Set a mutex's scheduling protocol
#include <pthread.h> int pthread_mutexattr_setprotocol( pthread_mutexattr * attr, int protocol );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The pthread_mutexattr_setprotocol() function sets the mutex attribute attr's scheduling protocol to protocol. The structure pointed to by attr must have been previously created with pthread_mutexattr_init().
The protocol attribute defines the protocol for using mutexes. A thread holding a PTHREAD_PRIO_INHERIT mutex won't be moved to the tail of the scheduling queue if its original priority is changed (by a call to pthread_schedsetparam(), for example). This remains true if the thread unlocks the PTHREAD_PRIO_INHERIT mutex.
POSIX 1003.1 THR TPP|TPI
“Mutexes: mutual exclusion locks” in the QNX Neutrino Microkernel chapter of the System Architecture guide