Class: POSIX::Mqueue
- Inherits:
-
Object
- Object
- POSIX::Mqueue
- Defined in:
- lib/posix/mqueue/version.rb,
ext/posix/mqueue.c
Defined Under Namespace
Classes: QueueEmpty, QueueFull
Constant Summary collapse
- VERSION =
"0.0.8"
Instance Method Summary collapse
- #initialize(*args) ⇒ Object constructor
- #msgsize ⇒ Object
- #receive ⇒ Object
- #send(message) ⇒ Object
- #size ⇒ Object
- #timedreceive(args) ⇒ Object
- #timedsend(args) ⇒ Object
- #to_io ⇒ Object
- #unlink ⇒ Object
Constructor Details
#initialize(*args) ⇒ Object
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# File 'ext/posix/mqueue.c', line 275
VALUE posix_mqueue_initialize(int argc, VALUE* argv, VALUE self)
{
if(argc < 1)
{
rb_raise(rb_eArgError, "initialize requires at least one argument");
}
VALUE queue = argv[0];
if (!RB_TYPE_P(queue, T_STRING)) {
rb_raise(rb_eTypeError, "Queue name must be a string");
}
VALUE options;
if (argc < 2)
{
options = rb_hash_new();
}
else
{
options = argv[1];
}
int msgsize = FIX2INT(rb_hash_lookup2(options, ID2SYM(rb_intern("msgsize")), INT2FIX(4096)));
int maxmsg = FIX2INT(rb_hash_lookup2(options, ID2SYM(rb_intern("maxmsg")), INT2FIX(10)));
struct mq_attr attr = {
.mq_flags = 0, // Flags, 0 or O_NONBLOCK
.mq_maxmsg = maxmsg, // Max messages in queue
.mq_msgsize = msgsize, // Max message size (bytes)
.mq_curmsgs = 0 // # currently in queue
};
mqueue_t* data;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (data->fd != -1) {
// This would cause a memleak otherwise
rb_raise(rb_eRuntimeError, "Illegal reinitialization");
}
data->attr = attr;
data->queue_len = RSTRING_LEN(queue);
data->queue = ruby_strdup(StringValueCStr(queue));
data->fd = mq_open(data->queue, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR, &data->attr);
if (data->fd == (mqd_t)-1) {
rb_sys_fail("Failed opening the message queue, please consult mq_open(3)");
}
VALUE args[1];
args[0] = INT2FIX(data->fd);
data->io = rb_class_new_instance(1, args, rb_path2class("IO"));
return self;
}
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Instance Method Details
#msgsize ⇒ Object
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# File 'ext/posix/mqueue.c', line 227
VALUE posix_mqueue_msgsize(VALUE self)
{
mqueue_t* data;
struct mq_attr queue;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (mq_getattr(data->fd, &queue) < 0) {
rb_sys_fail("Failed reading queue attributes, please consult mq_getattr(3)");
}
return INT2FIX(queue.mq_msgsize);
}
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#receive ⇒ Object
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# File 'ext/posix/mqueue.c', line 241
VALUE posix_mqueue_receive(VALUE self)
{
int err;
size_t buf_size;
char *buf;
VALUE str;
mqueue_t* data;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
buf_size = data->attr.mq_msgsize + 1;
// Make sure the buffer is capable
buf = (char*)malloc(buf_size);
rb_thread_wait_fd(data->fd);
err = mq_receive(data->fd, buf, buf_size, NULL);
if(err < 0 && errno == EINTR) {
err = mq_receive(data->fd, buf, buf_size, NULL);
}
if (err < 0) {
rb_sys_fail("Message retrieval failed, please consult mq_receive(3)");
}
str = rb_str_new(buf, err);
free(buf);
return str;
}
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#send(message) ⇒ Object
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# File 'ext/posix/mqueue.c', line 87
VALUE posix_mqueue_send(VALUE self, VALUE message)
{
int err;
mqueue_t* data;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (!RB_TYPE_P(message, T_STRING)) {
rb_raise(rb_eTypeError, "Message must be a string");
}
rb_io_wait_writable(data->fd);
// TODO: Custom priority
err = mq_send(data->fd, RSTRING_PTR(message), RSTRING_LEN(message), 10);
if(err < 0 && errno == EINTR) {
err = mq_send(data->fd, RSTRING_PTR(message), RSTRING_LEN(message), 10);
