NAME
pthread_create —
create a new
thread
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_create(
pthread_t
* restrict thread,
const
pthread_attr_t * restrict attr,
void *(*start_routine)(void
*),
void * restrict
arg);
DESCRIPTION
The
pthread_create() function is used to create a new thread,
with attributes specified by
attr, within a process. If
attr is
NULL
, the default
attributes are used.
The attributes specified via
attr are copied into the new
thread. Any subsequent modifications to the attributes object
attr points to will have no effect upon already-created
threads. It is thus also safe to pass the same
attr to
multiple calls to
pthread_create().
Upon successful completion
pthread_create() will store the ID
of the created thread in the location specified by
thread. The thread is created executing
start_routine with
arg as its sole
argument.
If the
start_routine returns, the effect is as if there
was an implicit call to
pthread_exit() using the return
value of
start_routine as the exit status. Note that the
thread in which
main() was originally invoked differs from
this. When it returns from
main(), the effect is as if there
was an implicit call to
exit() using the return value of
main() as the exit status.
The signal state of the new thread is initialized as:
- The signal mask is inherited from the creating
thread.
- The set of signals pending for the new thread is
empty.
RETURN VALUES
If successful, the
pthread_create() function will return zero.
Otherwise an error number will be returned to indicate the error.
ERRORS
pthread_create() shall fail if:
-
-
- [
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
PTHREAD_THREADS_MAX
would be
exceeded.
-
-
- [
EINVAL
]
- The value specified by attr is
invalid.
SEE ALSO
fork(2),
pthread_attr(3),
pthread_cleanup_pop(3),
pthread_cleanup_push(3),
pthread_exit(3),
pthread_join(3)
STANDARDS
The function conforms to
IEEE Std 1003.1-2001
(“POSIX.1”).