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authorRoland McGrath <roland@gnu.org>2005-07-03 04:40:34 +0000
committerRoland McGrath <roland@gnu.org>2005-07-03 04:40:34 +0000
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-.TH PTHREAD_MUTEXATTR 3 LinuxThreads
-
-.XREF pthread_mutexattr_destroy
-.XREF pthread_mutexattr_settype
-.XREF pthread_mutexattr_gettype
-
-.SH NAME
-pthread_mutexattr_init, pthread_mutexattr_destroy, pthread_mutexattr_settype, pthread_mutexattr_gettype \- mutex creation attributes
-
-.SH SYNOPSIS
-#include <pthread.h>
-
-int pthread_mutexattr_init(pthread_mutexattr_t *attr);
-
-int pthread_mutexattr_destroy(pthread_mutexattr_t *attr);
-
-int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int kind);
-
-int pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *kind);
-
-.SH DESCRIPTION
-
-Mutex attributes can be specified at mutex creation time, by passing a
-mutex attribute object as second argument to !pthread_mutex_init!(3).
-Passing !NULL! is equivalent to passing a mutex attribute object with
-all attributes set to their default values.
-
-!pthread_mutexattr_init! initializes the mutex attribute object |attr|
-and fills it with default values for the attributes.
-
-!pthread_mutexattr_destroy! destroys a mutex attribute object, which
-must not be reused until it is reinitialized. !pthread_mutexattr_destroy!
-does nothing in the LinuxThreads implementation. 
-
-LinuxThreads supports only one mutex attribute: the mutex kind, which
-is either !PTHREAD_MUTEX_FAST_NP! for ``fast'' mutexes,
-!PTHREAD_MUTEX_RECURSIVE_NP! for ``recursive'' mutexes,
-or !PTHREAD_MUTEX_ERRORCHECK_NP! for ``error checking'' mutexes.
-As the !NP! suffix indicates, this is a non-portable extension to the
-POSIX standard and should not be employed in portable programs.
-
-The mutex kind determines what happens if a thread attempts to lock a
-mutex it already owns with !pthread_mutex_lock!(3). If the mutex is of
-the ``fast'' kind, !pthread_mutex_lock!(3) simply suspends the calling
-thread forever.  If the mutex is of the ``error checking'' kind,
-!pthread_mutex_lock!(3) returns immediately with the error code
-!EDEADLK!.  If the mutex is of the ``recursive'' kind, the call to
-!pthread_mutex_lock!(3) returns immediately with a success return
-code. The number of times the thread owning the mutex has locked it is
-recorded in the mutex. The owning thread must call
-!pthread_mutex_unlock!(3) the same number of times before the mutex
-returns to the unlocked state.
-
-The default mutex kind is ``fast'', that is, !PTHREAD_MUTEX_FAST_NP!.
-
-!pthread_mutexattr_settype! sets the mutex kind attribute in |attr|
-to the value specified by |kind|.
-
-!pthread_mutexattr_gettype! retrieves the current value of the
-mutex kind attribute in |attr| and stores it in the location pointed
-to by |kind|.
-
-.SH "RETURN VALUE"
-!pthread_mutexattr_init!, !pthread_mutexattr_destroy! and
-!pthread_mutexattr_gettype! always return 0.
-
-!pthread_mutexattr_settype! returns 0 on success and a non-zero
-error code on error.
-
-.SH ERRORS
-
-On error, !pthread_mutexattr_settype! returns the following error code:
-.TP
-!EINVAL!
-|kind| is neither !PTHREAD_MUTEX_FAST_NP! nor !PTHREAD_MUTEX_RECURSIVE_NP!
-nor !PTHREAD_MUTEX_ERRORCHECK_NP!
-
-.SH AUTHOR
-Xavier Leroy <Xavier.Leroy@inria.fr>
-
-.SH "SEE ALSO"
-!pthread_mutex_init!(3),
-!pthread_mutex_lock!(3),
-!pthread_mutex_unlock!(3).