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PTHREAD(3)			   BSD Library Functions Manual 		       PTHREAD(3)

     pthread -- POSIX Threads Library

     POSIX Threads Library (libpthread, -lpthread)

     #include <pthread.h>

     cc [flags] files -lpthread [libraries]

     The pthread library provides an implementation of the standard POSIX threads library.

     The NetBSD implementation is based on 1:1 thread model, therefore each pthread has a kernel
     thread, called a light-weight process (LWP).

     Note that the system private thread interfaces upon which the pthread library is built are
     subject to change without notice.	In order to remain compatible with future NetBSD
     releases, programs must be linked against the dynamic version of the thread library.  Stati-
     cally linked programs using the POSIX threads framework may not work when run on a future
     version of the system.

     The following functions comprise the core of the pthread library:

	   Function			 Description
	   pthread_attr(3)		 thread attribute operations
	   pthread_barrier_destroy(3)	 destroy a barrier
	   pthread_barrier_init(3)	 create a barrier
	   pthread_barrier_wait(3)	 wait for a barrier
	   pthread_barrierattr(3)	 barrier attribute operations
	   pthread_cancel(3)		 cancel the execution of a thread
	   pthread_cleanup_push(3)	 add or remove cleanup functions
	   pthread_cond_broadcast(3)	 unblock one or more threads
	   pthread_cond_destroy(3)	 destroy a condition variable
	   pthread_cond_init(3) 	 create a condition variable
	   pthread_cond_wait(3) 	 wait for a condition variable
	   pthread_condattr(3)		 condition attribute operations
	   pthread_create(3)		 create a new thread
	   pthread_detach(3)		 detach a thread
	   pthread_equal(3)		 compare thread identifiers
	   pthread_exit(3)		 terminate the calling thread
	   pthread_getspecific(3)	 get a thread-specific data value
	   pthread_join(3)		 wait for thread termination
	   pthread_key_create(3)	 thread-specific data key creation
	   pthread_key_delete(3)	 delete a thread-specific data key
	   pthread_kill(3)		 send a signal to a specific thread
	   pthread_mutex_destroy(3)	 free a mutex
	   pthread_mutex_init(3)	 create a mutex
	   pthread_mutex_lock(3)	 acquire a lock on a mutex
	   pthread_mutex_unlock(3)	 unlock a mutex
	   pthread_mutexattr(3) 	 mutex attribute operations
	   pthread_once(3)		 dynamic package initialization
	   pthread_rwlock_destroy(3)	 destroy a read/write lock
	   pthread_rwlock_init(3)	 initialize a read/write lock
	   pthread_rwlock_rdlock(3)	 acquire a read/write lock for reading
	   pthread_rwlock_unlock(3)	 release a read/write lock
	   pthread_rwlock_wrlock(3)	 acquire a read/write lock for writing
	   pthread_rwlockattr(3)	 read/write lock attribute operations
	   pthread_schedparam(3)	 thread scheduling manipulation
	   pthread_self(3)		 get the ID of the calling thread
	   pthread_setspecific(3)	 get a thread-specific data value
	   pthread_sigmask(3)		 manipulate a thread's signal mask
	   pthread_spin_destroy(3)	 destroy a spin lock
	   pthread_spin_init(3) 	 initialize a spin lock
	   pthread_spin_lock(3) 	 acquire a spin lock
	   pthread_spin_unlock(3)	 release a spin lock
	   pthread_testcancel(3)	 set cancelability state

     The following environment variables affect the behavior of the library:

	  Possible values are any combinations of:

	   A   Report errors to application by error return, but do not abort.
	   a   Abort on errors, creating a core dump for further debugging.
	   E   Do not log errors to stdout.
	   e   Log errors to stdout.
	   L   Do not log errors via syslogd(8).
	   l   Log errors via syslogd(8).

	  If not set in the environment, the pthread library behaves as if AEL has been speci-

	  Integer value giving the stack size in kilobytes.  This allows to set a smaller stack
	  size than the default stack size.  The default stack size is the current limit on the
	  stack size as set with the shell's command to change limits (limit for csh(1), or
	  ulimit for sh(1)).

     David R. Butenhof, Programming with POSIX(R) Threads, Addison-Wesley, 1997.

     The pthread library conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

     Due to limitations in the current pthread implementation, makecontext(3) and sigaltstack(2)
     should not be used in programs which link against the pthread library (whether threads are
     used or not).

BSD					   May 16, 2010 				      BSD
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