Professional Multicore Programming: Design and Implementation for C++ Developers

Name

NAME

pthread_mutexattr_getprioceiling, pthread_mutexattr_setprioceiling — get and set the prioceiling attribute of the mutex attributes object (REALTIME THREADS)

SYNOPSIS

THR TPP #include <pthread.h>

        int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *
            restrict attr,   int *restrict prioceiling);
        int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr,
            int prioceiling);

DESCRIPTION

The pthread_mutexattr_getprioceiling() and pthread_mutexattr_setprioceiling() functions, respectively, shall get and set the priority ceiling attribute of a mutex attributes object pointed to by attr which was previously created by the function pthread_mutexattr_init().

The prioceiling attribute contains the priority ceiling of initialized mutexes. The values of prioceiling are within the maximum range of priorities defined by SCHED_FIFO.

The prioceiling attribute defines the priority ceiling of initialized mutexes, which is the minimum priority level at which the critical section guarded by the mutex is executed. In order to avoid priority inversion, the priority ceiling of the mutex shall be set to a priority higher than or equal to the highest priority of all the threads that may lock that mutex. The values of prioceiling are within the maximum range of priorities defined under the SCHED_FIFO scheduling policy.

RETURN VALUE

Upon successful completion, the pthread_mutexattr_getprioceiling() and pthread_mutexattr_setprioceiling() functions shall return zero; otherwise, an error number shall ...