THR #include <pthread.h> int pthread_attr_getschedparam(const pthread_attr_t *restrictattr
, struct sched_param *restrictparam
); int pthread_attr_setschedparam(pthread_attr_t *restrictattr
, const struct sched_param *restrictparam
);
The pthread_attr_getschedparam() and pthread_attr_setschedparam() functions, respectively, shall get and set the scheduling parameter attributes in the attr argument. The contents of the param structure are defined in the <sched.h> header. For the SCHED_FIFO and SCHED_RR policies, the only required member of param is sched_priority.
TSP For the SCHED_SPORADIC policy, the required members of the param structure are sched_priority, sched_ss_low_priority, sched_ss_repl_period, sched_ss_init_budget, and sched_ss_max_repl. The specified sched_ss_repl_period must be greater than or equal to the specified sched_ss_init_budget for the function to succeed; if it is not, then the function shall fail. The value of sched_ss_max_repl shall be within the inclusive range [1,{SS_REPL_MAX}] for the function to succeed; if not, the function shall fail.
If successful, the pthread_attr_getschedparam() and pthread_attr_setschedparam() functions shall return zero; otherwise, an error number shall be returned to indicate the error.
The pthread_attr_setschedparam() function may fail if:
[EINVAL] | The value of param is not valid. |
[ENOTSUP] | An attempt was made to set the attribute to an unsupported value. |
These functions shall not return an error code of [EINTR].
After these attributes have been set, a thread can be created with the specified attributes using pthread_create(). Using these routines does not affect the current running thread.
pthread_attr_destroy(), pthread_attr_getscope(), pthread_attr_getinheritsched(), pthread_attr_getschedpolicy(), pthread_create(), the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
The pthread_attr_getschedparam() and pthread_attr_setschedparam() functions are marked as part of the Threads option.
The SCHED_SPORADIC scheduling policy is added for alignment with IEEE Std 1003.1d-1999.
The restrict keyword is added to the pthread_attr_getschedparam() and pthread_attr_setschedparam() prototypes for alignment with the ISO/IEC 9899:1999 standard.
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