Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

pthread_attr_setinheritsched(3) [netbsd man page]


pthread_attr_getinheritedsched -- get and set ``inheritsched'' attribute LIBRARY
POSIX Threads Library (libpthread, -lpthread) SYNOPSIS
#include <pthread.h> int pthread_attr_getinheritsched(const pthread_attr_t * restrict attr, int * restrict inheritsched); int pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched); DESCRIPTION
The pthread_attr_getinheritsched() and pthread_attr_setinheritsched() functions get and set, respectively, the inherit scheduler attribute, inheritsched, in the attr object. The inheritsched parameter specifies whether a tread created by using attr will obtain its scheduling attributes directly from attr or whether it will inherit these from the calling thread. Two values are possible for inheritsched: PTHREAD_INHERIT_SCHED The thread scheduling attributes will be inherited from the creating thread and the ones in attr are ignored. PTHREAD_EXPLICIT_SCHED The thread scheduling attributes will be set to the corresponding values in attr. The following thread scheduling attributes are affected by inheritsched: o Scheduling policy; see pthread_attr_setschedpolicy(3). o Scheduling parameter; see pthread_attr_getschedparam(3). o Scheduling contention scope; see pthread_attr_getscope(3). RETURN VALUES
If successful, both functions return 0. Otherwise, an error number is returned to indicate the error. COMPATIBILITY
The standard leaves it unspecified which (if any) is the default inherit scheduler attribute in a newly initialized attribute object. ERRORS
No errors are defined for pthread_attr_getinheritsched(). The pthread_attr_setinheritsched() function may fail if: [EINVAL] The value specified by inheritsched is invalid. SEE ALSO
pthread_attr(3) STANDARDS
Both functions conform to IEEE Std 1003.1-2008 (``POSIX.1''). BSD
July 7, 2010 BSD

Check Out this Related Man Page


pthread_attr_setinheritsched, pthread_attr_getinheritsched - set/get inherit-scheduler attribute in thread attributes object SYNOPSIS
#include <pthread.h> int pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched); int pthread_attr_getinheritsched(pthread_attr_t *attr, int *inheritsched); Compile and link with -pthread. DESCRIPTION
The pthread_attr_setinheritsched() function sets the inherit-scheduler attribute of the thread attributes object referred to by attr to the value specified in inheritsched. The inherit-scheduler attribute determines whether a thread created using the thread attributes object attr will inherit its scheduling attributes from the calling thread or whether it will take them from attr. The following scheduling attributes are affected by the inherit-scheduler attribute: scheduling policy (pthread_attr_setschedpolicy(3)), scheduling priority (pthread_attr_setschedparam(3)), and contention scope (pthread_attr_setscope(3)). The following values may be specified in inheritsched: PTHREAD_INHERIT_SCHED Threads that are created using attr inherit scheduling attributes from the creating thread; the scheduling attributes in attr are ignored. PTHREAD_EXPLICIT_SCHED Threads that are created using attr take their scheduling attributes from the values specified by the attributes object. The default setting of the inherit-scheduler attribute in a newly initialized thread attributes object is PTHREAD_INHERIT_SCHED. The pthread_attr_getinheritsched() returns the inherit-scheduler attribute of the thread attributes object attr in the buffer pointed to by inheritsched. RETURN VALUE
On success, these functions return 0; on error, they return a nonzero error number. ERRORS
pthread_attr_setinheritsched() can fail with the following error: EINVAL Invalid value in inheritsched. POSIX.1-2001 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value") for pthread_attr_setinheritsched(). CONFORMING TO
POSIX.1-2001. BUGS
As at glibc 2.8, if a thread attributes object is initialized using pthread_attr_init(3), then the scheduling policy of the attributes object is set to SCHED_OTHER and the scheduling priority is set to 0. However, if the inherit-scheduler attribute is then set to PTHREAD_EXPLICIT_SCHED, then a thread created using the attribute object wrongly inherits its scheduling attributes from the creating thread. This bug does not occur if either the scheduling policy or scheduling priority attribute is explicitly set in the thread attributes object before calling pthread_create(3). EXAMPLE
See pthread_setschedparam(3). SEE ALSO
sched_setscheduler(2), pthread_attr_init(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3), pthread_attr_setscope(3), pthread_create(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2013-04-19 PTHREAD_ATTR_SETINHERITSCHED(3)
Man Page