diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/H5FPserver.c | 89 |
1 files changed, 41 insertions, 48 deletions
diff --git a/src/H5FPserver.c b/src/H5FPserver.c index 39258f0..5d85021 100644 --- a/src/H5FPserver.c +++ b/src/H5FPserver.c @@ -56,10 +56,10 @@ static int interface_initialize_g = 0; * appropriate H5FP_file_info structure. */ typedef struct { - hobj_ref_t oid; /* Buffer to store OID of object */ - unsigned owned_rank; /* rank which has the lock */ + hobj_ref_t oid; /* buffer to store OID of object */ + unsigned char *num_locks; /* number of times a rank has a lock */ + unsigned num_procs; /* number of processes that have the lock */ H5FP_obj_t obj_type; /* type of object being locked */ - unsigned ref_count; /* number of times lock was aquired by proc */ H5FP_lock_t rw_lock; /* indicates if it's a read or write lock */ } H5FP_object_lock; @@ -334,17 +334,26 @@ static H5FP_object_lock * H5FP_new_object_lock(hobj_ref_t oid, unsigned rank, H5FP_obj_t obj_type, H5FP_lock_t rw_lock) { - H5FP_object_lock *ret_value = NULL; + int comm_size; + H5FP_object_lock *ret_value = NULL; FUNC_ENTER_NOINIT(H5FP_new_object_lock); + if (MPI_Comm_size(H5FP_SAP_COMM, &comm_size) != MPI_SUCCESS) + HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, NULL, "MPI_Comm_size failed"); + if ((ret_value = (H5FP_object_lock *)HDmalloc(sizeof(H5FP_object_lock))) == NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "out of memory"); + if ((ret_value->num_locks = (unsigned char *)HDcalloc(comm_size, 1)) == NULL) { + HDfree(ret_value); + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "out of memory"); + } + ret_value->oid = oid; - ret_value->owned_rank = rank; + ret_value->num_locks[rank] = TRUE; ret_value->obj_type = obj_type; - ret_value->ref_count = 1; + ret_value->num_procs = 1; ret_value->rw_lock = rw_lock; done: @@ -362,7 +371,12 @@ static herr_t H5FP_free_object_lock(H5FP_object_lock *ol) { FUNC_ENTER_NOINIT(H5FP_free_object_lock); - HDfree(ol); + + if (ol) { + HDfree(ol->num_locks); + HDfree(ol); + } + FUNC_LEAVE_NOAPI(SUCCEED); } @@ -1011,7 +1025,7 @@ H5FP_sap_handle_lock_request(H5FP_request_t *req) oids[j].lock->rw_lock == H5FP_LOCK_READ) || (oids[j].rw_lock == H5FP_LOCK_WRITE && oids[j].lock->rw_lock == H5FP_LOCK_WRITE && - oids[j].lock->owned_rank == req->proc_rank))) { + oids[j].lock->num_locks[req->proc_rank]))) { /* FAILURE */ exit_state = H5FP_STATUS_LOCK_FAILED; HGOTO_DONE(FAIL); @@ -1041,14 +1055,18 @@ H5FP_sap_handle_lock_request(H5FP_request_t *req) oids[j].lock->rw_lock == H5FP_LOCK_READ) || (oids[j].rw_lock == H5FP_LOCK_WRITE && oids[j].lock->rw_lock == H5FP_LOCK_WRITE && - oids[j].lock->owned_rank == req->proc_rank)) { + oids[j].lock->num_locks[req->proc_rank])) { /* * The requesting process may already have this lock. Might * be a request from some call-back function of some sort. - * Increase the reference count (which is decreased when - * released) to help to prevent deadlocks. + * Increase the reference count if this process hasn't + * gotten a lock on this before and then increment that + * process's num_locks reference count. */ - ++oids[j].lock->ref_count; + if (!oids[j].lock->num_locks[req->proc_rank]) + ++oids[j].lock->num_procs; + + ++oids[j].lock->num_locks[req->proc_rank]; oids[j].locked = TRUE; } else { /* FIXME: reply