hwlocality_creation(3) Hardware Locality (hwloc) hwlocality_creation(3)
NAME
hwlocality_creation - Topology Creation and Destruction
SYNOPSIS
Typedefs
typedef struct hwloc_topology * hwloc_topology_t
Functions
int hwloc_topology_init (hwloc_topology_t *topologyp)
int hwloc_topology_load (hwloc_topology_t topology)
void hwloc_topology_destroy (hwloc_topology_t topology)
int hwloc_topology_dup (hwloc_topology_t *newtopology, hwloc_topology_t
oldtopology)
int hwloc_topology_abi_check (hwloc_topology_t topology)
void hwloc_topology_check (hwloc_topology_t topology)
Detailed Description
Typedef Documentation
typedef struct hwloc_topology* hwloc_topology_t
Topology context. To be initialized with hwloc_topology_init() and
built with hwloc_topology_load().
Function Documentation
int hwloc_topology_abi_check (hwloc_topology_t topology)
Verify that the topology is compatible with the current hwloc library.
This is useful when using the same topology structure (in memory) in
different libraries that may use different hwloc installations (for
instance if one library embeds a specific version of hwloc, while
another library uses a default system-wide hwloc installation).
If all libraries/programs use the same hwloc installation, this
function always returns success.
Returns
0 on success.
-1 with errno set to EINVAL if incompatible.
Note
If sharing between processes with hwloc_shmem_topology_write(), the
relevant check is already performed inside
hwloc_shmem_topology_adopt().
void hwloc_topology_check (hwloc_topology_t topology)
Run internal checks on a topology structure. The program aborts if an
inconsistency is detected in the given topology.
Parameters
topology is the topology to be checked
Note
This routine is only useful to developers.
The input topology should have been previously loaded with
hwloc_topology_load().
void hwloc_topology_destroy (hwloc_topology_t topology)
Terminate and free a topology context.
Parameters
topology is the topology to be freed
int hwloc_topology_dup (hwloc_topology_t * newtopology, hwloc_topology_t
oldtopology)
Duplicate a topology. The entire topology structure as well as its
objects are duplicated into a new one.
This is useful for keeping a backup while modifying a topology.
Note
Object userdata is not duplicated since hwloc does not know what it
point to. The objects of both old and new topologies will point to
the same userdata.
int hwloc_topology_init (hwloc_topology_t * topologyp)
Allocate a topology context.
Parameters
topologyp is assigned a pointer to the new allocated context.
Returns
0 on success, -1 on error.
int hwloc_topology_load (hwloc_topology_t topology)
Build the actual topology. Build the actual topology once initialized
with hwloc_topology_init() and tuned with Topology Detection
Configuration and Query and Changing the Source of Topology Discovery
routines. No other routine may be called earlier using this topology
context.
Parameters
topology is the topology to be loaded with objects.
Returns
0 on success, -1 on error.
Note
On failure, the topology is reinitialized. It should be either
destroyed with hwloc_topology_destroy() or configured and loaded
again.
This function may be called only once per topology.
The binding of the current thread or process may temporarily change
during this call but it will be restored before it returns.
See also
Topology Detection Configuration and Query and Changing the Source
of Topology Discovery
Author
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