Join and cancel pthread c portable#
Join and cancel pthread c code#

It has one parameter, a void pointer, specified when calling the

The cleanup handler is a user-defined routine. Pthread_cleanup_pop subroutine pops the topmost cleanup handlerДЇrom the stack, and optionally executes it. Stack, by the pthread_cleanup_push subroutine. The thread acts on a cancellation request.ДЄ cleanup handler is pushed onto the cleanup.The thread returns from its entry-point.They are all called in the following cases: Calling Cleanup HandlersД¬leanup handlers are specific to each thread.ДЄ thread can have several cleanup handlers cleanup handlers are stored in a

Join and cancel pthread c portable#

Implement a portable mechanism for releasing resources and restoring invariants Rc = pthread_create(&f_th, NULL, Thread, (void *)f_str) Rc = pthread_create(&e_th, NULL, Thread, (void *)e_str) Pthread_setcancelstate(o_state, &o_state) Pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &o_state) #include /* include file for sleep() */ void *Thread(void *string) #include /* include file for printf() */ void *Thread(void *string)ДЇor (i=0 i /* include file for pthreads - the 1st */ #include /* include file for pthreads - the 1st */ This is accomplished by calling the pthread_exit subroutine in the main routine after creating the two threads, and creating a loop in the Thread routine. The program displays exactly 10 messages in each language. The following example is a slightly modified version of our first multi-threaded program.

Join and cancel pthread c code#

In this case, the process return code (usually the return value of the main routine or the parameter of the exit subroutine) is 0 if the last thread was detached or 1 otherwise. If the initial thread is terminated, the process will be terminated when the last thread in it terminates. It is recommended always to use the pthread_exit subroutine to exit a thread to avoid implicitly calling the exit subroutine.Д®xiting the initial thread (for example by calling the pthread_exit subroutine from the main routine) does not terminate the process. The return value has the same role as the status parameter of the pthread_exit subroutine.

Returning from another thread implicitly calls the pthread_exit subroutine.

Returning from the initial thread implicitly calls the exit subroutine, thus terminating all the threads in the process.

The result of returning from the thread's initial routine depends on the thread: Calling the pthread_exit subroutine is similar, but not identical, to returning from the thread's initial routine.

The status parameter is saved by the library and can be further used when joining the terminated thread. The pthread_exit subroutine should be preferred, even for exiting the initial thread.Д¬alling the pthread_exit subroutine terminates the calling thread. In a multi-threaded program, the exit subroutine should only be used when the entire process needs to be terminated for example, in the case of an unrecoverable error. Similarly, a thread can exit at any time by calling the pthread_exit subroutine.Д¬alling the exit subroutine terminates the entire process, including all its threads. Read the following to learn more about terminating threads:ДЄ process can exit at any time by any thread by calling the exit subroutine. Because all threads share the same data space, a thread must perform cleanup operations at termination time cleanup handlers are provided by the threads library for this purpose. A thread can also explicitly terminate itself or terminate any other thread in the process. AIX Version 4.3 General Programming Concepts: Writing and Debugging ProgramsДЄ thread automatically terminates when it returns from its entry-point routine.