- #How to index the data using pthread c how to#
- #How to index the data using pthread c software#
- #How to index the data using pthread c code#
End-User application software generally has different threads doing different things. In today's environment, there are many instances of multiple threads. Technically, you can't.at least not directly.Ī thread is an execution path that the processor is following as it runs your program.
#How to index the data using pthread c code#
The only thing that won't compile in c code is the output because the tutorial is written in c++ and uses the iostream library to output.ALL the thread creations, passing arguments, and so on are fully valid in c code. I have found this tutorial for multithreading. Just be careful with passing pointers, because it can lead to a lot of problems. Pthread_create(&my_thread, NULL, thread_func, &a) // no parentheses here Pthread_exit(NULL) // you could also return NULL here to exit no difference Printf("Passes argument: %d\n", *(int*)argument)
After that initialize it, and wait to finish work. You should first create a function which accepts a void* as an argument and returns a void*.
#How to index the data using pthread c how to#
In Java, the answer is as set out here: How to call a method with a separate thread in Java? Not enough virtual memory is available in this process to create a new key.How can I call a function in a separate thread using pthreads? When any of the following conditions occur, pthread_keycreate() fails and returns the corresponding value. Any other returned value indicates that an error occurred. Returns zero after completing successfully. The order in which the destructor functions are called is unspecified. When a key has a non- NULL destructor function and the thread has a non- NULL value associated with that key, the destructor function is called with the current associated value when the thread exits. The caller must ensure that the storage and access to this key are properly synchronized.Īn optional destructor function, destructor, can be used to free stale storage. When pthread_key_create() returns successfully, the allocated key is stored in the location pointed to by key. Ret = pthread_key_create(& key, destructor) Int pthread_key_create(pthread_key_t * key, The per-thread binding is deallocated when a thread terminates if the key was created with a destructor function. The values are specific to the thread and are maintained for each thread independently. Once a key has been created, each thread can bind a value to the key. The key is global to all threads in the process, and all threads initially have the value NULL associated with the key when it is created.Ĭall pthread_key_create() is once for each key before using the key.
Use pthread_key_create(3THR) to allocate a key that is used to identify thread-specific data in a process. Using the key, a thread can access a pointer ( void *) that is maintained per-thread. Each thread-specific data item is associated with a key that is global to all threads in the process.
TSD is the only way to define and refer to data that is private to a thread. Thread-specific data is maintained on a per-thread basis. This is very much like global data, except that it is private to a thread. For multithreaded C programs a third class is added- thread-specific data (TSD). Single-threaded C programs have two basic classes of data-local data and global data.