diff options
Diffstat (limited to 'src/H5FDdirect.c')
| -rw-r--r-- | src/H5FDdirect.c | 78 |
1 files changed, 74 insertions, 4 deletions
diff --git a/src/H5FDdirect.c b/src/H5FDdirect.c index 3aa1c4f..a5a8426 100644 --- a/src/H5FDdirect.c +++ b/src/H5FDdirect.c @@ -147,6 +147,9 @@ static herr_t H5FD_direct_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, ha static herr_t H5FD_direct_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr, size_t size, const void *buf); static herr_t H5FD_direct_truncate(H5FD_t *_file, hid_t dxpl_id, hbool_t closing); +static herr_t H5FD_direct_lock(H5FD_t *_file, hbool_t rw); +static herr_t H5FD_direct_unlock(H5FD_t *_file); + static const H5FD_class_t H5FD_direct_g = { "direct", /*name */ @@ -177,10 +180,10 @@ static const H5FD_class_t H5FD_direct_g = { H5FD_direct_read, /*read */ H5FD_direct_write, /*write */ NULL, /*flush */ - H5FD_direct_truncate, /*truncate */ - NULL, /*lock */ - NULL, /*unlock */ - H5FD_FLMAP_DICHOTOMY /*fl_map */ + H5FD_direct_truncate, /*truncate */ + H5FD_direct_lock, /*lock */ + H5FD_direct_unlock, /*unlock */ + H5FD_FLMAP_DICHOTOMY /*fl_map */ }; /* Declare a free list to manage the H5FD_direct_t struct */ @@ -1342,5 +1345,72 @@ H5FD_direct_truncate(H5FD_t *_file, hid_t UNUSED dxpl_id, hbool_t UNUSED closing done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5FD_direct_truncate() */ + + +/*------------------------------------------------------------------------- + * Function: H5FD_direct_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_direct_lock(H5FD_t *_file, hbool_t rw) +{ + H5FD_direct_t *file = (H5FD_direct_t*)_file; /* VFD file struct */ + int lock; /* The type of lock */ + herr_t ret_value = SUCCEED; /* Return value */ + + FUNC_ENTER_NOAPI_NOINIT + + HDassert(file); + + /* Determine the type of lock */ + int 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") + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_direct_lock() */ + + +/*------------------------------------------------------------------------- + * Function: H5FD_direct_unlock + * + * Purpose: To remove the existing lock on the file + * + * Return: SUCCEED/FAIL + * + * Programmer: Vailin Choi; May 2013 + * + *------------------------------------------------------------------------- + */ +static herr_t +H5FD_direct_unlock(H5FD_t *_file) +{ + H5FD_direct_t *file = (H5FD_direct_t*)_file; /* VFD file struct */ + herr_t ret_value = SUCCEED; /* Return value */ + + FUNC_ENTER_NOAPI_NOINIT + + HDassert(file); + + if(HDflock(file->fd, LOCK_UN) < 0) + HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "unable to flock (unlock) file") + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_direct_unlock() */ + #endif /* H5_HAVE_DIRECT */ |