pthread_spin_destroy(3C)				   Standard C Library Functions 				  pthread_spin_destroy(3C)

NAME

       pthread_spin_destroy, pthread_spin_init - destroy or initialize a spin lock object

SYNOPSIS

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

       int pthread_spin_destroy(pthread_spinlock_t *lock);

       int pthread_spin_init(pthread_spinlock_t *lock, int pshared);

DESCRIPTION

       The  pthread_spin_destroy()  function  destroys	the spin lock referenced by lock and release any resources used by the lock. The effect of
       subsequent use of the lock is undefined until the lock is reinitialized by another call to pthread_spin_init(). The results  are  undefined
       if pthread_spin_destroy() is called when a thread holds the lock, or if this function is called with an uninitialized thread spin lock.

       The  pthread_spin_init()  function  allocates  any resources required to use the spin lock referenced by lock and initialize the lock to an
       unlocked state.

       If the Thread Process-Shared Synchronization option is supported and the value of pshared is PTHREAD_PROCESS_SHARED, the spin lock  can	be
       operated  upon  by  any	thread	that  has access to the memory where the spin lock is allocated, even if it is allocated in memory that is
       shared by multiple processes.

       If the Thread Process-Shared Synchronization option is supported and the value of pshared is PTHREAD_PROCESS_PRIVATE, or if the	option	is
       not  supported,	the spin lock can only be operated upon by threads created within the same process as the thread that initialized the spin
       lock. If threads of differing processes attempt to operate on such a spin lock, the behavior is undefined.

       The results are undefined if pthread_spin_init() is called specifying an already initialized spin lock. The results are undefined if a spin
       lock is used without first being initialized.

       If the pthread_spin_init() function fails, the lock is not initialized and the contents of lock are undefined.

       Only the object referenced by lock can be used for performing synchronization.

       The  result  of	referring to copies of that object in calls to pthread_spin_destroy(), pthread_spin_lock(3C), pthread_spin_trylock(3C), or
       pthread_spin_unlock(3C) is undefined.

RETURN VALUES

       Upon successful completion, these functions returns 0. Otherwise, an error number is returned to indicate the error.

ERRORS

       The pthread_spin_init() function will fail if:

       EAGAIN	 The system lacks the necessary resources to initialize another spin lock.

       These functions may fail if:

       EBUSY	 The system has detected an attempt to initialize or destroy a spin lock while it is in use (for example, while being  used  in  a
		 pthread_spin_lock() call) by another thread.

       EINVAL	 The value specified by lock 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_spin_lock(3C), pthread_spin_unlock(3C), attributes(5), standards(5)

SunOS 5.11							    30 Jan 2004 					  pthread_spin_destroy(3C)