It is both complicated and differs from Unix to Unix variant. In Linux, for example, a system called Futex (Short for Fast Userspace Mutex) is used. In this system an atomic increment and test operation is performed on the mutex variable in user space. If the result of the operation indicates that there was no … Read more
It is possible but not necessarily simple: the problem you are trying to solve is dangerously close to setting up a distributed development environment which is not exactly what SVN is designed for. The SVN-mirror way You can use svn mirror as explained in the SVN book documentation to create a read-only mirror of your … Read more
That’s pretty easy: class Sample { private String message = null; private final Object lock = new Object(); public void newMessage(String x) { synchronized (lock) { message = x; } } public String getMessage() { synchronized (lock) { String temp = message; message = null; return temp; } } } Note that I didn’t either … Read more
Stick to pthread_cond_timedwait and use clock_gettime. For example: struct timespec ts; clock_gettime(CLOCK_REALTIME, &ts); ts.tv_sec += 10; // ten seconds while (!some_condition && ret == 0) ret = pthread_cond_timedwait(&cond, &mutex, &ts); Wrap it in a function if you wish. UPDATE: complementing the answer based on our comments. POSIX doesn’t have a single API to wait for … Read more
Unfortunately, this isn’t supported by the boost::interprocess API as-is. There are a few ways you could implement it however: If you are on a POSIX platform with support for pthread_mutexattr_setrobust_np, edit boost/interprocess/sync/posix/thread_helpers.hpp and boost/interprocess/sync/posix/interprocess_mutex.hpp to use robust mutexes, and to handle somehow the EOWNERDEAD return from pthread_mutex_lock. If you are on some other platform, you … Read more
Ideally, I’d like to be able to use AsyncTask.executeOnExecutor() with a SERIAL_EXECUTOR, but this is only available for API level 11 or above: new AsyncTask().executeOnExecutor(AsyncTask.SERIAL_EXECUTOR, params); To target the Android APIs below level 11, I ended up implementing a custom class which encapsulates an ExecutorService with a thread pool size of 1. The full code … Read more
I’ve been using SQLyog for years now. Recently they released v8.0 which includes an updated interface and two very cool features the Query Profiler and SQL Formatter. The formatter was the reason I upgraded this year. http://www.webyog.com/en/sqlyog_feature_list.php Blog post with video and animated gif of the SQL Formatter in action http://www.webyog.com/blog/2009/02/02/profile-and-format-mysql-queries-with-the-new-sqlyog-80/ A few years ago … Read more
I was just going to edit this answer, but it doesn’t seem correct. So I’ll post my own… According to the Threads for C# page, which has a lot of synchronization tutorials, AutoResetEvent cannot be used for interprocess synchronization. However, a named EventWaitHandle can be used for interprocess synchronization. In the above page, visit the … Read more
Why does this happen? This is because out and err are two different output streams. However, both of them print on console. So you do not see them as different streams. Moreover, when you do out.println(), it is not guaranteed that you will see the output on the console as soon as the statement gets … Read more
You can get the time difference in milliseconds from currentTimeMillis() and Location.getTime() in the onLocationChanged() callback. Use requestSingleUpdate() I just want to add that, if the user has a data connection they can use NTP time, which is even more accurate, as the GPS internal clock might drift and correcting it takes a while. EDIT: … Read more