pthread_cond_init(3C)					   Standard C Library Functions 				     pthread_cond_init(3C)

NAME

       pthread_cond_init, pthread_cond_destroy - initialize or destroy condition variables

SYNOPSIS

       cc -mt [ flag... ] file... -lpthread [ library... ]
       #include <pthread.h>

       int pthread_cond_init(pthread_cond_t *restrict cond,
	    const pthread_condattr_t *restrict attr);

       int pthread_cond_destroy(pthread_cond_t *cond

       pthread_cond_t cond= PTHREAD_COND_INITIALIZER;

DESCRIPTION

       The  function  pthread_cond_init()  initializes	the  condition	variable referenced by cond with attributes referenced by attr. If attr is
       NULL, the default condition variable attributes are used; the effect is the same as passing the address of  a  default  condition  variable
       attributes object. See pthread_condattr_init(3C). Upon successful initialization, the state of the condition variable becomes initialized.

       Attempting to initialize an already initialized condition variable results in undefined behavior.

       The  function pthread_cond_destroy() destroys the given condition variable specified by cond; the object becomes, in effect, uninitialized.
       An implementation may cause pthread_cond_destroy() to set the object referenced by cond to an invalid value. A destroyed condition variable
       object  can  be	re-initialized	using pthread_cond_init(); the results of otherwise referencing the object after it has been destroyed are
       undefined.

       It is safe to destroy an initialized condition variable upon which no threads are currently blocked.  Attempting  to  destroy  a  condition
       variable upon which other threads are currently blocked results in undefined behavior.

       In  cases where default condition variable attributes are appropriate, the macro  PTHREAD_COND_INITIALIZER can be used to initialize condi-
       tion variables that are statically allocated. The effect is equivalent to dynamic initialization by  a  call  to  pthread_cond_init()  with
       parameter attr specified as  NULL, except that no error checks are performed.

RETURN VALUES

       If  successful,	the pthread_cond_init() and pthread_cond_destroy() functions return  0. Otherwise, an error number is returned to indicate
       the error. The EBUSY and EINVAL error checks, if implemented, act as if they were performed immediately at the beginning of processing  for
       the function and caused an error return prior to modifying the state of the condition variable specified by cond.

ERRORS

       The  pthread_cond_init() function will fail if:

       EAGAIN	 The system lacked the necessary resources (other than memory) to initialize another condition variable.

       ENOMEM	 Insufficient memory exists to initialize the condition variable.

       The pthread_cond_init() function may fail if:

       EBUSY	 The  implementation has detected an attempt to re-initialize the object referenced by cond, a previously initialized, but not yet
		 destroyed, condition variable.

       EINVAL	 The value specified by attr is invalid.

       The pthread_cond_destroy() function may fail if:

       EBUSY	 The implementation has detected an attempt to destroy the object referenced by cond while it is referenced  (for  example,  while
		 being used in a pthread_cond_wait() or pthread_cond_timedwait()) by another thread.

       EINVAL	 The value specified by cond is invalid.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pthread_cond_signal(3C),    pthread_cond_broadcast(3C),	 pthread_cond_wait(3C),   pthread_cond_timedwait(3C),	pthread_condattr_init(3C),
       attributes(5), condition(5), standards(5)

SunOS 5.11							    23 Mar 2005 					     pthread_cond_init(3C)