For details of in-depth Linux/UNIX system programming training courses that I teach, look here. ENOMEM - The limit on the number of simultaneously held mutexes has been exceeded. IEEE/The Open Group 2017 PTHREADMUTEXINIT (3P) HTML rendering created by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project.ENOTRECOVERABLE - The mutex you are trying to acquire is protecting state left irrecoverable by the mutexвЂ™s previous owner that failed while holding the lock.Threading 1Step Processes For Multiple Clients. Revise thrtest3.cso that it uses a mutex to fix the race condition. There are two ways to initialize a mutex variable: Statically, when it is declared. If the owner that acquired the lock with EOWNERDEAD fails, the next owner acquires the lock with EOWNERDEAD. For dynamic initialization use pthreadmutexinit. Mutex variables must be declared with type pthreadmutext, and must be initialized before they can be used. Subsequent calls to pthread_mutex_lock() fail to acquire the mutex and return an ENOTRECOVERABLE error code. If the caller is unable to make the state consistent, do not call pthread_mutex_init() for the mutex. Subsequent calls to pthread_mutex_lock() behave normally. If attr is specified as NULL, all attributes are set to the default mutex attributes for the newly created mutex. The new mutex may be used immediately for serializing critical resources. If the caller is able to make the state consistent, call pthread_mutex_consistent_np() for the mutex and unlock the mutex. The pthreadmutexinit () function initializes a mutex with the specified attributes for use. The caller must attempt to make the state protected by the mutex consistent. EOWNERDEAD - The last owner of this mutex failed while holding the mutex.EDEADLK - The current thread already owns the mutex.EAGAIN - The mutex could not be acquired because the maximum number of recursive locks for mutex has been exceeded.When any of the following conditions occurs, the function fails and returns the corresponding value. Any other return value indicates that an error occurred. Pthread_mutex_lock() returns zero after completing successfully.

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