pthread_attr_getcpu_np.3

rtlinux-3.1源代码

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.TH "pthread_attr_getcpu_np" "3" 
.SH "NAME" 
pthread_attr_setcpu_np, pthread_attr_getcpu_nppthread_attr_getcpu_np \(em examine and change the CPU pthread attribute 
.SH "SYNOPSIS" 
.PP 
.nf 
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#include <rtl_sched.h> 
 
int \fBpthread_attr_setcpu_np\fP(pthread_attr_t \fB*attr\fR, int \fBcpu\fR); 
int \fBpthread_attr_getcpu_np\fP(pthread_attr_t \fB*attr\fR, int \fB*cpu\fR); 
.fi 
.SH "DESCRIPTION" 
.PP 
These functions are non-portable RTLinux extensions.  On SMP machines they allow a thread to be scheduled on a specific CPU. 
The RTLinux scheduler 
does not try to guess what thread belongs to what CPU. The default 
processor is the processor where a thread is created, 
but RTLinux really wants the 
application to tell it where to run threads. 
.PP 
\fBpthread_attr_setcpu_np\fP modifies the thread attribute object \fIattribute\fP so that the created thread would be scheduled on the CPU with id \fIcpu\fP (as displayed in \fI/proc/cpuinfo\fP).  The thread attribute object \fIattr\fP first has to be initialized with \fBpthread_attr_init(3)\fP. 
.PP 
\fBpthread_attr_getcpu_np\fP fills the location pointed to by \fBcpu\fR with the CPU id from the attribute structure. 
.SH "RETURN VALUE" 
.PP 
All functions return 0 on success and a non-zero error code on error. 
.SH "ERRORS" 
.PP 
\fBpthread_attr_setcpu_np\fP returns \fIEINVAL\fP if the specified CPU does not exist in the system. 
.SH "NOTES" 
.PP 
If \fBpthread_attr_setcpu_np\fP was not used on the attribute object passed to \fBpthread_create\fP, the thread is scheduled on the current CPU. 
.SH "AUTHOR" 
.PP 
Michael Barabanov (\[e-mail] (link to URL mailto:[e-mail]) \fR) 
.SH "SEE ALSO" 
\fIUNIX spec pthread_attr_getstacksize(3) (link to URL ../susv2/xsh/pthread_attr_getstacksize.html) \fR, \fIUNIX spec pthread_attr_setstacksize(3) (link to URL ../susv2/xsh/pthread_attr_setstacksize.html) \fR, \fIUNIX spec pthread_attr_setschedparam(3) (link to URL ../susv2/xsh/pthread_attr_setschedparam.html) \fR, \fIUNIX spec pthread_attr_init(3) (link to URL ../susv2/xsh/pthread_attr_init.html) \fR, \fIUNIX spec pthread_attr_getschedparam(3) (link to URL ../susv2/xsh/pthread_attr_getschedparam.html) \fR, \fIUNIX spec pthread_create(3) (link to URL ../susv2/xsh/pthread_create.html) \fR 
.PP 
\(co2001 FSMLabs Inc. 
.PP 
All rights reserved. 
...\" created by instant / docbook-to-man, Thu 26 Jul 2001, 11:19