pthread_create(3) [netbsd man page]

PTHREAD_CREATE(3)					   BSD 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 created thread in the location specified by thread.  The thread is cre-
     ated 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:

	   o   The signal mask is inherited from the creating thread.

	   o   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_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'').

BSD
								   July 9, 2010 							       BSD

PTHREAD_ATTR(3) 					   BSD Library Functions Manual 					   PTHREAD_ATTR(3)

NAME

     pthread_attr_init, pthread_attr_destroy -- thread attribute operations

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_attr_init(pthread_attr_t *attr);

     int
     pthread_attr_destroy(pthread_attr_t *attr);

DESCRIPTION

     Thread attributes are used to specify parameters to pthread_create().  One attribute object can be used in multiple calls to
     pthread_create(), with or without modifications between the calls.  The pthread_attr_t type is an opaque representation of the thread
     attributes; any access to the object other than via the described pthread_attr_*() functions may result in undefined behavior.

     The pthread_attr_init() function initializes attr with the default thread attributes used in the implementation.  Depending on the implemen-
     tation, undefined behavior may follow if an uninitialized thread attribute object is used with some of the thread attribute functions.  It is
     therefore a good practice to always use pthread_attr_init(), even if this might be unnecessary.  Undefined behavior may also follow if an
     already initialized attr is used with pthread_attr_init().

     When the attribute object is no longer needed, it should be destroyed by using pthread_attr_destroy().  The function has no effect on threads
     that were created by using a given attribute object.  A destroyed attr can be reinitialized using pthread_attr_init(), but all other actions
     with the destroyed object are unspecified.

     The following standard thread attribute functions are available:

	   Function			    Description
	   pthread_attr_getdetachstate(3)   thread detach state
	   pthread_attr_getguardsize(3)     thread guard size
	   pthread_attr_getinheritsched(3)  inherit scheduler attribute
	   pthread_attr_getschedparam(3)    thread scheduling parameter
	   pthread_attr_getschedpolicy(3)   thread scheduling policy
	   pthread_attr_getscope(3)	    thread contention scope
	   pthread_attr_getstack(3)	    thread stack
	   pthread_attr_getstacksize(3)     thread stack size
	   pthread_attr_getstackaddr(3)     thread stack address

     Each listed pthread_attr_get*() function contains a pthread_attr_set*() counterpart.  In addition, the following NetBSD specific extensions
     are available:

	   Function			    Description
	   pthread_attr_get_np(3)	    attributes of a running thread
	   pthread_attr_getname_np(3)	    descriptive name of an attribute

RETURN VALUES

     If successful, these functions return 0.  Otherwise, an error number is returned to indicate the error.

ERRORS

     No errors are defined for pthread_attr_init() and pthread_attr_destroy().

SEE ALSO

     pthread_create(3), pthread_join(3)

STANDARDS

     Both pthread_attr_init() and pthread_attr_destroy() conform to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD
								   July 9, 2010 							       BSD