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2010-02-20do not release GVL for non-blocking operations
There's no point in wasting cycles releasing and reacquiring a lock when we know we won't block. Since most non-blocking users are expected to be single/few-threaded processes, this will likely help them.
2010-02-13use GC correctly and avoid memory leaks
We still need to explicitly free the pointer we're given, and not just close the associated file descriptor. Fortunately most people to not spend all day opening/closing message queue descriptors so this leak may not be noticeable.
2010-01-09MRI 1.8 does not have rb_str_flush
It's Rubinius-specific and we use rb_str_resize there anyways...
2010-01-08no point in non-blocking for fd notifications
It's not needed since the native thread will retry in the unlikely case of EINTR/EAGAIN. And writing one byte to a pipe that's guaranteed by POSIX to be at least 512 bytes is highly unlikely. It's also bad because F_SETFL takes the big kernel lock under Linux (and possibly other systems), and doing it unnecessarily is a waste of system cycles.
2010-01-08mode_t is usually unsigned
Most used open modes are well under INT_MAX, however
2010-01-07add POSIX_MQ#shift helper method
This acts like POSIX_MQ#receive but only returns the message without the priority.
2010-01-07POSIX_MQ#notify block execution on message received
This is implementation uses both a short-lived POSIX thread and a pre-spawned Ruby Thread in a manner that works properly under both Ruby 1.8 (green threads) and 1.9 (where Ruby Threads are POSIX threads). The short-lived POSIX thread will write a single "\0" byte to a pipe the Ruby Thread waits on. This operation is atomic on all platforms. Once the Ruby Thread is woken up from the pipe, it will execute th block given to it. This dual-thread implementation is inspired by the way glibc implements mq_notify(3) + SIGEV_THREAD under Linux where the kernel itself cannot directly spawn POSIX threads.
2010-01-02fix warnings on platforms where mqd_t != int
The POSIX manpages specify the return values of all mq_* functions besides mq_open(3) to be "int", not "mqd_t".
2010-01-02support POSIX_MQ#to_io under FreeBSD
FreeBSD implements an __mq_oshandle(mqd_t mqd) function to convert mqd_t to integer file descriptors.
2010-01-02fix build under FreeBSD 7.2
FreeBSD seems to need some files explicitly included.
2010-01-02Fix mq.notify = nil to unregister notifications
"mq.notify = false" also works now, doing what "mq.notify = nil" used to do (using SIGEV_NONE). I was confused by SIGEV_NONE usage vs using a NULL pointer for the notification passed mq_notify(3). SIGEV_NONE does not actually unregister, it registers a no-op notification which prevents other processes from taking us. This also fixes the test case to pass under both Linux and FreeBSD.
2010-01-02initial commit v0.1.0