Class
Use the Monitor class when you want to have a lock object for blocks with mutual exclusion.
require 'monitor' lock = Monitor.new lock.synchronize do # exclusive access end
Instance Methods
ext/monitor/monitor.c
View on GitHub
static VALUE
monitor_enter(VALUE monitor)
{
struct rb_monitor *mc = monitor_ptr(monitor);
if (!mc_owner_p(mc)) {
rb_mutex_lock(mc->mutex);
RB_OBJ_WRITE(monitor, &mc->owner, rb_fiber_current());
mc->count = 0;
}
mc->count++;
return Qnil;
}
Enters exclusive section.
ext/monitor/monitor.c
View on GitHub
static VALUE
monitor_exit(VALUE monitor)
{
monitor_check_owner(monitor);
struct rb_monitor *mc = monitor_ptr(monitor);
if (mc->count <= 0) rb_bug("monitor_exit: count:%d", (int)mc->count);
mc->count--;
if (mc->count == 0) {
RB_OBJ_WRITE(monitor, &mc->owner, Qnil);
rb_mutex_unlock(mc->mutex);
}
return Qnil;
}
Leaves exclusive section.
#
ext/monitor/lib/monitor.rb
View on GitHub
# File tmp/rubies/ruby-3.4.1/ext/monitor/lib/monitor.rb, line 263
def new_cond
::MonitorMixin::ConditionVariable.new(self)
end
Creates a new MonitorMixin::ConditionVariable associated with the Monitor object.
ext/monitor/monitor.c
View on GitHub
static VALUE
monitor_synchronize(VALUE monitor)
{
monitor_enter(monitor);
return rb_ensure(monitor_sync_body, monitor, monitor_sync_ensure, monitor);
}
Enters exclusive section and executes the block. Leaves the exclusive section automatically when the block exits. See example under MonitorMixin.
ext/monitor/monitor.c
View on GitHub
static VALUE
monitor_try_enter(VALUE monitor)
{
struct rb_monitor *mc = monitor_ptr(monitor);
if (!mc_owner_p(mc)) {
if (!rb_mutex_trylock(mc->mutex)) {
return Qfalse;
}
RB_OBJ_WRITE(monitor, &mc->owner, rb_fiber_current());
mc->count = 0;
}
mc->count += 1;
return Qtrue;
}
Attempts to enter exclusive section. Returns false if lock fails.