}
if (err < 0) {
rb_sys_fail("Message sending failed, please consult mq_send(3)");
}
return Qtrue;
}
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#size ⇒ Object
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# File 'ext/posix/mqueue.c', line 205
VALUE posix_mqueue_size(VALUE self)
{
mqueue_t* data;
struct mq_attr queue;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (mq_getattr(data->fd, &queue) < 0) {
rb_sys_fail("Failed reading queue attributes, please consult mq_getattr(3)");
}
return INT2FIX(queue.mq_curmsgs);
}
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#timedreceive(args) ⇒ Object
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# File 'ext/posix/mqueue.c', line 114
VALUE posix_mqueue_timedreceive(VALUE self, VALUE args)
{
int err;
mqueue_t* data;
size_t buf_size;
char *buf;
struct timespec timeout;
VALUE str;
VALUE seconds = rb_ary_entry(args, 0);
VALUE nanoseconds = rb_ary_entry(args, 1);
if (seconds == Qnil) seconds = INT2FIX(0);
if (nanoseconds == Qnil) nanoseconds = INT2FIX(0);
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (!RB_TYPE_P(seconds, T_FIXNUM)) {
rb_raise(rb_eTypeError, "First argument must be a Fixnum");
}
if (!RB_TYPE_P(nanoseconds, T_FIXNUM)) {
rb_raise(rb_eTypeError, "Second argument must be a Fixnum");
}
timeout.tv_sec = FIX2ULONG(seconds);
timeout.tv_nsec = FIX2ULONG(nanoseconds);
buf_size = data->attr.mq_msgsize + 1;
// Make sure the buffer is capable
buf = (char*)malloc(buf_size);
// TODO: Specify priority
err = mq_timedreceive(data->fd, buf, buf_size, NULL, &timeout);
if (err < 0) {
if(errno == 110) {
rb_raise(rb_cQueueEmpty, "Queue empty");
} else {
rb_sys_fail("Message sending failed, please consult mq_send(3)");
}
}
str = rb_str_new(buf, err);
free(buf);
return str;
}
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#timedsend(args) ⇒ Object
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# File 'ext/posix/mqueue.c', line 163
VALUE posix_mqueue_timedsend(VALUE self, VALUE args)
{
int err;
mqueue_t* data;
struct timespec timeout;
VALUE message = rb_ary_entry(args, 0);
VALUE seconds = rb_ary_entry(args, 1);
VALUE nanoseconds = rb_ary_entry(args, 2);
if (seconds == Qnil) seconds = INT2FIX(0);
if (nanoseconds == Qnil) nanoseconds = INT2FIX(0);
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (!RB_TYPE_P(message, T_STRING)) {
rb_raise(rb_eTypeError, "Message must be a string");
}
if (!RB_TYPE_P(seconds, T_FIXNUM)) {
rb_raise(rb_eTypeError, "First argument must be a Fixnum");
}
if (!RB_TYPE_P(nanoseconds, T_FIXNUM)) {
rb_raise(rb_eTypeError, "Second argument must be a Fixnum");
}
timeout.tv_sec = FIX2ULONG(seconds);
timeout.tv_nsec = FIX2ULONG(nanoseconds);
err = mq_timedsend(data->fd, RSTRING_PTR(message), RSTRING_LEN(message), 10, &timeout);
if (err < 0) {
if(errno == 110) {
rb_raise(rb_cQueueFull, "Queue full, most likely you want to bump /proc/sys/fs/mqueue/msg_max from the default maximum queue size of 10.");
} else {
rb_sys_fail("Message sending failed, please consult mq_send(3)");
}
}
return Qtrue;
}
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#to_io ⇒ Object
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# File 'ext/posix/mqueue.c', line 219
VALUE posix_mqueue_to_io(VALUE self)
{
mqueue_t* data;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
return data->io;
}
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#unlink ⇒ Object
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# File 'ext/posix/mqueue.c', line 74
VALUE posix_mqueue_unlink(VALUE self)
{
mqueue_t* data;
TypedData_Get_Struct(self, mqueue_t, &mqueue_type, data);
if (mq_unlink(data->queue) == -1) {
rb_sys_fail("Message queue unlinking failed, please consume mq_unlink(3)");
}
return Qtrue;
}
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