hwlocality_creation

Section: Hardware Locality (hwloc) (3)
Updated: Thu Feb 11 2021
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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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