saying object locked? */ @@ -1093,10 +1111,10 @@ rollback: for (j = 0; j <= i; ++j) { if (oids[j].locked) { if (oids[j].lock) { - if (oids[j].lock->owned_rank == req->proc_rank) { - if (--oids[j].lock->ref_count == 0) { - H5FP_remove_object_lock_from_list(oids[j].info, oids[j].lock); - } + if (oids[j].lock->num_locks[req->proc_rank]) { + if (--oids[j].lock->num_locks[req->proc_rank] == 0) + if (--oids[j].lock->num_procs == 0) + H5FP_remove_object_lock_from_list(oids[j].info, oids[j].lock); } else { /* CATASTROPHIC FAILURE!!! */ /* LOCK WAS NOT CLEARED */ @@ -1193,7 +1211,7 @@ H5FP_sap_handle_release_lock_request(H5FP_request_t *req) oids[j].lock = H5FP_find_object_lock(oids[j].info, oids[j].oid); - if (!oids[j].lock || oids[j].lock->owned_rank != req->proc_rank) { + if (!oids[j].lock || !oids[j].lock->num_locks[req->proc_rank]) { exit_state = H5FP_STATUS_BAD_LOCK; HGOTO_DONE(FAIL); } @@ -1206,9 +1224,10 @@ H5FP_sap_handle_release_lock_request(H5FP_request_t *req) */ for (j = 0; j <= i; ++j) { if (oids[j].lock) { - if (oids[j].lock->owned_rank == req->proc_rank) { - if (--oids[j].lock->ref_count == 0) - H5FP_remove_object_lock_from_list(oids[j].info, oids[j].lock); + if (oids[j].lock->num_locks[req->proc_rank]) { + if (--oids[j].lock->num_locks[req->proc_rank] == 0) + if (--oids[j].lock->num_procs == 0) + H5FP_remove_object_lock_from_list(oids[j].info, oids[j].lock); } else { /* AAAIIIIEEE!!! */ exit_state = H5FP_STATUS_CATASTROPHIC; @@ -1286,7 +1305,7 @@ H5FP_sap_handle_read_request(H5FP_request_t *req) r.md_size = fm->md_size - (req->addr - fm->addr); r.addr = req->addr; r.status = H5FP_STATUS_OK; - metadata = fm->metadata + (req->addr - fm->addr); /* Sent out in a separate message */ + metadata = fm->metadata + (req->addr - fm->addr); /* Sent out separately */ } else { HDfprintf(stderr, "Panic!!!!\n"); assert(0); @@ -1316,9 +1335,7 @@ done: * file. * * N.B: We assume that the client has the lock on the - * requesting object before getting here. Why? Because it's - * hard to pass the OID for that object down to the - * low-level I/O routines...*sigh* + * requesting object before getting here. * Return: Success: SUCCEED * Failure: FAIL * Programmer: Bill Wendling, 06. August, 2002 @@ -1334,10 +1351,6 @@ H5FP_sap_handle_write_request(H5FP_request_t *req, char *mdata, unsigned md_size FUNC_ENTER_NOINIT(H5FP_sap_handle_write_request); if ((info = H5FP_find_file_info(req->file_id)) != NULL) { -#if 0 - H5FP_object_lock *lock; -#endif /* 0 */ - if (info->num_mods >= H5FP_MDATA_CACHE_HIGHWATER_MARK) { /* * If there are any modifications not written out yet, dump @@ -1363,26 +1376,6 @@ H5FP_sap_handle_write_request(H5FP_request_t *req, char *mdata, unsigned md_size HGOTO_DONE(FAIL); } -#if 0 - /* - * We're assuming that the client has the correct lock at this - * point... - */ - - /* handle the change request */ - lock = H5FP_find_object_lock(info, req->oid); - - if (!lock || lock->owned_rank != req->proc_rank - || lock->rw_lock != H5FP_LOCK_WRITE) { - /* - * There isn't a write lock or we don't own the write - * lock on this OID - */ - exit_state = H5FP_STATUS_NO_LOCK; - HGOTO_DONE(FAIL); - } -#endif /* 0 */ - if (H5FP_add_file_mod_to_list(info, req->mem_type, (haddr_t)req->addr, req->proc_rank, md_size, mdata) != SUCCEED) { exit_state = H5FP_STATUS_OOM; |