12-14-2008
how to wake up a thread that blocking at epoll_wait?
I have two threads: one maintains a thread-safe message queue (handle this queue at the beginning of every loop) and deals with tcp connections, the other one posts message to the former one. the problem is, while the former one was blocking at epoll_wait, it's not sure that how long until the posted message be handled. So I want to wakeup the blocking thread when posting message to it.
Any suggestion?
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LEARN ABOUT HPUX
mq_setattr
mq_setattr(2) System Calls Manual mq_setattr(2)
NAME
mq_setattr - set the blocking status of a message queue associated with a descriptor
SYNOPSIS
DESCRIPTION
The system call changes the blocking status of a message queue associated with the descriptor, mqdes. The blocking status that is modified
is per message queue descriptor and another open descriptor for the same message queue can have a different blocking status.
The argument mqstat, points to an structure that specifies the blocking status desired. More specifically, if the bit in the mq_flags field
of the structure is set, the descriptor is marked as non-blocking. Otherwise it is marked as blocking.
If omstat is non-NULL, will store in the structure referenced by omqstat, the previous message queue attributes and the queue blocking sta-
tus associated with this mqdes. The values returned are the same as would be returned by a call to
To use this function, link in the realtime library by specifying on the compiler or linker command line.
RETURN VALUE
returns the following values:
Successful completion.
Failure.
is set to indicate the error.
ERRORS
If fails, is set to one of the following values:
[EBADF] mqdes is not a valid message queue descriptor.
[EINVAL] mqstat does not point to a valid structure, or omqstat is non-NULL and does not point to a valid structure.
[ENOSYS] is not supported by the implementation.
SEE ALSO
mq_getattr(2), mq_open(2).
STANDARDS CONFORMANCE
mq_setattr(2)