freebsd-dev/lib/libpthread/man/pthread_create.3
Julian Elischer 0f7d684755 Submitted by: John Birrell <cimaxp1!jb@werple.net.au>
Here are the diffs for libc_r to get it one step closer to P1003.1c
These make most of the thread/mutex/condvar structures opaque to the
user. There are three functions which have been renamed with _np
suffixes because they are extensions to P1003.1c (I did them for JAVA,
which needs to suspend/resume threads and also start threads suspended).

I've created a new header (pthread_np.h) for the non-POSIX stuff.

The egrep tags stuff in /usr/src/lib/libc_r/Makefile that I uncommented
doesn't work. I think its best to delete it. I don't think libc_r needs
tags anyway, 'cause most of the source is in libc which does have tags.

also:

Here's the first batch of man pages for the thread functions.
The diff to /usr/src/lib/libc_r/Makefile removes some stuff that was
inherited from /usr/src/lib/libc/Makefile that should only be done with
libc.

also:

I should have sent this diff with the pthread(3) man page.
It allows people to type

make -DWANT_LIBC_R world

to get libc_r built with the rest of the world. I put this in the
pthread(3) man page.  The default is still not to build libc_r.


also:
The diff attached adds a pthread(3) man page to /usr/src/share/man/man3.
The idea is that without libc_r installed, this man page will give people
enough info to know that they have to build libc_r.
1996-08-20 08:22:01 +00:00

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3.7 KiB
Groff

.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
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.Dd April 4, 1996
.Dt PTHREAD_CREATE 3
.Os BSD 4
.Sh NAME
.Nm pthread_create
.Nd create a new thread
.Sh SYNOPSIS
.Fd #include <pthread.h>
.Ft int
.Fn pthread_create "pthread_t *thread" "const pthread_attr_t *attr" "void *(*start_routine)(void *)" "void *arg"
.Sh DESCRIPTION
The
.Fn pthread_create
function is used to create a new thread, with attributes specified by
.Fa attr ,
within a process. If
.Fa attr
is NULL, the default attributes are used. If the attributes specified by
.Fa attr
are modified later, the thread's attributes are not affected. Upon
successful completion
.Fn pthread_create
will store the ID of the created thread in the location specified by
.Fa thread .
.Pp
The thread is created executing
.Fa start_routine
with
.Fa arg
as its sole argument. If the
.Fa start_routine
returns, the effect is as if there was an implicit call to
.Fn pthread_exit
using the return value of
.Fa start_toutine
as the exit status. Note that the thread in which
.Fn main
was originally invoked differs from this. When it returns from
.Fn main ,
the effect is as if there was an implicit call to
.Fn exit using the return value of
.Fn main
as the exit status.
.Pp
The signal state of the new thread is initialized as:
.Bl -bullet -offset indent
.It
The signal mask is inherited from the creating thread.
.It
The set of signals pending for the new thread is empty.
.El
.Sh RETURN VALUES
If successful, the
.Fn pthread_create
function will return zero. Otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
.Fn pthread_create
will fail if:
.Bl -tag -width Er
.It Bq Er EAGAIN
The system lacked the necessary resources to create another thread, or
the system-imposed limit on the total number of threads in a process
[PTHREAD_THREADS_MAX] would be exceeded.
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.El
.Pp
.Sh SEE ALSO
.Xr pthread_exit 3 ,
.Xr pthread_join 3 ,
.Xr fork 2
.Sh STANDARDS
.Fn pthread_create
is expected to conform to IEEE
.Pq Dq Tn POSIX
Std 1003.1c when it is published.