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profile_create.md

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zx_profile_create

SUMMARY

Create a scheduler profile.

DECLARATION

#include <zircon/syscalls.h>

zx_status_t zx_profile_create(zx_handle_t root_job,
                              uint32_t options,
                              const zx_profile_info_t* profile,
                              zx_handle_t* out);

DESCRIPTION

zx_profile_create() creates a new profile object.

The parameter profile specifies the settings in the profile, which in turn will be applied to threads when zx_object_set_profile() is called. The fields of profile are shown below. options must be zero.

#define ZX_PROFILE_INFO_FLAG_PRIORITY (1 << 0)
#define ZX_PROFILE_INFO_FLAG_CPU_MASK (1 << 1)

typedef struct zx_profile_info {
  // A bitmask of ZX_PROFILE_INFO_FLAG_* values. Specifies which fields
  // below have been specified. Other fields are considered unset.
  uint32_t flags;

  // Scheduling priority. |flags| must have ZX_PROFILE_INFO_FLAG_PRIORITY set.
  int32_t priority;

  // CPUs that threads may be scheduled on. |flags| must have
  // ZX_PROFILE_INFO_FLAG_CPU_MASK set.
  zx_cpu_set_t cpu_affinity_mask;
} zx_profile_info_t;

The flags field specifies which fields in the zx_profile_info_t structure contain valid values. Values in fields without a corresponding flag bit set will be ignored. This allows fields with values of 0 and unset fields to be distinguished, even if additional fields are added in future.

Upon success a handle for the new profile is returned.

RIGHTS

root_job must be of type ZX_OBJ_TYPE_JOB and have ZX_RIGHT_MANAGE_PROCESS.

Caller job policy must allow ZX_POL_NEW_PROFILE.

RETURN VALUE

Returns ZX_OK and a handle to the new profile (via out) on success. In the event of failure, a negative error value is returned.

ERRORS

ZX_ERR_BAD_HANDLE root_job is not a valid handle.

ZX_ERR_WRONG_TYPE root_job is not a job handle.

ZX_ERR_ACCESS_DENIED root_job does not have ZX_RIGHT_MANAGE_PROCESS right, or root_job is not a handle to the root job.

ZX_ERR_INVALID_ARGS One or more of the arguments provided were invalid:

  • profile or out was an invalid pointer
  • flags contains an unknown option
  • options was not zero
  • priority was an invalid priority

ZX_ERR_NO_MEMORY Failure due to lack of memory.

SEE ALSO