diff options
Diffstat (limited to 'src/H5FDsec2.c')
| -rw-r--r-- | src/H5FDsec2.c | 73 |
1 files changed, 71 insertions, 2 deletions
diff --git a/src/H5FDsec2.c b/src/H5FDsec2.c index 34527df..bb8f004 100644 --- a/src/H5FDsec2.c +++ b/src/H5FDsec2.c @@ -97,6 +97,7 @@ typedef struct H5FD_sec2_t { * a single file. */ hbool_t fam_to_sec2; + } H5FD_sec2_t; /* @@ -137,6 +138,8 @@ static herr_t H5FD_sec2_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, hadd static herr_t H5FD_sec2_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_sec2_truncate(H5FD_t *_file, hid_t dxpl_id, hbool_t closing); +static herr_t H5FD_sec2_lock(H5FD_t *_file, hbool_t rw); +static herr_t H5FD_sec2_unlock(H5FD_t *_file); static const H5FD_class_t H5FD_sec2_g = { "sec2", /* name */ @@ -168,8 +171,8 @@ static const H5FD_class_t H5FD_sec2_g = { H5FD_sec2_write, /* write */ NULL, /* flush */ H5FD_sec2_truncate, /* truncate */ - NULL, /* lock */ - NULL, /* unlock */ + H5FD_sec2_lock, /* lock */ + H5FD_sec2_unlock, /* unlock */ H5FD_FLMAP_DICHOTOMY /* fl_map */ }; @@ -901,3 +904,69 @@ done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5FD_sec2_truncate() */ + +/*------------------------------------------------------------------------- + * Function: H5FD_sec2_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_sec2_lock(H5FD_t *_file, hbool_t rw) +{ + H5FD_sec2_t *file = (H5FD_sec2_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 */ + 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_sec2_lock() */ + + +/*------------------------------------------------------------------------- + * Function: H5FD_sec2_unlock + * + * Purpose: To remove the existing lock on the file + * + * Return: SUCCEED/FAIL + * + * Programmer: Vailin Choi; May 2013 + * + *------------------------------------------------------------------------- + */ +static herr_t +H5FD_sec2_unlock(H5FD_t *_file) +{ + H5FD_sec2_t *file = (H5FD_sec2_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_sec2_unlock() */ + |