diff options
Diffstat (limited to 'src/H5Fint.c')
| -rw-r--r-- | src/H5Fint.c | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/src/H5Fint.c b/src/H5Fint.c index 9ddd3d7..c8e2cad 100644 --- a/src/H5Fint.c +++ b/src/H5Fint.c @@ -918,9 +918,10 @@ done: htri_t H5F__is_hdf5(const char *name) { - H5FD_t *file = NULL; /* Low-level file struct */ - haddr_t sig_addr = HADDR_UNDEF; /* Addess of hdf5 file signature */ - htri_t ret_value = FAIL; /* Return value */ + H5FD_t * file = NULL; /* Low-level file struct */ + H5F_shared_t *shared = NULL; /* Shared part of file */ + haddr_t sig_addr = HADDR_UNDEF; /* Addess of hdf5 file signature */ + htri_t ret_value = FAIL; /* Return value */ FUNC_ENTER_PACKAGE @@ -928,10 +929,20 @@ H5F__is_hdf5(const char *name) if (NULL == (file = H5FD_open(name, H5F_ACC_RDONLY, H5P_FILE_ACCESS_DEFAULT, HADDR_UNDEF))) HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to open file") - /* The file is an hdf5 file if the hdf5 file signature can be found */ - if (H5FD_locate_signature(file, &sig_addr) < 0) - HGOTO_ERROR(H5E_FILE, H5E_NOTHDF5, FAIL, "error while trying to locate file signature") - ret_value = (HADDR_UNDEF != sig_addr); + /* If the file is already open, it's an HDF5 file + * + * If the file is open with an exclusive lock on an operating system that enforces + * mandatory file locks (like Windows), creating a new file handle and attempting + * to read through it will fail so we have to try this first. + */ + if ((shared = H5F__sfile_search(file)) != NULL) + ret_value = TRUE; + else { + /* The file is an HDF5 file if the HDF5 file signature can be found */ + if (H5FD_locate_signature(file, &sig_addr) < 0) + HGOTO_ERROR(H5E_FILE, H5E_NOTHDF5, FAIL, "error while trying to locate file signature") + ret_value = (HADDR_UNDEF != sig_addr); + } done: /* Close the file */ @@ -1603,7 +1614,7 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id) FUNC_ENTER_NOAPI(NULL) /* - * If the driver has a `cmp' method then the driver is capable of + * If the driver has a 'cmp' method then the driver is capable of * determining when two file handles refer to the same file and the * library can insure that when the application opens a file twice * that the two handles coordinate their operations appropriately. @@ -3546,10 +3557,17 @@ H5F__start_swmr_write(H5F_t *f) setup = TRUE; /* Place an advisory lock on the file */ - if (H5F_USE_FILE_LOCKING(f)) + if (H5F_USE_FILE_LOCKING(f)) { + /* Have to unlock on Windows as Win32 doesn't support changing the lock + * type (exclusive vs shared) with a second call. + */ + if (H5FD_unlock(f->shared->lf) < 0) { + HGOTO_ERROR(H5E_FILE, H5E_CANTUNLOCKFILE, FAIL, "unable to unlock the file") + } if (H5FD_lock(f->shared->lf, TRUE) < 0) { HGOTO_ERROR(H5E_FILE, H5E_CANTLOCKFILE, FAIL, "unable to lock the file") } + } /* Mark superblock as dirty */ if (H5F_super_dirty(f) < 0) |