pthreads/pthread_cond_timedwait.3

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  30 .Dd July 28, 1998
  31 .Dt PTHREAD_COND_TIMEDWAIT 3
  32 .Os
  33 .Sh NAME
  34 .Nm pthread_cond_timedwait
  35 .Nd "wait on a condition variable for a specific amount of time"
  36 .Sh SYNOPSIS
  37 .Fd #include <pthread.h>
  38 .Ft int
  39 .Fo pthread_cond_timedwait
  40 .Fa "pthread_cond_t *restrict cond"
  41 .Fa "pthread_mutex_t *restrict mutex"
  42 .Fa "const struct timespec *restrict abstime"
  43 .Fc
  44 .Sh DESCRIPTION
  45 The
  46 .Fn pthread_cond_timedwait
  47 function atomically blocks the current thread waiting on the condition
  48 variable specified by
  49 .Fa cond
  50 and unblocks the mutex specified by
  51 .Fa mutex .
  52 The waiting thread unblocks only after another thread calls
  53 .Xr pthread_cond_signal 3 ,
  54 or
  55 .Xr pthread_cond_broadcast 3
  56 with the same condition variable, or if the system time reaches the
  57 time specified in
  58 .Fa abstime ,
  59 and the current thread reacquires the lock on
  60 .Fa mutex .
  61 .Sh RETURN VALUES
  62 If successful, the
  63 .Fn pthread_cond_timedwait
  64 function will return zero.
  65 Otherwise, an error number will be returned to
  66 indicate the error.
  67 .Sh ERRORS
  68 .Fn pthread_cond_timedwait
  69 will fail if:
  70 .Bl -tag -width Er
  71 .It Bq Er EINVAL
  72 The value specified by
  73 .Fa cond ,
  74 .Fa mutex
  75 or
  76 .Fa abstime
  77 is invalid.
  78 .It Bq Er ETIMEDOUT
  79 The system time has reached or exceeded the time specified in
  80 .Fa abstime .
  81 .El
  82 .Sh SEE ALSO
  83 .Xr pthread_cond_broadcast 3 ,
  84 .Xr pthread_cond_destroy 3 ,
  85 .Xr pthread_cond_init 3 ,
  86 .Xr pthread_cond_signal 3 ,
  87 .Xr pthread_cond_wait 3
  88 .Sh STANDARDS
  89 .Fn pthread_cond_timedwait
  90 conforms to
  91 .St -p1003.1-96 .