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authorDana Robinson <derobins@hdfgroup.org>2020-08-14 19:35:07 (GMT)
committerDana Robinson <derobins@hdfgroup.org>2020-08-14 19:35:07 (GMT)
commit039213d919c0bcb8f01805f34b9ff6889b06158f (patch)
treeb5c2158184ccb0c9556a4d1f89931d210d9576ca /src/H5Fint.c
parentb8b219d19d158d272cd6b1037bbc8d6e3d64fc73 (diff)
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Brings file locking changes from develop
Diffstat (limited to 'src/H5Fint.c')
-rw-r--r--src/H5Fint.c202
1 files changed, 184 insertions, 18 deletions
diff --git a/src/H5Fint.c b/src/H5Fint.c
index eb023d6..29bbd45 100644
--- a/src/H5Fint.c
+++ b/src/H5Fint.c
@@ -77,6 +77,7 @@ static herr_t H5F__get_objects(const H5F_t *f, unsigned types, size_t max_index,
static int H5F__get_objects_cb(void *obj_ptr, hid_t obj_id, void *key);
static herr_t H5F__build_name(const char *prefix, const char *file_name, char **full_name/*out*/);
static char *H5F__getenv_prefix_name(char **env_prefix/*in,out*/);
+static herr_t H5F__check_if_using_file_locks(H5P_genplist_t *fapl, hbool_t *use_file_locking);
static herr_t H5F__build_actual_name(const H5F_t *f, const H5P_genplist_t *fapl, const char *name, char ** /*out*/ actual_name);
static herr_t H5F__flush_phase1(H5F_t *f);
static herr_t H5F__flush_phase2(H5F_t *f, hbool_t closing);
@@ -86,6 +87,15 @@ static herr_t H5F__flush_phase2(H5F_t *f, hbool_t closing);
/* Package Variables */
/*********************/
+/* Package initialization variable */
+hbool_t H5_PKG_INIT_VAR = FALSE;
+
+/* Based on the value of the HDF5_USE_FILE_LOCKING environment variable.
+ * TRUE/FALSE have obvious meanings. FAIL means the environment variable was
+ * not set, so the code should ignore it and use the fapl value instead.
+ */
+htri_t use_locks_env_g = FAIL;
+
/*****************************/
/* Library Private Variables */
@@ -102,6 +112,123 @@ H5FL_DEFINE(H5F_t);
/* Declare a free list to manage the H5F_shared_t struct */
H5FL_DEFINE(H5F_shared_t);
+/* File ID class */
+static const H5I_class_t H5I_FILE_CLS[1] = {{
+ H5I_FILE, /* ID class value */
+ 0, /* Class flags */
+ 0, /* # of reserved IDs for class */
+ (H5I_free_t)H5F__close_cb /* Callback routine for closing objects of this class */
+}};
+
+
+
+/*--------------------------------------------------------------------------
+NAME
+ H5F__init_package -- Initialize interface-specific information
+USAGE
+ herr_t H5F__init_package()
+RETURNS
+ Non-negative on success/Negative on failure
+DESCRIPTION
+ Initializes any interface-specific data or routines.
+
+--------------------------------------------------------------------------*/
+herr_t
+H5F__init_package(void)
+{
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_PACKAGE
+
+ /*
+ * Initialize the atom group for the file IDs.
+ */
+ if(H5I_register_type(H5I_FILE_CLS) < 0)
+ HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to initialize interface")
+
+ /* Check the file locking environment variable */
+ if(H5F__parse_file_lock_env_var(&use_locks_env_g) < 0)
+ HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to parse file locking environment variable")
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* H5F__init_package() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5F_term_package
+ *
+ * Purpose: Terminate this interface: free all memory and reset global
+ * variables to their initial values. Release all ID groups
+ * associated with this interface.
+ *
+ * Return: Success: Positive if anything was done that might
+ * have affected other interfaces;
+ * zero otherwise.
+ *
+ * Failure: Never fails
+ *
+ *-------------------------------------------------------------------------
+ */
+int
+H5F_term_package(void)
+{
+ int n = 0;
+
+ FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+ if(H5_PKG_INIT_VAR) {
+ if(H5I_nmembers(H5I_FILE) > 0) {
+ (void)H5I_clear_type(H5I_FILE, FALSE, FALSE);
+ n++; /*H5I*/
+ } /* end if */
+ else {
+ /* Make certain we've cleaned up all the shared file objects */
+ H5F_sfile_assert_num(0);
+
+ /* Destroy the file object id group */
+ n += (H5I_dec_type_ref(H5I_FILE) > 0);
+
+ /* Mark closed */
+ if(0 == n)
+ H5_PKG_INIT_VAR = FALSE;
+ } /* end else */
+ } /* end if */
+
+ FUNC_LEAVE_NOAPI(n)
+} /* end H5F_term_package() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5F__parse_file_lock_env_var
+ *
+ * Purpose: Parses the HDF5_USE_FILE_LOCKING environment variable.
+ *
+ * NOTE: This is done in a separate function so we can call it from
+ * the test code.
