pthread_create.3

rtlinux-3.1源代码

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.TH "pthread_create" "3" 
.SH "NAME" 
pthread_create \(em create a thread 
.SH "SYNOPSIS" 
.PP 
.nf 
.ta 8n 16n 24n 32n 40n 48n 56n 64n 72n 
#include <rtl_sched.h> 
 
int \fBpthread_create\fP(pthread_t \fB*thread\fR, pthread_attr_t \fB*attr\fR, void *\fB(*start_routine)(void *)\fR, void \fB*arg\fR); 
.fi 
.SH "DESCRIPTION" 
.PP 
This function is an RTLinux version of standard POSIX threads function.  
\fBpthread_create\fP  creates a realtime thread  that 
will have attributes given by \fBattr\fR, and that begins executing  
function \fBstart_routine\fP(\fBarg \fR). If the attribute is NULL, 
default attributes are used. 
The thread attributes in RTLinux are extended to allow thread creation on specific 
processors (\fBpthread_attr_setcpu_np\fP), to enable FPU operations 
in the created thread (\fBpthread_attr_setfp_np\fP). 
.PP 
The standard thread attribute setting functions supported include 
\fBpthread_attr_setschedparam\fP, 
\fBpthread_attr_setdetachstate\fP, 
\fBpthread_attr_setstacksize\fP, 
\fBpthread_attr_setstackaddr\fP. 
The last call is to allow users to allocate memory for thread stacks 
-- so that threads can be 
created in RT operating mode by making use of pre-allocated memory. 
\fBpthread_join\fP should be used to synchronize freeing of  
thread resources including memory. For example if a thread is created with 
user allocated stack via \fBpthread_attr_setstackaddr\fP, that 
memory can only be safely reallocated after a \fBpthread_join\fP. 
.SH "RETURN VALUE" 
.PP 
\fBpthread_create\fP returns 0 on success and a non-zero error code on error. 
.SH "ERRORS" 
.IP "[EAGAIN]" 10 
Either not enough memory, or  
PTHREAD_THREADS_MAX would be exceeded, or pthread_create is called 
from RT-thread context and preallocated stack use is not specified. 
.IP " [EINVAL]" 10 
Bad attributes. 
.SH "AUTHOR" 
.PP 
Victor Yodaiken (\[e-mail] (link to URL mailto:[e-mail]) \fR) 
.SH "NOTES" 
.PP 
In the absense of preallocated stack (via \fBpthread_attr_setstackaddr\fP), the use of this function is restricted to the Linux 
\fBinit_module()\fP or \fBcleanup_module()\fP context. 
.SH "SEE ALSO" 
\fIUNIX spec pthread_create(3) (link to URL ../susv2/xsh/pthread_create.html) \fR, \fIpthread_attr_setstackaddr(3) (link to URL ../susv2/xsh/pthread_attr_getstackaddr.html) \fR, \fIpthread_attr_setstacksize(3) (link to URL ../susv2/xsh/pthread_attr_getstacksize.html) \fR, \fIpthread_join(3) (link to URL pthread_join.3.html) \fR, \fIpthread_make_periodic_np(3) (link to URL pthread_make_periodic_np.3.html) \fR, \fIpthread_attr_setcpu_np(3) (link to URL pthread_attr_setcpu_np.3.html) \fR, \fIpthread_attr_getcpu_np(3) (link to URL pthread_attr_getcpu_np.3.html) \fR, \fIpthread_attr_setfp_np(3) (link to URL pthread_attr_setfp_np.3.html) \fR 
.PP 
\(co2001 FSMLabs Inc. 
.PP 
All rights reserved. 
...\" created by instant / docbook-to-man, Thu 26 Jul 2001, 11:19