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-.\"	$Darwin$
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-.\" Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
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-.\" are subject to the Apple Public Source License Version 1.1 (the
-.\" "License").  You may not use this file except in compliance with the
-.\" License.  Please obtain a copy of the License at
-.\" http://www.apple.com/publicsource and read it before using this file.
-.\" 
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-.Dd June 8, 2000
-.Dt SEM_WAIT 2
-.Os Darwin
-.Sh NAME
-.Nm sem_wait, sem_trywait
-.Nd lock a semaphore
-.Sh SYNOPSIS
-.Fd #include <semaphore.h>
-.Ft int
-.Fn sem_wait "sem_t *sem"
-.Ft int
-.Fn sem_trywait "sem_t *sem"
-.Sh DESCRIPTION
-The semaphore referenced by
-.Fa sem
-is locked.  When calling
-.Fn sem_wait ,
-if the semaphore's value is zero, the calling thread will block until
-the lock is aquired or until the call is interrupted by a
-signal. Alternatively, the
-.Fn sem_trywait
-function will fail if the semaphore is already locked, rather than
-blocking on the semaphore.
-.Pp
-If successful (the lock was aquired),
-.Fn sem_wait
-and
-.Fn sem_trywait
-will return 0.  Otherwise, -1 is returned and
-.Va errno
-is set, and the state of the semaphore is unchanged.
-.Sh ERRORS
-.Fn sem_wait
-and
-.Fn sem_trywait
-succeed unless:
-.Bl -tag -width Er
-.It Bq Er EAGAIN
-The semaphore is already locked.
-.It Bq Er EINVAL
-.Fa sem
-is not a valid semaphore descriptor.
-.It Bq Er EDEADLK
-A deadlock was detected.
-.It Bq Er EINTR
-The call was interrupted by a signal.
-.El
-.Sh NOTES
-Applications may encounter a priority inversion while using
-semaphores.  When a thread is waiting on a semaphore which is about to
-be posted by a lower-priority thread and the lower-priority thread is
-preempted by another thread (of medium priority), a priority inversion
-has occured, and the higher-priority thread will be blocked for an
-unlimited time period.  Programmers using the realtime functionality
-of the system should take care to avoid priority inversions.
-.Sh SEE ALSO
-.Xr semctl 2 ,
-.Xr semget 2 ,
-.Xr semop 2 ,
-.Xr sem_open 2 ,
-.Xr sem_post 2
-.Sh HISTORY
-.Fn sem_wait
-and
-.Fn sem_trywait
-are specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995).