.\" Copyright (c) 1996 John Birrell <email@example.com>. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by John Birrell. .\" 4. Neither the name of the author nor the names of any co-contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD: src/lib/libc_r/man/pthread_create.3,v 126.96.36.199 2001/08/17 15:42:51 ru Exp $ .\" .Dd April 4, 1996 .Dt PTHREAD_CREATE 3 .Os .Sh NAME .Nm pthread_create .Nd create a new thread .Sh SYNOPSIS .Fd #include <pthread.h> .Ft int .Fo pthread_create .Fa "pthread_t *restrict thread" .Fa "const pthread_attr_t *restrict attr" .Fa "void *(*start_routine)(void *)" .Fa "void *restrict arg" .Fc .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 Upon its creation, the thread executes .Fa start_routine , with .Fa arg as its sole argument. If .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_routine 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 .Sh SEE ALSO .Xr fork 2 , .Xr pthread_cleanup_pop 3 , .Xr pthread_cleanup_push 3 , .Xr pthread_exit 3 , .Xr pthread_join 3 .Sh STANDARDS .Fn pthread_create conforms to .St -p1003.1-96 .