Pthread_join Error 3
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join another thread without waiting Synopsis #include
What Is Pthread_join
by being cancelled. If thread_return is not NULL, the return value of th is stored in the location pointed to pthread_join in c by thread_return. The return value of th is either the argument it gave to pthread_exit(3) , or PTHREAD_CANCELED if th was cancelled. The joined thread th must be in the joinable state: it must
Pthread_join Arguments
not have been detached using pthread_detach(3) or the PTHREAD_CREATE_DETACHED attribute to pthread_create(3) . When a joinable thread terminates, its memory resources (thread descriptor and stack) are not deallocated until another thread performs pthread_join on it. Therefore, pthread_join must be called once for each joinable thread created to avoid memory leaks. pthread_timedjoin_np is identical to pthread_join except that it will return the error ETIMEDOUT if the target thread th has pthread_join linux not exited before abstime passes. If abstime is NULL the function will wait forever and it's behaviour will therefore be identical to pthread_join. pthread_tryjoin_np is identical to pthread_join except that it will return immediately with the error EBUSY if the target thread th has not exited. At most one thread can wait for the termination of a given thread. Calling pthread_join on a thread th on which another thread is already waiting for termination returns an error. Cancellation pthread_join, pthread_tryjoin_np and pthread_timedjoin_np are cancellation points. If a thread is cancelled while suspended in either function, the thread execution resumes immediately and the cancellation is executed without waiting for the th thread to terminate. If cancellation occurs during either function, the th thread remains not joined. Return Value On success, the return value of th is stored in the location pointed to by thread_return, and 0 is returned. On error, a non-zero error code is returned. Errors ESRCH No thread could be found corresponding to that specified by th. EINVAL The th thread has been detached. EINVAL Another thread is already waiting on termination of th. ETIMEDOUT (pthread_timedjoin_np only): abstime passed before th could be joined. EDEADLK The th argument refers to the calli
top pthread_join - join with a terminated thread SYNOPSIS top #include
Pthread_join Multiple Threads Example
top The pthread_join() function waits for the thread specified by thread to terminate.
What Does Pthread_join Do
If that thread has already terminated, then pthread_join() returns immediately. The thread specified by thread must be joinable. If retval is pthread_join parameters not NULL, then pthread_join() copies the exit status of the target thread (i.e., the value that the target thread supplied to pthread_exit(3)) into the location pointed to by retval. If the target thread was canceled, https://www.sourceware.org/pthreads-win32/manual/pthread_join.html then PTHREAD_CANCELED is placed in the location pointed to by retval. 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). RETURN VALUE top On success, pthread_join() returns 0; on error, it returns an error number. ERRORS http://man7.org/linux/man-pages/man3/pthread_join.3.html top EDEADLK A deadlock was detected (e.g., two threads tried to join with each other); or thread specifies the calling thread. EINVAL thread is not a joinable thread. EINVAL Another thread is already waiting to join with this thread. ESRCH No thread with the ID thread could be found. ATTRIBUTES top For an explanation of the terms used in this section, see attributes(7). ┌───────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├───────────────┼───────────────┼─────────┤ │pthread_join() │ Thread safety │ MT-Safe │ └───────────────┴───────────────┴─────────┘ CONFORMING TO top POSIX.1-2001, POSIX.1-2008. NOTES top After a successful call to pthread_join(), the caller is guaranteed that the target thread has terminated. The caller may then choose to do any clean-up that is required after termination of the thread (e.g., freeing memory or other resources that were allocated to the target thread). Joining with a thread that has previously been joined results in undefined behavior. Failure to join with a thread that is joinable (i.e., one that is not detached), produces a "zombie thread". Avoid doing this, since each zombie thread consumes some system resources, and when enough zombie threads have accumulated, it will no longer be possible to create new threads (or process
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. If retval is https://linux.die.net/man/3/pthread_join not NULL, then pthread_join() copies the exit status of the target https://ubuntuforums.org/showthread.php?t=1812341 thread (i.e., the value that the target thread supplied to pthread_exit(3)) into the location pointed to by *retval. If the target thread was canceled, then PTHREAD_CANCELED is placed in *retval. If multiple threads simultaneously try to join with the same thread, the results are undefined. If pthread_join error the thread calling pthread_join() is canceled, then the target thread will remain joinable (i.e., it will not be detached). Return Value On success, pthread_join() returns 0; on error, it returns an error number. Errors EDEADLK A deadlock was detected (e.g., two threads tried to join with each other); or thread specifies the calling thread. EINVAL thread is pthread_join error 3 not a joinable thread. EINVAL Another thread is already waiting to join with this thread. ESRCH No thread with the ID thread could be found. Conforming to POSIX.1-2001. Notes 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. Failure to join with a thread that is joinable (i.e., one that is not detached), produces a "zombie thread". Avoid doing this, since each zombie thread consumes some system resources, and when enough zombie threads have accumulated, it will no longer be possible to create new threads (or processes). There is no pthreads analog of waitpid(-1, &status, 0), that is, "join with any terminated thread". If you believe you need this functionality, you probably need to rethink your application design. All of the threads in a process are peers: any thread can join with any other thread in the process. Example See pthread_create(3). See Also pthread_cancel(3), pthread_create(3), pthread_detach(3), pthread_exit(3), pthread_tryjoin_np(3), pthreads(7) Ref
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