System Calls _lwp_cond_signal(2)
_lwp_cond_signal, _lwp_cond_broadcast - signal a condition
int _lwp_cond_signal(lwp_cond_t *cvp);
int _lwp_cond_broadcast(lwp_cond_t *cvp);
The _lwp_cond_signal() function unblocks one LWP that is
blocked on the LWP condition variable pointed to by cvp.
The _lwp_cond_broadcast() function unblocks all LWPs that
are blocked on the LWP condition variable pointed to by cvp.
If no LWPs are blocked on the LWP condition variable, then
_lwp_cond_signal() and _lwp_cond_broadcast() have no effect.
Both functions should be called under the protection of the
same LWP mutex lock that is used with the LWP condition
variable being signaled. Otherwise, the condition variable
may be signalled between the test of the associated condi-
tion and blocking in _lwp_cond_wait(). This can cause an
Upon successful completion, 0 is returned. A non-zero value
indicates an error.
The _lwp_cond_signal() and _lwp_cond_broadcast() functions
will fail if:
The cvp argument points to an invalid LWP condition
The cvp argument points to an invalid address.
SunOS 5.9 Last change: 8 Dec 1995 1