pthread

I further tested this simple Pthread code on the PPE to see how it scales with an increasing number of threads.

As you can see, pthread_mutex_init accepts a pointer to an already-allocated region of memory to initialize as a mutex.

In other words, the system allocates at least 10MB of private storage for each pthread.

This sounds a bit confusing, but the pthread example below will clarify how condition variables work.

Thus, PTHREAD_PROCESS_SHARED and interprocess POSIX synchronization primitives can be implemented and are now available.

pthread -qthreaded or _r invocation mode Creates programs running in a multithreaded environment.

In Linux, pthread_cond_signal wakes up a thread waiting on a conditional variable.

Futex (fast user space mutex) is done by the kernel on the thread ID upon pthread_join (for more on futex, please see Resources).

POSIX provides locking and synchronization support through the pthread_mutex data type.

In Linux, the pthread_cancel method terminates execution of the thread identified by the specified threadId.

Note that you've invoked pthread_cond_broadcast after releasing the mutex.

If the list were originally empty, you call pthread_cond_broadcast to post push data into the list.

In libspe2, the operation is synchronous, so if you want to run a thread in the background, you have to make your own pthread calls.

A POSIX API for creating a pthread_mutex lets the mutex implement the priority-inheritance protocol.

If you need to block the calling thread for a specific time, then use the pthread_cond_timewait to block the thread.

pthread_mutexes can be created with different locking policies.

pthread_rwlock_rdlock may fail if the maximum number of read locks (implementation defined) for the lock has been exceeded.

This careful Pthread scheduling leads to much more deterministic and repeatable test runs.

Table 1 above displays the pthread condition variable for synchronization between threads.

You can further optimize this situation by using pthread_mutex_timedlock API, if your system supports it (see Resources).

Instead of providing an abstraction of logical SPUs, this interface is thread-oriented and behaves in a similar way to the pthread library.

The linker complained of some missing pthreads-related exports.

Otherwise, it can be created statically when it is declared by a pthread_mutex_t variable.

Meanwhile, you can use pthread_xxxx calls at any time after the thread has been created.

Linux pthread mutexes are supported by fast user-space mutexes, known as futexes.

Immediately after unlocking the mutex, thread 2 calls the function pthread_cond_broadcast(&mycond).

With this background, let's look at the function pthread_cond_timedwait, which you use for the second check.

While still holding the mutex lock, our thread will call pthread_cond_wait(&mycond, &mymutex).

Take care to invoke pthread_rwlock_unlock n times if there are n concurrent read locks for the lock.

The POSIX lock type is a pthread_mutex.

If the reader thread is awakened before the timeout, the return value from pthread_cond_timedwait will be 0.

As a second argument, it can also accept an optional pthread_mutexattr_t pointer.

A note on Pthreads scheduling and compiler optimization