"SCHED_SETSCHEDULER"(P) manual page

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POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

Name

sched_setscheduler - set scheduling policy and parameters +(REALTIME) +

Synopsis

#include <sched.h> +

int sched_setscheduler(pid_t pid, int policy, +const struct sched_param *param); +

Description

The sched_setscheduler function shall set the scheduling +policy and scheduling parameters of the process specified by pid +to policy and the parameters specified in the sched_param +structure pointed to by param, respectively. The value of the +sched_priority member in the sched_param structure +shall be any integer within the inclusive priority range for the +scheduling policy specified by policy. If the value of pid +is negative, the behavior of the sched_setscheduler function +is unspecified. +

The possible values for the policy parameter are defined in +the <sched.h> header. +

Pthreads-w32 only supports the SCHED_OTHER policy. +Any other value for policy will return failure with errno set +to ENOSYS. However, checks on pid and permissions are +performed first so that the other useful side effects of this routine +are retained.

If a process specified by pid exists, and if the calling +process has permission, the scheduling policy and scheduling +parameters shall be set for the process whose process ID is equal to +pid. +

If pid is zero, the scheduling policy and scheduling +parameters shall be set for the calling process. +

Implementations may require that the requesting process have +permission to set its own scheduling parameters or those of another +process. Additionally, implementation-defined restrictions may apply +as to the appropriate privileges required to set a process’ own +scheduling policy, or another process’ scheduling policy, to a +particular value. +

The sched_setscheduler function shall be considered +successful if it succeeds in setting the scheduling policy and +scheduling parameters of the process specified by pid to the +values specified by policy and the structure pointed to by +param, respectively. +

The effect of this function on individual threads is dependent on +the scheduling contention scope of the threads: +

* +: + For threads with system scheduling contention scope, these functions + shall have no effect on their scheduling. +
+ * +: + For threads with process scheduling contention scope, the threads’ + scheduling policy and associated parameters shall not be affected. + However, the scheduling of these threads with respect to threads in + other processes may be dependent on the scheduling parameters of + their process, which are governed using these functions. +

+This function is not atomic with respect to other threads in the +process. Threads may continue to execute while this function call is +in the process of changing the scheduling policy and associated +scheduling parameters for the underlying kernel-scheduled entities +used by the process contention scope threads. +

Return Value

Upon successful completion, the function shall return the former +scheduling policy of the specified process. If the sched_setscheduler +function fails to complete successfully, the policy and scheduling +parameters shall remain unchanged, and the function shall return a +value of -1 and set errno to indicate the error. +

Errors

The sched_setscheduler function shall fail if: +

EINVAL +: + The value of the policy parameter is invalid, or one or more + of the parameters contained in param is outside the valid + range for the specified scheduling policy. +
+ EPERM +: + The requesting process does not have permission to set either or + both of the scheduling parameters or the scheduling policy of the + specified process. +
+ ESRCH +: + No process can be found corresponding to that specified by pid. +

+The following sections are informative. +

Examples

None. +

Application Usage

None. +

Rationale

None. +

Future Directions

None. +

Copyright

Portions of this text are reprinted and reproduced in electronic +form from IEEE Std 1003.1, 2003 Edition, Standard for Information +Technology -- Portable Operating System Interface (POSIX), The Open +Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the +Institute of Electrical and Electronics Engineers, Inc and The Open +Group. In the event of any discrepancy between this version and the +original IEEE and The Open Group Standard, the original IEEE and The +Open Group Standard is the referee document. The original Standard +can be obtained online at http://www.opengroup.org/unix/online.html +. +

Modified by Ross Johnson for use with Pthreads-w32.

Table of Contents

Name +
+
Synopsis +
+
Description +
+
Return + Value +
+
Errors +
+
Examples +
+
Application + Usage +
+
Rationale +
+
Future + Directions +
+
See + Also +
+
Copyright +
+

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