int sched_yield(void);
int sched_get_priority_max(int policy);
int sched_get_priority_min(int policy);
int sched_rr_get_interval(pid_t pid, struct timespec *t);
int pthread_attr_setscope(pthread_attr_t *attr, int scope);
int pthread_attr_getscope(const pthread_attr_t *attr, int *scope);
int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit);
int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit);
int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy);
int pthread_attr_setschedparam( pthread_attr_t *attr, const struct sched_param *param);
int pthread_attr_getschedparam( const pthread_attr_t *attr,
struct sched_param *param);
int pthread_setschedparam(pthread_t thread, int policy,
const struct sched_param *param);
int pthread_getschedparam(pthread_t thread, int *policy,
struct sched_param *param);
int pthread_mutexattr_setprotocol( pthread_mutexattr_t *attr,
int protocol);
int pthread_mutexattr_getprotocol( pthread_mutexattr_t *attr,
int *protocol);
int pthread_mutexattr_setprioceiling( pthread_mutexattr_t *attr,
int prioceiling);
int pthread_mutexattr_getprioceiling( pthread_mutexattr_t *attr,
int *prioceiling);
int pthread_mutex_setprioceiling( pthread_mutex_t *mutex,
int prioceiling,
int *old_ceiling);
int pthread_mutex_getprioceiling( pthread_mutex_t *mutex,
int *prioceiling); |
int sched_setparam(pid_t pid, const struct sched_param *param); int sched_getparam(pid_t pid, struct sched_param *param); int sched_setscheduler(pid_t pid, int policy, const struct sched_param *param); int sched_getscheduler(pid_t pid); |
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.