PTHREAD_CREATE(3)         OpenBSD Programmer's Manual        PTHREAD_CREATE(3)

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 at-
     tributes specified by attr, within a process. If attr is NULL, the de-
     fault attributes are used. If the attributes specified by attr are modi-
     fied 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 argu-
     ment. If the start_routine returns, the effect is as if there was an im-
     plicit call to pthread_exit() using the return value of start_routine as
     the exit status. Note that the thread in which main() was originally in-
     voked 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 exceed-
                   ed.

     [EINVAL]      The value specified by attr is invalid.

SEE ALSO
     fork(2),  pthread_cleanup_pop(3),  pthread_cleanup_push(3),
     pthread_exit(3),  pthread_join(3)

STANDARDS
     pthread_create() conforms to ISO/IEC 9945-1 ANSI/IEEE (``POSIX'') Std
     1003.1 Second Edition 1996-07-12.

OpenBSD 2.6                      April 4, 1996                               1