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80 lines
2.1 KiB
Groff
80 lines
2.1 KiB
Groff
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.TH PTHREAD_SETSCHEDPARAM 3 LinuxThreads
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.XREF pthread_getschedparam
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.SH NAME
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pthread_setschedparam, pthread_getschedparam \- control thread scheduling parameters
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.SH SYNOPSIS
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#include <pthread.h>
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int pthread_setschedparam(pthread_t target_thread, int policy, const struct sched_param *param);
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int pthread_getschedparam(pthread_t target_thread, int *policy, struct sched_param *param);
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.SH DESCRIPTION
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!pthread_setschedparam! sets the scheduling parameters for the thread
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|target_thread| as indicated by |policy| and |param|. |policy| can be
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either !SCHED_OTHER! (regular, non-realtime scheduling), !SCHED_RR!
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(realtime, round-robin) or !SCHED_FIFO! (realtime, first-in
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first-out). |param| specifies the scheduling priority for the two
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realtime policies. See !sched_setpolicy!(2) for more information on
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scheduling policies.
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The realtime scheduling policies !SCHED_RR! and !SCHED_FIFO! are
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available only to processes with superuser privileges.
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!pthread_getschedparam! retrieves the scheduling policy and scheduling
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parameters for the thread |target_thread| and store them in the
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locations pointed to by |policy| and |param|, respectively.
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.SH "RETURN VALUE"
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!pthread_setschedparam! and !pthread_getschedparam! return 0 on
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success and a non-zero error code on error.
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.SH ERRORS
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On error, !pthread_setschedparam! returns the following error codes:
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.RS
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.TP
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!EINVAL!
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|policy| is not one of !SCHED_OTHER!, !SCHED_RR!, !SCHED_FIFO!
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.TP
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!EINVAL!
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the priority value specified by |param| is not valid for the specified policy
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.TP
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!EPERM!
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the calling process does not have superuser permissions
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.TP
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!ESRCH!
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the |target_thread| is invalid or has already terminated
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.TP
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!EFAULT!
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|param| points outside the process memory space
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.RE
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On error, !pthread_getschedparam! returns the following error codes:
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.RS
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.TP
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!ESRCH!
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the |target_thread| is invalid or has already terminated
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.TP
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!EFAULT!
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|policy| or |param| point outside the process memory space
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.RE
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.SH AUTHOR
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Xavier Leroy <Xavier.Leroy@inria.fr>
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.SH "SEE ALSO"
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!sched_setscheduler!(2),
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!sched_getscheduler!(2),
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!sched_getparam!(2),
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!pthread_attr_setschedpolicy!(3),
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!pthread_attr_setschedparam!(3).
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