Required Capabilities

Some libpthread functions require the additional capabilities listed below:

Capability

Description

PowerMgmt

Grants the right:

to kill any process in the system

to power off unused peripherals

to switch the machine into standby state

to wake the machine up

to power the machine down completely.

For thread termination like pthread_exit() and pthread join(), PowerMgmt is required.
They are calling Rprocess::Terminate() internally.

Note that this does not control access to anything that might drain battery power.

The following functions require PowerMgmt capabilities:

pthread_create
pthread_detach
pthread_exit
pthread_getschedparam
pthread_getspecific
pthread_join
pthread_key_create
pthread_key_delete
pthread_setschedparam

ProtServ

Grants the right to a server to register with a protected name. Currently, protected names start with a "!" character. The kernel prevents servers without this capability from using such a name, and therefore prevents protected servers from being impersonated. The thread create case (pthread_create() ) needs ProtServ capability. It uses the User::SetCritical () API.

The following functions require ProtServ capabilities:

pthread_cond_broadcast
pthread_cond_destroy
pthread_cond_init
pthread_cond_signal
pthread_cond_timedwait
pthread_cond_wait
pthread_create
pthread_detach
pthread_exit
pthread_getschedparam
pthread_getspecific
pthread_join
pthread_key_create
pthread_key_delete
pthread_mutex_destroy
pthread_mutex_init
pthread_mutex_lock
pthread_mutex_timedlock
pthread_mutex_trylock
pthread_mutex_unlock
pthread_once
pthread_self
pthread_setschedparam
pthread_setspecific
sem_destroy
sem_init

Give feedback of this article

libpthread API Specification

Table of Contents

Required Capabilities