NAME
pthread_create —
create a new thread
SYNOPSIS
#include
<pthread.h>
int
pthread_create(pthread_t
*thread, const
pthread_attr_t *attr,
void *(*start_routine)(void
*), void *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. If the attributes specified by
attr are modified later, the thread's attributes are
not affected. 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() will fail if:
- [
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.
- [
EINVAL] - The value specified by attr is invalid.
SEE ALSO
__tfork(3), pthread_attr_init(3), pthread_attr_setdetachstate(3), pthread_attr_setguardsize(3), pthread_attr_setstack(3), pthread_attr_setstackaddr(3), pthread_attr_setstacksize(3), pthread_cleanup_pop(3), pthread_cleanup_push(3), pthread_exit(3), pthread_join(3)
STANDARDS
pthread_create() conforms to
ISO/IEC 9945-1:1996 (“POSIX.1”).