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Set a mutex's scheduling protocol
#include <pthread.h>
int pthread_mutexattr_setprotocol(
pthread_mutexattr * attr,
int protocol );
- attr
- A pointer to the pthread_mutexattr_t object that you
want to set the attribute in.
- protocol
- The new value of the scheduling protocol; one of:
- PTHREAD_PRIO_INHERIT — when a thread is blocking
higher-priority threads by locking one or more mutexes with this
attribute, raise the thread's priority to that of the highest
priority thread waiting on the PTHREAD_PRIO_INHERIT mutex.
- PTHREAD_PRIO_PROTECT — execute the thread at
the highest priority or priority ceilings of all
the mutexes owned by the thread and initialized with
PTHREAD_PRIO_PROTECT, whether other threads are blocked
or not.
|
The POSIX protocol of PTHREAD_PRIO_NONE isn't currently
supported.
|
libc
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.
- EOK
- Success.
- ENOTSUP
- The protocol argument is an unsupported or an invalid value.
POSIX 1003.1 THR TPP|TPI
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
pthread_mutexattr_getprotocol(),
pthread_mutexattr_getrecursive()
“Mutexes: mutual exclusion locks”
in the QNX Neutrino Microkernel chapter of the
System Architecture guide
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