diff options
Diffstat (limited to 'src/H5FDcore.c')
| -rw-r--r-- | src/H5FDcore.c | 90 |
1 files changed, 82 insertions, 8 deletions
diff --git a/src/H5FDcore.c b/src/H5FDcore.c index 17ec07c..f4aa240 100644 --- a/src/H5FDcore.c +++ b/src/H5FDcore.c @@ -141,6 +141,8 @@ static herr_t H5FD__core_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, ha size_t size, const void *buf); static herr_t H5FD__core_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing); static herr_t H5FD__core_truncate(H5FD_t *_file, hid_t dxpl_id, hbool_t closing); +static herr_t H5FD_core_lock(H5FD_t *_file, hbool_t rw); +static herr_t H5FD_core_unlock(H5FD_t *_file); static const H5FD_class_t H5FD_core_g = { "core", /* name */ @@ -172,8 +174,8 @@ static const H5FD_class_t H5FD_core_g = { H5FD__core_write, /* write */ H5FD__core_flush, /* flush */ H5FD__core_truncate, /* truncate */ - NULL, /* lock */ - NULL, /* unlock */ + H5FD_core_lock, /* lock */ + H5FD_core_unlock, /* unlock */ H5FD_FLMAP_DICHOTOMY /* fl_map */ }; @@ -1016,12 +1018,12 @@ H5FD__core_query(const H5FD_t * _file, unsigned long *flags /* out */) /* Set the VFL feature flags that this driver supports */ if(flags) { *flags = 0; - *flags |= H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */ - *flags |= H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes */ - *flags |= H5FD_FEAT_DATA_SIEVE; /* OK to perform data sieving for faster raw data reads & writes */ - *flags |= H5FD_FEAT_AGGREGATE_SMALLDATA; /* OK to aggregate "small" raw data allocations */ - *flags |= H5FD_FEAT_ALLOW_FILE_IMAGE; /* OK to use file image feature with this VFD */ - *flags |= H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS; /* OK to use file image callbacks with this VFD */ + *flags |= H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */ + *flags |= H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes */ + *flags |= H5FD_FEAT_DATA_SIEVE; /* OK to perform data sieving for faster raw data reads & writes */ + *flags |= H5FD_FEAT_AGGREGATE_SMALLDATA; /* OK to aggregate "small" raw data allocations */ + *flags |= H5FD_FEAT_ALLOW_FILE_IMAGE; /* OK to use file image feature with this VFD */ + *flags |= H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS; /* OK to use file image callbacks with this VFD */ /* If the backing store is open, a POSIX file handle is available */ if(file && file->fd >= 0 && file->backing_store) @@ -1520,3 +1522,75 @@ done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5FD__core_truncate() */ + +/*------------------------------------------------------------------------- + * Function: H5FD_core_lock + * + * Purpose: To place an advisory lock on a file. + * The lock type to apply depends on the parameter "rw": + * TRUE--opens for write: an exclusive lock + * FALSE--opens for read: a shared lock + * + * Return: SUCCEED/FAIL + * + * Programmer: Vailin Choi; May 2013 + * + *------------------------------------------------------------------------- + */ +static herr_t +H5FD_core_lock(H5FD_t *_file, hbool_t rw) +{ + H5FD_core_t *file = (H5FD_core_t*)_file; /* VFD file struct */ + int lock; /* The type of lock */ + herr_t ret_value = SUCCEED; /* Return value */ + + FUNC_ENTER_NOAPI_NOINIT + + HDassert(file); + if(file->fd >= 0) { + + /* Determine the type of lock */ + lock = rw ? LOCK_EX : LOCK_SH; + + /* Place the lock with non-blocking */ + if(HDflock(file->fd, lock | LOCK_NB) < 0) + HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "unable to flock file") + } + /* Otherwise a noop */ + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_core_lock() */ + + +/*------------------------------------------------------------------------- + * Function: H5FD_core_unlock + * + * Purpose: To remove the existing lock on the file + * + * Return: SUCCEED/FAIL + * + * Programmer: Vailin Choi; May 2013 + * + *------------------------------------------------------------------------- + */ +static herr_t +H5FD_core_unlock(H5FD_t *_file) +{ + H5FD_core_t *file = (H5FD_core_t*)_file; /* VFD file struct */ + herr_t ret_value = SUCCEED; /* Return value */ + + FUNC_ENTER_NOAPI_NOINIT + + HDassert(file); + + if(file->fd >= 0) { + + if(HDflock(file->fd, LOCK_UN) < 0) + HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "unable to flock (unlock) file") + } + /* Otherwise a noop */ + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_core_unlock() */ |