Comtrol eCos - Manual (Page 465)

Chapter 31. POSIX Standard Support
Notes
• The functions sched_setparam(), sched_getparam(), sched_setscheduler() and sched_getscheduler() are present
but always return an error.
• The scheduler policy SCHED_OTHER is equivalent to SCHED_RR.
• Only PTHREAD_SCOPE_SYSTEM is supported as a contentionscope attribute.
• The default thread scheduling attributes are:
contentionscope PTHREAD_SCOPE_SYSTEM
inheritsched PTHREAD_INHERIT_SCHED
schedpolicy SCHED_OTHER
schedparam.sched 0
• Mutex priority inversion protection is controlled by a number of kernel configuration options.
If CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
is defined then {_POSIX_THREAD_PRIO_INHERIT} will be defined and
PTHREAD_PRIO_INHERIT may be set as the protocol in a pthread_mutexattr_t object. If
CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING is defined then
{_POSIX_THREAD_PRIO_PROTECT} will be defined and PTHREAD_PRIO_PROTECT may be set as the
protocol in a pthread_mutexattr_t object.
• The default attribute values set by pthread_mutexattr_init() is to set the protocol attribute to
PTHREAD_PRIO_NONE and the prioceiling attribute to zero.
Clocks and Timers [POSIX Section 14]
Functions Implemented
int clock_settime( clockid_t clock_id,
const struct timespec ∗ tp);
int clock_gettime( clockid_t clock_id, struct timespec ∗ tp);
int clock_getres( clockid_t clock_id, struct timespec ∗ tp);
int timer_create( clockid_t clock_id, struct sigevent ∗ evp,
timer_t ∗ timer_id);
int timer_delete( timer_t timer_id );
int timer_settime( timer_t timerid, int flags,
const struct itimerspec ∗ value,
struct itimerspec ∗ ovalue );
int timer_gettime( timer_t timerid, struct itimerspec ∗ value );
int timer_getoverrun( timer_t timerid );
int nanosleep( const struct timespec ∗ rqtp, struct timespec ∗ rmtp);
Functions Omitted
<none>
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