pthread_create(3) - NetBSD Manual Pages

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PTHREAD_CREATE(3)       NetBSD Library Functions Manual      PTHREAD_CREATE(3)


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.  If the attribute object pointed to by attr
     are modified later, the thread's attributes are not affected.  Upon suc-
     cessful 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
     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.  Other-
     wise 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_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'').

NetBSD 5.1.2                   January 30, 2003                   NetBSD 5.1.2