+ *
+ * Return: SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5F__parse_file_lock_env_var(htri_t *use_locks)
+{
+ char *lock_env_var = NULL; /* Environment variable pointer */
+
+ FUNC_ENTER_PACKAGE_NOERR
+
+ /* Check the file locking environment variable */
+ lock_env_var = HDgetenv("HDF5_USE_FILE_LOCKING");
+ if(lock_env_var && (!HDstrcmp(lock_env_var, "FALSE") || !HDstrcmp(lock_env_var, "0")))
+ *use_locks = FALSE; /* Override: Never use locks */
+ else if(lock_env_var && (!HDstrcmp(lock_env_var, "TRUE") || !HDstrcmp(lock_env_var, "BEST_EFFORT") || !HDstrcmp(lock_env_var, "1")))
+ *use_locks = TRUE; /* Override: Always use locks */
+ else
+ *use_locks = FAIL; /* Environment variable not set, or not set correctly */
+
+ FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5F__parse_file_lock_env_var() */
/*-------------------------------------------------------------------------
@@ -1334,6 +1461,52 @@ H5F__dest(H5F_t *f, hbool_t flush)
/*-------------------------------------------------------------------------
+ * Function: H5F__check_if_using_file_locks
+ *
+ * Purpose: Determines if this file will use file locks.
+ *
+ * There are three ways that file locking can be controlled:
+ *
+ * 1) The configure/cmake option that sets the H5_USE_FILE_LOCKING
+ * symbol (which is used as the default fapl value).
+ *
+ * 2) The H5Pset_file_locking() API call, which will override
+ * the configuration default.
+ *
+ * 3) The HDF5_USE_FILE_LOCKING environment variable, which overrides
+ * everything above.
+ *
+ * The main reason to disable file locking is to prevent errors on file
+ * systems where locking is not supported or has been disabled (as is
+ * often the case in parallel file systems).
+ *
+ * Return: SUCCEED/FAIL
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5F__check_if_using_file_locks(H5P_genplist_t *fapl, hbool_t *use_file_locking)
+{
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_STATIC
+
+ /* Make sure the out parameter has a value */
+ *use_file_locking = TRUE;
+
+ /* Check the fapl property */
+ if(H5P_get(fapl, H5F_ACS_USE_FILE_LOCKING_NAME, use_file_locking) < 0)
+ HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get use file locking flag")
+
+ /* Check the environment variable */
+ if(use_locks_env_g != FAIL)
+ *use_file_locking = (use_locks_env_g == TRUE) ? TRUE : FALSE;
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5F__check_if_using_file_locks() */
+
+
+/*-------------------------------------------------------------------------
* Function: H5F_open
*
* Purpose: Opens (or creates) a file. This function understands the
@@ -1422,8 +1595,7 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
hbool_t set_flag = FALSE; /*set the status_flags in the superblock */
hbool_t clear = FALSE; /*clear the status_flags */
hbool_t evict_on_close; /* evict on close value from plist */
- char *lock_env_var = NULL;/*env var pointer */
- hbool_t use_file_locking; /*read from env var */
+ hbool_t use_file_locking = TRUE; /* Using file locks? */
hbool_t ci_load = FALSE; /* whether MDC ci load requested */
hbool_t ci_write = FALSE; /* whether MDC CI write requested */
H5F_t *ret_value = NULL; /*actual return value */
@@ -1441,15 +1613,13 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
if(NULL == (drvr = H5FD_get_class(fapl_id)))
HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "unable to retrieve VFL class")
- /* Check the environment variable that determines if we care
- * about file locking. File locking should be used unless explicitly
- * disabled.
- */
- lock_env_var = HDgetenv("HDF5_USE_FILE_LOCKING");
- if(lock_env_var && !HDstrcmp(lock_env_var, "FALSE"))
- use_file_locking = FALSE;
- else
- use_file_locking = TRUE;
+ /* Get the file access property list, for future queries */
+ if(NULL == (a_plist = (H5P_genplist_t *)H5I_object(fapl_id)))
+ HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not file access property list")
+
+ /* Check if we are using file locking */
+ if (H5F__check_if_using_file_locks(a_plist, &use_file_locking) < 0)
+ HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "unable to get file locking flag")
/*
* Opening a file is a two step process. First we try to open the
@@ -1540,8 +1710,8 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
if(H5FD_lock(lf, (hbool_t)((flags & H5F_ACC_RDWR) ? TRUE : FALSE)) < 0) {
/* Locking failed - Closing will remove the lock */
if(H5FD_close(lf) < 0)
- HDONE_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to close low-level file info")
- HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to lock the file")
+ HDONE_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, NULL, "unable to close low-level file info")
+ HGOTO_ERROR(H5E_FILE, H5E_CANTLOCKFILE, NULL, "unable to lock the file")
} /* end if */
/* Create the 'top' file structure */
@@ -1573,10 +1743,6 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
shared = file->shared;
lf = shared->lf;
- /* Get the file access property list, for future queries */
- if(NULL == (a_plist = (H5P_genplist_t *)H5I_object(fapl_id)))
- HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not file access property list")
-
/* Check if page buffering is enabled */
if(H5P_get(a_plist, H5F_ACS_PAGE_BUFFER_SIZE_NAME, &page_buf_size) < 0)
HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "can't get page buffer size")
@@ -1715,7 +1881,7 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
/* Remove the file lock for SWMR_WRITE */
if(use_file_locking && (H5F_INTENT(file) & H5F_ACC_SWMR_WRITE)) {
if(H5FD_unlock(file->shared->lf) < 0)
- HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to unlock the file")
+ HGOTO_ERROR(H5E_FILE, H5E_CANTUNLOCKFILE, NULL, "unable to unlock the file")
} /* end if */
} /* end if */
else { /* H5F_ACC_RDONLY: check consistency of status_flags */