The pthread_join() function waits for the thread specified by thread to terminate. If that thread has already terminated, then pthread_join() returns immediately. The thread specified by thread must be joinable..
Besides, what is the use of Pthread_join?
The pthread_join() function provides a simple mechanism allowing an application to wait for a thread to terminate. After the thread terminates, the application may then choose to clean up resources that were used by the thread.
Also Know, what does Pthread_create return? pthread_create Return Values. pthread_create() returns zero when the call completes successfully. Any other return value indicates that an error occurred. When any of the following conditions are detected, pthread_create() fails and returns the corresponding value.
Similarly, it is asked, is Pthread_join necessary?
Yes if thread is attachable then pthread_join is must otherwise it creates a Zombie thread. After a successful call to pthread_join(), the caller is guaranteed that the target thread has terminated. Joining with a thread that has previously been joined results in undefined behavior.
Is Pthread_join a blocking call?
pthread_join() is a blocking call, it will block the calling thread until the other thread ends. First parameter of pthread_join() is the ID of target thread.
Related Question Answers
Does Pthread_join wait?
pthread_join waits unless thread1 is already done. pthread_join() does not return (blocking the calling thread) until the thread being joined has terminated. If the thread has already terminated, then it returns straight away.How do you terminate a thread?
Modern ways to suspend/stop a thread are by using a boolean flag and Thread. interrupt() method. Using a boolean flag: We can define a boolean variable which is used for stopping/killing threads say 'exit'. Whenever we want to stop a thread, the 'exit' variable will be set to true.What is multithreading in C?
Multithreading in C. CServer Side ProgrammingProgramming. Multithreading is a specialized form of multitasking and a multitasking is the feature that allows your computer to run two or more programs concurrently. In general, there are two types of multitasking: process-based and thread-based.How do I return Pthread value?
If you want to return only status of the thread (say whether the thread completed what it intended to do) then just use pthread_exit or use a return statement to return the value from the thread function.What is Pthread_exit?
DESCRIPTION. The pthread_exit() function terminates the calling thread and makes the value value_ptr available to any successful join with the terminating thread. Any cancellation cleanup handlers that have been pushed and not yet popped are popped in the reverse order that they were pushed and then executed.What is Pthread_mutex_lock?
DESCRIPTION. The pthread_mutex_lock() function locks the specified mutex. If the mutex is already locked, the calling thread blocks until the mutex becomes available. This operation returns with the mutex in the locked state with the calling thread as its owner.What is Pthread join?
The pthread_join() function waits for the thread specified by thread to terminate. If multiple threads simultaneously try to join with the same thread, the results are undefined. If the thread calling pthread_join() is canceled, then the target thread will remain joinable (i.e., it will not be detached).How does Pthread<UNK>join work?
The pthread_join() function suspends execution of the calling thread until the target thread terminates, unless the target thread has already terminated. If status is non-NULL, the value passed to pthread_exit() by the terminated thread is stored in the location pointed to by status.What does Pthread detach do?
pthread_detach() — Detach a thread Allows storage for the thread whose thread ID is in the location thread to be reclaimed when that thread ends. This storage is reclaimed on process exit, regardless of whether the thread was detached, and may include storage for thread's return value.What is Sched_yield?
The sched_yield() function checks to see if other threads, at the same priority as that of the calling thread, are READY to run. The sched_yield() function calls the kernel function SchedYield(), and may be more portable across realtime POSIX systems. You should avoid designing programs that contain busy wait loops.Do you have to join threads?
Join() is actively hazardous in GUI apps - tend If you don't need to know, or don't care, about knowing if one thread has terminated from another thread, you don't need to join it.What is a detached thread?
Detach thread. Detaches the thread represented by the object from the calling thread, allowing them to execute independently from each other. Both threads continue without blocking nor synchronizing in any way. Note that when either one ends execution, its resources are released.What is Pthread in C?
Pthreads are a simple and effective way of creating a multi-threaded application. When a thread is created using pthread_create , both the original thread and the new thread share the same code base and the same memory – it's just like making two function calls at the same time.What is Pthread H?
Pthreads are defined as a set of C language programming types and procedure calls, implemented with a pthread. h header/include file and a thread library - though this library may be part of another library, such as libc, in some implementations.What is a Pthread_t?
Creates a new thread within a process, with attributes defined by the thread attribute object, attr, that is created by pthread_attr_init(). pthread_t is the data type used to uniquely identify a thread. It is returned by pthread_create() and used by the application in function calls that require a thread identifier.What are thread attributes?
Attributes are a way to specify behavior that is different from the default. When a thread is created with pthread_create() or when a synchronization variable is initialized, an attribute object can be specified.What is the Pthread API for creating a thread?
The POSIX thread libraries are a standards based thread API for C/C++. It allows one to spawn a new concurrent process flow. It is most effective on multi-processor or multi-core systems where the process flow can be scheduled to run on another processor thus gaining speed through parallel or distributed processing.What is Pthread_self?
pthread_self() in C The pthread_self() function is used to get the ID of the current thread. This function can uniquely identify the existing threads. But if there are multiple threads, and one thread is completed, then that id can be reused. So for all running threads, the ids are unique.What is thread in operating system?
A thread is a flow of execution through the process code, with its own program counter that keeps track of which instruction to execute next, system registers which hold its current working variables, and a stack which contains the execution history. A thread is also called a lightweight process. 
