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.

     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 cre-
     ated 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.  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_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'').

NetBSD 6.0.1                     July 9, 2010                     NetBSD 6.0.1