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Copyright (c) 1996 John Birrell <jb (at] cimlogic.com.au>.
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$FreeBSD: src/lib/libpthread/man/pthread_create.3,v 1.16 2002/09/16 19:29:28 mini Exp $
.Dd July 9, 2010 .Dt PTHREAD_CREATE 3 .Os .Sh NAME .Nm pthread_create .Nd create a new thread .Sh LIBRARY .Lb libpthread .Sh SYNOPSIS n 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 .Dv NULL , the default attributes are used.
p The attributes specified via .Fa attr are copied into the new thread. Any subsequent modifications to the attributes object .Fa attr points to will have no effect upon already-created threads. It is thus also safe to pass the same .Fa attr to multiple calls to .Fn pthread_create .
p Upon successful completion .Fn pthread_create will store the ID of the created thread in the location specified by .Fa thread . The thread is created executing .Fa start_routine with .Fa arg as its sole argument.
p If the .Fa start_routine returns, the effect is as if there was an implicit call to .Xr pthread_exit 3 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 .Xr exit 3 using the return value of .Fn main as the exit status.
p The signal state of the new thread is initialized as: l -bullet -offset indent t The signal mask is inherited from the creating thread. t 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 shall fail if: l -tag -width Er t Bq Er EAGAIN The system lacks the necessary resources to create another thread, or the system-imposed limit on the total number of threads in a process .Dv PTHREAD_THREADS_MAX would be exceeded. t Bq Er EINVAL The value specified by .Fa attr is invalid. .El .Sh SEE ALSO .Xr fork 2 , .Xr pthread_attr 3 , .Xr pthread_cleanup_pop 3 , .Xr pthread_cleanup_push 3 , .Xr pthread_exit 3 , .Xr pthread_join 3 .Sh STANDARDS The function conforms to .St -p1003.1-2001 .
Indexes created Sat Sep 20 22:09:52 GMT 2025