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30 .Dd July 28, 1998
31 .Dt PTHREAD_COND_SIGNAL 3
32 .Os
33 .Sh NAME
34 .Nm pthread_cond_signal
35 .Nd unblock a thread waiting for a condition variable
36 .Sh SYNOPSIS
37 .In pthread.h
38 .Ft int
39 .Fn pthread_cond_signal "pthread_cond_t *cond"
40 .Sh DESCRIPTION
41 The
42 .Fn pthread_cond_signal
43 function unblocks one thread waiting for the condition variable
44 .Fa cond .
45 .Sh RETURN VALUES
46 If successful, the
47 .Fn pthread_cond_signal
48 function will return zero, otherwise an error number will be returned
49 to indicate the error.
50 .Sh ERRORS
51 The
52 .Fn pthread_cond_signal
53 function will fail if:
54 .Bl -tag -width Er
55 .It Bq Er EINVAL
56 The value specified by
57 .Fa cond
58 is invalid.
59 .El
60 .Sh SEE ALSO
61 .Xr pthread_cond_broadcast 3 ,
62 .Xr pthread_cond_destroy 3 ,
63 .Xr pthread_cond_init 3 ,
64 .Xr pthread_cond_timedwait 3 ,
65 .Xr pthread_cond_wait 3
66 .Sh STANDARDS
67 The
68 .Fn pthread_cond_signal
69 function conforms to
70 .St -p1003.1-96 .