NAME
pthread_create —
create a new thread
LIBRARY
library “libpthread”
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
Thepthread_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_MAXwould 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”).