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25.\" $FreeBSD: src/share/man/man3/pthread_mutex_timedlock.3,v 1.6 2007/10/22 10:08:00 ru Exp $
26.\"
27.Dd July 10, 2009
28.Dt PTHREAD_MUTEX_TIMEDLOCK 3
29.Os
30.Sh NAME
31.Nm pthread_mutex_timedlock
32.Nd lock a mutex without blocking indefinitely
33.Sh LIBRARY
34.Lb libpthread
35.Sh SYNOPSIS
36.In pthread.h
37.In time.h
38.Ft int
39.Fn pthread_mutex_timedlock "pthread_mutex_t *mutex" "const struct timespec *abs_timeout"
40.Sh DESCRIPTION
41The
42.Fn pthread_mutex_timedlock
43function will lock
44.Fa mutex .
45If it is already locked the calling thread will block until
46the mutex becomes available or
47the timeout,
48specified by abs_timeout,
49expires.
50The time of the timeout is an absolute time and
51is not relative to the current time.
52.Sh RETURN VALUES
53If successful,
54.Fn pthread_mutex_timedlock
55will return zero, otherwise an error number will be returned to
56indicate the error.
57.Sh ERRORS
58The
59.Fn pthread_mutex_timedlock
60function will fail if:
61.Bl -tag -width Er
62.It Bq Er EINVAL
63The
64.Fa mutex
65was created with the protocol attribute having the
66value PTHREAD_PRIO_PROTECT and
67the calling thread's priority is higher than the
68mutex's current priority ceiling.
69.It Bq Er EINVAL
70The process or thread would have blocked, and
71.Fa abs_timeout
72specified a nanosecond value less than zero or
73greater than or equal to 1 billion.
74.It Bq Er EINVAL
75The
76.Fa mutex
77parameter is invalid.
78.It Bq Er ETIMEDOUT
79The
80.Fa mutex
81could not be locked before the timeout expired.
82.It Bq Er EAGAIN
83The
84.Fa mutex
85could not be acquired because the
86maximum number of recursive locks for the
87.Fa mutex
88has been exceeded.
89.It Bq Er EDEADLK
90The current thread already owns the
91.Fa mutex .
92.El
93.Sh SEE ALSO
94.Xr pthread_mutex_destroy 3 ,
95.Xr pthread_mutex_init 3 ,
96.Xr pthread_mutex_lock 3 ,
97.Xr pthread_mutex_trylock 3 ,
98.Xr pthread_mutex_unlock 3
99.Sh STANDARDS
100The
101.Fn pthread_mutex_timedlock
102function is expected to conform to
103.St -p1003.1-96 .
104