pthread_mutex_lock man page on DigitalUNIX

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pthread_mutex_lock(3)					 pthread_mutex_lock(3)

       pthread_mutex_lock - Locks an unlocked mutex

       #include <pthread.h>

       int pthread_mutex_lock(
	       pthread_mutex_t *mutex );

       DECthreads POSIX 1003.1c Library (

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

       Mutex to be locked.

       This routine locks a mutex with behavior that depends upon the type  of
       mutex,  as  follows: If a normal or default mutex is specified, a dead‐
       lock can result if the current owner of the mutex calls this routine in
       an  attempt  to	lock  the  mutex  a  second time. (The deadlock is not
       detected or reported.)  If a recursive mutex is specified, the  current
       owner of the mutex can relock the same mutex without blocking. The lock
       count is incremented for each recursive lock within the thread.	If  an
       errorcheck  mutex  is specified and the current owner tries to lock the
       mutex a second time, this routine reports the [EDEADLK] error.  If  the
       mutex  is  locked  by  another thread, the calling thread waits for the
       mutex to become available.

       Use the pthread_mutexattr_settype(3) routine to set  the	 type  of  the
       mutex  to  normal, default, recursive, or errorcheck. For more informa‐
       tion about types of mutexes,  see  the  description  of	pthread_mutex‐

       The  thread  that  has  locked  a  mutex	 becomes its current owner and
       remains its owner until the same thread has unlocked it.	 This  routine
       returns	with the mutex in the locked state and with the current thread
       as the mutex's current owner.

       A recursive or errorcheck mutex records the identity of the thread that
       locks  it,  allowing  debuggers	to  display  this information. In most
       cases, normal and default mutexes do not	 record	 the  owning  thread's

       If  an  error  condition	 occurs, this routine returns an integer value
       indicating the type of error. Possible return values  are  as  follows:
       Successful  completion.	 A  deadlock condition is detected.  The value
       specified by mutex is not a valid mutex.


       Functions:   pthread_mutexattr_settype(3),    pthread_mutex_destroy(3),
       pthread_mutex_init(3),			     pthread_mutex_trylock(3),

       Manuals: Guide to DECthreads and Programmer's Guide


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