1 != seg_hdrp) {
 271             shmdt((char*)seg_hdrp);
 272         }
 273         shmctl(ds_buf->seg_id, IPC_RMID, NULL);
 274 
 275         
 276         shmem_ds_reset(ds_buf);
 277     }
 278     return rc;
 279 }
 280 
 281 
 282 
 283 
 284 
 285 static void *
 286 segment_attach(opal_shmem_ds_t *ds_buf)
 287 {
 288     pid_t my_pid = getpid();
 289 
 290     if (my_pid != ds_buf->seg_cpid) {
 291         if ((void *)-1 == (ds_buf->seg_base_addr = shmat(ds_buf->seg_id, NULL,
 292                                                          0))) {
 293             int err = errno;
 294             char hn[OPAL_MAXHOSTNAMELEN];
 295             gethostname(hn, sizeof(hn));
 296             opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
 297                            "shmat(2)", "", strerror(err), err);
 298             shmctl(ds_buf->seg_id, IPC_RMID, NULL);
 299             return NULL;
 300         }
 301     }
 302     
 303 
 304 
 305 
 306     OPAL_OUTPUT_VERBOSE(
 307         (70, opal_shmem_base_framework.framework_output,
 308          "%s: %s: attach successful "
 309          "(id: %d, size: %lu, name: %s)\n",
 310          mca_shmem_sysv_component.super.base_version.mca_type_name,
 311          mca_shmem_sysv_component.super.base_version.mca_component_name,
 312          ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
 313     );
 314 
 315     
 316     return (ds_buf->seg_base_addr + sizeof(opal_shmem_seg_hdr_t));
 317 }
 318 
 319 
 320 static int
 321 segment_detach(opal_shmem_ds_t *ds_buf)
 322 {
 323     int rc = OPAL_SUCCESS;
 324 
 325     OPAL_OUTPUT_VERBOSE(
 326         (70, opal_shmem_base_framework.framework_output,
 327          "%s: %s: detaching "
 328          "(id: %d, size: %lu, name: %s)\n",
 329          mca_shmem_sysv_component.super.base_version.mca_type_name,
 330          mca_shmem_sysv_component.super.base_version.mca_component_name,
 331          ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
 332     );
 333 
 334     if (0 != shmdt((char*)ds_buf->seg_base_addr)) {
 335         int err = errno;
 336         char hn[OPAL_MAXHOSTNAMELEN];
 337         gethostname(hn, sizeof(hn));
 338         opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
 339                        "shmdt(2)", "", strerror(err), err);
 340         rc = OPAL_ERROR;
 341     }
 342 
 343     
 344 
 345 
 346     shmem_ds_reset(ds_buf);
 347     return rc;
 348 }
 349 
 350 
 351 static int
 352 segment_unlink(opal_shmem_ds_t *ds_buf)
 353 {
 354     
 355 
 356     OPAL_OUTPUT_VERBOSE(
 357         (70, opal_shmem_base_framework.framework_output,
 358          "%s: %s: unlinking "
 359          "(id: %d, size: %lu, name: %s)\n",
 360          mca_shmem_sysv_component.super.base_version.mca_type_name,
 361          mca_shmem_sysv_component.super.base_version.mca_component_name,
 362          ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
 363     );
 364 
 365     
 366 
 367 
 368 
 369     ds_buf->seg_id = OPAL_SHMEM_DS_ID_INVALID;
 370     
 371     OPAL_SHMEM_DS_INVALIDATE(ds_buf);
 372     return OPAL_SUCCESS;
 373 }
 374